Re: [PATCH for-next 3/4] io_uring: grow a field in struct io_uring_cmd

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Use the leftover space to carve 'next' field that enables linking of
io_uring_cmd structs. Also introduce a list head and few helpers.

This is in preparation to support nvme-mulitpath, allowing multiple
uring passthrough commands to be queued.

Signed-off-by: Kanchan Joshi <joshi.k@xxxxxxxxxxx>
Signed-off-by: Anuj Gupta <anuj20.g@xxxxxxxxxxx>
---
  include/linux/io_uring.h | 38 ++++++++++++++++++++++++++++++++++++--
  1 file changed, 36 insertions(+), 2 deletions(-)

diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index 54063d67506b..d734599cbcd7 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -22,9 +22,14 @@ struct io_uring_cmd {
  	const void	*cmd;
  	/* callback to defer completions to task context */
  	void (*task_work_cb)(struct io_uring_cmd *cmd);
+	struct io_uring_cmd	*next;
  	u32		cmd_op;
-	u32		pad;
-	u8		pdu[32]; /* available inline for free use */
+	u8		pdu[28]; /* available inline for free use */
+};

I think io_uring_cmd will at some point become two cachelines and may
not be worth the effort to limit a pdu to 28 bytes...



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