Re: [PATCH for-next 4/4] nvme-multipath: add multipathing for uring-passthrough commands

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+static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu(
+        struct io_uring_cmd *ioucmd)
+{

Shouldn't we have a BUILD_BUG_ON(sizeof(struct nvme_uring_cmd_pdu) > sizeof(ioucmd->pdu));
here?

Probably...

+    return (struct nvme_uring_cmd_pdu *)&ioucmd->pdu;
+}
+

diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index d734599cbcd7..57f4dfc83316 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -15,6 +15,8 @@ enum io_uring_cmd_flags {
      IO_URING_F_SQE128        = 4,
      IO_URING_F_CQE32        = 8,
      IO_URING_F_IOPOLL        = 16,
+    /* to indicate that it is a MPATH req*/
+    IO_URING_F_MPATH        = 32,

Isn't that nvme specific? If so I don't think it belongs in io_uring.h at all...

Yes, it doesn't, it should be completely internal to nvme.



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