[Xen-devel] IDE CD-ROM drive problem

[Evan Deaubl <evan@xxxxxxxxx>]

First off, just wanted to let the developers know this is good stuff, and I've
been having fun playing around with Xen so far, despite some of the
difficulties.  I hope to contribute some work soon to add a couple of more
network drivers to the mix, now that I finally got xeno-unstable working.

I ran into a regression between 1.1 and unstable in the xl_block driver related
to IDE CD-ROM drives.  The drive is correctly detected at boot both by Xen and
Xenolinux, but when I attempt to mount it, like so:

mount /dev/hda /mnt

I get the error "/dev/hda is not a valid block device."

The problems seems to be in this section of code in xenolinux_block_open() in
xl_block.c:

   if(!gd->part[minor].nr_sects) {
        /* Device either doesn't exist, or has zero capacity; we use
           a few cheesy heuristics to return the relevant error code */
        if(disk->capacity || (minor & (gd->max_p - 1))) {
            // we have a real device, but no such partition, or we just
            // have a partition number so guess this is the problem
            return -ENXIO;     // no such device or address
        } else if (gd->flags[minor >> gd->minor_shift] & GENHD_FL_REMOVABLE) {
            // this is a removable device => assume that media is missing
            return -ENOMEDIUM; // media not present (this is a guess)
        } else
            // just go for the general 'no such device' error
            return -ENODEV;    // no such device
    }

If I remove this code, I can mount the CD-ROM with no difficulty.  I've been
investigating the problem myself, but I figured I'd forward to the experts in
charge who have been into this code a lot more than I have.

-- 
Evan Deaubl
evan@xxxxxxxxx



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