diff options
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 1139 |
1 files changed, 608 insertions, 531 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 5190bfb6a665..9d4bd0d3a080 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -142,7 +142,7 @@ struct io_rings { */ u32 sq_dropped; /* - * Runtime flags + * Runtime SQ flags * * Written by the kernel, shouldn't be modified by the * application. @@ -152,6 +152,13 @@ struct io_rings { */ u32 sq_flags; /* + * Runtime CQ flags + * + * Written by the application, shouldn't be modified by the + * kernel. + */ + u32 cq_flags; + /* * Number of completion events lost because the queue was full; * this should be avoided by the application by making sure * there are not more requests pending than there is space in @@ -191,7 +198,7 @@ struct fixed_file_ref_node { struct list_head node; struct list_head file_list; struct fixed_file_data *file_data; - struct work_struct work; + struct llist_node llist; }; struct fixed_file_data { @@ -279,8 +286,8 @@ struct io_ring_ctx { const struct cred *creds; - /* 0 is for ctx quiesce/reinit/free, 1 is for sqo_thread started */ - struct completion *completions; + struct completion ref_comp; + struct completion sq_thread_comp; /* if all else fails... */ struct io_kiocb *fallback_req; @@ -327,6 +334,9 @@ struct io_ring_ctx { struct list_head inflight_list; } ____cacheline_aligned_in_smp; + struct delayed_work file_put_work; + struct llist_head file_put_llist; + struct work_struct exit_work; }; @@ -357,7 +367,6 @@ struct io_timeout_data { struct hrtimer timer; struct timespec64 ts; enum hrtimer_mode mode; - u32 seq_offset; }; struct io_accept { @@ -385,7 +394,8 @@ struct io_timeout { struct file *file; u64 addr; int flags; - unsigned count; + u32 off; + u32 target_seq; }; struct io_rw { @@ -416,11 +426,7 @@ struct io_sr_msg { struct io_open { struct file *file; int dfd; - union { - unsigned mask; - }; struct filename *filename; - struct statx __user *buffer; struct open_how how; unsigned long nofile; }; @@ -472,6 +478,15 @@ struct io_provide_buf { __u16 bid; }; +struct io_statx { + struct file *file; + int dfd; + unsigned int mask; + unsigned int flags; + const char __user *filename; + struct statx __user *buffer; +}; + struct io_async_connect { struct sockaddr_storage address; }; @@ -508,6 +523,7 @@ enum { REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, + REQ_F_LINK_HEAD_BIT, REQ_F_LINK_NEXT_BIT, REQ_F_FAIL_LINK_BIT, REQ_F_INFLIGHT_BIT, @@ -524,6 +540,7 @@ enum { REQ_F_OVERFLOW_BIT, REQ_F_POLLED_BIT, REQ_F_BUFFER_SELECTED_BIT, + REQ_F_NO_FILE_TABLE_BIT, /* not a real bit, just to check we're not overflowing the space */ __REQ_F_LAST_BIT, @@ -543,6 +560,8 @@ enum { /* IOSQE_BUFFER_SELECT */ REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), + /* head of a link */ + REQ_F_LINK_HEAD = BIT(REQ_F_LINK_HEAD_BIT), /* already grabbed next link */ REQ_F_LINK_NEXT = BIT(REQ_F_LINK_NEXT_BIT), /* fail rest of links */ @@ -575,6 +594,8 @@ enum { REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), /* buffer already selected */ REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), + /* doesn't need file table for this request */ + REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), }; struct async_poll { @@ -607,13 +628,15 @@ struct io_kiocb { struct io_epoll epoll; struct io_splice splice; struct io_provide_buf pbuf; + struct io_statx statx; }; struct io_async_ctx *io; int cflags; - bool needs_fixed_file; u8 opcode; + u16 buf_index; + struct io_ring_ctx *ctx; struct list_head list; unsigned int flags; @@ -675,8 +698,6 @@ struct io_op_def { unsigned needs_mm : 1; /* needs req->file assigned */ unsigned needs_file : 1; - /* needs req->file assigned IFF fd is >= 0 */ - unsigned fd_non_neg : 1; /* hash wq insertion if file is a regular file */ unsigned hash_reg_file : 1; /* unbound wq insertion if file is a non-regular file */ @@ -779,13 +800,10 @@ static const struct io_op_def io_op_defs[] = { .needs_file = 1, }, [IORING_OP_OPENAT] = { - .needs_file = 1, - .fd_non_neg = 1, .file_table = 1, .needs_fs = 1, }, [IORING_OP_CLOSE] = { - .needs_file = 1, .file_table = 1, }, [IORING_OP_FILES_UPDATE] = { @@ -794,9 +812,8 @@ static const struct io_op_def io_op_defs[] = { }, [IORING_OP_STATX] = { .needs_mm = 1, - .needs_file = 1, - .fd_non_neg = 1, .needs_fs = 1, + .file_table = 1, }, [IORING_OP_READ] = { .needs_mm = 1, @@ -831,8 +848,6 @@ static const struct io_op_def io_op_defs[] = { .buffer_select = 1, }, [IORING_OP_OPENAT2] = { - .needs_file = 1, - .fd_non_neg = 1, .file_table = 1, .needs_fs = 1, }, @@ -847,6 +862,11 @@ static const struct io_op_def io_op_defs[] = { }, [IORING_OP_PROVIDE_BUFFERS] = {}, [IORING_OP_REMOVE_BUFFERS] = {}, + [IORING_OP_TEE] = { + .needs_file = 1, + .hash_reg_file = 1, + .unbound_nonreg_file = 1, + }, }; static void io_wq_submit_work(struct io_wq_work **workptr); @@ -882,11 +902,18 @@ struct sock *io_uring_get_socket(struct file *file) } EXPORT_SYMBOL(io_uring_get_socket); +static void io_file_put_work(struct work_struct *work); + +static inline bool io_async_submit(struct io_ring_ctx *ctx) +{ + return ctx->flags & IORING_SETUP_SQPOLL; +} + static void io_ring_ctx_ref_free(struct percpu_ref *ref) { struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); - complete(&ctx->completions[0]); + complete(&ctx->ref_comp); } static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) @@ -902,10 +929,6 @@ static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) if (!ctx->fallback_req) goto err; - ctx->completions = kmalloc(2 * sizeof(struct completion), GFP_KERNEL); - if (!ctx->completions) - goto err; - /* * Use 5 bits less than the max cq entries, that should give us around * 32 entries per hash list if totally full and uniformly spread. @@ -926,10 +949,11 @@ static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) goto err; ctx->flags = p->flags; + init_waitqueue_head(&ctx->sqo_wait); init_waitqueue_head(&ctx->cq_wait); INIT_LIST_HEAD(&ctx->cq_overflow_list); - init_completion(&ctx->completions[0]); - init_completion(&ctx->completions[1]); + init_completion(&ctx->ref_comp); + init_completion(&ctx->sq_thread_comp); idr_init(&ctx->io_buffer_idr); idr_init(&ctx->personality_idr); mutex_init(&ctx->uring_lock); @@ -941,11 +965,12 @@ static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) init_waitqueue_head(&ctx->inflight_wait); spin_lock_init(&ctx->inflight_lock); INIT_LIST_HEAD(&ctx->inflight_list); + INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); + init_llist_head(&ctx->file_put_llist); return ctx; err: if (ctx->fallback_req) kmem_cache_free(req_cachep, ctx->fallback_req); - kfree(ctx->completions); kfree(ctx->cancel_hash); kfree(ctx); return NULL; @@ -955,8 +980,8 @@ static inline bool __req_need_defer(struct io_kiocb *req) { struct io_ring_ctx *ctx = req->ctx; - return req->sequence != ctx->cached_cq_tail + ctx->cached_sq_dropped - + atomic_read(&ctx->cached_cq_overflow); + return req->sequence != ctx->cached_cq_tail + + atomic_read(&ctx->cached_cq_overflow); } static inline bool req_need_defer(struct io_kiocb *req) @@ -967,36 +992,6 @@ static inline bool req_need_defer(struct io_kiocb *req) return false; } -static struct io_kiocb *io_get_deferred_req(struct io_ring_ctx *ctx) -{ - struct io_kiocb *req; - - req = list_first_entry_or_null(&ctx->defer_list, struct io_kiocb, list); - if (req && !req_need_defer(req)) { - list_del_init(&req->list); - return req; - } - - return NULL; -} - -static struct io_kiocb *io_get_timeout_req(struct io_ring_ctx *ctx) -{ - struct io_kiocb *req; - - req = list_first_entry_or_null(&ctx->timeout_list, struct io_kiocb, list); - if (req) { - if (req->flags & REQ_F_TIMEOUT_NOSEQ) - return NULL; - if (!