Hi, 
We hit a bug in which qcow2raw would hang the conversion just short of 100%, 
because the final write queue was never being submitted. If a blktap drivers 
read synchronously, then "submit_events" and "complete" variables are checked 
before getting set, so the fact that reads have finished is not noticed, so the 
final write queue was never submitted.
Note that I have also removed the variables write_complete and read_complete. 
They were unused, and they were also not set correctly in the synchronous case.
Patch attached; please apply to xen-unstable.
Thanks.
Signed-off-by: Charles Coffing <ccoffing@xxxxxxxxxx>

Attachment: qcow2raw-hang.patch
Description: Text document

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