jerome lacoste <[email protected]> wrote:
> On 2/10/06, Joerg Schilling <[email protected]> wrote:
> > "D. Hazelton" <[email protected]> wrote:
> >
> > > And does cdrecord even need libscg anymore? From having actually gone through
> > > your code, Joerg, I can tell you that it does serve a larger purpose. But at
> > > this point I have to ask - besides cdrecord and a few other _COMPACT_ _DISC_
> > > writing programs, does _ANYONE_ use libscg? Is it ever used to access any
> > > other devices that are either SCSI or use a SCSI command protocol (like
> > > ATAPI)? My point there is that you have a wonderful library, but despite
> > > your wishes, there is no proof that it is ever used for anything except
> > > writing/ripping CD's.
> >
> > Name a single program (not using libscg) that implements user space SCSI and runs
> > on as many platforms as cdrecord/libscg does.
>
>
> I have 2 technical questions, and I hope that you will take the time
> to answer them.
>
> 1) extract from the README of the latest stable cdrtools package:
>
> Linux driver design oddities ******************************************
> Although cdrecord supports to use dev=/dev/sgc, it is not recommended
> and it is unsupported.
>
> The /dev/sg* device mapping in Linux is not stable! Using dev=/dev/sgc
> in a shell script may fail after a reboot because the device you want
> to talk to has moved to /dev/sgd. For the proper and OS independent
> dev=<bus>,<tgt>,<lun> syntax read the man page of cdrecord.
>
> My understanding of that is you say to not use dev=/dev/sgc because it
> isn't stable. Now that you've said that bus,tgt,lun is not stable on
> Linux (because of a "Linux bug") why is the b,t,l scheme preferred
> over the /dev/sg* one ?
b,t,l _is_ stable as long as the OS does a reasonable and orthogonal work.
This was true until ~ 2001, when Linux introduced unstable USB handling.
Note that this fact is not a failure from libscg but from Linux.
> 2) design question:
>
> - cdrecord scans then maps the device to the b,t,l scheme.
> - the libsg uses the b,t,l ids in its interface to perform the operations
>
> So now, if cdrecord could have a new option called -scanbusmap that
> displays the mapping it performs in a way that people can parse the
> output, I think that will solve most issues.
The output of cdrecord -scanbus is already parsable, so what is your point?
Jörg
--
EMail:[email protected] (home) Jörg Schilling D-13353 Berlin
[email protected] (uni)
[email protected] (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/old/private/ ftp://ftp.berlios.de/pub/schily
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
