1de23077eSJens Axboe #ifndef IOU_CORE_H 2de23077eSJens Axboe #define IOU_CORE_H 3de23077eSJens Axboe 4de23077eSJens Axboe #include <linux/errno.h> 5cd40cae2SJens Axboe #include <linux/lockdep.h> 6b5d3ae20SJens Axboe #include <linux/resume_user_mode.h> 7c1755c25SBreno Leitao #include <linux/kasan.h> 8ab1c84d8SPavel Begunkov #include <linux/io_uring_types.h> 944648532SJens Axboe #include <uapi/linux/eventpoll.h> 10ab1c84d8SPavel Begunkov #include "io-wq.h" 11a6b21fbbSPavel Begunkov #include "slist.h" 12ab1c84d8SPavel Begunkov #include "filetable.h" 13de23077eSJens Axboe 14f3b44f92SJens Axboe #ifndef CREATE_TRACE_POINTS 15f3b44f92SJens Axboe #include <trace/events/io_uring.h> 16f3b44f92SJens Axboe #endif 17f3b44f92SJens Axboe 1897b388d7SJens Axboe enum { 1997b388d7SJens Axboe IOU_OK = 0, 2097b388d7SJens Axboe IOU_ISSUE_SKIP_COMPLETE = -EIOCBQUEUED, 21114eccdfSDylan Yudaken 22114eccdfSDylan Yudaken /* 2391482864SPavel Begunkov * Intended only when both IO_URING_F_MULTISHOT is passed 2491482864SPavel Begunkov * to indicate to the poll runner that multishot should be 25114eccdfSDylan Yudaken * removed and the result is set on req->cqe.res. 26114eccdfSDylan Yudaken */ 27114eccdfSDylan Yudaken IOU_STOP_MULTISHOT = -ECANCELED, 2897b388d7SJens Axboe }; 2997b388d7SJens Axboe 30aa1df3a3SPavel Begunkov struct io_uring_cqe *__io_get_cqe(struct io_ring_ctx *ctx, bool overflow); 3168494a65SPavel Begunkov bool io_req_cqe_overflow(struct io_kiocb *req); 32c0e0d6baSDylan Yudaken int io_run_task_work_sig(struct io_ring_ctx *ctx); 33973fc83fSDylan Yudaken void io_req_defer_failed(struct io_kiocb *req, s32 res); 341bec951cSPavel Begunkov void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags); 35b529c96aSDylan Yudaken bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags); 369b8c5475SDylan Yudaken bool io_aux_cqe(struct io_ring_ctx *ctx, bool defer, u64 user_data, s32 res, u32 cflags, 37eb42cebbSPavel Begunkov bool allow_overflow); 389046c641SPavel Begunkov void __io_commit_cqring_flush(struct io_ring_ctx *ctx); 399046c641SPavel Begunkov 409046c641SPavel Begunkov struct page **io_pin_pages(unsigned long ubuf, unsigned long len, int *npages); 419046c641SPavel Begunkov 429046c641SPavel Begunkov struct file *io_file_get_normal(struct io_kiocb *req, int fd); 439046c641SPavel Begunkov struct file *io_file_get_fixed(struct io_kiocb *req, int fd, 449046c641SPavel Begunkov unsigned issue_flags); 459046c641SPavel Begunkov 46f6b543fdSJens Axboe static inline bool io_req_ffs_set(struct io_kiocb *req) 47f6b543fdSJens Axboe { 48f6b543fdSJens Axboe return req->flags & REQ_F_FIXED_FILE; 49f6b543fdSJens Axboe } 50f6b543fdSJens Axboe 51e52d2e58SPavel Begunkov void __io_req_task_work_add(struct io_kiocb *req, bool allow_local); 529046c641SPavel Begunkov bool io_is_uring_fops(struct file *file); 539046c641SPavel Begunkov bool io_alloc_async_data(struct io_kiocb *req); 549046c641SPavel Begunkov void io_req_task_queue(struct io_kiocb *req); 559046c641SPavel Begunkov void io_queue_iowq(struct io_kiocb *req, bool *dont_use); 569046c641SPavel Begunkov void io_req_task_complete(struct io_kiocb *req, bool *locked); 579046c641SPavel Begunkov void io_req_task_queue_fail(struct io_kiocb *req, int ret); 589046c641SPavel Begunkov void io_req_task_submit(struct io_kiocb *req, bool *locked); 599046c641SPavel