Mounting iso images read-write (rw)

[Torsten Reuss <t.reuss@gmx.net>]

Hi,

I've been searching the Net for quite a while to find an answer to this, 
but I found quite different answers (and often enough no answers).

Can Linux mount an iso image read-write via a loopback device?

Here is what I am trying and what doesn't work:

dogbert:/# ls -l /tmp/test.iso
-rw-rw----    1 root     root      1409024 Sep 15 14:49 /tmp/test.iso

dogbert:/# ls -ld /iso
drwxrwx---    2 root     root         1024 Sep 15 14:41 /iso

dogbert:/# mount -t iso9660 -o rw,loop /tmp/test.iso /iso

dogbert:/# mount
/dev/hda5 on / type ext2 (rw,errors=remount-ro)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/vg00/lvol1 on /usr type xfs (rw)
/dev/vg00/lvol2 on /home type xfs (rw)
/dev/vg00/lvol3 on /var type xfs (rw)
/dev/vg00/lvol4 on /tmp type xfs (rw)
/dev/vg00/lvol5 on /usr/src type xfs (rw)
/dev/vg00/lvol6 on /mnt/mp3 type xfs (rw)
/dev/vg00/lvol7 on /var/mqm type xfs (rw)
/dev/vg00/lvol8 on /opt type xfs (rw)
/dev/vg00/lvol9 on /gtpc type xfs (rw)
/dev/vg00/lvol10 on /oracle type xfs (rw)
/dev/hda9 on /mnt/shared type vfat (rw,nosuid,gid=100,umask=007)
/proc/bus/usb on /proc/bus/usb type usbdevfs (rw)
/tmp/test.iso on /iso type iso9660 (rw,loop=/dev/loop0)

dogbert:/# cat /proc/mounts
rootfs / rootfs rw 0 0
/dev/root / ext2 rw 0 0
proc /proc proc rw 0 0
devpts /dev/pts devpts rw 0 0
/dev/vg00/lvol1 /usr xfs rw 0 0
/dev/vg00/lvol2 /home xfs rw 0 0
/dev/vg00/lvol3 /var xfs rw 0 0
/dev/vg00/lvol4 /tmp xfs rw 0 0
/dev/vg00/lvol5 /usr/src xfs rw 0 0
/dev/vg00/lvol6 /mnt/mp3 xfs rw 0 0
/dev/vg00/lvol7 /var/mqm xfs rw 0 0
/dev/vg00/lvol8 /opt xfs rw 0 0
/dev/vg00/lvol9 /gtpc xfs rw 0 0
/dev/vg00/lvol10 /oracle xfs rw 0 0
/dev/hda9 /mnt/shared vfat rw,nosuid 0 0
/proc/bus/usb /proc/bus/usb usbdevfs rw 0 0
/dev/loop0 /iso iso9660 ro 0 0

dogbert:/# touch /iso/x
touch: creating `/iso/x': Read-only file system

Commands above were executed as root. The image was created using 
mkisofs -J -R. Kernel is a 2.4.21.There's nothing special in 
/var/log/syslog.

Any help appreciated, above all an anwer to the question if this 
"should" work, or if iso9660 is really read-only only.

Thanks,
                  Torsten