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Subject/dev/changer
Date
Hi,

Yep yet another release of my driver :) But this time it actually works...
See the source code and the website for the rest of the documentation available.
For comments etc, send them to: jmassar@unfix.org or check the website at http://unfix.org/projects/changer

Greets,
Jeroen Massar

PS-for-nosy-people:
My linux development&server&router box is called heaven (FQDN:heaven.unfix.org).
My NT X-Workstation (running only ReflectionX most of the time) is called hell (FQDN:hell.unfix.org).
The names have been chosen for the obvious reasons.

Legal Mumbo Jumbo
~~~~~~~~~~~~~~~~~
The code is GPL'ed as attached into the source code. But alongside if you like it
send me a postcard of your country or region you live in.

My snailmail address:
Jeroen Massar
Gortmolenerf 46
2807 EJ Gouda
The Netherlands

Description
~~~~~~~~~~~
/dev/changer will allow you to mount all the cd's in your changer(s) at once.
thus avoiding the hassle with scripts or other custom software.

Status
~~~~~~
Well this is the very first working version. /dev/changer can now be considered to be at
a beta-testing level.

Currently we only have the following problems:
- It's a changer so you technically CAN'T access two slots at the same time.
Thus whenever you spool two movies, one from slot 0 and the other from slot 3
the /dev/changer code will keep swapping between them every request. It'll
get very slow because of this.

I'll work on something like a timer or alike (see the source-code) which will
fix this by simply only allowing a slotchange every n seconds and thus effectivly
allowing datatransfer from/to that slot for that time.

- Cd's aren't locked whenever I mount them.. I'm looking into this one too...

See the source code and the website for the rest of the documentation available.

Using/Installing
~~~~~~~~~~~~~~~~
You'll have to apply the patch to your kernel, then enable either the module or include the driver
into the kernel. eg:
8<-------------------------------------------------------------------------------------------------
root@heaven:/usr/src/local/linux-2.2.4# patch -p0 <changer_19990324.diff
root@heaven:/usr/src/local/linux-2.2.4# make xconfig
root@heaven:/usr/src/local/linux-2.2.4# make-kpkg --revision=42:heaven.2.2.4-chg binary
root@heaven:/usr/src/local/linux-2.2.4# cd ..
root@heaven:/usr/src/local/# dpkg -i *.deb
------------------------------------------------------------------------------------------------->8
line 1: patch the kernel
line 2: configure the kernel (select either CHANGER=module or CHANGER=yes)
line 3: make debian kernel packages, non-debian users could use:
8<----------------------------------------
root@machine:/usr/src/local/linux-2.2.4# make dep bzimage modules modules_install
---------------------------------------->8
then reboot the newly installed kernel, see your favourite kernel HOWTO...

If you've created a module you'll have to insmod it
eg:
8<----------------
alias block-major-42 changer
---------------->8

then you should create enough devices for the changer with:
8<-------------------------------------------------------------------------------------------------------------------------------------
root@heaven:/dev# for i in `seq 255`; do mknod /dev/changer$i b 42 $i; mkdir /cdrom/$i; chown root:cdrom /dev/changer$i /cdrom/$i; done
------------------------------------------------------------------------------------------------------------------------------------->8
after you've done that you'll have to mount the slots, just like an ordinary cdrom, eg:
8<---------------------------------------------------
root@heaven:# mount /dev/changer4 /cdrom/4 -t iso9660
--------------------------------------------------->8
you can ofcourse put these into the /etc/fstab.

If you still got any questions do a: `vi question; cat question | mail jmassar@unfix.org`


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