On Wed, May 10, 2017 at 09:50:35PM -0700, Nicholas A. Bellinger wrote: > 1) Expose a block_device or request_queue bit to signal 'real LBPRZ' > support up to IBLOCK, in order to maintain SCSI target feature > compatibility. No way. If you want to zero use REQ_OP_WRITE_ZEROES..