vboxsf does not get autoloaded when a mount happens (fs-vboxsf alias missing)

[hyperair]

When the vboxsf kernel module is not loaded, mounting a shared folder (e.g. mount -t vboxsf foo /media/foo` fails with ENODEV.

The reason for this is that vboxsf lacks the fs-vboxsf alias, which is what the kernel uses to autoload filesystem modules during mount. This can be fixed by adding the following to vboxsf/vfsmod.c:

MODULE_ALIAS_FS("vboxsf");

Alternatively, it can be worked around by adding "alias fs-vboxsf vboxsf" to a file in /etc/modprobe.d.

Please see the attached MIT-licensed patch for a proposed fix.

[Frank Mehnert]

Thanks! Added this together with an #ifdef MODULE_ALIAS_FS ... #endif. The change will be part of the next 5.1.x maintenance release.

[Frank Mehnert]

Fix is part of VBox 5.1.16.