Re: [ANNOUNCE] udev 007 release

[Arnd Bergmann <arnd@arndb.de>]

On Monday 24 November 2003 01:29, Greg KH wrote:

> I think with the ability to capture the output of the CALLOUT rule,
> combined with the ability to put format modifiers in the CALLOUT program
> string, we now have everything in place to emulate the existing devfs
> naming scheme.  Anyone want to verify this or not?

I would prefer to have the ability of creating partition nodes in devfs
style built-in to udev. Devfs used to call the whole disk e.g. 
"/dev/dasd/0123/disk" and the partitions "/dev/dasd/0123/part[1-3]".
This can obviously be done with a CALLOUT rule, but its common enough
to make it a format modifier. AFAIK, this scheme has been used for
ide, scsi and dasd disks, which is about 99% of all disks ever connected
to Linux.

One thing that does not appear to be possible with udev but was common
with devfs is to have multiple links for the same device node, e.g.
/dev/hda1 as well as /dev/ide/host0/bus0/target0/lun0/part1 and
/dev/disk/0/part1.

	Arnd <><

=== namedev.c 1.45 vs edited ==--- 1.45/namedev.c	Sun Nov 23 23:25:12 2003
+++ edited/namedev.c	Mon Nov 24 04:01:10 2003
@@ -523,6 +523,15 @@
 				strcat(pos, udev->kernel_number);
 				dbg("substitute kernel number '%s'", udev->kernel_number);
 				break;
+			case 'N':
+				if (strlen(udev->kernel_number) = 0) {
+					strcat(pos, "disk");
+					break;
+				}
+				strcat(pos, "part");
+				strcat(pos, udev->kernel_number);
+				dbg("substitute kernel number '%s'", udev->kernel_number);
+				break;
 			case 'm':
 				sprintf(pos, "%u", udev->minor);
 				dbg("substitute minor number '%u'", udev->minor);



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