ovl: change ovl_cleanup_and_whiteout() to take rename lock as needed

Rather than locking the directory(s) before calling
ovl_cleanup_and_whiteout(), change it (and ovl_whiteout()) to do the
locking, so the locking can be fine grained as will be needed for
proposed locking changes.

Sometimes this is called to whiteout something in the index dir, in
which case only that dir must be locked.  In one case it is called on
something in an upperdir, so two directories must be locked.  We use
ovl_lock_rename_workdir() for this and remove the restriction that
upperdir cannot be indexdir - because now sometimes it is.

Reviewed-by: Amir Goldstein <[email protected]>
Signed-off-by: NeilBrown <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Christian Brauner <[email protected]>

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