io_uring: keep io_put_req only responsible for release and put req

We already have io_put_req_find_next to find the next req of the link.
we should not use the io_put_req function to find them. They should be
functions of the same level.

Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 147d1f0..1597838 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -373,7 +373,7 @@ struct io_submit_state {
 static void io_wq_submit_work(struct io_wq_work **workptr);
 static void io_cqring_fill_event(struct io_kiocb *req, long res);
 static void __io_free_req(struct io_kiocb *req);
-static void io_put_req(struct io_kiocb *req, struct io_kiocb **nxtptr);
+static void io_put_req(struct io_kiocb *req);
 static void io_double_put_req(struct io_kiocb *req);
 
 static struct kmem_cache *req_cachep;
@@ -559,7 +559,7 @@ static void io_kill_timeout(struct io_kiocb *req)
                atomic_inc(&req->ctx->cq_timeouts);
                list_del_init(&req->list);
                io_cqring_fill_event(req, 0);
-               io_put_req(req, NULL);
+               io_put_req(req);
        }
 }
 
@@ -668,7 +668,7 @@ static void io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)
        while (!list_empty(&list)) {
                req = list_first_entry(&list, struct io_kiocb, list);
                list_del(&req->list);
-               io_put_req(req, NULL);
+               io_put_req(req);
        }
 }
 
@@ -802,7 +802,7 @@ static bool io_link_cancel_timeout(struct io_kiocb *req)
                io_cqring_fill_event(req, -ECANCELED);
                io_commit_cqring(ctx);
                req->flags &= ~REQ_F_LINK;
-               io_put_req(req, NULL);
+               io_put_req(req);
                return true;
        }
 
@@ -921,21 +921,13 @@ static void io_free_req(struct io_kiocb *req, struct io_kiocb **nxt)
  * Drop reference to request, return next in chain (if there is one) if this
  * was the last reference to this request.
  */
-static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req)
+static void io_put_req_find_next(struct io_kiocb *req, struct io_kiocb **nxtptr)
 {
        struct io_kiocb *nxt = NULL;
 
        if (refcount_dec_and_test(&req->refs))
                io_free_req(req, &nxt);
 
-       return nxt;
-}
-
-static void io_put_req(struct io_kiocb *req, struct io_kiocb **nxtptr)
-{
-       struct io_kiocb *nxt;
-
-       nxt = io_put_req_find_next(req);
        if (nxt) {
                if (nxtptr)
                        *nxtptr = nxt;
@@ -944,6 +936,12 @@ static void io_put_req(struct io_kiocb *req, struct io_kiocb **nxtptr)
        }
 }
 
+static void io_put_req(struct io_kiocb *req)
+{
+       if (refcount_dec_and_test(&req->refs))
+               io_free_req(req, NULL);
+}
+
 static void io_double_put_req(struct io_kiocb *req)
 {
        /* drop both submit and complete references */
@@ -1197,15 +1195,18 @@ static void io_complete_rw(struct kiocb *kiocb, long res, long res2)
        struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw);
 
        io_complete_rw_common(kiocb, res);
-       io_put_req(req, NULL);
+       io_put_req(req);
 }
 
 static struct io_kiocb *__io_complete_rw(struct kiocb *kiocb, long res)
 {
        struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw);
+       struct io_kiocb *nxt = NULL;
 
        io_complete_rw_common(kiocb, res);
-       return io_put_req_find_next(req);
+       io_put_req_find_next(req, &nxt);
+
+       return nxt;
 }
 
 static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2)
@@ -1698,7 +1699,7 @@ static int io_nop(struct io_kiocb *req)
                return -EINVAL;
 
        io_cqring_add_event(req, 0);
-       io_put_req(req, NULL);
+       io_put_req(req);
        return 0;
 }
 
@@ -1745,7 +1746,7 @@ static int io_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe,
        if (ret < 0 && (req->flags & REQ_F_LINK))
                req->flags |= REQ_F_FAIL_LINK;
        io_cqring_add_event(req, ret);
-       io_put_req(req, nxt);
+       io_put_req_find_next(req, nxt);
        return 0;
 }
 
@@ -1792,7 +1793,7 @@ static int io_sync_file_range(struct io_kiocb *req,
        if (ret < 0 && (req->flags & REQ_F_LINK))
                req->flags |= REQ_F_FAIL_LINK;
        io_cqring_add_event(req, ret);
-       io_put_req(req, nxt);
+       io_put_req_find_next(req, nxt);
        return 0;
 }
 
