// SPDX-License-Identifier: GPL-2.0 struct io_tctx_node {	struct list_head	ctx_node;	struct task_struct	*task;	struct io_ring_ctx	*ctx;}; struct io_uring_task *io_uring_alloc_task_context(struct task_struct *task,						  struct io_ring_ctx *ctx);void io_uring_del_tctx_node(unsigned long index);int __io_uring_add_tctx_node(struct io_ring_ctx *ctx);int __io_uring_add_tctx_node_from_submit(struct io_ring_ctx *ctx);void io_uring_clean_tctx(struct io_uring_task *tctx);void io_uring_free_tctx(struct task_struct *tsk); void io_uring_unreg_ringfd(void);int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg,		       unsigned nr_args);int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg,			 unsigned nr_args); /* * Note that this task has used io_uring. We use it for cancelation purposes. */static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx){	struct io_uring_task *tctx = current->io_uring; 	if (likely(tctx && tctx->last == ctx))		return 0; 	return __io_uring_add_tctx_node_from_submit(ctx);}