[libvirt] [PATCH] fix path to xen device statistics for newer kernels

[Guido Günther]

Hi,
it seems Xen changed the paths to the block device statistics in sysfs:
from "/sys/devices/xen-backend/vbd-%d-%d/statistics/%s" to
"/sys/bus/xen-backend/devices/vbd-%d-%d/statistics/%s":

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=596004

Attached patch fixes this. O.k. to apply?
 -- Guido

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