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Group some variables based on their sizes to reduce holes. On x86_64, this shrinks the size of 'struct nvmefc_fcp_req' from 112 to 104 bytes. This structure is embedded in some other structures (nvme_fc_fcp_op which itself is embedded in nvme_fcp_op_w_sgl), so it helps reducing the size of these structures too. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Keith Busch <kbusch@kernel.org>