Date: Mon, 02 Sep 2013 08:27:16 +0200 From: "Thomas Schmitt" <scdbackup@gmx.net> To: freebsd-stable@freebsd.org Subject: Re: Lost CAM Access to DVD Writer Message-ID: <529964598962419723@scdbackup.webframe.org> In-Reply-To: <5223D3A7.25445.31835A@lausts.acm.org> References: <5223D3A7.25445.31835A@lausts.acm.org>
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Hi,
> I got the same result and error message as I did when trying to dump the
> file system
The question towards FreeBSD developers is therefore:
Why does device "/dev/cd0" with this gesture
... in_fd = open (device,O_RDONLY)) ...
...
if (ioctl (in_fd,CAMGETPASSTHRU,&ccb) < 0)
cause error ENOTTY, as indicated by growisofs message
"Inappropriate ioctl for device"
Maybe it is necessary to write a small demo program,
because growisofs is kindof an anti-example of a clean
software architecture. (Well, a debugger should make
clear how it gets to the failed ioctl attempt.)
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The question towards the port maintainer of growisofs would be
whether there is interest to develop a workaround which avoids
that special ioctl. I would help, if desired.
A test with cdrskin as substitute for growisofs would demonstrate
whether this is worthwhile:
/sbin/dump ... -P 'cdrskin -v dev=/dev/cd0 -eject -' ...
or
dd if=/dev/zero bs=1M count=100 | cdrskin -v dev=/dev/cd0 -eject -
(We have some indication by success of cdrecord. But i am
reluctant for social reasons to analyze the FreeBSD doings
of cdrecord. Its author accuses others of stealing his code.)
I would further like to bring to the porter's attention a bug fix
for growisofs with blank BD-R media:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=713016
Meanwhile well tested by users of Fedora.
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Have a nice day :)
Thomas
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