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    SubjectRe[2]: [PATCH]trivial: add CDC_RAM to ide-cd capabilities mask
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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

    -andrey
    -
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