Updates to wsl.conf no longer immediate #3994

Please fill out the below information:

• Your Windows build number: (Type ver at a Windows Command Prompt)

Microsoft Windows [Version 10.0.18362.30]

• What you're doing and what's happening: (Copy&paste the full set of specific command-line steps necessary to reproduce the behavior, and their output. Include screen shots if that helps demonstrate the problem.)

editing wsl.conf to add this automount section for mounting the C drive with metadata support:

[automount]
options = "metadata,umask=22,fmask=11"

exit and relaunch WSL for the drive to re-mount

• What's wrong / what should be happening instead:

Drive is not remounted with new options. After an unknown period of time (~5 mins?) the change takes effect. This behaviour is seems new in windows 10 "1903". Previous build (1809 - something) the change would take effect immediately upon reload of wsl.

terminating wsl with new command wsl.exe --terminate Ubuntu causes the change to apply immediately

forcibly dismounting and re-mounting the volume with the same mount options works as well (though technicallly not reading the wsl.conf?)

cd ~
sudo umount /mnt/c
sudo mount -t drvfs C: /mnt/c -o metadata,uid=1000,gid=1000,umask=22,fmask=11
cd -

• For WSL launch issues, please collect detailed logs.

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