io_uring: store add. return values for CQE32

This reuses the hash list node for the storage we need to hold the two
64-bit values that must be passed back.

Co-developed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Stefan Roesch <shr@fb.com>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Link: https://lore.kernel.org/r/20220426182134.136504-3-shr@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 106a0db..da91723 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1003,7 +1003,13 @@ struct io_kiocb {
        atomic_t                        poll_refs;
        struct io_task_work             io_task_work;
        /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */
-       struct hlist_node               hash_node;
+       union {
+               struct hlist_node       hash_node;
+               struct {
+                       u64             extra1;
+                       u64             extra2;
+               };
+       };
        /* internal polling, see IORING_FEAT_FAST_POLL */
        struct async_poll               *apoll;
        /* opcode allocated if it needs to store data for async defer */