Marius Vollmer <[EMAIL PROTECTED]> writes:
> Hi,
>
> I have trouble accessing the CD-ROM drive from GNU/Hurd. I have the
> Hurd running in a VMware virtual machine, with a virtual drive on hd0,
> and a virtual ATAPI CD-ROM on hd1.
>
> After login in as root, I do
>
> # cd /dev
> # MAKEDEV hd1
> # showtrans hd1
> /hurd/storeio hd1
> # cat hd1
> cat: hd1: Invalid argument
After some investigation, I came up with the following patch to GNU
Mach that solves this problem for me:
Index: block.c
===================================================================
RCS file: /cvs/gnumach/linux/dev/glue/block.c,v
retrieving revision 1.3
diff -u -r1.3 block.c
--- block.c 1999/06/27 23:51:47 1.3
+++ block.c 2000/08/15 00:02:54
@@ -1597,7 +1597,17 @@
case DEV_GET_SIZE:
if (disk_major (MAJOR (bd->dev)))
{
+ unsigned real_minor;
+
assert (bd->ds->gd);
+
+ real_minor = MINOR (bd->dev) >> bd->ds->gd->minor_shift;
+ if ((real_minor << bd->ds->gd->minor_shift) != MINOR (bd->dev))
+ real_minor = MINOR (bd->dev);
+
+ printf ("dev %x, minor_shift %d, minor %d, real_minor %d\n",
+ bd->dev, bd->ds->gd->minor_shift,
+ MINOR(bd->dev), real_minor);
if (bd->part >= 0)
{
@@ -1611,7 +1621,7 @@
}
else
(status[DEV_GET_SIZE_DEVICE_SIZE]
- = bd->ds->gd->part[MINOR (bd->dev)].nr_sects << 9);
+ = bd->ds->gd->part[real_minor].nr_sects << 9);
}
else
{
I have no idea what I really did, all I noticed was that
device_get_status was returning a bogus size for hd1 because it
accessed bd->ds->gd->part[64], and that I needed to shift the minor
number to get to the right index, which is 1. However, shifting
always made the system fail in other ways, when calling
device_get_status for a dev number of 0x301, which apparantly refers
to my root partition hd0s1.
So I'm confused now. I hope someone can devise a real fix.
