xfs: d_add_ci() and dcache handling

[OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>]

Hi,

I'm playing with dcache codes recently. Then, by chance, I found newly
added dcache handling looks a bit strange.

xfs_vn_ci_lookup() doesn't create negative dentry (doesn't d_add(dentry,
NULL)), it would be no problem.

But creation path also doesn't do d_rehash() for it, even if it's passed
the non d_rehash()ed dentry. I.e. it just does d_instantiate().

Although I don't know whether it's a intent or not, maybe CI version
wants to do d_add() instead of d_instantiate()?

Thanks.
-- 
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
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