[PATCH] Allow Xend to find device number for sdX or hdX with udev

[Anthony Liguori <aliguori@us.ibm.com>]

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Symptom:
When using a udev-based dom0, if you try to create a domU with a virtual
sda device and you do not have a local scsi device xm create fails.

Fix:
When using udev, only the device nodes needed are made.  The follow
patch changes Xend to return a device number based on:

http://www.lanana.org/docs/device-list/devices.txt

For sd and hd devices if stat() fails.  It was tested against both 2.0.2
and 2.0.3.

Regards,
-- 
Anthony Liguori
Linux Technology Center (LTC) - IBM Austin
E-mail: aliguori@us.ibm.com
Phone: (512) 838-1208

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


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Only in xen-2.0-new/tools/python/xen/lowlevel/xu: xu.c~
diff -ur xen-2.0/tools/python/xen/xend/server/blkif.py xen-2.0-new/tools/python/xen/xend/server/blkif.py
--- xen-2.0/tools/python/xen/xend/server/blkif.py	2005-01-03 21:46:13.000000000 -0600
+++ xen-2.0-new/tools/python/xen/xend/server/blkif.py	2005-01-12 18:40:17.648463000 -0600
@@ -63,6 +63,12 @@
         log.debug("exception looking up device number for %s: %s", name, ex)
 	pass
 
+    if re.match( '/dev/sd[a-p]([0-9]|1[0-5])', n):
+        return 8 * 256 + 16 * (ord(n[7:8]) - ord('a')) + int(n[8:])
+
+    if re.match( '/dev/hd[a-p]([0-9]|[1-5][0-9]|6[0-3])', n):
+        return 3 * 256 + 16 * (ord(n[7:8]) - ord('a')) + int(n[8:])        
+
     # see if this is a hex device number
     if re.match( '^(0x)?[0-9a-fA-F]+$', name ):
 	return string.atoi(name,16)