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author | Mark Brown <broonie@kernel.org> | 2020-10-06 16:19:24 +0100 |
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committer | Mark Brown <broonie@kernel.org> | 2020-10-06 16:19:24 +0100 |
commit | fd6b519a30a7179026d22c98d6bf10bb5ca8ca27 (patch) | |
tree | e4a6bc4d8548a5b8db7148a18eb257b84e72d48b /fs/io_uring.c | |
parent | 43499134f50a77844f0503df2c995f43b858f4c3 (diff) | |
parent | 856deb866d16e29bd65952e0289066f6078af773 (diff) | |
download | linux-stable-fd6b519a30a7179026d22c98d6bf10bb5ca8ca27.tar.gz linux-stable-fd6b519a30a7179026d22c98d6bf10bb5ca8ca27.tar.bz2 linux-stable-fd6b519a30a7179026d22c98d6bf10bb5ca8ca27.zip |
Merge tag 'v5.9-rc5' into asoc-5.10
Linux 5.9-rc5
Diffstat (limited to 'fs/io_uring.c')
-rw-r--r-- | fs/io_uring.c | 169 |
1 files changed, 122 insertions, 47 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 91e2cc8414f9..3790c7fe9fee 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1150,7 +1150,7 @@ static void io_prep_async_work(struct io_kiocb *req) io_req_init_async(req); if (req->flags & REQ_F_ISREG) { - if (def->hash_reg_file) + if (def->hash_reg_file || (req->ctx->flags & IORING_SETUP_IOPOLL)) io_wq_hash_work(&req->work, file_inode(req->file)); } else { if (def->unbound_nonreg_file) @@ -1746,7 +1746,8 @@ static struct io_kiocb *io_req_find_next(struct io_kiocb *req) return __io_req_find_next(req); } -static int io_req_task_work_add(struct io_kiocb *req, struct callback_head *cb) +static int io_req_task_work_add(struct io_kiocb *req, struct callback_head *cb, + bool twa_signal_ok) { struct task_struct *tsk = req->task; struct io_ring_ctx *ctx = req->ctx; @@ -1759,7 +1760,7 @@ static int io_req_task_work_add(struct io_kiocb *req, struct callback_head *cb) * will do the job. */ notify = 0; - if (!(ctx->flags & IORING_SETUP_SQPOLL)) + if (!(ctx->flags & IORING_SETUP_SQPOLL) && twa_signal_ok) notify = TWA_SIGNAL; ret = task_work_add(tsk, cb, notify); @@ -1819,7 +1820,7 @@ static void io_req_task_queue(struct io_kiocb *req) init_task_work(&req->task_work, io_req_task_submit); percpu_ref_get(&req->ctx->refs); - ret = io_req_task_work_add(req, &req->task_work); + ret = io_req_task_work_add(req, &req->task_work, true); if (unlikely(ret)) { struct task_struct *tsk; @@ -2048,6 +2049,7 @@ static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, req = list_first_entry(done, struct io_kiocb, inflight_entry); if (READ_ONCE(req->result) == -EAGAIN) { + req->result = 0; req->iopoll_completed = 0; list_move_tail(&req->inflight_entry, &again); continue; @@ -2293,38 +2295,27 @@ end_req: io_req_complete(req, ret); return false; } - -static void io_rw_resubmit(struct callback_head *cb) -{ - struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); - struct io_ring_ctx *ctx = req->ctx; - int err; - - err = io_sq_thread_acquire_mm(ctx, req); - - if (io_resubmit_prep(req, err)) { - refcount_inc(&req->refs); - io_queue_async_work(req); - } - - percpu_ref_put(&ctx->refs); -} #endif static bool io_rw_reissue(struct io_kiocb *req, long res) { #ifdef CONFIG_BLOCK + umode_t mode = file_inode(req->file)->i_mode; int ret; + if (!S_ISBLK(mode) && !S_ISREG(mode)) + return false; if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) return false; - init_task_work(&req->task_work, io_rw_resubmit); - percpu_ref_get(&req->ctx->refs); + ret = io_sq_thread_acquire_mm(req->ctx, req); - ret = io_req_task_work_add(req, &req->task_work); - if (!ret) + if (io_resubmit_prep(req, ret)) { + refcount_inc(&req->refs); + io_queue_async_work(req); return true; + } + #endif return false; } @@ -2563,7 +2554,7 @@ static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) * IO with EINTR. */ ret = -EINTR; - /* fall through */ + fallthrough; default: kiocb->ki_complete(kiocb, ret, 0); } @@ -2865,6 +2856,11 @@ static ssize_t io_import_iovec(int rw, struct io_kiocb *req, return