systemd can't see the files if the disk is mounted to WSL before WSL starts.

[oldshensheep]

Windows Version

Microsoft Windows [Version 10.0.26100.712]

WSL Version

2.2.4.0

Are you using WSL 1 or WSL 2?

• WSL 2
• WSL 1

Kernel Version

5.15.153.1

Distro Version

Arch

Other Software

No response

Repro Steps

1. powershell In Windows

    function mountDisk2WSL {
        param ( $name)
        $dev = Get-CimInstance -query "SELECT * from Win32_DiskDrive" | Where-Object { ($_).Caption -eq $name }
        gsudo wsl --mount $dev.DeviceID --bare
    }
    mountDisk2WSL "Your Disk"

2. mount your disk in WSL (this is not related to ZFS)

sudo zpool import you_zfs_pool
sudo zfs mount -la

3. create a systemd service named test-mount

[Unit]
Description=Test mount

[Service]
ExecStart=/bin/bash -c "ls /your_pool_path/"
Restart=nerver
User=root

[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload
sudo systemctl start test-mount
sudo systemctl status test-mount

Expected Behavior

I can see my file in step 4

> sudo systemctl status test-mount.service
○ test-mount.service - Test mount
     Loaded: loaded (/etc/systemd/system/test-mount.service; enabled; preset: disabled)
     Active: inactive (dead) since date
   Duration: 6ms
    Process: 2254 ExecStart=/bin/bash -c ls /your_pool_path/ (code=exited, status=0/SUCCESS)
   Main PID: 2254 (code=exited, status=0/SUCCESS)

date <host_name> systemd[1]: Started Test mount.
date  <host_name>  bash[2254]: <My files>
date  <host_name>  systemd[1]: test-mount.service: Deactivated successfully.

Actual Behavior

I can't see my file in step 4

> sudo systemctl status test-mount.service
○ test-mount.service - Test mount
     Loaded: loaded (/etc/systemd/system/test-mount.service; enabled; preset: disabled)
     Active: inactive (dead) since date
   Duration: 6ms
    Process: 2254 ExecStart=/bin/bash -c ls /your_pool_path/ (code=exited, status=0/SUCCESS)
   Main PID: 2254 (code=exited, status=0/SUCCESS)

date  <host_name>  systemd[1]: Started Test mount.
date  <host_name>  bash[2254]: <Nothing or something in /your_pool_path/ before mounted>
date  <host_name>  systemd[1]: test-mount.service: Deactivated successfully.

Diagnostic Logs

it can be easily reproduced.

There is a workaround: start WSL before mounting the disk to WSL.
in Repro Steps, add a step before step 1
powershell

    wsl.exe -e bash -c "
    echo starting wsl
    "

This example is for demonstration only. My use case is to access files in WSL through \\wsl.localhost\Arch or Samba. If Samba is managed by systemd and I do not start WSL before mounting the disk, I will not see the files on the disk.

Although it's not a big issue....

[github-actions]

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Download and execute collect-wsl-logs.ps1 in an administrative powershell prompt:

Invoke-WebRequest -UseBasicParsing "https://raw.githubusercontent.com/microsoft/WSL/master/diagnostics/collect-wsl-logs.ps1" -OutFile collect-wsl-logs.ps1
Set-ExecutionPolicy Bypass -Scope Process -Force
.\collect-wsl-logs.ps1

The scipt will output the path of the log file once done.

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View similar issues

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Closed similar issues:

• Enabling systemd loses access to Linux filesystems in WSL from Explorer (#9013), similarity score: 0.71

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[oldshensheep]

I don't use Windows anymore