@@ -1830,7 +1831,7 @@ static int io_send_recvmsg(struct io_kiocb *req, const struct io_uring_sqe *sqe,
        io_cqring_add_event(req, ret);
        if (ret < 0 && (req->flags & REQ_F_LINK))
                req->flags |= REQ_F_FAIL_LINK;
-       io_put_req(req, nxt);
+       io_put_req_find_next(req, nxt);
        return 0;
 }
 #endif
@@ -1884,7 +1885,7 @@ static int io_accept(struct io_kiocb *req, const struct io_uring_sqe *sqe,
        if (ret < 0 && (req->flags & REQ_F_LINK))
                req->flags |= REQ_F_FAIL_LINK;
        io_cqring_add_event(req, ret);
-       io_put_req(req, nxt);
+       io_put_req_find_next(req, nxt);
        return 0;
 #else
        return -EOPNOTSUPP;
@@ -1947,7 +1948,7 @@ static int io_poll_remove(struct io_kiocb *req, const struct io_uring_sqe *sqe)
        io_cqring_add_event(req, ret);
        if (ret < 0 && (req->flags & REQ_F_LINK))
                req->flags |= REQ_F_FAIL_LINK;
-       io_put_req(req, NULL);
+       io_put_req(req);
        return 0;
 }
 
@@ -1995,7 +1996,7 @@ static void io_poll_complete_work(struct io_wq_work **workptr)
 
        io_cqring_ev_posted(ctx);
 
-       io_put_req(req, &nxt);
+       io_put_req_find_next(req, &nxt);
        if (nxt)
                *workptr = &nxt->work;
 }
@@ -2022,7 +2023,7 @@ static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
                spin_unlock_irqrestore(&ctx->completion_lock, flags);
 
                io_cqring_ev_posted(ctx);
-               io_put_req(req, NULL);
+               io_put_req(req);
        } else {
                io_queue_async_work(req);
        }
@@ -2115,7 +2116,7 @@ static int io_poll_add(struct io_kiocb *req, const struct io_uring_sqe *sqe,
 
        if (mask) {
                io_cqring_ev_posted(ctx);
-               io_put_req(req, nxt);
+               io_put_req_find_next(req, nxt);
        }
        return ipt.error;
 }
@@ -2157,7 +2158,7 @@ static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer)
        io_cqring_ev_posted(ctx);
        if (req->flags & REQ_F_LINK)
                req->flags |= REQ_F_FAIL_LINK;
-       io_put_req(req, NULL);
+       io_put_req(req);
        return HRTIMER_NORESTART;
 }
 
@@ -2200,7 +2201,7 @@ fill_ev:
                io_cqring_ev_posted(ctx);
                if (req->flags & REQ_F_LINK)
                        req->flags |= REQ_F_FAIL_LINK;
-               io_put_req(req, NULL);
+               io_put_req(req);
                return 0;
        }
 
@@ -2216,8 +2217,8 @@ fill_ev:
        spin_unlock_irq(&ctx->completion_lock);
        io_cqring_ev_posted(ctx);
 
-       io_put_req(treq, NULL);
-       io_put_req(req, NULL);
+       io_put_req(treq);
+       io_put_req(req);
        return 0;
 }
 
@@ -2352,7 +2353,7 @@ static int io_async_cancel(struct io_kiocb *req, const struct io_uring_sqe *sqe,
        if (ret < 0 && (req->flags & REQ_F_LINK))
                req->flags |= REQ_F_FAIL_LINK;
        io_cqring_add_event(req, ret);
-       io_put_req(req, nxt);
+       io_put_req_find_next(req, nxt);
        return 0;
 }
 
@@ -2498,13 +2499,13 @@ static void io_wq_submit_work(struct io_wq_work **workptr)
        }
 
        /* drop submission reference */
-       io_put_req(req, NULL);
+       io_put_req(req);
 
        if (ret) {
                if (req->flags & REQ_F_LINK)
                        req->flags |= REQ_F_FAIL_LINK;
                io_cqring_add_event(req, ret);
-               io_put_req(req, NULL);
+               io_put_req(req);
        }
 
        /* async context always use a copy of the sqe */
@@ -2635,7 +2636,7 @@ static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer)
        }
 
        io_cqring_add_event(req, ret);
-       io_put_req(req, NULL);
+       io_put_req(req);
        return HRTIMER_NORESTART;
 }
 
@@ -2667,7 +2668,7 @@ static int io_queue_linked_timeout(struct io_kiocb *req, struct io_kiocb *nxt)
        ret = 0;
 err:
        /* drop submission reference */
-       io_put_req(nxt, NULL);
+       io_put_req(nxt);
 
        if (ret) {
                struct io_ring_ctx *ctx = req->ctx;
@@ -2680,7 +2681,7 @@ err:
                io_cqring_fill_event(nxt, ret);
                trace_io_uring_fail_link(req, nxt);
                io_commit_cqring(ctx);
-               io_put_req(nxt, NULL);
+               io_put_req(nxt);
                ret = -ECANCELED;
        }
 
@@ -2746,14 +2747,14 @@ static int __io_queue_sqe(struct io_kiocb *req)
 
        /* drop submission reference */
 err:
-       io_put_req(req, NULL);
+       io_put_req(req);
 
        /* and drop final reference, if we failed */
        if (ret) {
                io_cqring_add_event(req, ret);
                if (req->flags & REQ_F_LINK)
                        req->flags |= REQ_F_FAIL_LINK;
-               io_put_req(req, NULL);
+               io_put_req(req);
        }
 
        return ret;