Begunkov void tctx_task_work(struct callback_head *cb); 609046c641SPavel Begunkov __cold void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); 619046c641SPavel Begunkov int io_uring_alloc_task_context(struct task_struct *task, 629046c641SPavel Begunkov struct io_ring_ctx *ctx); 639046c641SPavel Begunkov 649046c641SPavel Begunkov int io_poll_issue(struct io_kiocb *req, bool *locked); 659046c641SPavel Begunkov int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr); 669046c641SPavel Begunkov int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin); 679046c641SPavel Begunkov void io_free_batch_list(struct io_ring_ctx *ctx, struct io_wq_work_node *node); 689046c641SPavel Begunkov int io_req_prep_async(struct io_kiocb *req); 699046c641SPavel Begunkov 709046c641SPavel Begunkov struct io_wq_work *io_wq_free_work(struct io_wq_work *work); 719046c641SPavel Begunkov void io_wq_submit_work(struct io_wq_work *work); 729046c641SPavel Begunkov 739046c641SPavel Begunkov void io_free_req(struct io_kiocb *req); 749046c641SPavel Begunkov void io_queue_next(struct io_kiocb *req); 7563809137SPavel Begunkov void io_task_refs_refill(struct io_uring_task *tctx); 76bd1a3783SPavel Begunkov bool __io_alloc_req_refill(struct io_ring_ctx *ctx); 779046c641SPavel Begunkov 789046c641SPavel Begunkov bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task, 799046c641SPavel Begunkov bool cancel_all); 809046c641SPavel Begunkov 81f26cc959SPavel Begunkov #define io_lockdep_assert_cq_locked(ctx) \ 82f26cc959SPavel Begunkov do { \ 83f26cc959SPavel Begunkov if (ctx->flags & IORING_SETUP_IOPOLL) { \ 84f26cc959SPavel Begunkov lockdep_assert_held(&ctx->uring_lock); \ 85f26cc959SPavel Begunkov } else if (!ctx->task_complete) { \ 86f26cc959SPavel Begunkov lockdep_assert_held(&ctx->completion_lock); \ 87f26cc959SPavel Begunkov } else if (ctx->submitter_task->flags & PF_EXITING) { \ 88f26cc959SPavel Begunkov lockdep_assert(current_work()); \ 89f26cc959SPavel Begunkov } else { \ 90f26cc959SPavel Begunkov lockdep_assert(current == ctx->submitter_task); \ 91f26cc959SPavel Begunkov } \ 92f26cc959SPavel Begunkov } while (0) 93f26cc959SPavel Begunkov 94e52d2e58SPavel Begunkov static inline void io_req_task_work_add(struct io_kiocb *req) 95e52d2e58SPavel Begunkov { 96e52d2e58SPavel Begunkov __io_req_task_work_add(req, true); 97e52d2e58SPavel Begunkov } 98e52d2e58SPavel Begunkov 999046c641SPavel Begunkov #define io_for_each_link(pos, head) \ 1009046c641SPavel Begunkov for (pos = (head); pos; pos = pos->link) 101f3b44f92SJens Axboe 10225399321SPavel Begunkov void io_cq_unlock_post(struct io_ring_ctx *ctx); 10325399321SPavel Begunkov 104aa1df3a3SPavel Begunkov static inline struct io_uring_cqe *io_get_cqe_overflow(struct io_ring_ctx *ctx, 105aa1df3a3SPavel Begunkov bool overflow) 106f3b44f92SJens Axboe { 107f26cc959SPavel Begunkov io_lockdep_assert_cq_locked(ctx); 108f26cc959SPavel Begunkov 109f3b44f92SJens Axboe if (likely(ctx->cqe_cached < ctx->cqe_sentinel)) { 110f3b44f92SJens Axboe struct io_uring_cqe *cqe = ctx->cqe_cached; 111f3b44f92SJens Axboe 112f3b44f92SJens Axboe ctx->cached_cq_tail++; 113f3b44f92SJens Axboe ctx->cqe_cached++; 114b3659a65SPavel Begunkov if (ctx->flags & IORING_SETUP_CQE32) 115b3659a65SPavel Begunkov ctx->cqe_cached++; 116f3b44f92SJens Axboe return cqe; 117f3b44f92SJens Axboe } 118f3b44f92SJens