Date: Mon, 9 Apr 2001 16:05:39 -0500 From: Dan Nelson <dnelson@emsphone.com> To: Dominik Brettnacher <domi@saargate.de> Cc: freebsd-emulation@freebsd.org Subject: Re: Tape support for linux programs Message-ID: <20010409160538.A12420@dan.emsphone.com> In-Reply-To: <Pine.BSF.4.21.0104091935570.30171-100000@dominik.saargate.de>; from "Dominik Brettnacher" on Mon Apr 9 19:37:15 GMT 2001 References: <fc.41bf7eab41bf7eabd0f4ae6a3b9aca00.dfe5f5@saargate.de> <Pine.BSF.4.21.0104091935570.30171-100000@dominik.saargate.de>
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In the last episode (Apr 09), Dominik Brettnacher said:
> On Mon, 9 Apr 2001, dnelson@emsphone.com wrote:
> > >> has anybody of you plans to make the Linux emulation support tape
> > >> drives so that one can use Linux backup programs on FreeBSD?
> > It's not a matter of tape support; the tape drive support is fine.
> > Lots of Linux backup programs want to send raw SCSI commands, though,
> > which means there needs to be an emulation layer to convert our
> > /dev/pass* devices to support Linux /dev/sgm* 's ioctls.
>
> So does mt use raw SCSI commands?
>
> bash-2.04$ ./mt -f /dev/sa1 status
> ./mt: /dev/sa1: Invalid argument
> bash-2.04$ dmesg |tail
> [...]
> linux: 'ioctl' fd=3, cmd=6d01 ('m',1) not implemented
Most of the 'mt' commands use an ioctl that is not emulated by FreeBSD.
Emulating this would be considerably easier than the /dev/sgc stuff,
but is still a bit complicated. The basic rewind/seek/filemark
operations would be pretty easy.
--
Dan Nelson
dnelson@emsphone.com
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