kern/138789: cd(4) patch for drives/discs failing the 'read toc'
command
Juergen Lock
nox at jelal.kn-bremen.de
Sun Sep 13 21:20:08 UTC 2009
>Number: 138789
>Category: kern
>Synopsis: cd(4) patch for drives/discs failing the 'read toc' command
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Sep 13 21:20:07 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator: Juergen Lock
>Release: FreeBSD 8.0-BETA3 amd64
>Organization:
me? organized??
>Environment:
System: FreeBSD triton8.kn-bremen.de 8.0-BETA3 FreeBSD 8.0-BETA3 #0: Fri Sep 4 20:25:37 CEST 2009 nox at triton8.kn-bremen.de:/usr/obj/data/home/nox/src-r8pb3b/src/sys/TRITON8 amd64
>Description:
As mentioned earlier on -current, cd(4), unlike acd(4), won't read
a disc (returns 0 bytes) when the drive returned a proper disc size
but failed the 'read toc' command. Observed here with a bluray
data disc and, as mentioned later in the thread, also by
Ulrich Spörlein with an external usb/1394 dvd drive and regular
`pressed' dvd data discs.
Thread is here:
http://lists.freebsd.org/pipermail/freebsd-current/2009-August/010316.html
>How-To-Repeat:
Burn a bluray data disc (mine was ~15GB) using e.g. growisofs from
/usr/ports/sysutils/dvd+rw-tools and then try to read it via a
cd(4) device as provided by atapicam(4), ahci(4), or siis(4).
Verify the same disc/drive on an acd(4) device reads just fine.
>Fix:
Index: sys/cam/scsi/scsi_cd.c
@@ -2868,12 +2868,18 @@
}
softc->flags |= CD_FLAG_VALID_TOC;
+
+bailout:
softc->disk->d_maxsize = DFLTPHYS;
softc->disk->d_sectorsize = softc->params.blksize;
softc->disk->d_mediasize =
(off_t)softc->params.blksize * softc->params.disksize;
+/* if
bailout:
+ * is here read requests will fail when the toc cant be read although
+ * CD_FLAG_VALID_MEDIA is set.
+ */
/*
* We unconditionally (re)set the blocksize each time the
>Release-Note:
>Audit-Trail:
>Unformatted:
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