__req_need_defer(req)) { - list_del_init(&req->list); - return req; - } - } - - return NULL; -} - static void __io_commit_cqring(struct io_ring_ctx *ctx) { struct io_rings *rings = ctx->rings; @@ -1112,17 +1107,43 @@ static void io_kill_timeouts(struct io_ring_ctx *ctx) spin_unlock_irq(&ctx->completion_lock); } -static void io_commit_cqring(struct io_ring_ctx *ctx) +static void __io_queue_deferred(struct io_ring_ctx *ctx) { - struct io_kiocb *req; + do { + struct io_kiocb *req = list_first_entry(&ctx->defer_list, + struct io_kiocb, list); - while ((req = io_get_timeout_req(ctx)) != NULL) + if (req_need_defer(req)) + break; + list_del_init(&req->list); + io_queue_async_work(req); + } while (!list_empty(&ctx->defer_list)); +} + +static void io_flush_timeouts(struct io_ring_ctx *ctx) +{ + while (!list_empty(&ctx->timeout_list)) { + struct io_kiocb *req = list_first_entry(&ctx->timeout_list, + struct io_kiocb, list); + + if (req->flags & REQ_F_TIMEOUT_NOSEQ) + break; + if (req->timeout.target_seq != ctx->cached_cq_tail + - atomic_read(&ctx->cq_timeouts)) + break; + + list_del_init(&req->list); io_kill_timeout(req); + } +} +static void io_commit_cqring(struct io_ring_ctx *ctx) +{ + io_flush_timeouts(ctx); __io_commit_cqring(ctx); - while ((req = io_get_deferred_req(ctx)) != NULL) - io_queue_async_work(req); + if (unlikely(!list_empty(&ctx->defer_list))) + __io_queue_deferred(ctx); } static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) @@ -1147,6 +1168,8 @@ static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) { if (!ctx->cq_ev_fd) return false; + if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) + return false; if (!ctx->eventfd_async) return true; return io_wq_current_is_worker(); @@ -1289,7 +1312,7 @@ static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) struct io_kiocb *req; req = ctx->fallback_req; - if (!test_and_set_bit_lock(0, (unsigned long *) ctx->fallback_req)) + if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) return req; return NULL; @@ -1376,7 +1399,7 @@ static void __io_free_req(struct io_kiocb *req) if (likely(!io_is_fallback_req(req))) kmem_cache_free(req_cachep, req); else - clear_bit_unlock(0, (unsigned long *) req->ctx->fallback_req); + clear_bit_unlock(0, (unsigned long *) &req->ctx->fallback_req); } struct req_batch { @@ -1396,10 +1419,6 @@ static void io_free_req_many(struct io_ring_ctx *ctx, struct req_batch *rb) for (i = 0; i < rb->to_free; i++) { struct io_kiocb *req = rb->reqs[i]; - if (req->flags & REQ_F_FIXED_FILE) { - req->file = NULL; - percpu_ref_put(req->fixed_file_refs); - } if (req->flags & REQ_F_INFLIGHT) inflight++; __io_req_aux_free(req); @@ -1437,7 +1456,7 @@ static bool io_link_cancel_timeout(struct io_kiocb *req) if (ret != -1) { io_cqring_fill_event(req, -ECANCELED); io_commit_cqring(ctx); - req->flags &= ~REQ_F_LINK; + req->flags &= ~REQ_F_LINK_HEAD; io_put_req(req); return true; } @@ -1473,7 +1492,7 @@ static void io_req_link_next(struct io_kiocb *req, struct io_kiocb **nxtptr) list_del_init(&req->link_list); if (!list_empty(&nxt->link_list)) - nxt->flags |= REQ_F_LINK; + nxt->flags |= REQ_F_LINK_HEAD; *nxtptr = nxt; break; } @@ -1484,7 +1503,7 @@ static void io_req_link_next(struct io_kiocb *req, struct io_kiocb **nxtptr) } /* - * Called if REQ_F_LINK is set, and we fail the head request + * Called if REQ_F_LINK_HEAD is set, and we fail the head request */ static void io_fail_links(struct io_kiocb *req) { @@ -1517,7 +1536,7 @@ static void io_fail_links(struct io_kiocb *req) static void io_req_find_next(struct io_kiocb *req, struct io_kiocb **nxt) { - if (likely(!(req->flags & REQ_F_LINK))) + if (likely(!(req->flags & REQ_F_LINK_HEAD))) return; /* @@ -1669,10 +1688,10 @@ static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) static inline bool io_req_multi_free(struct req_batch *rb, struct io_kiocb *req) { - if ((req->flags & REQ_F_LINK) || io_is_fallback_req(req)) + if ((req->flags & REQ_F_LINK_HEAD) || io_is_fallback_req(req)) return false; - if (!(req->flags & REQ_F_FIXED_FILE) || req->io) + if (req->file || req->io) rb->need_iter++; rb->reqs[rb->to_free++] = req; @@ -1987,15 +2006,19 @@ static void io_iopoll_req_issued(struct io_kiocb *req) wake_up(&ctx->sqo_wait); } -static void io_file_put(struct io_submit_state *state) +static void __io_state_file_put(struct io_submit_state *state) { - if (state->file) { - int diff = state->has_refs - state->used_refs; + int diff = state->has_refs - state->used_refs; - if (diff) - fput_many(state->file, diff); - state->file = NULL; - } + if (diff) + fput_many(state->file, diff); + state->file = NULL; +} + +static inline void io_state_file_put(struct io_submit_state *state) +{ + if (state->file) + __io_state_file_put(state); } /* @@ -2014,7 +2037,7 @@ static struct file *__io_file_get(struct io_submit_state *state, int fd) state->ios_left--; return state->file; } - io_file_put(state); + __io_state_file_put(state); } state->file = fget_many(fd, state->ios_left); if (!state->file) @@ -2032,7 +2055,7 @@ static struct file *__io_file_get(struct io_submit_state *state, int fd) * any file. For now, just ensure that anything potentially problematic is done * inline. */ -static bool io_file_supports_async(struct file *file) +static bool io_file_supports_async(struct file *file, int rw) { umode_t mode = file_inode(file)->i_mode; @@ -2041,7 +2064,13 @@ static bool io_file_supports_async(struct file *file) if (S_ISREG(mode) && file->f_op != &io_uring_fops) return true; - return false; + if (!(file->f_mode & FMODE_NOWAIT)) + return false; + + if (rw == READ) + return file->f_op->read_iter != NULL; + + return file->f_op->write_iter != NULL; } static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, @@ -2100,9 +2129,7 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, req->rw.addr = READ_ONCE(sqe->addr); req->rw.len = READ_ONCE(sqe->len); - /* we own ->private, reuse it for the buffer index / buffer ID */ - req->rw.kiocb.private = (void *) (unsigned long) - READ_ONCE(sqe->buf_index); + req->buf_index = READ_ONCE(sqe->buf_index); return 0; } @@ -2145,7 +2172,7 @@ static ssize_t io_import_fixed(struct io_kiocb *req, int rw, struct io_ring_ctx *ctx = req->ctx; size_t len = req->rw.len; struct io_mapped_ubuf *imu; - unsigned index, buf_index; + u16 index, buf_index; size_t offset; u64 buf_addr; @@ -2153,7 +2180,7 @@ static ssize_t io_import_fixed(struct io_kiocb *req, int rw, if (unlikely(!ctx->user_bufs)) return -EFAULT; - buf_index = (unsigned long) req->rw.kiocb.private; + buf_index = req->buf_index; if (unlikely(buf_index >= ctx->nr_user_bufs)) return -EFAULT; @@ -2269,10 +2296,10 @@ static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, bool needs_lock) { struct io_buffer *kbuf; - int bgid; + u16 bgid; kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; - bgid = (int) (unsigned long) req->rw.kiocb.private; + bgid = req->buf_index; kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); if (IS_ERR(kbuf)) return kbuf; @@ -2363,7 +2390,7 @@ static ssize_t io_import_iovec(int rw, struct io_kiocb *req, } /* buffer index only valid with fixed read/write, or buffer select */ - if (req->rw.kiocb.private && !