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Message-ID: <806dafc20611091213x2a82c5ccs814ceabbf11e2363@mail.gmail.com>
Date: Thu, 9 Nov 2006 15:13:19 -0500
From: "Monty Montgomery" <monty@xiph.org>
To: "Jeff Garzik" <jgarzik@pobox.com>
Subject: Re: 2.6.19-rc3 system freezes when ripping with cdparanoia at ioctl(SG_IO)
Cc: "Tejun Heo" <htejun@gmail.com>, "Brice Goglin" <Brice.Goglin@ens-lyon.org>,
       "Jens Axboe" <jens.axboe@oracle.com>,
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       "Linux Kernel" <linux-kernel@vger.kernel.org>,
       linux-ide@vger.kernel.org, "Douglas Gilbert" <dougg@torque.net>
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On 11/9/06, Jeff Garzik <jgarzik@pobox.com> 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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