io_uring: export req alloc from core

We want to do request allocation out of the core io_uring code, make the
allocation functions public for other io_uring parts.
Signed-off-by: NPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0314fedd3a02a514210ba42d4720332538c65956.1658913593.git.asml.silence@gmail.comSigned-off-by: NJens Axboe <axboe@kernel.dk>

io_uring/io_uring.c

@@ -852,18 +852,13 @@ static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx,
 	spin_unlock(&ctx->completion_lock);
 }
 
-static inline bool io_req_cache_empty(struct io_ring_ctx *ctx)
-{
-	return !ctx->submit_state.free_list.next;
-}
-
 /*
  * A request might get retired back into the request caches even before opcode
  * handlers and io_issue_sqe() are done with it, e.g. inline completion path.
  * Because of that, io_alloc_req() should be called only under ->uring_lock
  * and with extra caution to not get a request that is still worked on.
  */
-static __cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx)
+__cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx)
 	__must_hold(&ctx->uring_lock)
 {
 	gfp_t gfp = GFP_KERNEL | __GFP_NOWARN;
@@ -904,21 +899,6 @@ static __cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx)
 	return true;
 }
 
-static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx)
-{
-	if (unlikely(io_req_cache_empty(ctx)))
-		return __io_alloc_req_refill(ctx);
-	return true;
-}
-
-static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx)
-{
-	struct io_wq_work_node *node;
-
-	node = wq_stack_extract(&ctx->submit_state.free_list);
-	return container_of(node, struct io_kiocb, comp_list);
-}
-
 static inline void io_dismantle_req(struct io_kiocb *req)
 {
 	unsigned int flags = req->flags;

io_uring/io_uring.h

@@ -75,6 +75,7 @@ void io_free_req(struct io_kiocb *req);
 void io_queue_next(struct io_kiocb *req);
 void __io_put_task(struct task_struct *task, int nr);
 void io_task_refs_refill(struct io_uring_task *tctx);
+bool __io_alloc_req_refill(struct io_ring_ctx *ctx);
 
 bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task,
 			bool cancel_all);
@@ -280,4 +281,24 @@ static inline void io_get_task_refs(int nr)
 		io_task_refs_refill(tctx);
 }
 
+static inline bool io_req_cache_empty(struct io_ring_ctx *ctx)
+{
+	return !ctx->submit_state.free_list.next;
+}
+
+static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx)
+{
+	if (unlikely(io_req_cache_empty(ctx)))
+		return __io_alloc_req_refill(ctx);
+	return true;
+}
+
+static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx)
+{
+	struct io_wq_work_node *node;
+
+	node = wq_stack_extract(&ctx->submit_state.free_list);
+	return container_of(node, struct io_kiocb, comp_list);
+}
+
 #endif