io_uring: create common fixed_rsrc_data allocation routines

Create common alloc/free fixed_rsrc_data routines for both files and
buffers.

Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
[remove buffer part]
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -7407,6 +7407,31 @@ static int io_rsrc_ref_quiesce(struct fixed_rsrc_data *data,
 	return 0;
 }
 
+static struct fixed_rsrc_data *alloc_fixed_rsrc_data(struct io_ring_ctx *ctx)
+{
+	struct fixed_rsrc_data *data;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return NULL;
+
+	if (percpu_ref_init(&data->refs, io_rsrc_ref_kill,
+			    PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) {
+		kfree(data);
+		return NULL;
+	}
+	data->ctx = ctx;
+	init_completion(&data->done);
+	return data;
+}
+
+static void free_fixed_rsrc_data(struct fixed_rsrc_data *data)
+{
+	percpu_ref_exit(&data->refs);
+	kfree(data->table);
+	kfree(data);
+}
+
 static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
 {
 	struct fixed_rsrc_data *data = ctx->file_data;
@@ -7429,9 +7454,7 @@ static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
 	nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE);
 	for (i = 0; i < nr_tables; i++)
 		kfree(data->table[i].files);
-	kfree(data->table);
+	free_fixed_rsrc_data(data);
-	percpu_ref_exit(&data->refs);
-	kfree(data);
 	ctx->file_data = NULL;
 	ctx->nr_user_files = 0;
 	return 0;
@@ -7866,11 +7889,9 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
 	if (nr_args > IORING_MAX_FIXED_FILES)
 		return -EMFILE;
 
-	file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL);
+	file_data = alloc_fixed_rsrc_data(ctx);
 	if (!file_data)
 		return -ENOMEM;
-	file_data->ctx = ctx;
-	init_completion(&file_data->done);
 
 	nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE);
 	file_data->table = kcalloc(nr_tables, sizeof(*file_data->table),
@@ -7878,12 +7899,8 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
 	if (!file_data->table)
 		goto out_free;
 
-	if (percpu_ref_init(&file_data->refs, io_rsrc_ref_kill,
-				PERCPU_REF_ALLOW_REINIT, GFP_KERNEL))
-		goto out_free;
-
 	if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args))
-		goto out_ref;
+		goto out_free;
 	ctx->file_data = file_data;
 
 	for (i = 0; i < nr_args; i++, ctx->nr_user_files++) {
@@ -7943,11 +7960,8 @@ out_fput:
 	for (i = 0; i < nr_tables; i++)
 		kfree(file_data->table[i].files);
 	ctx->nr_user_files = 0;
-out_ref:
-	percpu_ref_exit(&file_data->refs);
 out_free:
-	kfree(file_data->table);
+	free_fixed_rsrc_data(ctx->file_data);
-	kfree(file_data);
 	ctx->file_data = NULL;
 	return ret;
 }