Re: 2.6.0, cdrom still showing directories after being erased

[Richard B. Johnson]

On Tue, 3 Feb 2004, Tomas Zvala wrote:

> Hi,
> I believe he meant to write he umounted it.
> The problem is that there is still some data left in CDRW's cache and it
> needs to be emptied. That happens when CDRW is ejected and reinserted
> (that is why windows burning software ie. Nero wants to eject the CDR/RW
> when it gets written or erased).
> Maybe kernel could flush the buffers/caches or whatever is there when
> CDROM gets mounted. But im afraid about compatibility with broken drives
> such as LG.
>
> Tomas Zvala

That's not what he said and, I assure you that if he unmounted
it there would not be any buffers to flush. Execute `man umount`.

The problem is that the cd-burner allowed the read-only file-system
to be modified while it was mounted. That is an applications problem
because the file-system is R/O, but the device is not. The kernel
will correctly prevent writes to the R/O file-system, and will
correctly allow writes to the underlying device. It is up to
the application (cdrecord) to prevent undesired operations.

>
> Richard B. Johnson wrote:
>
> >On Tue, 3 Feb 2004, Martin [iso-8859-2] Povolný wrote:
> >
> >
> >
> >>I have debian's 2.6.0-686-smp only with PNP BIOS disabled (fails to
> >>boot with enabled, as described by other people).
> >>
> >>I did
> >>
> >>$ mount /cdrom/
> >>$ ls /cdrom/
> >>
> >>got listing of files and directories on the cdrom
> >>then
> >>
> >>$ cdrecord dev=/dev/hdc -blank=fast -v
> >>...
> >>Blanking time:   21.570s
> >>$ mount /cdrom
> >>$ ls /cdrom
> >>
> >>
> >
> >Can you really initialize the CDROM while it's mounted? Although
> >the kernel doesn't care, cdrecord should. Suggest that you
> >contact the cdrecord author.
> >
> >Cheers,
> >Dick Johnson
> >Penguin : Linux version 2.4.24 on an i686 machine (797.90 BogoMips).
> >            Note 96.31% of all statistics are fiction.
> >
> >
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> >
> >
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Cheers,
Dick Johnson
Penguin : Linux version 2.4.24 on an i686 machine (797.90 BogoMips).
            Note 96.31% of all statistics are fiction.


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