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blkfront: add uevent for size change
When a blkfront device is resized from dom0, emit a KOBJ_CHANGE uevent to
notify the guest about the change. This allows for custom udev rules, such
as automatically resizing a filesystem, when an event occurs.
With this patch you get these udev
KERNEL[577.206230] change /devices/vbd-51728/block/xvdb (block)
UDEV [577.226218] change /devices/vbd-51728/block/xvdb (block)
Signed-off-by: Marc Olson <marcolso@amazon.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>