svn commit: r244663 - stable/9

[Konstantin Belousov]

On Mon, Dec 24, 2012 at 12:04:03PM -0800, Alfred Perlstein wrote:
> On 12/24/12 11:24 AM, Adrian Chadd wrote:
> > ... why'd we break the KBI in a stable branch?
> >
> I am not sure either.
> 
> I think a single VOP for nullfs (while ugly) would have sufficed.
No, it doesn't.

Even if it would be sufficient, having a switch right after the
vtable call is silly. But, ignoring the sillyness, having a single
VOP forces a filesystem, needed to override the single bit of behaviour,
to override all behaviours hidden from under the common VOP. Besides
the incovenience, it breaks the bypass. This is why I did not went
this route in the HEAD commit.

Making HEAD and stable diverge for the VOP table is unmaintainable.

At least one other change which cannot be covered by the VOP table
hacking is the struct vfsops new method.

Traditionally (my memory goes back to 6.x branch) we did not maintained
VFS KBI stability on the branches.
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