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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