iov_iter_count(&req->io->rw.iter); } +static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) +{ + return kiocb->ki_filp->f_mode & FMODE_STREAM ? NULL : &kiocb->ki_pos; +} + /* * For files that don't have ->read_iter() and ->write_iter(), handle them * by looping over ->read() or ->write() manually. @@ -2900,10 +2896,10 @@ static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, if (rw == READ) { nr = file->f_op->read(file, iovec.iov_base, - iovec.iov_len, &kiocb->ki_pos); + iovec.iov_len, io_kiocb_ppos(kiocb)); } else { nr = file->f_op->write(file, iovec.iov_base, - iovec.iov_len, &kiocb->ki_pos); + iovec.iov_len, io_kiocb_ppos(kiocb)); } if (iov_iter_is_bvec(iter)) @@ -2984,14 +2980,15 @@ static inline int io_rw_prep_async(struct io_kiocb *req, int rw, bool force_nonblock) { struct io_async_rw *iorw = &req->io->rw; + struct iovec *iov; ssize_t ret; - iorw->iter.iov = iorw->fast_iov; - ret = __io_import_iovec(rw, req, (struct iovec **) &iorw->iter.iov, - &iorw->iter, !force_nonblock); + iorw->iter.iov = iov = iorw->fast_iov; + ret = __io_import_iovec(rw, req, &iov, &iorw->iter, !force_nonblock); if (unlikely(ret < 0)) return ret; + iorw->iter.iov = iov; io_req_map_rw(req, iorw->iter.iov, iorw->fast_iov, &iorw->iter); return 0; } @@ -3044,7 +3041,7 @@ static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, /* submit ref gets dropped, acquire a new one */ refcount_inc(&req->refs); - ret = io_req_task_work_add(req, &req->task_work); + ret = io_req_task_work_add(req, &req->task_work, true); if (unlikely(ret)) { struct task_struct *tsk; @@ -3125,6 +3122,7 @@ static int io_read(struct io_kiocb *req, bool force_nonblock, ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); if (ret < 0) return ret; + iov_count = iov_iter_count(iter); io_size = ret; req->result = io_size; ret = 0; @@ -3137,8 +3135,7 @@ static int io_read(struct io_kiocb *req, bool force_nonblock, if (force_nonblock && !io_file_supports_async(req->file, READ)) goto copy_iov; - iov_count = iov_iter_count(iter); - ret = rw_verify_area(READ, req->file, &kiocb->ki_pos, iov_count); + ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), iov_count); if (unlikely(ret)) goto out_free; @@ -3150,14 +3147,21 @@ static int io_read(struct io_kiocb *req, bool force_nonblock, ret = 0; goto out_free; } else if (ret == -EAGAIN) { - if (!force_nonblock) + /* IOPOLL retry should happen for io-wq threads */ + if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) + goto done; + /* no retry on NONBLOCK marked file */ + if (req->file->f_flags & O_NONBLOCK) goto done; + /* some cases will consume bytes even on error returns */ + iov_iter_revert(iter, iov_count - iov_iter_count(iter)); ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); if (ret) goto out_free; return -EAGAIN; } else if (ret < 0) { - goto out_free; + /* make sure -ERESTARTSYS -> -EINTR is done */ + goto done; } /* read it all, or we did blocking attempt. no retry. */ @@ -3241,6 +3245,7 @@ static int io_write(struct io_kiocb *req, bool force_nonblock, ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); if (ret < 0) return ret; + iov_count = iov_iter_count(iter); io_size = ret; req->result = io_size; @@ -3257,8 +3262,7 @@ static int io_write(struct io_kiocb *req, bool force_nonblock, (req->flags & REQ_F_ISREG)) goto copy_iov; - iov_count = iov_iter_count(iter); - ret = rw_verify_area(WRITE, req->file, &kiocb->ki_pos, iov_count); + ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), iov_count); if (unlikely(ret)) goto out_free; @@ -3290,10 +3294,19 @@ static int io_write(struct io_kiocb *req, bool force_nonblock, */ if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) ret2 = -EAGAIN; + /* no retry on NONBLOCK marked file */ + if (ret2 == -EAGAIN && (req->file->f_flags & O_NONBLOCK)) + goto done; if (!force_nonblock || ret2 != -EAGAIN) { + /* IOPOLL retry should happen for io-wq threads */ + if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) + goto copy_iov; +done: