block: Add *tighten_restrictions to *check*_perm()
This patch makes three functions report whether the necessary permission change tightens restrictions or not. These functions are: - bdrv_check_perm() - bdrv_check_update_perm() - bdrv_child_check_perm() Callers can use this result to decide whether a failure is fatal or not (see the next patch). Signed-off-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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