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...
