target/iblock: Convert WRITE_SAME to blkdev_issue_zeroout
The people who are actively using iblock_execute_write_same_direct() are doing so in the context of ESX VAAI BlockZero, together with EXTENDED_COPY and COMPARE_AND_WRITE primitives. In practice though I've not seen any users of IBLOCK WRITE_SAME for anything other than VAAI BlockZero, so just using blkdev_issue_zeroout() when available, and falling back to iblock_execute_write_same() if the WRITE_SAME buffer contains anything other than zeros should be OK. (Hook up max_write_zeroes_sectors to signal LBPRZ feature bit in target_configure_unmap_from_queue - nab) Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Mike Christie <mchristi@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Jens Axboe <axboe@fb.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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