Messages in this thread |  | | Date | Wed, 16 May 2001 14:54:36 -0600 | From | Richard Gooch <> | Subject | Re: LANANA: To Pending Device Number Registrants |
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H. Peter Anvin writes: > Richard Gooch wrote: > > > > H. Peter Anvin writes: > > > Richard Gooch wrote: > > > > Argh! What I wrote in text is what I meant to say. The code didn't > > > > match. No wonder people seemed to be missing the point. So the line of > > > > code I actually meant was: > > > > if (strcmp (buffer + len - 3, "/cd") != 0) { > > > > > > This is still a really bad idea. You don't want to tie this kind of > > > things to the name. > > > > Why do you think it's a bad idea? > > Because you are now, once again, tying two things that are > completely and utterly unrelated: device classification and device > name. It breaks every time someone comes out with a new device > which is "kind of like an old device, but not really," like > CD-writers (which was kind-of-like WORM, kind-of-like CD-ROM) and > DVD (kind-of-like CD)...
But all devices which export a CD-ROM interface will do so. So the device node that is associated with the CD-ROM driver will export CD-ROM semantics, and the trailing name will be "/cd".
Other interfaces a device exports, such as a CD-RW, appear as a different device node ("generic" for SCSI, because we have no CD-RW classification at this point).
My scheme works already, and works reliably. Nothing had to be done to support the CD-ROM interface to CD-RW and DVD devices.
Regards,
Richard.... Permanent: rgooch@atnf.csiro.au Current: rgooch@ras.ucalgary.ca - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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