io_uring: add a {task,files} pair matching helper

Add io_match_task() that matches both task and files.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -1039,6 +1039,26 @@ static inline void io_clean_op(struct io_kiocb *req)
 		__io_clean_op(req);
 }
 
+static bool io_match_task(struct io_kiocb *head,
+			  struct task_struct *task,
+			  struct files_struct *files)
+{
+	struct io_kiocb *req;
+
+	if (task && head->task != task)
+		return false;
+	if (!files)
+		return true;
+
+	io_for_each_link(req, head) {
+		if ((req->flags & REQ_F_WORK_INITIALIZED) &&
+		    (req->work.flags & IO_WQ_WORK_FILES) &&
+		    req->work.identity->files == files)
+			return true;
+	}
+	return false;
+}
+
 static void io_sq_thread_drop_mm_files(void)
 {
 	struct files_struct *files = current->files;
@@ -1687,27 +1707,6 @@ static void io_cqring_mark_overflow(struct io_ring_ctx *ctx)
 	}
 }
 
-static inline bool __io_match_files(struct io_kiocb *req,
-				    struct files_struct *files)
-{
-	return ((req->flags & REQ_F_WORK_INITIALIZED) &&
-	        (req->work.flags & IO_WQ_WORK_FILES)) &&
-		req->work.identity->files == files;
-}
-
-static bool io_match_files(struct io_kiocb *head, struct files_struct *files)
-{
-	struct io_kiocb *req;
-
-	if (!files)
-		return true;
-	io_for_each_link(req, head) {
-		if (__io_match_files(req, files))
-			return true;
-	}
-	return false;
-}
-
 /* Returns true if there are no backlogged entries after the flush */
 static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force,
 				     struct task_struct *tsk,
@@ -1735,9 +1734,7 @@ static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force,
 
 	cqe = NULL;
 	list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) {
-		if (tsk && req->task != tsk)
+		if (!io_match_task(req, tsk, files))
-			continue;
-		if (!io_match_files(req, files))
 			continue;
 
 		cqe = io_get_cqring(ctx);
@@ -8787,8 +8784,7 @@ static void io_cancel_defer_files(struct io_ring_ctx *ctx,
 
 	spin_lock_irq(&ctx->completion_lock);
 	list_for_each_entry_reverse(de, &ctx->defer_list, list) {
-		if (io_task_match(de->req, task) &&
+		if (io_match_task(de->req, task, files)) {
-		    io_match_files(de->req, files)) {
 			list_cut_position(&list, &ctx->defer_list, &de->list);
 			break;
 		}