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Add new command UBLK_U_IO_PREP_IO_CMDS, which is the batch version of UBLK_IO_FETCH_REQ. Add new command UBLK_U_IO_COMMIT_IO_CMDS, which is for committing io command result only, still the batch version. The new command header type is `struct ublk_batch_io`. This patch doesn't actually implement these commands yet, just validates the SQE fields. Reviewed-by: Caleb Sander Mateos <csander@purestorage.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>