io-wq: have io_wq_create() take a 'data' argument

We currently pass in 4 arguments outside of the bounded size. In
preparation for adding one more argument, let's bundle them up in
a struct to make it more readable.

No functional changes in this patch.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io-wq.c

@@ -974,9 +974,7 @@ void io_wq_flush(struct io_wq *wq)
 	}
 }
 
-struct io_wq *io_wq_create(unsigned bounded, struct mm_struct *mm,
-			   struct user_struct *user, get_work_fn *get_work,
-			   put_work_fn *put_work)
+struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
 {
 	int ret = -ENOMEM, i, node;
 	struct io_wq *wq;
@@ -992,11 +990,11 @@ struct io_wq *io_wq_create(unsigned bounded, struct mm_struct *mm,
 		return ERR_PTR(-ENOMEM);
 	}
 
-	wq->get_work = get_work;
-	wq->put_work = put_work;
+	wq->get_work = data->get_work;
+	wq->put_work = data->put_work;
 
 	/* caller must already hold a reference to this */
-	wq->user = user;
+	wq->user = data->user;
 
 	i = 0;
 	for_each_online_node(node) {
@@ -1009,7 +1007,7 @@ struct io_wq *io_wq_create(unsigned bounded, struct mm_struct *mm,
 		wqe->node = node;
 		wqe->acct[IO_WQ_ACCT_BOUND].max_workers = bounded;
 		atomic_set(&wqe->acct[IO_WQ_ACCT_BOUND].nr_running, 0);
-		if (user) {
+		if (wq->user) {
 			wqe->acct[IO_WQ_ACCT_UNBOUND].max_workers =
 					task_rlimit(current, RLIMIT_NPROC);
 		}
@@ -1031,7 +1029,7 @@ struct io_wq *io_wq_create(unsigned bounded, struct mm_struct *mm,
 		goto err;
 
 	/* caller must have already done mmgrab() on this mm */
-	wq->mm = mm;
+	wq->mm = data->mm;
 
 	wq->manager = kthread_create(io_wq_manager, wq, "io_wq_manager");
 	if (!IS_ERR(wq->manager)) {

fs/io-wq.h

@@ -42,9 +42,15 @@ struct io_wq_work {
 typedef void (get_work_fn)(struct io_wq_work *);
 typedef void (put_work_fn)(struct io_wq_work *);
 
-struct io_wq *io_wq_create(unsigned bounded, struct mm_struct *mm,
-				struct user_struct *user,
-				get_work_fn *get_work, put_work_fn *put_work);
+struct io_wq_data {
+	struct mm_struct *mm;
+	struct user_struct *user;
+
+	get_work_fn *get_work;
+	put_work_fn *put_work;
+};
+
+struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data);
 void io_wq_destroy(struct io_wq *wq);
 
 void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);

fs/io_uring.c

@@ -3962,6 +3962,7 @@ static void io_get_work(struct io_wq_work *work)
 static int io_sq_offload_start(struct io_ring_ctx *ctx,
 			       struct io_uring_params *p)
 {
+	struct io_wq_data data;
 	unsigned concurrency;
 	int ret;
 
@@ -4006,10 +4007,14 @@ static int io_sq_offload_start(struct io_ring_ctx *ctx,
 		goto err;
 	}
 
+	data.mm = ctx->sqo_mm;
+	data.user = ctx->user;
+	data.get_work = io_get_work;
+	data.put_work = io_put_work;
+
 	/* Do QD, or 4 * CPUS, whatever is smallest */
 	concurrency = min(ctx->sq_entries, 4 * num_online_cpus());
-	ctx->io_wq = io_wq_create(concurrency, ctx->sqo_mm, ctx->user,
-					io_get_work, io_put_work);
+	ctx->io_wq = io_wq_create(concurrency, &data);
 	if (IS_ERR(ctx->io_wq)) {
 		ret = PTR_ERR(ctx->io_wq);
 		ctx->io_wq = NULL;