From owner-freebsd-current  Fri Apr  3 21:32:22 1998
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X-Mailer: exmh version 2.0.2 2/24/98
to: current@FreeBSD.ORG
Subject: Re: [TECH] physio split the request.. cannot proceed 
In-reply-to: Your message of "Fri, 03 Apr 1998 20:18:20 PST."
             <199804040418.UAA21747@rah.star-gate.com> 
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Date: Fri, 03 Apr 1998 21:32:09 -0800
From: Amancio Hasty <hasty@rah.star-gate.com>
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A bit more info:
This is from scsi_ioctl:do_command
                  
                        bp = malloc(sizeof (struct buf),M_TEMP,M_WAITOK);
                        bzero(bp,sizeof(struct buf)); 
                        d_addr = screq->databuf; 
                        printf("do_command screq->datalen %d \n", screq->
datalen

Apr  3 21:17:09 cioloco /kernel: do_command screq->datalen 5 

in scsio_ioctl.c:scsistrategy
        /* We're in trouble if physio tried to break up the
         * transfer:
         */
        if (bp->b_bcount != screq->datalen) {
                sc_print_addr(sc_link);
                printf("bp->b_bcount %d screq->datalen %d screq->cmdlen %d \n",
                      bp->b_bcount, screq->datalen, screq->cmdlen);

                printf("physio split the request.. cannot proceed\n");
                scsierr(bp, EIO);
                return;
        }


	So where are our scsi experts ? 8)
	Tnks!
	Amancio


Apr  3 21:17:09 cioloco /kernel: uk0: bp->b_bcount 0 screq->datalen 5 screq->
cmd
len 6 

> 
> Try to use the Linux package SANE -- is a scsi scanner package.
> 
> While trying to read from the scsi scanner , I am getting :
> physio split the request.. cannot proceed
> 
> This message is coming from :scsi_ioctl.c:scsistrategy
> 
> A few months ago , I didn't have any problems at all using SANE.
> 
> The scsi read request is way below the 32k limit .
> 
> 	Anyone got a clue as to what changed in the kernel ?
> 
> 	Tnks,
> 	Amancio
> 
> 
> 
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