nullfs: vop_rename: fdvp is locked but should not be

[Mikolaj Golub]

 KB> I am curious to look at the final patch. Note that you proposing to add
 KB> fs-specific check to vfs_subr.c. Checking that the the vnode locks are
 KB> different instead of that vnodes itself are different might be better
 KB> approach for vop_rename_pre.

Ok. Looks a bit tricky :-). Then may be it is safe just to skip ASSERT() if
the "target" and "from" vnodes are on different fs, like in the patch below?

I have tried the patch on CURRENT. It looks like it works...

-- 
Mikolaj Golub

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