Axboe 119aa1df3a3SPavel Begunkov return __io_get_cqe(ctx, overflow); 120aa1df3a3SPavel Begunkov } 121aa1df3a3SPavel Begunkov 122aa1df3a3SPavel Begunkov static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) 123aa1df3a3SPavel Begunkov { 124aa1df3a3SPavel Begunkov return io_get_cqe_overflow(ctx, false); 125f3b44f92SJens Axboe } 126f3b44f92SJens Axboe 127f3b44f92SJens Axboe static inline bool __io_fill_cqe_req(struct io_ring_ctx *ctx, 128f3b44f92SJens Axboe struct io_kiocb *req) 129f3b44f92SJens Axboe { 130f3b44f92SJens Axboe struct io_uring_cqe *cqe; 131f3b44f92SJens Axboe 132f3b44f92SJens Axboe /* 133f3b44f92SJens Axboe * If we can't get a cq entry, userspace overflowed the 134f3b44f92SJens Axboe * submission (by quite a lot). Increment the overflow count in 135f3b44f92SJens Axboe * the ring. 136f3b44f92SJens Axboe */ 137f3b44f92SJens Axboe cqe = io_get_cqe(ctx); 138e8c328c3SPavel Begunkov if (unlikely(!cqe)) 139f66f7342SPavel Begunkov return false; 140e0486f3fSDylan Yudaken 141e0486f3fSDylan Yudaken trace_io_uring_complete(req->ctx, req, req->cqe.user_data, 142e0486f3fSDylan Yudaken req->cqe.res, req->cqe.flags, 143e0486f3fSDylan Yudaken (req->flags & REQ_F_CQE32_INIT) ? req->extra1 : 0, 144e0486f3fSDylan Yudaken (req->flags & REQ_F_CQE32_INIT) ? req->extra2 : 0); 145e0486f3fSDylan Yudaken 146f3b44f92SJens Axboe memcpy(cqe, &req->cqe, sizeof(*cqe)); 147e8c328c3SPavel Begunkov 148e8c328c3SPavel Begunkov if (ctx->flags & IORING_SETUP_CQE32) { 149f3b44f92SJens Axboe u64 extra1 = 0, extra2 = 0; 150f3b44f92SJens Axboe 151f3b44f92SJens Axboe if (req->flags & REQ_F_CQE32_INIT) { 152f3b44f92SJens Axboe extra1 = req->extra1; 153f3b44f92SJens Axboe extra2 = req->extra2; 154f3b44f92SJens Axboe } 155f3b44f92SJens Axboe 156f3b44f92SJens Axboe WRITE_ONCE(cqe->big_cqe[0], extra1); 157f3b44f92SJens Axboe WRITE_ONCE(cqe->big_cqe[1], extra2); 158e8c328c3SPavel Begunkov } 159f3b44f92SJens Axboe return true; 160f3b44f92SJens Axboe } 161f3b44f92SJens Axboe 162f66f7342SPavel Begunkov static inline bool io_fill_cqe_req(struct io_ring_ctx *ctx, 163f66f7342SPavel Begunkov struct io_kiocb *req) 164f66f7342SPavel Begunkov { 165f66f7342SPavel Begunkov if (likely(__io_fill_cqe_req(ctx, req))) 166f66f7342SPavel Begunkov return true; 167f66f7342SPavel Begunkov return io_req_cqe_overflow(req); 168f66f7342SPavel Begunkov } 169f66f7342SPavel Begunkov 170531113bbSJens Axboe static inline void req_set_fail(struct io_kiocb *req) 171531113bbSJens Axboe { 172531113bbSJens Axboe req->flags |= REQ_F_FAIL; 173531113bbSJens Axboe if (req->flags & REQ_F_CQE_SKIP) { 174531113bbSJens Axboe req->flags &= ~REQ_F_CQE_SKIP; 175531113bbSJens Axboe req->flags |= REQ_F_SKIP_LINK_CQES; 176531113bbSJens Axboe } 177531113bbSJens Axboe } 178531113bbSJens Axboe 179de23077eSJens Axboe static inline void io_req_set_res(struct io_kiocb *req, s32 res, u32 cflags) 180de23077eSJens Axboe { 181de23077eSJens Axboe req->cqe.res = res; 182de23077eSJens Axboe req->cqe.flags = cflags; 183de23077eSJens Axboe } 184de23077eSJens Axboe 18599f15d8dSJens Axboe static inline bool req_has_async_data(struct io_kiocb *req) 18699f15d8dSJens Axboe { 18799f15d8dSJens Axboe return req->flags & REQ_F_ASYNC_DATA; 18899f15d8dSJens Axboe } 18999f15d8dSJens Axboe 190531113bbSJens Axboe static inline void io_put_file(struct file *file) 