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The doc from ovirt was a little bit old,
REQ_OP_WRITE_SAME is not used anymore in recent kernel,
REQ_OP_WRITE_ZEROES is used since 2017, and
/sys/block/dm-25/queue/write_zeroes_max_bytes
show if the feature is available.
(it's was enabled on my test machine, that's why blkdiscard is a lot
faster than cstream)
--- End Message ---
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