Paul Brook pointed out that the number of sectors reported
by the SCSI read capacity commands needs to be divided by
s->cluster_size, because bdrv_get_geometry reports the number
of 512 byte sectors, while emulated CDROMs report 2048 byte
sectors back to the guest.

This has no consequences for emulated hard disks, which use
a cluster size of 1.

Signed-off-by: Rik van Riel <riel@redhat.com>

Index: qemu/trunk/hw/scsi-disk.c
===================================================================
--- qemu.orig/trunk/hw/scsi-disk.c
+++ qemu/trunk/hw/scsi-disk.c
@@ -734,6 +734,7 @@ static int32_t scsi_send_command(SCSIDev
         /* The normal LEN field for this command is zero.  */
 	memset(outbuf, 0, 8);
 	bdrv_get_geometry(s->bdrv, &nb_sectors);
+        nb_sectors =/ s->cluster_size;
         /* Returned value is the address of the last sector.  */
         if (nb_sectors) {
             nb_sectors--;
@@ -834,6 +835,7 @@ static int32_t scsi_send_command(SCSIDev
             DPRINTF("SAI READ CAPACITY(16)\n");
             memset(outbuf, 0, len);
             bdrv_get_geometry(s->bdrv, &nb_sectors);
+            nb_sectors =/ s->cluster_size;
             /* Returned value is the address of the last sector.  */
             if (nb_sectors) {
                 nb_sectors--;

-- 
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