191531113bbSJens Axboe { 192531113bbSJens Axboe if (file) 193531113bbSJens Axboe fput(file); 194531113bbSJens Axboe } 195531113bbSJens Axboe 196cd40cae2SJens Axboe static inline void io_ring_submit_unlock(struct io_ring_ctx *ctx, 197cd40cae2SJens Axboe unsigned issue_flags) 198cd40cae2SJens Axboe { 199cd40cae2SJens Axboe lockdep_assert_held(&ctx->uring_lock); 200cd40cae2SJens Axboe if (issue_flags & IO_URING_F_UNLOCKED) 201cd40cae2SJens Axboe mutex_unlock(&ctx->uring_lock); 202cd40cae2SJens Axboe } 203cd40cae2SJens Axboe 204cd40cae2SJens Axboe static inline void io_ring_submit_lock(struct io_ring_ctx *ctx, 205cd40cae2SJens Axboe unsigned issue_flags) 206cd40cae2SJens Axboe { 207cd40cae2SJens Axboe /* 208cd40cae2SJens Axboe * "Normal" inline submissions always hold the uring_lock, since we 209cd40cae2SJens Axboe * grab it from the system call. Same is true for the SQPOLL offload. 210cd40cae2SJens Axboe * The only exception is when we've detached the request and issue it 211cd40cae2SJens Axboe * from an async worker thread, grab the lock for that case. 212cd40cae2SJens Axboe */ 213cd40cae2SJens Axboe if (issue_flags & IO_URING_F_UNLOCKED) 214cd40cae2SJens Axboe mutex_lock(&ctx->uring_lock); 215cd40cae2SJens Axboe lockdep_assert_held(&ctx->uring_lock); 216cd40cae2SJens Axboe } 217cd40cae2SJens Axboe 218f9ead18cSJens Axboe static inline void io_commit_cqring(struct io_ring_ctx *ctx) 219f9ead18cSJens Axboe { 220f9ead18cSJens Axboe /* order cqe stores with ring update */ 221f9ead18cSJens Axboe smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); 222f9ead18cSJens Axboe } 223f9ead18cSJens Axboe 2247b235dd8SPavel Begunkov static inline void io_poll_wq_wake(struct io_ring_ctx *ctx) 2257b235dd8SPavel Begunkov { 226bca39f39SPavel Begunkov if (wq_has_sleeper(&ctx->poll_wq)) 2277b235dd8SPavel Begunkov __wake_up(&ctx->poll_wq, TASK_NORMAL, 0, 2287b235dd8SPavel Begunkov poll_to_key(EPOLL_URING_WAKE | EPOLLIN)); 2297b235dd8SPavel Begunkov } 2307b235dd8SPavel Begunkov 231fc86f9d3SPavel Begunkov /* requires smb_mb() prior, see wq_has_sleeper() */ 232fc86f9d3SPavel Begunkov static inline void __io_cqring_wake(struct io_ring_ctx *ctx) 233f3b44f92SJens Axboe { 234f3b44f92SJens Axboe /* 23544648532SJens Axboe * Trigger waitqueue handler on all waiters on our waitqueue. This 23644648532SJens Axboe * won't necessarily wake up all the tasks, io_should_wake() will make 23744648532SJens Axboe * that decision. 23844648532SJens Axboe * 23944648532SJens Axboe * Pass in EPOLLIN|EPOLL_URING_WAKE as the poll wakeup key. The latter 24044648532SJens Axboe * set in the mask so that if we recurse back into our own poll 24144648532SJens Axboe * waitqueue handlers, we know we have a dependency between eventfd or 24244648532SJens Axboe * epoll and should terminate multishot poll at that point. 243f3b44f92SJens Axboe */ 244fc86f9d3SPavel Begunkov if (waitqueue_active(&ctx->cq_wait)) 24544648532SJens Axboe __wake_up(&ctx->cq_wait, TASK_NORMAL, 0, 24644648532SJens Axboe poll_to_key(EPOLL_URING_WAKE | EPOLLIN)); 247f3b44f92SJens Axboe } 248f3b44f92SJens Axboe 249fc86f9d3SPavel Begunkov static inline void io_cqring_wake(struct io_ring_ctx *ctx) 250fc86f9d3SPavel Begunkov { 251fc86f9d3SPavel Begunkov smp_mb(); 252fc86f9d3SPavel Begunkov __io_cqring_wake(ctx); 253fc86f9d3SPavel Begunkov } 254fc86f9d3SPavel Begunkov 