[PATCH v3] nfs: Fix automount superblock LSM init problem, preventing sb sharing

[Paul Moore]

On Thu, Aug 18, 2022 at 9:14 AM David Howells <dhowells at redhat.com> wrote:
> Paul Moore <paul at paul-moore.com> wrote:
>
> > I guess my question is this: for inodes inside the superblock, does
> > their superblock pointer point to the submount's superblock, or the
> > parent filesystem's superblock?
>
> They have to point to the submount superblock.  Too many things would break, I
> think, if inode->i_sb pointed to the wrong place.  As far as the VFS is
> concerned, apart from the way it is mounted, it's a perfectly normal
> superblock.

If the submount inodes point back to the submount's superblock then it
seems reasonable that the rootcontext should remain unset to me.

-- 
paul-moore.com