On Mon, May 02, 2011 at 09:47:16AM -0500, Eric Sandeen wrote: > I still think we need to stick with the simple rule: "EOPNOTSUPP returned for a particular bio means that it is not supported for that particular bio" - I don't know what else we can do, without creating an ambiguity... > > This does, however, suck for the layer calling in to a complex device. > > What is the overhead for sending discard bios down to a device that does not support it? For a DM-like device there is very little overhead. The bio gets dispatched to make_request and failed in there almost immediately. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