25517437f31SJens Axboe static inline bool io_sqring_full(struct io_ring_ctx *ctx) 25617437f31SJens Axboe { 25717437f31SJens Axboe struct io_rings *r = ctx->rings; 25817437f31SJens Axboe 25917437f31SJens Axboe return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; 26017437f31SJens Axboe } 26117437f31SJens Axboe 26217437f31SJens Axboe static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) 26317437f31SJens Axboe { 26417437f31SJens Axboe struct io_rings *rings = ctx->rings; 26517437f31SJens Axboe 26617437f31SJens Axboe /* make sure SQ entry isn't read before tail */ 26717437f31SJens Axboe return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; 26817437f31SJens Axboe } 26917437f31SJens Axboe 270c0e0d6baSDylan Yudaken static inline int io_run_task_work(void) 27117437f31SJens Axboe { 2727cfe7a09SJens Axboe /* 2737cfe7a09SJens Axboe * Always check-and-clear the task_work notification signal. With how 2747cfe7a09SJens Axboe * signaling works for task_work, we can find it set with nothing to 2757cfe7a09SJens Axboe * run. We need to clear it for that case, like get_signal() does. 2767cfe7a09SJens Axboe */ 27746a525e1SJens Axboe if (test_thread_flag(TIF_NOTIFY_SIGNAL)) 27817437f31SJens Axboe clear_notify_signal(); 279b5d3ae20SJens Axboe /* 280b5d3ae20SJens Axboe * PF_IO_WORKER never returns to userspace, so check here if we have 281b5d3ae20SJens Axboe * notify work that needs processing. 282b5d3ae20SJens Axboe */ 283b5d3ae20SJens Axboe if (current->flags & PF_IO_WORKER && 284*2f2bb1ffSJens Axboe test_thread_flag(TIF_NOTIFY_RESUME)) { 285*2f2bb1ffSJens Axboe __set_current_state(TASK_RUNNING); 286b5d3ae20SJens Axboe resume_user_mode_work(NULL); 287*2f2bb1ffSJens Axboe } 2887cfe7a09SJens Axboe if (task_work_pending(current)) { 28946a525e1SJens Axboe __set_current_state(TASK_RUNNING); 29017437f31SJens Axboe task_work_run(); 291c0e0d6baSDylan Yudaken return 1; 29217437f31SJens Axboe } 29317437f31SJens Axboe 294c0e0d6baSDylan Yudaken return 0; 295c0e0d6baSDylan Yudaken } 296c0e0d6baSDylan Yudaken 297dac6a0eaSJens Axboe static inline bool io_task_work_pending(struct io_ring_ctx *ctx) 298dac6a0eaSJens Axboe { 2996434ec01SJens Axboe return task_work_pending(current) || !wq_list_empty(&ctx->work_llist); 300dac6a0eaSJens Axboe } 301dac6a0eaSJens Axboe 302aa1e90f6SPavel Begunkov static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) 303aa1e90f6SPavel Begunkov { 304aa1e90f6SPavel Begunkov if (!*locked) { 305aa1e90f6SPavel Begunkov mutex_lock(&ctx->uring_lock); 306aa1e90f6SPavel Begunkov *locked = true; 307aa1e90f6SPavel Begunkov } 308aa1e90f6SPavel Begunkov } 309aa1e90f6SPavel Begunkov 3109da070b1SPavel Begunkov /* 3119da070b1SPavel Begunkov * Don't complete immediately but use deferred completion infrastructure. 3129da070b1SPavel Begunkov * Protected by ->uring_lock and can only be used either with 3139da070b1SPavel Begunkov * IO_URING_F_COMPLETE_DEFER or inside a tw handler holding the mutex. 