Date: Wed, 11 Mar 1998 12:26:58 +1100 From: Bruce Evans <bde@zeta.org.au> To: dufault@hda.com, erich@lodgenet.com Cc: freebsd-scsi@FreeBSD.ORG, robsch@robkaos.ruhr.de Subject: Re: Scanner support Message-ID: <199803110126.MAA16949@godzilla.zeta.org.au>
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>>> I set the symlink
>>> ln -s uk0 scanner
>>>
>>> But when I invoke scanimage I get the following message:
>>> Mar 10 18:20:11 robkaos /kernel: uk0: physio split the request.. cannot proc
>>eed
>>> Mar 10 18:20:11 robkaos /kernel: uk0: physio split the request.. cannot proc
>>eed
>>>
>
>I saw almost the same thing with user level scsi commands to pt0, I traced
>it back to scsi_ioctl.c. around line 290, bp gets bzero()ed, so b_kvasize
>is forced to zero, regardless of what was passed, in. I patched as follows:
>Index: scsi_ioctl.c
>===================================================================
>RCS file: /cvs/FreeBSD/src/sys/scsi/scsi_ioctl.c,v
>retrieving revision 1.29
>diff -u -r1.29 scsi_ioctl.c
>--- scsi_ioctl.c 1998/02/01 18:09:46 1.29
>+++ scsi_ioctl.c 1998/03/09 23:18:17
>@@ -292,6 +292,7 @@
> bp->b_bcount = len = screq->datalen;
> bp->b_screq = screq;
> bp->b_sc_link = sc_link;
>+ bp->b_kvasize = len;
> if (len) {
> struct uio auio;
> struct iovec aiov;
>
>
>It's worked on an ncr 53860, and an adaptec 2940 with blocks of
>64 bytes and 64k, maybe sizes too. I'd kind of liked to put
>some upper bound on len, rather than just using it, but this has
>worked.
See PR 5846. b_kvasize should be 0, since the buffer doesn't have
any kva. Setting it to a large value here probably works because
the value is never used except in the broken maxphys().
Bruce
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