kern/50691: EOT detection in sa driver prevents mutli volume
dump
Nate Lawson
nate at root.org
Mon Apr 7 23:10:13 PDT 2003
The following reply was made to PR kern/50691; it has been noted by GNATS.
From: Nate Lawson <nate at root.org>
To: Bruce Evans <bde at zeta.org.au>
Cc: lars at koellers.net, FreeBSD-gnats-submit at freebsd.org
Subject: Re: kern/50691: EOT detection in sa driver prevents mutli volume
dump
Date: Mon, 7 Apr 2003 23:05:25 -0700 (PDT)
On Tue, 8 Apr 2003, Bruce Evans wrote:
> On Mon, 7 Apr 2003 lkoeller at freebsd.org wrote:
> > Note: I notice a change of the behaviour of the tape driver somehow in October
> > 2002. Till there a EOT of the tape was correct signaled by the driver during
> > writing. After there was only an error reportet and the nuber of bytes written:
>
> This was the only change in the driver between 4.7 and 4.8.
>
> ----------------------------
> revision 1.85
> date: 2002/12/16 17:40:17; author: trhodes; state: Exp; lines: +4 -0
> The HP DAT 40 tape drive should be able to handle variable block sizes.
> But for some reason the block size is different when a different type of
> tape is placed in the drive. This commit fixes that.
>
> PR: 46209
> Submitted by: Alex Wang <alex at alexwang.com>
> Approved by: mjacob
> ----------------------------
> %%%
>
> %%%
> Index: scsi_sa.c
> ===================================================================
> RCS file: /home/ncvs/src/sys/cam/scsi/scsi_sa.c,v
> retrieving revision 1.45.2.12
> retrieving revision 1.45.2.13
> diff -u -r1.45.2.12 -r1.45.2.13
> --- scsi_sa.c 2 Aug 2002 06:25:56 -0000 1.45.2.12
> +++ scsi_sa.c 17 Dec 2002 17:08:50 -0000 1.45.2.13
> [Id change deleted]
> @@ -304,6 +304,10 @@
> "C15*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_NO_CPAGE, 0,
> },
> #endif
> + {
> + { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
> + "C56*", "*"}, SA_QUIRK_VARIABLE|SA_QUIRK_2FM, 0
> + },
> {
> { T_SEQUENTIAL, SIP_MEDIA_REMOVABLE, "HP",
> "T20*", "*"}, SA_QUIRK_FIXED|SA_QUIRK_1FM, 512
> %%%
I agree with Bruce. Remove the "|SA_QUIRK_2FM" from the C56 line above,
recompile your kernel, and try again. Let us know if this fixes things
for you. Variable block size has little to do with requiring 2 end of
file marks and the original commit should have been more careful about
this.
-Nate
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