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19372e27 Wed Apr 05 12:21:15 CDT 2017 Christoph Hellwig <hch@lst.de> loop: implement REQ_OP_WRITE_ZEROESIt's identical to discard as hole punches will always leave us withzeroes on reads.Signed-off-by: Christoph Hellwig <hch@lst.de>Reviewed-by: Hannes Reinecke <hare@suse.com>Signed-off-by: Jens Axboe <axboe@fb.com>