Re: [Xen-devel] [PATCH] Xend: Fix Device Duplicate Check

[Yosuke Iwamatsu <y-iwamatsu@xxxxxxxxxxxxx>]

Hi,

Masaki Kanno wrote:
> Hi Iwamatsu,
>
> Could you improve your patch to cause an error in the following 
> conditions? 
>
> - different blktap disk type:
>  disk = [ 'tap:aio:/xen/root.img,hda1,w', 'tap:sync:/xen/root.img,hdb1,w' ]
>                ^^^                             ^^^^
> - different device type:
>  disk = [ 'file:/xen/root.img,hda1,w', 'tap:***:/xen/root.img,hdb1,w' ]
>            ^^^^                         ^^^
Please take a look at the attach patch, which uses filename
rather than uname for duplicate check of block devices.
Thank you for the suggestion.

  Yosuke

> Best regards,
>  Kan
>
> Mon, 17 Dec 2007 18:28:05 +0900, Yosuke Iwamatsu wrote:
>
> > Hi,
> >
> > This patch fixes device duplicate check as follows.
> >
> > - Add duplicate check for the blktap device
> > - Do case-insensitve comparison for mac addresses
> >
> > Regards,
> > -------------------
> > Yosuke Iwamatsu
> >        NEC Corporation

Xend: Fix device duplicate check.

Signed-off-by: Yosuke Iwamatsu <y-iwamatsu@xxxxxxxxxxxxx>

diff -r 966a6d3b7408 tools/python/xen/xend/XendConfig.py
--- a/tools/python/xen/xend/XendConfig.py       Fri Dec 14 11:50:24 2007 +0000
+++ b/tools/python/xen/xend/XendConfig.py       Tue Dec 18 15:33:09 2007 +0900
@@ -31,7 +31,7 @@ from xen.xend.xenstore.xstransact import
 from xen.xend.xenstore.xstransact import xstransact
 from xen.xend.server.BlktapController import blktap_disk_types
 from xen.xend.server.netif import randomMAC
-from xen.util.blkif import blkdev_name_to_number
+from xen.util.blkif import blkdev_name_to_number, blkdev_uname_to_file
 from xen.util import xsconstants
 import xen.util.auxbin
 
@@ -1023,7 +1023,7 @@ class XendConfig(dict):
     def device_duplicate_check(self, dev_type, dev_info, defined_config):
         defined_devices_sxpr = self.all_devices_sxpr(target = defined_config)
         
-        if dev_type == 'vbd':
+        if dev_type == 'vbd' or dev_type == 'tap':
             dev_uname = dev_info.get('uname')
             blkdev_name = dev_info.get('dev')
             devid = self._blkdev_name_to_number(blkdev_name)
@@ -1031,10 +1031,13 @@ class XendConfig(dict):
                 return
             
             for o_dev_type, o_dev_info in defined_devices_sxpr:
-                if dev_type == o_dev_type:
-                    if dev_uname == sxp.child_value(o_dev_info, 'uname'):
-                        raise XendConfigError('The uname "%s" is already 
defined' %
-                                              dev_uname)
+                if o_dev_type == 'vbd' or o_dev_type == 'tap':
+                    blkdev_file = blkdev_uname_to_file(dev_uname)
+                    o_dev_uname = sxp.child_value(o_dev_info, 'uname')
+                    o_blkdev_file = blkdev_uname_to_file(o_dev_uname)
+                    if blkdev_file == o_blkdev_file:
+                        raise XendConfigError('The file "%s" is already used' %
+                                              blkdev_file)
                     o_blkdev_name = sxp.child_value(o_dev_info, 'dev')
                     o_devid = self._blkdev_name_to_number(o_blkdev_name)
                     if o_devid != None and devid == o_devid:
@@ -1046,7 +1049,7 @@ class XendConfig(dict):
             
             for o_dev_type, o_dev_info in defined_devices_sxpr:
                 if dev_type == o_dev_type:
-                    if dev_mac == sxp.child_value(o_dev_info, 'mac'):
+                    if dev_mac.lower() == sxp.child_value(o_dev_info, 
'mac').lower():
                         raise XendConfigError('The mac "%s" is already 
defined' %
                                               dev_mac)
     

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