bb2551bdcb
It appears LOOP_CONFIGURE in 5.8 is even more broken than initially thought: it doesn't properly propgate lo_sizelimit to the block device layer. :-( Let's hence check the block device size immediately after issuing LOOP_CONFIGURE, and if it doesn't match what we just set let's fallback to the old ioctls. This means LOOP_CONFIGURE currently works correctly only for the most simply case: no partition table logic and no size limit. Sad! (Kernel people should really be told about the concepts of tests and even CI, one day!)
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