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qdisk error with rbd

Hello all,

Our current setup is based on Xen 4.11 + Qemu 3.1 with rbd disks, an example of 
a disk that works : 

The same setup with Qemu 5.0 gives this error in /var/log/xen/qemu-dm-* : 
"qemu-system-i386: failed to create 'qdisk' device '51713': failed to create 
drive: Could not open 'rbd:rbd-pool/disk-02-root:id=rbd': No such file or 

Looking at the source in xen-block.c it looks like the driver is forced to 
“file” which wouldn’t work for other type of block devices.

It looks like a regression with the xen-disk introduction.




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