[Bug 1932305] [NEW] fstrim doesn't trim my /home separate partition

[Francisco T.]

Public bug reported:

My system is Kubuntu 20.04

I have 3 partitions in my nvme:
NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
nvme0n1     259:0    0 465,8G  0 disk 
├─nvme0n1p1 259:1    0   251M  0 part /boot/efi
├─nvme0n1p2 259:2    0  53,7G  0 part /
├─nvme0n1p4 259:3    0   7,6G  0 part [SWAP]
└─nvme0n1p5 259:4    0   357G  0 part /home


I have activated fstrim.service and fstrim.timer:
sudo systemctl list-timers
...
Mon 2021-06-21 00:00:00 CEST 3 days left   Mon 2021-06-14 00:00:03 CEST 3 days ago   fstrim.timer                 fstrim.service  


But home partition is not trimmed:
...
jun 14 00:00:10 moon fstrim[5137]: /: 29,1 GiB (31264600064 bytes) trimmed on /dev/nvme0n1p2
jun 14 00:00:10 moon fstrim[5137]: /boot/efi: 239,1 MiB (250755584 bytes) trimmed on /dev/nvme0n1p1
jun 14 00:00:10 moon systemd[1]: fstrim.service: Succeeded.
...


The fstrim.service is Protected for home:
sudo systemctl cat fstrim.service 
# /lib/systemd/system/fstrim.service
[Unit]
Description=Discard unused blocks on filesystems from /etc/fstab
Documentation=man:fstrim(8)
ConditionVirtualization=!container

[Service]
Type=oneshot
ExecStart=/sbin/fstrim --fstab --verbose --quiet
ProtectSystem=strict
ProtectHome=yes
PrivateDevices=no
PrivateNetwork=yes
PrivateUsers=no
ProtectKernelTunables=yes
ProtectKernelModules=yes
ProtectControlGroups=yes
MemoryDenyWriteExecute=yes
SystemCallFilter=@default @file-system @basic-io @system-service


I think the problem is:
https://github.com/karelzak/util-linux/commit/61b384b36105fe682ddf16b9379f446d935603bc

** Affects: util-linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1932305

Title:
  fstrim doesn't trim my /home separate partition

Status in util-linux package in Ubuntu:
  New

Bug description:
  My system is Kubuntu 20.04

  I have 3 partitions in my nvme:
  NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
  nvme0n1     259:0    0 465,8G  0 disk 
  ├─nvme0n1p1 259:1    0   251M  0 part /boot/efi
  ├─nvme0n1p2 259:2    0  53,7G  0 part /
  ├─nvme0n1p4 259:3    0   7,6G  0 part [SWAP]
  └─nvme0n1p5 259:4    0   357G  0 part /home


  I have activated fstrim.service and fstrim.timer:
  sudo systemctl list-timers
  ...
  Mon 2021-06-21 00:00:00 CEST 3 days left   Mon 2021-06-14 00:00:03 CEST 3 days ago   fstrim.timer                 fstrim.service  


  But home partition is not trimmed:
  ...
  jun 14 00:00:10 moon fstrim[5137]: /: 29,1 GiB (31264600064 bytes) trimmed on /dev/nvme0n1p2
  jun 14 00:00:10 moon fstrim[5137]: /boot/efi: 239,1 MiB (250755584 bytes) trimmed on /dev/nvme0n1p1
  jun 14 00:00:10 moon systemd[1]: fstrim.service: Succeeded.
  ...


  The fstrim.service is Protected for home:
  sudo systemctl cat fstrim.service 
  # /lib/systemd/system/fstrim.service
  [Unit]
  Description=Discard unused blocks on filesystems from /etc/fstab
  Documentation=man:fstrim(8)
  ConditionVirtualization=!container

  [Service]
  Type=oneshot
  ExecStart=/sbin/fstrim --fstab --verbose --quiet
  ProtectSystem=strict
  ProtectHome=yes
  PrivateDevices=no
  PrivateNetwork=yes
  PrivateUsers=no
  ProtectKernelTunables=yes
  ProtectKernelModules=yes
  ProtectControlGroups=yes
  MemoryDenyWriteExecute=yes
  SystemCallFilter=@default @file-system @basic-io @system-service


  
  I think the problem is:
  https://github.com/karelzak/util-linux/commit/61b384b36105fe682ddf16b9379f446d935603bc

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