Re: IDE CDROM packet command buffer size restriction.

[Jens Axboe <axboe@suse.de>]

On Thu, Oct 31 2002, chrisl@vmware.com wrote:
> Hi Alan,
> 
> Jens seems too busy to check out this patch. I post it here again
> hopefully to get boarder audiences:

Yes sorry, it's fallen through the cracks.

> VMware try to use the generic packet interface (CDROM_SEND_PACKET)
> for cdrom simulation. There are some packet command used by windows
> can return different data size, depend on the type of CD in the CDROM.
> Current linux kernel will fail the ioctl call if packet command return
> data less than expected.
> 
> ide-scsi driver do not have this problem.
> 
> We make a patch allow kernel return successful and return the actual
> transfer data size. Is it the prefer behavior in this case? If not,
> what is the best way to solve this problem?

The patch does look good, thanks.

> P.S. I am very surprised to find out that, vmware suffers from bugs
> in cdrom driver for years. Developers give up after some attempt to
> submit patches to kernel, it is not easy to make it right at the first
> time. The broken sense data bug should have been fix long time ago if
> they try hard enough.

I can only say resend and resend. It's no secret that I regurlarly loose
patches and don't respond to emails, because there are just so many of
them.

-- 
Jens Axboe