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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118// 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