Re: 64-bit kdev_t - just for playing

From: Roman Zippel (zippel@linux-m68k.org)
Date: Thu Mar 27 2003 - 18:19:25 EST


Hi,

On 27 Mar 2003, Alan Cox wrote:

> > How are these disks registered and how will the dev_t number look like?
>
> Al Viro's work so far makes those issues you can defer nicely.

I know his work, I'm just trying to find out, whether Andries understands
it too, or if he maybe knows something I don't.

> > How will the user know about these numbers?
>
> Devices.txt or dynamic assignment

The first case means a /dev directory with millions of dev entries.
How does the user find out about the number of partitions in the second
case?

> > Who creates these device entries (user or daemon)?
>
> Who cares 8) Thats just the devfs argument all over again 8)

Why? I specifically didn't mention the kernel.
Anyone has to care, somehow this large number space must be managed.

> > SCSI has multiple majors, disks 0-15 are at major 8, disks 16-31 are at
> > 65, ...., disks 112-127 are at major 71. Will this stay the same? Where
> > are the disk 128-xxx?
> > Can I have now more than 15 partitions?
>
> It becomes possible, more importantly we can begin to support
> partitioned CD-ROM both for multisession and for real partition
> tables on CD (eg Macintrash)

How exactly does this become possible?

bye, Roman

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