Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 3 Dec 2002 03:05:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 3 Dec 2002 03:05:10 -0500 Received: from ns1.triode.net.au ([202.147.124.1]:18065 "EHLO iggy.triode.net.au") by vger.kernel.org with ESMTP id ; Tue, 3 Dec 2002 03:05:08 -0500 Message-ID: <3DEC6792.3060509@torque.net> Date: Tue, 03 Dec 2002 19:13:06 +1100 From: Douglas Gilbert Reply-To: dougg@torque.net User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020830 X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org Subject: Re: [RFC] remove IDESCSI_SG_TRANSFORM (compile fix) References: <3DEC5B4C.4040208@torque.net> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2225 Lines: 53 Douglas Gilbert wrote: > On Mon, 2002-12-02 at 17:21, Christoph Hellwig wrote: > > On Fri, Nov 29, 2002 at 04:44:35PM -0800, Mike Anderson wrote: > > > Thanks for catching this Christoph I thought the only use was inside > > > SCSI. I could make a patch to scsi-misc to add tag back in. Another > > > option if it is still needed is to switch to "->name == "generic"). > > > > > > Though I have not used this interface I thought if one was using > > > an sg > > > device to a ide-scsi device and the flag was set that sg > > > commands that > > > where not 100% the same as ATAP commands where translated. > > > > Well, imho IDESCSI_SG_TRANSFORM is broken in 2.5. Now that ever block > > driver implements the sg ioctls a sg request can come from sd or sr > > aswell. > > Christoph, > Thanks for alerting me to the implementation (by Jens) of > the sg driver's SG_IO ioctl in drivers/block/scsi_ioctl.c . > > It goes by the name SCSI_IOCTL_SEND_COMMAND which is the same > name as the old ioctl defined in drivers/scsi/scsi_ioctl.c . > As far as I can see if you send that ioctl to a block device > (including an ATA disk) you get the new functionality (i.e. > similar to sg's SG_IO). However if you send that ioctl to > a char device (e.g. st, osst or sg) you get the old > interface (i.e. as found in drivers/scsi/scsi_ioctl.c). > Somewhat confusing. > So old utilities like scsiinfo will now fail for disks > but continue to work for tapes. Correcting my previous post ... On reviewing drivers/block/scsi_ioctl.c it supports both the SG_IO (i.e. equivalent to the sg driver's SG_IO ioctl) and the SCSI_IOCTL_SEND_COMMAND ioctl with the old functionality. So the SCSI_IOCTL_SEND_COMMAND ioctl is consistent for both block and char (scsi) drivers. The SG_IO ioctl first appeared in the lk 2.4 series (2.4.0) while the SCSI_IOCTL_SEND_COMMAND ioctl has been there for a long time (but has been marked as deprecated in the source for some time). Doug Gilbert - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/