(req->flags & REQ_F_BUFFER_SELECT)) + if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) return -EINVAL; if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { @@ -2562,14 +2589,14 @@ static int io_read(struct io_kiocb *req, bool force_nonblock) req->result = 0; io_size = ret; - if (req->flags & REQ_F_LINK) + if (req->flags & REQ_F_LINK_HEAD) req->result = io_size; /* * If the file doesn't support async, mark it as REQ_F_MUST_PUNT so * we know to async punt it even if it was opened O_NONBLOCK */ - if (force_nonblock && !io_file_supports_async(req->file)) + if (force_nonblock && !io_file_supports_async(req->file, READ)) goto copy_iov; iov_count = iov_iter_count(&iter); @@ -2592,7 +2619,8 @@ copy_iov: if (ret) goto out_free; /* any defer here is final, must blocking retry */ - if (!(req->flags & REQ_F_NOWAIT)) + if (!(req->flags & REQ_F_NOWAIT) && + !file_can_poll(req->file)) req->flags |= REQ_F_MUST_PUNT; return -EAGAIN; } @@ -2653,14 +2681,14 @@ static int io_write(struct io_kiocb *req, bool force_nonblock) req->result = 0; io_size = ret; - if (req->flags & REQ_F_LINK) + if (req->flags & REQ_F_LINK_HEAD) req->result = io_size; /* * If the file doesn't support async, mark it as REQ_F_MUST_PUNT so * we know to async punt it even if it was opened O_NONBLOCK */ - if (force_nonblock && !io_file_supports_async(req->file)) + if (force_nonblock && !io_file_supports_async(req->file, WRITE)) goto copy_iov; /* file path doesn't support NOWAIT for non-direct_IO */ @@ -2714,7 +2742,8 @@ copy_iov: if (ret) goto out_free; /* any defer here is final, must blocking retry */ - req->flags |= REQ_F_MUST_PUNT; + if (!file_can_poll(req->file)) + req->flags |= REQ_F_MUST_PUNT; return -EAGAIN; } } @@ -2724,7 +2753,8 @@ out_free: return ret; } -static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +static int __io_splice_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) { struct io_splice* sp = &req->splice; unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; @@ -2734,8 +2764,6 @@ static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) return 0; sp->file_in = NULL; - sp->off_in = READ_ONCE(sqe->splice_off_in); - sp->off_out = READ_ONCE(sqe->off); sp->len = READ_ONCE(sqe->len); sp->flags = READ_ONCE(sqe->splice_flags); @@ -2754,13 +2782,44 @@ static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) return 0; } -static bool io_splice_punt(struct file *file) +static int io_tee_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) { - if (get_pipe_info(file)) - return false; - if (!io_file_supports_async(file)) - return true; - return !(file->f_mode & O_NONBLOCK); + if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) + return -EINVAL; + return __io_splice_prep(req, sqe); +} + +static int io_tee(struct io_kiocb *req, bool force_nonblock) +{ + struct io_splice *sp = &req->splice; + struct file *in = sp->file_in; + struct file *out = sp->file_out; + unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; + long ret = 0; + + if (force_nonblock) + return -EAGAIN; + if (sp->len) + ret = do_tee(in, out, sp->len, flags); + + io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); + req->flags &= ~REQ_F_NEED_CLEANUP; + + io_cqring_add_event(req, ret); + if (ret != sp->len) + req_set_fail_links(req); + io_put_req(req); + return 0; +} + +static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_splice* sp = &req->splice; + + sp->off_in = READ_ONCE(sqe->splice_off_in); + sp->off_out = READ_ONCE(sqe->off); + return __io_splice_prep(req, sqe); } static int io_splice(struct io_kiocb *req, bool force_nonblock) @@ -2770,19 +2829,16 @@ static int io_splice(struct io_kiocb *req, bool force_nonblock) struct file *out = sp->file_out; unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; loff_t *poff_in, *poff_out; - long ret; + long ret = 0; - if (force_nonblock) { - if (io_splice_punt(in) || io_splice_punt(out)) - return -EAGAIN; - flags |= SPLICE_F_NONBLOCK; - } + if (force_nonblock) + return -EAGAIN; poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; - ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); - if (force_nonblock && ret == -EAGAIN) - return -EAGAIN; + + if (sp->len) + ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); req->flags &= ~REQ_F_NEED_CLEANUP; @@ -3314,71 +3370,35 @@ static int io_fadvise(struct io_kiocb *req, bool force_nonblock) static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { - const char __user *fname; - unsigned lookup_flags; - int ret; - if (sqe->ioprio || sqe->buf_index) return -EINVAL; if (req->flags & REQ_F_FIXED_FILE) return -EBADF; - if (req->flags & REQ_F_NEED_CLEANUP) - return 0; - req->open.dfd = READ_ONCE(sqe->fd); - req->open.mask = READ_ONCE(sqe->len); - fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); - req->open.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); - req->open.how.flags = READ_ONCE(sqe->statx_flags); - - if (vfs_stat_set_lookup_flags(&lookup_flags, req->open.how.flags)) - return -EINVAL; + req->statx.dfd = READ_ONCE(sqe->fd); + req->statx.mask = READ_ONCE(sqe->len); + req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); + req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); + req->statx.flags = READ_ONCE(sqe->statx_flags); - req->open.filename = getname_flags(fname, lookup_flags, NULL); - if (IS_ERR(req->open.filename)) { - ret = PTR_ERR(req->open.filename); - req->open.filename = NULL; - return ret; - } - - req->flags |= REQ_F_NEED_CLEANUP; return 0; } static int io_statx(struct io_kiocb *req, bool force_nonblock) { - struct io_open *ctx = &req->open; - unsigned lookup_flags; - struct path path; - struct kstat stat; + struct io_statx *ctx = &req->statx; int ret; - if (force_nonblock) + if (force_nonblock) { + /* only need file table for an actual valid fd */ + if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) + req->flags |= REQ_F_NO_FILE_TABLE; return -EAGAIN; + } - if (vfs_stat_set_lookup_flags(&lookup_flags, ctx->how.flags)) - return -EINVAL; - -retry: - /* filename_lookup() drops it, keep a reference */ - ctx->filename->refcnt++; + ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, + ctx->buffer); - ret = filename_lookup(ctx->dfd, ctx->filename, lookup_flags, &path, - NULL); - if (ret) - goto err; - - ret = vfs_getattr(&path, &stat, ctx->mask, ctx->how.flags); - path_put(&path); - if (retry_estale(ret, lookup_flags)) { - lookup_flags |= LOOKUP_REVAL; - goto retry; - } - if (!ret) - ret = cp_statx(&stat, ctx->buffer); -err: - putname(ctx->filename); - req->flags &= ~REQ_F_NEED_CLEANUP; if (ret < 0) req_set_fail_links(req); io_cqring_add_event(req, ret); @@ -3401,10 +3421,6 @@ static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) return -EBADF; req->close.fd = READ_ONCE(sqe->fd); - if (req->file->f_op == &io_uring_fops || - req->close.fd == req->ctx->ring_fd) - return -EBADF; - return 0; } @@ -3437,21 +3453,14 @@ static int io_close(struct io_kiocb *req, bool force_nonblock) req->close.put_file = NULL; ret = __close_fd_get_file(req->close.fd, &req->close.put_file); if (ret < 0) - return ret; + return (ret == -ENOENT) ? -EBADF : ret; /* if the file has a flush method, be safe and punt to async */ if (req->close.put_file->f_op->flush && force_nonblock) { - /* submission ref will be dropped, take it for async */ - refcount_inc(&req->refs); - + /* avoid grabbing files - we don't need the files */ + req->flags |= REQ_F_NO_FILE_TABLE | REQ_F_MUST_PUNT; req->work.func = io_close_finish; - /* - * Do manual async queue here to avoid grabbing files - we don't - * need the files, and it'll cause io_close_finish() to close - * the file again and cause a double CQE entry for this request - */ - io_queue_async_work(req); - return 0; + return -EAGAIN; } /* @@ -3500,7 +3509,7 @@ static void io_sync_file_range_finish(struct io_wq_work **workptr) if (io_req_cancelled(req)) return; __io_sync_file_range(req); - io_put_req(req); /* put submission ref */ + io_steal_work(req, workptr); } static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) @@ -4101,27 +4110,6 @@ struct io_poll_table { int error; }; -static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, - struct wait_queue_head *head) -{ - if (unlikely(poll->head)) { - pt->error = -EINVAL; - return; - } - - pt->error = 0; - poll->head = head; - add_wait_queue(head, &poll->wait); -} - -static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, - struct poll_table_struct *p) -{ - struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); - - __io_queue_proc(&pt->req->apoll->poll, pt, head); -} - static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, __poll_t mask, task_work_func_t func) { @@ -4140,12 +4128,14 @@ static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, req->result = mask; init_task_work(&req->task_work, func); /* - * If this fails, then the task is exiting. Punt to one of the io-wq - * threads to ensure the work gets run, we can't always rely on exit - * cancelation taking care of this. + * If this fails, then the task is exiting. When a task exits, the + * work gets canceled, so just cancel this request as well instead + * of executing it. We can't safely execute it anyway, as we may not + * have the needed state needed for it anyway. */ ret = task_work_add(tsk, &req->task_work, true); if (unlikely(ret)) { + WRITE_ONCE(poll->canceled, true); tsk = io_wq_get_task(req->ctx->io_wq); task_work_add(tsk, &req->task_work, true); } @@ -4153,31 +4143,205 @@ static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, return 1; } +static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) + __acquires(&req->ctx->completion_lock) +{ + struct io_ring_ctx *ctx = req->ctx; + + if (!req->result && !READ_ONCE(poll->canceled)) { + struct poll_table_struct pt = { ._key = poll->events }; + + req->result = vfs_poll(req->file, &pt) & poll->events; + } + + spin_lock_irq(&ctx->completion_lock); + if (!req->result && !READ_ONCE(poll->canceled)) { + add_wait_queue(poll->head, &poll->wait); + return true; + } + + return false; +} + +static void io_poll_remove_double(struct io_kiocb *req) +{ + struct io_poll_iocb *poll = (struct io_poll_iocb *) req->io; + + lockdep_assert_held(&req->ctx->completion_lock); + + if (poll && poll->head) { + struct wait_queue_head *head = poll->head; + + spin_lock(&head->lock); + list_del_init(&poll->wait.entry); + if (poll->wait.private) + refcount_dec(&req->refs); + poll->head = NULL; + spin_unlock(&head->lock); + } +} + +static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) +{ + struct io_ring_ctx *ctx = req->ctx; + + io_poll_remove_double(req); + req->poll.done = true; + io_cqring_fill_event(req, error ? error : mangle_poll(mask)); + io_commit_cqring(ctx); +} + +static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt) +{ + struct io_ring_ctx *ctx = req->ctx; + + if (io_poll_rewait(req, &req->poll)) { + spin_unlock_irq(&ctx->completion_lock); + return; + } + + hash_del(&req->hash_node); + io_poll_complete(req, req->result, 0); + req->flags |= REQ_F_COMP_LOCKED; + io_put_req_find_next(req, nxt); + spin_unlock_irq(&ctx->completion_lock); + + io_cqring_ev_posted(ctx); +} + +static void io_poll_task_func(struct callback_head *cb) +{ + struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); + struct io_kiocb *nxt = NULL; + + io_poll_task_handler(req, &nxt); + if (nxt) { + struct io_ring_ctx *ctx = nxt->ctx; + + mutex_lock(&ctx->uring_lock); + __io_queue_sqe(nxt, NULL); + mutex_unlock(&ctx->uring_lock); + } +} + +static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, + int sync, void *key) +{ + struct io_kiocb *req = wait->private; + struct io_poll_iocb *poll = (struct io_poll_iocb *) req->io; + __poll_t mask = key_to_poll(key); + + /* for instances that support it check for an event match first: */ + if (mask && !(mask & poll->events)) + return 0; + + if (req->poll.head) { + bool done; + + spin_lock(&req->poll.head->lock); + done = list_empty(&req->poll.wait.entry); + if (!done) + list_del_init(&req->poll.wait.entry); + spin_unlock(&req->poll.head->lock); + if (!done) + __io_async_wake(req, poll, mask, io_poll_task_func); + } + refcount_dec(&req->refs); + return 1; +} + +static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, + wait_queue_func_t wake_func) +{ + poll->head = NULL; + poll->done = false; + poll->canceled = false; + poll->events = events; + INIT_LIST_HEAD(&poll->wait.entry); + init_waitqueue_func_entry(&poll->wait, wake_func); +} + +static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, + struct wait_queue_head *head) +{ + struct io_kiocb *req = pt->req; + + /* + * If poll->head is already set, it's because the file being polled + * uses multiple waitqueues for poll handling (eg one for read, one + * for write). Setup a separate io_poll_iocb if this happens. + */ + if (unlikely(poll->head)) { + /* already have a 2nd entry, fail a third attempt */ + if (req->io) { + pt->error = -EINVAL; + return; + } + poll = kmalloc(sizeof(*poll), GFP_ATOMIC); + if (!poll) { + pt->error = -ENOMEM; + return; + } + io_init_poll_iocb(poll, req->poll.events, io_poll_double_wake); + refcount_inc(&req->refs); + poll->wait.private = req; + req->io = (void *) poll; + } + + pt->error = 0; + poll->head = head; + add_wait_queue(head, &poll->wait); +} + +static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, + struct poll_table_struct *p) +{ + struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); + + __io_queue_proc(&pt->req->apoll->poll, pt, head); +} + static void io_async_task_func(struct callback_head *cb) { struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); struct async_poll *apoll = req->apoll; struct io_ring_ctx *ctx = req->ctx; + bool canceled = false; trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); - WARN_ON_ONCE(!list_empty(&req->apoll->poll.wait.entry)); + if (io_poll_rewait(req, &apoll->poll)) { + spin_unlock_irq(&ctx->completion_lock); + return; + } + /* If req is still hashed, it cannot have been canceled. Don't check. */ if (hash_hashed(&req->hash_node)) { - spin_lock_irq(&ctx->completion_lock); hash_del(&req->hash_node); - spin_unlock_irq(&ctx->completion_lock); + } else { + canceled = READ_ONCE(apoll->poll.canceled); + if (canceled) { + io_cqring_fill_event(req, -ECANCELED); + io_commit_cqring(ctx); + } } + spin_unlock_irq(&ctx->completion_lock); + /* restore ->work in case we need to retry again */ memcpy(&req->work, &apoll->work, sizeof(req->work)); - - __set_current_state(TASK_RUNNING); - mutex_lock(&ctx->uring_lock); - __io_queue_sqe(req, NULL); - mutex_unlock(&ctx->uring_lock); - kfree(apoll); + + if (!canceled) { + __set_current_state(TASK_RUNNING); + mutex_lock(&ctx->uring_lock); + __io_queue_sqe(req, NULL); + mutex_unlock(&ctx->uring_lock); + } else { + io_cqring_ev_posted(ctx); + req_set_fail_links(req); + io_double_put_req(req); + } } static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, @@ -4211,18 +4375,13 @@ static __poll_t __io_arm_poll_handler(struct io_kiocb *req, bool cancel = false; poll->file = req->file; - poll->head = NULL; - poll->done = poll->canceled = false; - poll->events = mask; + io_init_poll_iocb(poll, mask, wake_func); + poll->wait.private = req; ipt->pt._key = mask; ipt->req = req; ipt->error = -EINVAL; - INIT_LIST_HEAD(&poll->wait.entry); - init_waitqueue_func_entry(&poll->wait, wake_func); - poll->wait.private = req; - mask = vfs_poll(req->file, &ipt->pt) & poll->events; spin_lock_irq(&ctx->completion_lock); @@ -4253,6 +4412,7 @@ static bool io_arm_poll_handler(struct io_kiocb *req) struct async_poll *apoll; struct io_poll_table ipt; __poll_t mask, ret; + bool had_io; if (!req->file || !file_can_poll(req->file)) return false; @@ -4267,6 +4427,7 @@ static bool io_arm_poll_handler(struct io_kiocb *req) req->flags |= REQ_F_POLLED; memcpy(&apoll->work, &req->work, sizeof(req->work)); + had_io = req->io != NULL; get_task_struct(current); req->task = current; @@ -4286,7 +4447,9 @@ static bool io_arm_poll_handler(struct io_kiocb *req) io_async_wake); if (ret) { ipt.error = 0; - apoll->poll.done = true; + /* only remove double add if we did it here */ + if (!had_io) + io_poll_remove_double(req); spin_unlock_irq(&ctx->completion_lock); memcpy(&req->work, &apoll->work, sizeof(req->work)); kfree(apoll); @@ -4310,6 +4473,7 @@ static bool __io_poll_remove_one(struct io_kiocb *req, do_complete = true; } spin_unlock(&poll->head->lock); + hash_del(&req->hash_node); return do_complete; } @@ -4318,16 +4482,25 @@ static bool io_poll_remove_one(struct io_kiocb *req) bool do_complete; if (req->opcode == IORING_OP_POLL_ADD) { + io_poll_remove_double(req); do_complete = __io_poll_remove_one(req, &req->poll); } else { + struct async_poll *apoll = req->apoll; + /* non-poll requests have submit ref still */ - do_complete = __io_poll_remove_one(req, &req->apoll->poll); - if (do_complete) + do_complete = __io_poll_remove_one(req, &apoll->poll); + if (do_complete) { io_put_req(req); + /* + * restore ->work because we will call + * io_req_work_drop_env below when dropping the + * final reference. + */ + memcpy(&req->work, &apoll->work, sizeof(req->work)); + kfree(apoll); + } } - hash_del(&req->hash_node); - if (do_complete) { io_cqring_fill_event(req, -ECANCELED); io_commit_cqring(req->ctx); @@ -4342,7 +4515,7 @@ static void io_poll_remove_all(struct io_ring_ctx *ctx) { struct hlist_node *tmp; struct io_kiocb *req; - int i; + int posted = 0, i; spin_lock_irq(&ctx->completion_lock); for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { @@ -4350,11 +4523,12 @@ static void io_poll_remove_all(struct io_ring_ctx *ctx) list = &ctx->cancel_hash[i]; hlist_for_each_entry_safe(req, tmp, list, hash_node) - io_poll_remove_one(req); + posted += io_poll_remove_one(req); } spin_unlock_irq(&ctx->completion_lock); - io_cqring_ev_posted(ctx); + if (posted) + io_cqring_ev_posted(ctx); } static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) @@ -4409,56 +4583,6 @@ static int io_poll_remove(struct io_kiocb *req) return 0; } -static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) -{ - struct io_ring_ctx *ctx = req->ctx; - - req->poll.done = true; - io_cqring_fill_event(req, error ? error : mangle_poll(mask)); - io_commit_cqring(ctx); -} - -static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt) -{ - struct io_ring_ctx *ctx = req->ctx; - struct io_poll_iocb *poll = &req->poll; - - if (!req->result && !READ_ONCE(poll->canceled)) { - struct poll_table_struct pt = { ._key = poll->events }; - - req->result = vfs_poll(req->file, &pt) & poll->events; - } - - spin_lock_irq(&ctx->completion_lock); - if (!req->result && !READ_ONCE(poll->canceled)) { - add_wait_queue(poll->head, &poll->wait); - spin_unlock_irq(&ctx->completion_lock); - return; - } - hash_del(&req->hash_node); - io_poll_complete(req, req->result, 0); - req->flags |= REQ_F_COMP_LOCKED; - io_put_req_find_next(req, nxt); - spin_unlock_irq(&ctx->completion_lock); - - io_cqring_ev_posted(ctx); -} - -static void io_poll_task_func(struct callback_head *cb) -{ - struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); - struct io_kiocb *nxt = NULL; - - io_poll_task_handler(req, &nxt); - if (nxt) { - struct io_ring_ctx *ctx = nxt->ctx; - - mutex_lock(&ctx->uring_lock); - __io_queue_sqe(nxt, NULL); - mutex_unlock(&ctx->uring_lock); - } -} - static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, void *key) { @@ -4538,20 +4662,8 @@ static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) * We could be racing with timeout deletion. If the list is empty, * then timeout lookup already found it and will be handling it. */ - if (!list_empty(&req->list)) { - struct io_kiocb *prev; - - /* - * Adjust the reqs sequence before the current one because it - * will consume a slot in the cq_ring and the cq_tail - * pointer will be increased, otherwise other timeout reqs may - * return in advance without waiting for enough wait_nr. - */ - prev = req; - list_for_each_entry_continue_reverse(prev, &ctx->timeout_list, list) - prev->sequence++; + if (!list_empty(&req->list)) list_del_init(&req->list); - } io_cqring_fill_event(req, -ETIME); io_commit_cqring(ctx); @@ -4631,18 +4743,19 @@ static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, { struct io_timeout_data *data; unsigned flags; + u32 off = READ_ONCE(sqe->off); if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) return -EINVAL; if (sqe->ioprio || sqe->buf_index || sqe->len != 1) return -EINVAL; - if (sqe->off && is_timeout_link) + if (off && is_timeout_link) return -EINVAL; flags = READ_ONCE(sqe->timeout_flags); if (flags & ~IORING_TIMEOUT_ABS) return -EINVAL; - req->timeout.count = READ_ONCE(sqe->off); + req->timeout.off = off; if (!req->io && io_alloc_async_ctx(req)) return -ENOMEM; @@ -4665,70 +4778,40 @@ static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, static int io_timeout(struct io_kiocb *req) { - unsigned count; struct io_ring_ctx *ctx = req->ctx; - struct io_timeout_data *data; + struct io_timeout_data *data = &req->io->timeout; struct list_head *entry; - unsigned span = 0; + u32 tail, off = req->timeout.off; - data = &req->io->timeout; + spin_lock_irq(&ctx->completion_lock); /* * sqe->off holds how many events that need to occur for this * timeout event to be satisfied. If it isn't set, then this is * a pure timeout request, sequence isn't used. */ - count = req->timeout.count; - if (!count) { + if (!off) { req->flags |= REQ_F_TIMEOUT_NOSEQ; - spin_lock_irq(&ctx->completion_lock); entry = ctx->timeout_list.prev; goto add; } - req->sequence = ctx->cached_sq_head + count - 1; - data->seq_offset = count; + tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); + req->timeout.target_seq = tail + off; /* * Insertion sort, ensuring the first entry in the list is always * the one we need first. */ - spin_lock_irq(&ctx->completion_lock); list_for_each_prev(entry, &ctx->timeout_list) { struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, list); - unsigned nxt_sq_head; - long long tmp, tmp_nxt; - u32 nxt_offset = nxt->io->timeout.seq_offset; if (nxt->flags & REQ_F_TIMEOUT_NOSEQ) continue; - - /* - * Since cached_sq_head + count - 1 can overflow, use type long - * long to store it. - */ - tmp = (long long)ctx->cached_sq_head + count - 1; - nxt_sq_head = nxt->sequence - nxt_offset + 1; - tmp_nxt = (long long)nxt_sq_head + nxt_offset - 1; - - /* - * cached_sq_head may overflow, and it will never overflow twice - * once there is some timeout req still be valid. - */ - if (ctx->cached_sq_head < nxt_sq_head) - tmp += UINT_MAX; - - if (tmp > tmp_nxt) + /* nxt.seq is behind @tail, otherwise would've been completed */ + if (off >= nxt->timeout.target_seq - tail) break; - - /* - * Sequence of reqs after the insert one and itself should - * be adjusted