The following excerpt is from Diamond v. U.S. Dist. Court for Central Dist. of California, 661 F.2d 1198 (9th Cir. 1981):
We may not accept mandamus jurisdiction over a matter subject to direct appeal. See Helstoski v. Meanor, 442 U.S. 500, 99 S.Ct. 2445, 61 L.Ed.2d 30 (1979). Thus, the initial question is whether the September 29, 1981 order is subject to direct appeal or to review by mandamus only.
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