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SubjectRe: 2.6.19-rc3 system freezes when ripping with cdparanoia at ioctl(SG_IO)
On 11/9/06, Jeff Garzik <> wrote:

> Mapping 'bidirectional' is a bit difficult.

SGIO_TO_FROM_DEVICE is *not* bdirectional!

From the header that defines it:

#define SG_DXFER_TO_FROM_DEV -4 /* treated like SG_DXFER_FROM_DEV with the
additional property than during indirect
IO the user buffer is copied into the
kernel buffers before the transfer */

That's pretty darned clear. TO_FROM_DEVICE is a straight-up read.
Why the continuing confusion of what this mode is for?

> Given that there are stupid apps/libs out there in the field with this
> behavior, even if the apps are fixed I think we are stuck with the
> stupidities.


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