On Fri, Feb 19, 2010 at 01:20:25AM +0100, Douglas Gilbert wrote: > So send a START_STOP_UNIT(stop) through the SG_IO > ioctl on a sd device opened RW and as a bonus get > three INQUIRYs (one standard, two VPD pages) and 5 READ > commands! > > If the device is SCSI (as the scsi_debug driver is > simulating) then those READs fail because the drive > is stopped. However if that is an ATA disk behind a > SAT layer, then the disk will be spun up. That defeats > the purpose of the pass-though, especially when it > is being used to spin down the disk. > > My guess, reviewing the bug reports flowing into me is > that this nonsense started around lk 2.6.29 . We should never send INQUIRY or READ commands from the kernel in response to opening a device. But the combination sounds like something udev might be doing for it's stable device indentifier and manual partition scan because I don't trust the kernel thing. Can you check if these commands come from udev or one of the realted tools (hal, device-kit-blah, udisks whatever it is called today) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