3149da070b1SPavel Begunkov */ 3159da070b1SPavel Begunkov static inline void io_req_complete_defer(struct io_kiocb *req) 3169da070b1SPavel Begunkov __must_hold(&req->ctx->uring_lock) 317aa1e90f6SPavel Begunkov { 318aa1e90f6SPavel Begunkov struct io_submit_state *state = &req->ctx->submit_state; 319aa1e90f6SPavel Begunkov 3209da070b1SPavel Begunkov lockdep_assert_held(&req->ctx->uring_lock); 3219da070b1SPavel Begunkov 322aa1e90f6SPavel Begunkov wq_list_add_tail(&req->comp_list, &state->compl_reqs); 323aa1e90f6SPavel Begunkov } 324aa1e90f6SPavel Begunkov 32546929b08SPavel Begunkov static inline void io_commit_cqring_flush(struct io_ring_ctx *ctx) 32646929b08SPavel Begunkov { 327bca39f39SPavel Begunkov if (unlikely(ctx->off_timeout_used || ctx->drain_active || 328bca39f39SPavel Begunkov ctx->has_evfd || ctx->poll_activated)) 32946929b08SPavel Begunkov __io_commit_cqring_flush(ctx); 33046929b08SPavel Begunkov } 33146929b08SPavel Begunkov 33263809137SPavel Begunkov static inline void io_get_task_refs(int nr) 33363809137SPavel Begunkov { 33463809137SPavel Begunkov struct io_uring_task *tctx = current->io_uring; 33563809137SPavel Begunkov 33663809137SPavel Begunkov tctx->cached_refs -= nr; 33763809137SPavel Begunkov if (unlikely(tctx->cached_refs < 0)) 33863809137SPavel Begunkov io_task_refs_refill(tctx); 33963809137SPavel Begunkov } 34063809137SPavel Begunkov 341bd1a3783SPavel Begunkov static inline bool io_req_cache_empty(struct io_ring_ctx *ctx) 342bd1a3783SPavel Begunkov { 343bd1a3783SPavel Begunkov return !ctx->submit_state.free_list.next; 344bd1a3783SPavel Begunkov } 345bd1a3783SPavel Begunkov 346c1755c25SBreno Leitao extern struct kmem_cache *req_cachep; 347c1755c25SBreno Leitao 348c8576f3eSPavel Begunkov static inline struct io_kiocb *io_extract_req(struct io_ring_ctx *ctx) 349bd1a3783SPavel Begunkov { 350c1755c25SBreno Leitao struct io_kiocb *req; 351bd1a3783SPavel Begunkov 352c1755c25SBreno Leitao req = container_of(ctx->submit_state.free_list.next, struct io_kiocb, comp_list); 353c1755c25SBreno Leitao kasan_unpoison_object_data(req_cachep, req); 354c1755c25SBreno Leitao wq_stack_extract(&ctx->submit_state.free_list); 355c1755c25SBreno Leitao return req; 356bd1a3783SPavel Begunkov } 357bd1a3783SPavel Begunkov 358c8576f3eSPavel Begunkov static inline bool io_alloc_req(struct io_ring_ctx *ctx, struct io_kiocb **req) 359c8576f3eSPavel Begunkov { 360c8576f3eSPavel Begunkov if (unlikely(io_req_cache_empty(ctx))) { 361c8576f3eSPavel Begunkov if (!__io_alloc_req_refill(ctx)) 362c8576f3eSPavel Begunkov return false; 363c8576f3eSPavel Begunkov } 364c8576f3eSPavel Begunkov *req = io_extract_req(ctx); 365c8576f3eSPavel Begunkov return true; 366c8576f3eSPavel Begunkov } 367c8576f3eSPavel Begunkov 368140102aeSPavel Begunkov static inline bool io_allowed_defer_tw_run(struct io_ring_ctx *ctx) 369140102aeSPavel Begunkov { 370140102aeSPavel Begunkov return likely(ctx->submitter_task == current); 371140102aeSPavel Begunkov } 372140102aeSPavel Begunkov 37376de6749SPavel Begunkov static inline bool io_allowed_run_tw(struct io_ring_ctx *ctx) 37476de6749SPavel Begunkov { 3756567506bSPavel Begunkov return likely(!(ctx->flags & IORING_SETUP_DEFER_TASKRUN) || 3766567506bSPavel Begunkov ctx->submitter_task == current); 37776de6749SPavel Begunkov } 37876de6749SPavel Begunkov 379833b5dffSPavel Begunkov static inline void io_req_queue_tw_complete(struct io_kiocb *req, s32 res) 380833b5dffSPavel Begunkov { 381833b5dffSPavel Begunkov io_req_set_res(req, res, 0); 382833b5dffSPavel Begunkov req->io_task_work.func = io_req_task_complete; 383833b5dffSPavel Begunkov io_req_task_work_add(req); 384833b5dffSPavel Begunkov } 385833b5dffSPavel Begunkov 386de23077eSJens Axboe #endif 387