/etc/fstab created with nonexistant /dev/scd0 and /dev/scd1

[Jason Pearce]

I just completed an install using a sounder 9 CD. When the install finished I
noticed that my cd-rom drives wouldn't auto-mount. Upon inspection I discovered
that their entries in /etc/fstab were as follows.

/dev/scd0 /media/cdrom0 udf,iso9660 ro,user,noauto 0 0
/dev/scd1 /media/cdrom1 udf,iso9660 ro,user,noauto 0 0

udev doesn't creat SCSI cd-rom devices as /dev/scd0 but instead as /dev/sr0.
Changing the lines in /etc/fstab to use the proper device file names fixe the
problem. The following lines work for me.

/dev/sr0 /media/cdrom0 udf,iso9660 ro,user,noauto 0 0
/dev/sr1 /media/cdrom1 udf,iso9660 ro,user,noauto 0 0

---output of 'scsi_info /dev/sr0'---
# scsi_info /dev/sr0
SCSI_ID="0,1,0"
HOST="0"
MODEL="PIONEER DVD-ROM DVD-304"
FW_REV="1.03"

---output of 'scsi_info /dev/sr1'---
# scsi_info /dev/sr1
SCSI_ID="0,2,0"
HOST="0"
MODEL="YAMAHA CRW8824S"
FW_REV="1.00"

[Colin Watson (cjwatson)]

The kernel documentation says:

 11 block SCSI CD-ROM devices
                  0 = /dev/scd0 First SCSI CD-ROM
                  1 = /dev/scd1 Second SCSI CD-ROM
                    ...

                The prefix /dev/sr (instead of /dev/scd) has been deprecated.

Should we fix udev?

[Matt Zimmerman (mdz)]

Hmm, I wasn't aware of that. I see that MAKEDEV now uses scd and symlinks sr to
scd. I think that udev should do the same.

[Matt Zimmerman (mdz)]

Correct me if I misunderstand, but I think the change from "sr" to "scd" needs
to be changed in the sysfs interface exported by the driver, while udev can
handle creating the sr -> scd symlinks

[Herbert Xu (herbert-gondor)]

Not quite. sr is the name of the kernel driver and that isn't going to change.
 Naming devices is user-space policy and should be set in udev.

[Matt Zimmerman (mdz)]

OK, I see how it works now. The default udev configuration uses a regex for
this case, so I didn't find it by searching. I'm not entirely convinced that
"scd" is more correct than "sr", though. Aren't there SCSI removable devices
which are not CD-ROMs?

Can you confirm that the information in devices.txt.gz is correct, and sr is
deprecated in favour of scd? If so, the udev changes are fairly trivial

[Matt Zimmerman (mdz)]

*** Bug 9215 has been marked as a duplicate of this bug. ***

[Herbert Xu (herbert-gondor)]

(In reply to comment #5)
> Can you confirm that the information in devices.txt.gz is correct, and sr is
> deprecated in favour of scd? If so, the udev changes are fairly trivial

Yes scd is the correct name however the sr links should be kept for compatibility.

[Matt Zimmerman (mdz)]

 udev (0.040-1ubuntu3) hoary; urgency=low
 .
   * Use "scd" device names in place of "sr", with a compatibility symlink for
     the latter (Closes: Ubuntu#1909)