io_uring: move *queue_link_head() from common path
Move io_queue_link_head() to links handling code in io_submit_sqe(),
so it wouldn't need extra checks and would have better data locality.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fs/io_uring.c b/fs/io_uring.c
index a463402..165f77c 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4047,14 +4047,17 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
struct io_submit_state *state, struct io_kiocb **link)
{
struct io_ring_ctx *ctx = req->ctx;
+ unsigned int sqe_flags;
int ret;
+ sqe_flags = READ_ONCE(sqe->flags);
+
/* enforce forwards compatibility on users */
- if (unlikely(sqe->flags & ~SQE_VALID_FLAGS)) {
+ if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) {
ret = -EINVAL;
goto err_req;
}
- if (sqe->flags & IOSQE_ASYNC)
+ if (sqe_flags & IOSQE_ASYNC)
req->flags |= REQ_F_FORCE_ASYNC;
ret = io_req_set_file(state, req, sqe);
@@ -4075,10 +4078,10 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
if (*link) {
struct io_kiocb *head = *link;
- if (sqe->flags & IOSQE_IO_DRAIN)
+ if (sqe_flags & IOSQE_IO_DRAIN)
head->flags |= REQ_F_DRAIN_LINK | REQ_F_IO_DRAIN;
- if (sqe->flags & IOSQE_IO_HARDLINK)
+ if (sqe_flags & IOSQE_IO_HARDLINK)
req->flags |= REQ_F_HARDLINK;
if (io_alloc_async_ctx(req)) {
@@ -4094,9 +4097,15 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
}
trace_io_uring_link(ctx, req, head);
list_add_tail(&req->link_list, &head->link_list);
- } else if (sqe->flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) {
+
+ /* last request of a link, enqueue the link */
+ if (!(sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK))) {
+ io_queue_link_head(head);
+ *link = NULL;
+ }
+ } else if (sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) {
req->flags |= REQ_F_LINK;
- if (sqe->flags & IOSQE_IO_HARDLINK)
+ if (sqe_flags & IOSQE_IO_HARDLINK)
req->flags |= REQ_F_HARDLINK;
INIT_LIST_HEAD(&req->link_list);
@@ -4221,7 +4230,6 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
for (i = 0; i < nr; i++) {
const struct io_uring_sqe *sqe;
struct io_kiocb *req;
- unsigned int sqe_flags;
req = io_get_req(ctx, statep);
if (unlikely(!req)) {
@@ -4243,8 +4251,6 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
}
submitted++;
- sqe_flags = sqe->flags;
-
req->ring_file = ring_file;
req->ring_fd = ring_fd;
req->has_user = *mm != NULL;
@@ -4253,14 +4259,6 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
trace_io_uring_submit_sqe(ctx, req->user_data, true, async);
if (!io_submit_sqe(req, sqe, statep, &link))
break;
- /*
- * If previous wasn't linked and we have a linked command,
- * that's the end of the chain. Submit the previous link.
- */
- if (!(sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) && link) {
- io_queue_link_head(link);
- link = NULL;
- }
}
if (link)
