On 11/9/06, Jeff Garzik <jgarzik@xxxxxxxxx> 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.
*ahem*
Monty
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