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Petersen" , Nitesh Shetty , Javier Gonzalez , Matthew Wilcox , Keith Busch , Christoph Hellwig , Keith Busch , "linux-block@vger.kernel.org" , "linux-nvme@lists.infradead.org" , "linux-scsi@vger.kernel.org" , "io-uring@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "joshi.k@samsung.com" Subject: Re: [PATCHv10 0/9] write hints with nvme fdp, scsi streams From: "Martin K. 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Storing the ROD token in > the REQ_OP_COPY_DST bio implies that the REQ_OP_COPY_DST bio is only > submitted after the REQ_OP_COPY_SRC bio has completed. Obviously. You can't issue a WRITE USING TOKEN until you have the token. > NVMe users may prefer that REQ_OP_COPY_SRC and REQ_OP_COPY_DST bios > are submitted simultaneously. What would be the benefit of submitting these operations concurrently? As I have explained, it adds substantial complexity and object lifetime issues throughout the stack. To what end? -- Martin K. Petersen Oracle Linux Engineering