because each timeout req consumes a slot. - */ - span++; - nxt->sequence++; } - req->sequence -= span; add: list_add(&req->list, entry); data->timer.function = io_timeout_fn; @@ -4957,6 +5040,9 @@ static int io_req_defer_prep(struct io_kiocb *req, case IORING_OP_REMOVE_BUFFERS: ret = io_remove_buffers_prep(req, sqe); break; + case IORING_OP_TEE: + ret = io_tee_prep(req, sqe); + break; default: printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", req->opcode); @@ -4973,15 +5059,16 @@ static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) int ret; /* Still need defer if there is pending req in defer list. */ - if (!req_need_defer(req) && list_empty(&ctx->defer_list)) + if (!req_need_defer(req) && list_empty_careful(&ctx->defer_list)) return 0; - if (!req->io && io_alloc_async_ctx(req)) - return -EAGAIN; - - ret = io_req_defer_prep(req, sqe); - if (ret < 0) - return ret; + if (!req->io) { + if (io_alloc_async_ctx(req)) + return -EAGAIN; + ret = io_req_defer_prep(req, sqe); + if (ret < 0) + return ret; + } spin_lock_irq(&ctx->completion_lock); if (!req_need_defer(req) && list_empty(&ctx->defer_list)) { @@ -5026,10 +5113,9 @@ static void io_cleanup_req(struct io_kiocb *req) break; case IORING_OP_OPENAT: case IORING_OP_OPENAT2: - case IORING_OP_STATX: - putname(req->open.filename); break; case IORING_OP_SPLICE: + case IORING_OP_TEE: io_put_file(req, req->splice.file_in, (req->splice.flags & SPLICE_F_FD_IN_FIXED)); break; @@ -5260,6 +5346,14 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, } ret = io_remove_buffers(req, force_nonblock); break; + case IORING_OP_TEE: + if (sqe) { + ret = io_tee_prep(req, sqe); + if (ret < 0) + break; + } + ret = io_tee(req, force_nonblock); + break; default: ret = -EINVAL; break; @@ -5268,7 +5362,8 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, if (ret) return ret; - if (ctx->flags & IORING_SETUP_IOPOLL) { + /* If the op doesn't have a file, we're not polling for it */ + if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { const bool in_async = io_wq_current_is_worker(); if (req->result == -EAGAIN) @@ -5322,22 +5417,13 @@ static void io_wq_submit_work(struct io_wq_work **workptr) io_steal_work(req, workptr); } -static int io_req_needs_file(struct io_kiocb *req, int fd) -{ - if (!io_op_defs[req->opcode].needs_file) - return 0; - if ((fd == -1 || fd == AT_FDCWD) && io_op_defs[req->opcode].fd_non_neg) - return 0; - return 1; -} - static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, int index) { struct fixed_file_table *table; table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; - return table->files[index & IORING_FILE_TABLE_MASK];; + return table->files[index & IORING_FILE_TABLE_MASK]; } static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, @@ -5368,15 +5454,12 @@ static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, } static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, - int fd, unsigned int flags) + int fd) { bool fixed; - if (!io_req_needs_file(req, fd)) - return 0; - - fixed = (flags & IOSQE_FIXED_FILE); - if (unlikely(!fixed && req->needs_fixed_file)) + fixed = (req->flags & REQ_F_FIXED_FILE) != 0; + if (unlikely(!fixed && io_async_submit(req->ctx))) return -EBADF; return io_file_get(state, req, fd, &req->file, fixed); @@ -5387,7 +5470,7 @@ static int io_grab_files(struct io_kiocb *req) int ret = -EBADF; struct io_ring_ctx *ctx = req->ctx; - if (req->work.files) + if (req->work.files || (req->flags & REQ_F_NO_FILE_TABLE)) return 0; if (!ctx->ring_file) return -EBADF; @@ -5476,7 +5559,7 @@ static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) { struct io_kiocb *nxt; - if (!(req->flags & REQ_F_LINK)) + if (!(req->flags & REQ_F_LINK_HEAD)) return NULL; /* for polled retry, if flag is set, we already went through here */ if (req->flags & REQ_F_POLLED) @@ -5581,9 +5664,15 @@ fail_req: io_double_put_req(req); } } else if (req->flags & REQ_F_FORCE_ASYNC) { - ret = io_req_defer_prep(req, sqe); - if (unlikely(ret < 0)) - goto fail_req; + if (!req->io) { + ret = -EAGAIN; + if (io_alloc_async_ctx(req)) + goto fail_req; + ret = io_req_defer_prep(req, sqe); + if (unlikely(ret < 0)) + goto fail_req; + } + /* * Never try inline submit of IOSQE_ASYNC is set, go straight * to async execution. @@ -5604,54 +5693,11 @@ static inline void io_queue_link_head(struct io_kiocb *req) io_queue_sqe(req, NULL); } -#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ - IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ - IOSQE_BUFFER_SELECT) - -static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, - struct io_submit_state *state, struct io_kiocb **link) +static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, + struct io_kiocb **link) { struct io_ring_ctx *ctx = req->ctx; - unsigned int sqe_flags; - int ret, id, fd; - - sqe_flags = READ_ONCE(sqe->flags); - - /* enforce forwards compatibility on users */ - if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) { - ret = -EINVAL; - goto err_req; - } - - if ((sqe_flags & IOSQE_BUFFER_SELECT) && - !io_op_defs[req->opcode].buffer_select) { - ret = -EOPNOTSUPP; - goto err_req; - } - - id = READ_ONCE(sqe->personality); - if (id) { - req->work.creds = idr_find(&ctx->personality_idr, id); - if (unlikely(!req->work.creds)) { - ret = -EINVAL; - goto err_req; - } - get_cred(req->work.creds); - } - - /* same numerical values with corresponding REQ_F_*, safe to copy */ - req->flags |= sqe_flags & (IOSQE_IO_DRAIN | IOSQE_IO_HARDLINK | - IOSQE_ASYNC | IOSQE_FIXED_FILE | - IOSQE_BUFFER_SELECT); - - fd = READ_ONCE(sqe->fd); - ret = io_req_set_file(state, req, fd, sqe_flags); - if (unlikely(ret)) { -err_req: - io_cqring_add_event(req, ret); - io_double_put_req(req); - return false; - } + int ret; /* * If we already have a head request, queue this one for async @@ -5670,42 +5716,39 @@ err_req: * next after the link request. The last one is done via * drain_next flag to persist the effect across calls. */ - if (sqe_flags & IOSQE_IO_DRAIN) { + if (req->flags & REQ_F_IO_DRAIN) { head->flags |= REQ_F_IO_DRAIN; ctx->drain_next = 1; } - if (io_alloc_async_ctx(req)) { - ret = -EAGAIN; - goto err_req; - } + if (io_alloc_async_ctx(req)) + return -EAGAIN; ret = io_req_defer_prep(req, sqe); if (ret) { /* fail even hard links since we don't submit */ head->flags |= REQ_F_FAIL_LINK; - goto err_req; + return ret; } trace_io_uring_link(ctx, req, head); list_add_tail(&req->link_list, &head->link_list); /* last request of a link, enqueue the link */ - if (!(sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK))) { + if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { io_queue_link_head(head); *link = NULL; } } else { if (unlikely(ctx->drain_next)) { req->flags |= REQ_F_IO_DRAIN; - req->ctx->drain_next = 0; + ctx->drain_next = 0; } - if (sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) { - req->flags |= REQ_F_LINK; + if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { + req->flags |= REQ_F_LINK_HEAD; INIT_LIST_HEAD(&req->link_list); - if (io_alloc_async_ctx(req)) { - ret = -EAGAIN; - goto err_req; - } + if (io_alloc_async_ctx(req)) + return -EAGAIN; + ret = io_req_defer_prep(req, sqe); if (ret) req->flags |= REQ_F_FAIL_LINK; @@ -5715,7 +5758,7 @@ err_req: } } - return true; + return 0; } /* @@ -5724,7 +5767,7 @@ err_req: static void io_submit_state_end(struct io_submit_state *state) { blk_finish_plug(&state->plug); - io_file_put(state); + io_state_file_put(state); if (state->free_reqs) kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); } @@ -5789,15 +5832,23 @@ static inline void io_consume_sqe(struct io_ring_ctx *ctx) ctx->cached_sq_head++; } -static void io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, - const struct io_uring_sqe *sqe) +#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ + IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ + IOSQE_BUFFER_SELECT) + +static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, + const struct io_uring_sqe *sqe, + struct io_submit_state *state) { + unsigned int sqe_flags; + int id; + /* * All io need record the previous position, if LINK vs DARIN, * it can be used to mark the position of the first IO in the * link list. */ - req->sequence = ctx->cached_sq_head; + req->sequence = ctx->cached_sq_head - ctx->cached_sq_dropped; req->opcode = READ_ONCE(sqe->opcode); req->user_data = READ_ONCE(sqe->user_data); req->io = NULL; @@ -5809,16 +5860,48 @@ static void io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, req->task = NULL; req->result = 0; INIT_IO_WORK(&req->work, io_wq_submit_work); + + if (unlikely(req->opcode >= IORING_OP_LAST)) + return -EINVAL; + + if (io_op_defs[req->opcode].needs_mm && !current->mm) { + if (unlikely(!mmget_not_zero(ctx->sqo_mm))) + return -EFAULT; + use_mm(ctx->sqo_mm); + } + + sqe_flags = READ_ONCE(sqe->flags); + /* enforce forwards compatibility on users */ + if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) + return -EINVAL; + + if ((sqe_flags & IOSQE_BUFFER_SELECT) && + !io_op_defs[req->opcode].buffer_select) + return -EOPNOTSUPP; + + id = READ_ONCE(sqe->personality); + if (id) { + req->work.creds = idr_find(&ctx->personality_idr, id); + if (unlikely(!req->work.creds)) + return -EINVAL; + get_cred(req->work.creds); + } + + /* same numerical values with corresponding REQ_F_*, safe to copy */ + req->flags |= sqe_flags; + + if (!io_op_defs[req->opcode].needs_file) + return 0; + + return io_req_set_file(state, req, READ_ONCE(sqe->fd)); } static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, - struct file *ring_file, int ring_fd, - struct mm_struct **mm, bool async) + struct file *ring_file, int ring_fd) { struct io_submit_state state, *statep = NULL; struct io_kiocb *link = NULL; int i, submitted = 0; - bool mm_fault = false; /* if we have a backlog and couldn't flush it all, return BUSY */ if (test_bit(0, &ctx->sq_check_overflow)) { @@ -5858,34 +5941,23 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, break; } - io_init_req(ctx, req, sqe); + err = io_init_req(ctx, req, sqe, statep); io_consume_sqe(ctx); /* will complete beyond this point, count as submitted */ submitted++; - if (unlikely(req->opcode >= IORING_OP_LAST)) { - err = -EINVAL; + if (unlikely(err)) { fail_req: io_cqring_add_event(req, err); io_double_put_req(req); break; } - if (io_op_defs[req->opcode].needs_mm && !*mm) { - mm_fault = mm_fault || !mmget_not_zero(ctx->sqo_mm); - if (unlikely(mm_fault)) { - err = -EFAULT; - goto fail_req; - } - use_mm(ctx->sqo_mm); - *mm = ctx->sqo_mm; - } - - req->needs_fixed_file = async; trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, - true, async); - if (!io_submit_sqe(req, sqe, statep, &link)) - break; + true, io_async_submit(ctx)); + err = io_submit_sqe(req, sqe, &link); + if (err) + goto fail_req; } if (unlikely(submitted != nr)) { @@ -5904,17 +5976,26 @@ fail_req: return submitted; } +static inline void io_sq_thread_drop_mm(struct io_ring_ctx *ctx) +{ + struct mm_struct *mm = current->mm; + + if (mm) { + unuse_mm(mm); + mmput(mm); + } +} + static int io_sq_thread(void *data) { struct io_ring_ctx *ctx = data; - struct mm_struct *cur_mm = NULL; const struct cred *old_cred; mm_segment_t old_fs; DEFINE_WAIT(wait); unsigned long timeout; int ret = 0; - complete(&ctx->completions[1]); + complete(&ctx->sq_thread_comp); old_fs = get_fs(); set_fs(USER_DS); @@ -5948,11 +6029,7 @@ static int io_sq_thread(void *data) * adding ourselves to the waitqueue, as the unuse/drop * may sleep. */ - if (cur_mm) { - unuse_mm(cur_mm); - mmput(cur_mm); - cur_mm = NULL; - } + io_sq_thread_drop_mm(ctx); /* * We're polling. If we're within the defined idle @@ -6008,6 +6085,7 @@ static int io_sq_thread(void *data) finish_wait(&ctx->sqo_wait, &wait); ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; + ret = 0; continue; } finish_wait(&ctx->sqo_wait, &wait); @@ -6016,7 +6094,8 @@ static int io_sq_thread(void *data) } mutex_lock(&ctx->uring_lock); - ret = io_submit_sqes(ctx, to_submit, NULL, -1, &cur_mm, true); + if (likely(!percpu_ref_is_dying(&ctx->refs))) + ret = io_submit_sqes(ctx, to_submit, NULL, -1); mutex_unlock(&ctx->uring_lock); timeout = jiffies + ctx->sq_thread_idle; } @@ -6025,10 +6104,7 @@ static int io_sq_thread(void *data) task_work_run(); set_fs(old_fs); - if (cur_mm) { - unuse_mm(cur_mm); - mmput(cur_mm); - } + io_sq_thread_drop_mm(ctx); revert_creds(old_cred); kthread_parkme(); @@ -6167,22 +6243,22 @@ static int io_sqe_files_unregister(struct io_ring_ctx *ctx) struct fixed_file_data *data = ctx->file_data; struct fixed_file_ref_node *ref_node = NULL; unsigned nr_tables, i; - unsigned long flags; if (!data) return -ENXIO; - spin_lock_irqsave(&data->lock, flags); + spin_lock(&data->lock); if (!list_empty(&data->ref_list)) ref_node = list_first_entry(&data->ref_list, struct fixed_file_ref_node, node); - spin_unlock_irqrestore(&data->lock, flags); + spin_unlock(&data->lock); if (ref_node) percpu_ref_kill(&ref_node->refs); percpu_ref_kill(&data->refs); /* wait for all refs nodes to complete */ + flush_delayed_work(&ctx->file_put_work); wait_for_completion(&data->done); __io_sqe_files_unregister(ctx); @@ -6200,7 +6276,7 @@ static int io_sqe_files_unregister(struct io_ring_ctx *ctx) static void io_sq_thread_stop(struct io_ring_ctx *ctx) { if (ctx->sqo_thread) { - wait_for_completion(&ctx->completions[1]); + wait_for_completion(&ctx->sq_thread_comp); /* * The park is a bit of a work-around, without it we get * warning spews on shutdown with SQPOLL set and affinity @@ -6413,40 +6489,63 @@ struct io_file_put { struct file *file; }; -static void io_file_put_work(struct work_struct *work) +static void __io_file_put_work(struct fixed_file_ref_node *ref_node) { - struct fixed_file_ref_node *ref_node; - struct fixed_file_data *file_data; - struct io_ring_ctx *ctx; + struct fixed_file_data *file_data = ref_node->file_data; + struct io_ring_ctx *ctx = file_data->ctx; struct io_file_put *pfile, *tmp; - unsigned long flags; - - ref_node = container_of(work, struct fixed_file_ref_node, work); - file_data = ref_node->file_data; - ctx = file_data->ctx; list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { - list_del_init(&pfile->list); + list_del(&pfile->list); io_ring_file_put(ctx, pfile->file); kfree(pfile); } - spin_lock_irqsave(&file_data->lock, flags); - list_del_init(&ref_node->node); - spin_unlock_irqrestore(&file_data->lock, flags); + spin_lock(&file_data->lock); + list_del(&ref_node->node); + spin_unlock(&file_data->lock); percpu_ref_exit(&ref_node->refs); kfree(ref_node); percpu_ref_put(&file_data->refs); } +static void io_file_put_work(struct work_struct *work) +{ + struct io_ring_ctx *ctx; + struct llist_node *node; + + ctx = container_of(work, struct io_ring_ctx, file_put_work.work); + node = llist_del_all(&ctx->file_put_llist); + + while (node) { + struct fixed_file_ref_node *ref_node; + struct llist_node *next = node->next; + + ref_node = llist_entry(node, struct fixed_file_ref_node, llist); + __io_file_put_work(ref_node); + node = next; + } +} + static void io_file_data_ref_zero(struct