// SPDX-License-Identifier: GPL-2.0#ifndef IOU_TW_H#define IOU_TW_H #include <linux/sched.h>#include <linux/percpu-refcount.h>#include <linux/io_uring_types.h> #include "mpscq.h" #define IO_LOCAL_TW_DEFAULT_MAX		20 /* * Terminate the request if either of these conditions are true: * * 1) It's being executed by the original task, but that task is marked *    with PF_EXITING as it's exiting. * 2) PF_KTHREAD is set, in which case the invoker of the task_work is *    our fallback task_work. * 3) The ring has been closed and is going away. */static inline bool io_should_terminate_tw(struct io_ring_ctx *ctx){	return (current->flags & (PF_EXITING | PF_KTHREAD)) || percpu_ref_is_dying(&ctx->refs);} void io_req_task_work_add_remote(struct io_kiocb *req, unsigned flags);void tctx_task_work(struct callback_head *cb);void io_tctx_fallback_work(struct work_struct *work);int io_run_local_work(struct io_ring_ctx *ctx, int min_events, int max_events);int io_run_task_work_sig(struct io_ring_ctx *ctx); __cold void io_cancel_local_task_work(struct io_ring_ctx *ctx);int io_run_local_work_locked(struct io_ring_ctx *ctx, int min_events); void io_req_local_work_add(struct io_kiocb *req, unsigned flags);void io_req_normal_work_add(struct io_kiocb *req);void tctx_task_work_run(struct io_uring_task *tctx, unsigned int max_entries, unsigned int *count); static inline void __io_req_task_work_add(struct io_kiocb *req, unsigned flags){	if (req->ctx->flags & IORING_SETUP_DEFER_TASKRUN)		io_req_local_work_add(req, flags);	else		io_req_normal_work_add(req);} static inline void io_req_task_work_add(struct io_kiocb *req){	__io_req_task_work_add(req, 0);} static inline int io_run_task_work(void){	bool ret = false; 	/*	 * Always check-and-clear the task_work notification signal. With how	 * signaling works for task_work, we can find it set with nothing to	 * run. We need to clear it for that case, like get_signal() does.	 */	if (test_thread_flag(TIF_NOTIFY_SIGNAL))		clear_notify_signal();	/*	 * PF_IO_WORKER never returns to userspace, so check here if we have	 * notify work that needs processing.	 */	if (current->flags & PF_IO_WORKER) {		if (test_thread_flag(TIF_NOTIFY_RESUME)) {			__set_current_state(TASK_RUNNING);			resume_user_mode_work(NULL);		}		if (current->io_uring) {			unsigned int count = 0; 			__set_current_state(TASK_RUNNING);			tctx_task_work_run(current->io_uring, UINT_MAX, &count);			if (count)				ret = true;		}	}	if (task_work_pending(current)) {		__set_current_state(TASK_RUNNING);		task_work_run();		ret = true;	} 	return ret;} static inline bool io_local_work_pending(struct io_ring_ctx *ctx){	return !mpscq_empty(&ctx->work_list);} static inline bool io_task_work_pending(struct io_ring_ctx *ctx){	return task_work_pending(current) || io_local_work_pending(ctx);} static inline void io_tw_lock(struct io_ring_ctx *ctx, io_tw_token_t tw){	lockdep_assert_held(&ctx->uring_lock);} static inline bool io_allowed_defer_tw_run(struct io_ring_ctx *ctx){	return likely(ctx->submitter_task == current);} static inline bool io_allowed_run_tw(struct io_ring_ctx *ctx){	return likely(!(ctx->flags & IORING_SETUP_DEFER_TASKRUN) ||		      ctx->submitter_task == current);} #endif