more information on my trouble reading CDROM's with hdc=ide-cd. Anybody else?

[David Zeuthen]

On Thu, 2004-11-18 at 11:09 -0500, Alan Cox wrote:
> On Thu, Nov 18, 2004 at 10:54:49AM -0500, David Zeuthen wrote:
> > Really? Because using the BLKGETSIZE64 ioctl() on the device file we get
> 
> Yes - see the specification.
> 

I'm curious why BLKGETSIZE64 ioctl() then succeeds and give me the size
if you say it's bogus? Care to explain the 4096 byte difference?

Hmm, it looks like I should put code in hal to set size as zero for CD-R
and CD-RW media [1] and then make the fs detection code in hal not look
at the end of the disk if size is zero.

[1] : Exactly what media does this apply to? All non DVD-ROM and CD-ROM?

Btw, wouldn't it be a lot nicer if the kernel started to give out
e.g. /sys/block/hdc/hdc%d for the various partitions and sessions
(assuming hdc is an optical IDE drive)? I guess the kernel could safely
give the right size of /sys/block/hdc/hdc1. With that it would be a lot
easier to support e.g. PhotoCD discs (which are multisession). FWIW,
that's what Darwin does.

Cheers,
David