percpu_ref *ref) { struct fixed_file_ref_node *ref_node; + struct io_ring_ctx *ctx; + bool first_add; + int delay = HZ; ref_node = container_of(ref, struct fixed_file_ref_node, refs); + ctx = ref_node->file_data->ctx; + + if (percpu_ref_is_dying(&ctx->file_data->refs)) + delay = 0; - queue_work(system_wq, &ref_node->work); + first_add = llist_add(&ref_node->llist, &ctx->file_put_llist); + if (!delay) + mod_delayed_work(system_wq, &ctx->file_put_work, 0); + else if (first_add) + queue_delayed_work(system_wq, &ctx->file_put_work, delay); } static struct fixed_file_ref_node *alloc_fixed_file_ref_node( @@ -6465,10 +6564,8 @@ static struct fixed_file_ref_node *alloc_fixed_file_ref_node( } INIT_LIST_HEAD(&ref_node->node); INIT_LIST_HEAD(&ref_node->file_list); - INIT_WORK(&ref_node->work, io_file_put_work); ref_node->file_data = ctx->file_data; return ref_node; - } static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) @@ -6486,7 +6583,6 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, int fd, ret = 0; unsigned i; struct fixed_file_ref_node *ref_node; - unsigned long flags; if (ctx->file_data) return -EBUSY; @@ -6594,9 +6690,9 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, } ctx->file_data->cur_refs = &ref_node->refs; - spin_lock_irqsave(&ctx->file_data->lock, flags); + spin_lock(&ctx->file_data->lock); list_add(&ref_node->node, &ctx->file_data->ref_list); - spin_unlock_irqrestore(&ctx->file_data->lock, flags); + spin_unlock(&ctx->file_data->lock); percpu_ref_get(&ctx->file_data->refs); return ret; } @@ -6672,7 +6768,6 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx, __s32 __user *fds; int fd, i, err; __u32 done; - unsigned long flags; bool needs_switch = false; if (check_add_overflow(up->offset, nr_args, &done)) @@ -6737,10 +6832,10 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx, if (needs_switch) { percpu_ref_kill(data->cur_refs); - spin_lock_irqsave(&data->lock, flags); + spin_lock(&data->lock); list_add(&ref_node->node, &data->ref_list); data->cur_refs = &ref_node->refs; - spin_unlock_irqrestore(&data->lock, flags); + spin_unlock(&data->lock); percpu_ref_get(&ctx->file_data->refs); } else destroy_fixed_file_ref_node(ref_node); @@ -6824,7 +6919,6 @@ static int io_sq_offload_start(struct io_ring_ctx *ctx, { int ret; - init_waitqueue_head(&ctx->sqo_wait); mmgrab(current->mm); ctx->sqo_mm = current->mm; @@ -7229,7 +7323,6 @@ static void io_ring_ctx_free(struct io_ring_ctx *ctx) ring_pages(ctx->sq_entries, ctx->cq_entries)); free_uid(ctx->user); put_cred(ctx->creds); - kfree(ctx->completions); kfree(ctx->cancel_hash); kmem_cache_free(req_cachep, ctx->fallback_req); kfree(ctx); @@ -7281,7 +7374,7 @@ static void io_ring_exit_work(struct work_struct *work) if (ctx->rings) io_cqring_overflow_flush(ctx, true); - wait_for_completion(&ctx->completions[0]); + wait_for_completion(&ctx->ref_comp); io_ring_ctx_free(ctx); } @@ -7291,16 +7384,6 @@ static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) percpu_ref_kill(&ctx->refs); mutex_unlock(&ctx->uring_lock); - /* - * Wait for sq thread to idle, if we have one. It won't spin on new - * work after we've killed the ctx ref above. This is important to do - * before we cancel existing commands, as the thread could otherwise - * be queueing new work post that. If that's work we need to cancel, - * it could cause shutdown to hang. - */ - while (ctx->sqo_thread && !wq_has_sleeper(&ctx->sqo_wait)) - cpu_relax(); - io_kill_timeouts(ctx); io_poll_remove_all(ctx); @@ -7328,11 +7411,9 @@ static int io_uring_release(struct inode *inode, struct file *file) static void io_uring_cancel_files(struct io_ring_ctx *ctx, struct files_struct *files) { - struct io_kiocb *req; - DEFINE_WAIT(wait); - while (!list_empty_careful(&ctx->inflight_list)) { - struct io_kiocb *cancel_req = NULL; + struct io_kiocb *cancel_req = NULL, *req; + DEFINE_WAIT(wait); spin_lock_irq(&ctx->inflight_lock); list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { @@ -7371,16 +7452,18 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx, * all we had, then we're done with this request. */ if (refcount_sub_and_test(2, &cancel_req->refs)) { - io_put_req(cancel_req); + io_free_req(cancel_req); + finish_wait(&ctx->inflight_wait, &wait); continue; } + } else { + io_wq_cancel_work(ctx->io_wq, &cancel_req->work); + io_put_req(cancel_req); } - io_wq_cancel_work(ctx->io_wq, &cancel_req->work); - io_put_req(cancel_req); schedule(); + finish_wait(&ctx->inflight_wait, &wait); } - finish_wait(&ctx->inflight_wait, &wait); } static int io_uring_flush(struct file *file, void *data) @@ -7509,13 +7592,8 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, wake_up(&ctx->sqo_wait); submitted = to_submit; } else if (to_submit) { - struct mm_struct *cur_mm; - mutex_lock(&ctx->uring_lock); - /* already have mm, so io_submit_sqes() won't try to grab it */ - cur_mm = ctx->sqo_mm; - submitted = io_submit_sqes(ctx, to_submit, f.file, fd, - &cur_mm, false); + submitted = io_submit_sqes(ctx, to_submit, f.file, fd); mutex_unlock(&ctx->uring_lock); if (submitted != to_submit) @@ -7734,7 +7812,8 @@ err: return ret; } -static int io_uring_create(unsigned entries, struct io_uring_params *p) +static int io_uring_create(unsigned entries, struct io_uring_params *p, + struct io_uring_params __user *params) { struct user_struct *user = NULL; struct io_ring_ctx *ctx; @@ -7825,7 +7904,16 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p) p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); p->cq_off.cqes = offsetof(struct io_rings, cqes); + p->cq_off.flags = offsetof(struct io_rings, cq_flags); + + p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | + IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | + IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL; + if (copy_to_user(params, p, sizeof(*p))) { + ret = -EFAULT; + goto err; + } /* * Install ring fd as the very last thing, so we don't risk someone * having closed it before we finish setup @@ -7834,9 +7922,6 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p) if (ret < 0) goto err; - p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | - IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | - IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL; trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); return ret; err: @@ -7852,7 +7937,6 @@ err: static long io_uring_setup(u32 entries, struct io_uring_params __user *params) { struct io_uring_params p; - long ret; int i; if (copy_from_user(&p, params, sizeof(p))) @@ -7867,14 +7951,7 @@ static long io_uring_setup(u32 entries, struct io_uring_params __user *params) IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ)) return -EINVAL; - ret = io_uring_create(entries, &p); - if (ret < 0) - return ret; - - if (copy_to_user(params, &p, sizeof(p))) - return -EFAULT; - - return ret; + return io_uring_create(entries, &p, params); } SYSCALL_DEFINE2(io_uring_setup, u32, entries, @@ -7988,7 +8065,7 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, * after we've killed the percpu ref. */ mutex_unlock(&ctx->uring_lock); - ret = wait_for_completion_interruptible(&ctx->completions[0]); + ret = wait_for_completion_interruptible(&ctx->ref_comp); mutex_lock(&ctx->uring_lock); if (ret) { percpu_ref_resurrect(&ctx->refs); @@ -8065,7 +8142,7 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, /* bring the ctx back to life */ percpu_ref_reinit(&ctx->refs); out: - reinit_completion(&ctx->completions[0]); + reinit_completion(&ctx->ref_comp); } return ret; } |