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io_uring/zctx: separate notification user_data

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People previously asked for the notification CQE to have a different
user_data value from the main request completion. It's useful to
separate buffer and request handling logic and avoid separately
refcounting the request.

Let the user pass the notification user_data in sqe->addr3. If zero,
it'll inherit sqe->user_data as before. It doesn't change the rules for
when the user can expect a notification CQE, and it should still check
the IORING_CQE_F_MORE flag.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2026-02-16 11:48:52 +00:00 committed by Jens Axboe
parent dce00c8303
commit cb94873336
1 changed files with 7 additions and 2 deletions
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9
io_uring/net.c
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@ -1333,11 +1333,12 @@ int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
struct io_ring_ctx *ctx = req->ctx;
struct io_async_msghdr *iomsg;
struct io_kiocb *notif;
u64 user_data;
int ret;
zc->done_io = 0;
if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3)))
if (unlikely(READ_ONCE(sqe->__pad2[0])))
return -EINVAL;
/* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */
if (req->flags & REQ_F_CQE_SKIP)
@ -1346,7 +1347,11 @@ int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
notif = zc->notif = io_alloc_notif(ctx);
if (!notif)
return -ENOMEM;
notif->cqe.user_data = req->cqe.user_data;
user_data = READ_ONCE(sqe->addr3);
if (!user_data)
user_data = req->cqe.user_data;
notif->cqe.user_data = user_data;
notif->cqe.res = 0;
notif->cqe.flags = IORING_CQE_F_NOTIF;
req->flags |= REQ_F_NEED_CLEANUP | REQ_F_POLL_NO_LAZY;