/dev/cdrom link is dead

Crashed_Again · 02-13-2004, 04:21 PM

Well I made a huge user error after emerging some new packages in Gentoo. I ran 'etc-update' to update my configuration files and that somehow broke my cdrom link. Its a dead link now. It used to point to /dev/cdroms/cdrom0 but their is now such link now. Its not the kernel because I've been running this 2.6 kernel for 2 months now with no problems. Its a conf file that I messed up.

DMESG shows the cdrom drive detected as /dev/hdc yet a quick scan of /dev does not show hdc which I found strange. The only thing I've gotten from doing a lot of research is that /etc/devfsd.conf could have something to do with it. I don't know what devfs is and I am surely not going to start hacking the conf file without knowing whats going on.

Any ideas? Again, the /dev/cdrom link is completly dead.

verdeboy2k · 02-13-2004, 04:34 PM

huh, well devfs is the device filesystem that keeps track of your hardware, but CD-ROMs should be hd_ or sd_ for either IDE or SCSI drives. Try making the link point to /dev/hdc and see what happens, since it already doesn't work, not much harm could come from trying that.

Crashed_Again · 02-13-2004, 04:39 PM

hmmm...well I try to remove the symbolic link:

Code:

root in /dev # rm cdrom
rm: remove symbolic link `cdrom'? y

Then I run 'ls' and /dev/cdrom is still there. It won't let me delete it. This is getting really wierd.

ashoksagar · 02-13-2004, 04:39 PM

What does the ouput of ls show?

Quote:

ls -al /dev/cdrom

Quote:

ls -al /dev/hdc

Quote:

ls -al /dev/cdroms/cdrom0

as verdeboy said you could symlink /dev/hdc to /dev/cdrom and see what happens:

Quote:

ln -sf /dev/hdc /dev/cdrom

Crashed_Again · 02-13-2004, 04:43 PM

Code:

root in /dev # ln -sf /dev/hdc /dev/cdrom
ln: creating symbolic link `/dev/cdrom' to `/dev/hdc': File exists

root in /dev # ls -al /dev/cdrom
lr-xr-xr-x    1 root     root           13 Feb 13 17:47 /dev/cdrom -> cdroms/cdrom0

root in /dev # ls -al /dev/hdc
ls: /dev/hdc: No such file or directory

root in /dev # ls -al /dev/cdroms/cdrom0
ls: /dev/cdroms/cdrom0: No such file or directory

It seems kernel related but as I said this kernel has been working for quiet some time now. Perhaps a module is missing?

quatsch · 02-13-2004, 04:55 PM

do you have a device
/dev/scd0
or
/dev/sg0
(or something similar with the numbers changed?) when I installed kernel2.6.2 the device name assigned to my cdrom changed w/o warning. Also, if you are using ide-scsi on your cd-drive, you should be able to see that it is there with
cdrecord -scanbus

Crashed_Again · 02-13-2004, 04:58 PM

Code:

root in /dev # cdrecord -scanbus
Cdrecord-Clone 2.01a25 (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
cdrecord: No such file or directory. Cannot open '/dev/pg*'. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.
cdrecord: For possible transport specifiers try 'cdrecord dev=help'.

Their is no hint of /dev/scd or /dev/sg. I think that 'Cannot open SCSI driver' may be a good start. What is the name of that module I have to load? ide_scsi?

Crashed_Again · 02-14-2004, 04:32 AM

hmmm...this fixed it:

# modprobe ide-scsi

I thought I did not need scsi emulation in the 2.6 kernel but this works.