[question] shouldn't kern_mount() refuse to mount if FS_SINGLE not

[Tigran Aivazian]

Hi guys,

The comments around 'struct file_system_type' say that type->kern_mnt
field is only needed for mounting FS_SINGLE filesystems by means of
kern_mount(). But if so (appears to be true) then surely
kern_mount() should refuse to mount a filesystem for which FS_SINGLE is
not set?

I cc'd Al Viro as I am sure he is the author of this interface so he knows
the answer.

Regards,
Tigran