block: Unify bdrv_child_cb_attach()
Make bdrv_child_cb_attach() call bdrv_backing_attach() for children with a COW role (and drop the reverse call from bdrv_backing_attach()), so it can be used for any child (with a proper role set). Because so far no child has a proper role set, we need a temporary new callback for child_backing.attach that ensures bdrv_backing_attach() is called for all COW children that do not have their role set yet. (Also, move bdrv_child_cb_attach() down to group it with bdrv_inherited_options().) Signed-off-by: NMax Reitz <mreitz@redhat.com> Message-Id: <20200513110544.176672-13-mreitz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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