Messages in this thread | | | From | Andrey Borzenkov <> | Subject | Re[2]: [PATCH]trivial: add CDC_RAM to ide-cd capabilities mask | Date | Wed, 11 Jan 2006 12:51:12 +0300 |
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-----Original Message----- From: Jens Axboe <axboe@suse.de> To: Andrey Borzenkov <arvidjaar@mail.ru> Date: Wed, 11 Jan 2006 10:29:38 +0100 Subject: Re: [PATCH]trivial: add CDC_RAM to ide-cd capabilities mask
> > On Wed, Jan 11 2006, Andrey Borzenkov wrote: > > > > > > > drive name: sr0 > > > drive speed: 1 > > > drive # of slots: 1 > > > Can close tray: 1 > > > Can open tray: 1 > > > Can lock tray: 1 > > > Can change speed: 0 > > > Can select disk: 0 > > > Can read multisession: 1 > > > Can read MCN: 1 > > > Reports media changed: 1 > > > Can play audio: 1 > > > Can write CD-R: 0 > > > Can write CD-RW: 0 > > > Can read DVD: 0 > > > Can write DVD-R: 0 > > > Can write DVD-RAM: 0 > > > Can read MRW: 1 > > > Can write MRW: 1 > > > Can write RAM: 1 > > > > > > There's no way this drive knows anything about MRW or random-access writing: > > > > > ... > > > And an ATAPI DVD-ROM also reports (before the above patch): > > > > > > Can read MRW: 1 > > > Can write MRW: 1 > > > Can write RAM: 1 > > > > > > > I know. There were patches from Jens for both 2.4 and 2.6 that add MRW > > support to ide-cd for sure; may be for sr too, am not sure. Jens, any > > reasons for them not in mainstream? Otherwise probably ide-cd and sr should > > not announce MRW capabiliies at all, it is too confusing; I'll send a patch > > when I am at home. > > MRW support is in 2.6 since ages. The MRW flag is only detected on open, > so it should disappear from the proc file once you have opened the > drive. It has to be done that way, I'm afraid. >
I see, it is in generic cdrom code, sorry.
is it possible that drive supports MRW_W without supporting any other write method (_R/_RW)? Should not ide-cd/sr - or possibly even cdrom - mask MRW_W if they do not support writing at all?
thank you
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