[Virtio-fs] Puzzle about rootflags, restorecon "operation not supported"

[Stefan Hajnoczi]

On Thu, Oct 15, 2020 at 06:57:09PM -0500, Harry G. Coin wrote:
> The 'mainline generic' version of the latest kernel fails to parse
> 'fuse' virtiofs options on root kernel boots.  Not only dax, but all the
> 'fuse' usual ones as well.  (None of
> default_permissions,allow_other,user_id=0 etc are accepted).
> 
> Is that what you expected of the mainline kernel?  I learned of this
> when trying to understand this further problem:
> 
> SELinux's 'restorecon' and other attempts to change security attributes
> then fails with "operation not supported".
> 
> I could only get sshd able to accept connections by changing SELinux to
> permissive.  The commands necessary to change the security attributes
> failed with the 'operation not supported' issue.
> 
> Ideas?

Hi Harry,
FUSE mount options were removed from virtiofs at one point. I think this
is expected. The reason is because the options you listed are the
default for virtiofs and don't need to be specified explicitly.

I have CCed Miklos in case things have changed or I missed something.

Stefan
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