kiocb_done(kiocb, ret2, cs); } else { copy_iov: + /* some cases will consume bytes even on error returns */ + iov_iter_revert(iter, iov_count - iov_iter_count(iter)); ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); if (!ret) return -EAGAIN; @@ -4566,6 +4579,7 @@ struct io_poll_table { static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, __poll_t mask, task_work_func_t func) { + bool twa_signal_ok; int ret; /* for instances that support it check for an event match first: */ @@ -4581,12 +4595,20 @@ static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, percpu_ref_get(&req->ctx->refs); /* + * If we using the signalfd wait_queue_head for this wakeup, then + * it's not safe to use TWA_SIGNAL as we could be recursing on the + * tsk->sighand->siglock on doing the wakeup. Should not be needed + * either, as the normal wakeup will suffice. + */ + twa_signal_ok = (poll->head != &req->task->sighand->signalfd_wqh); + + /* * 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 = io_req_task_work_add(req, &req->task_work); + ret = io_req_task_work_add(req, &req->task_work, twa_signal_ok); if (unlikely(ret)) { struct task_struct *tsk; @@ -4875,12 +4897,20 @@ static bool io_arm_poll_handler(struct io_kiocb *req) struct async_poll *apoll; struct io_poll_table ipt; __poll_t mask, ret; + int rw; if (!req->file || !file_can_poll(req->file)) return false; if (req->flags & REQ_F_POLLED) return false; - if (!def->pollin && !def->pollout) + if (def->pollin) + rw = READ; + else if (def->pollout) + rw = WRITE; + else + return false; + /* if we can't nonblock try, then no point in arming a poll handler */ + if (!io_file_supports_async(req->file, rw)) return false; apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); @@ -7305,7 +7335,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx, table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; index = i & IORING_FILE_TABLE_MASK; if (table->files[index]) { - file = io_file_from_index(ctx, index); + file = table->files[index]; err = io_queue_file_removal(data, file); if (err) break; @@ -7334,6 +7364,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx, table->files[index] = file; err = io_sqe_file_register(ctx, file, i); if (err) { + table->files[index] = NULL; fput(file); break; } @@ -7433,9 +7464,6 @@ static int io_sq_offload_start(struct io_ring_ctx *ctx, { int ret; - mmgrab(current->mm); - ctx->sqo_mm = current->mm; - if (ctx->flags & IORING_SETUP_SQPOLL) { ret = -EPERM; if (!capable(CAP_SYS_ADMIN)) @@ -7480,10 +7508,6 @@ static int io_sq_offload_start(struct io_ring_ctx *ctx, return 0; err: io_finish_async(ctx); - if (ctx->sqo_mm) { - mmdrop(ctx->sqo_mm); - ctx->sqo_mm = NULL; - } return ret; } @@ -8000,6 +8024,28 @@ static bool io_match_link(struct io_kiocb *preq, struct io_kiocb *req) return false; } +static inline bool io_match_files(struct io_kiocb *req, + struct files_struct *files) +{ + return (req->flags & REQ_F_WORK_INITIALIZED) && req->work.files == files; +} + +static bool io_match_link_files(struct io_kiocb *req, + struct files_struct *files) +{ + struct io_kiocb *link; + + if (io_match_files(req, files)) + return true; + if (req->flags & REQ_F_LINK_HEAD) { + list_for_each_entry(link, &req->link_list, link_list) { + if (io_match_files(link, files)) + return true; + } + } + return false; +} + /* * We're looking to cancel 'req' because it's holding on to our files, but * 'req' could be a link to another request. See if it is, and cancel that @@ -8074,12 +8120,38 @@ static void io_attempt_cancel(struct io_ring_ctx *ctx, struct io_kiocb *req) io_timeout_remove_link(ctx, req); } +static void io_cancel_defer_files(struct io_ring_ctx *ctx, + struct files_struct *files) +{ + struct io_defer_entry *de = NULL; + LIST_HEAD(list); + + spin_lock_irq(&ctx->completion_lock); + list_for_each_entry_reverse(de, &ctx->defer_list, list) { + if (io_match_link_files(de->req, files)) { + list_cut_position(&list, &ctx->defer_list, &de->list); + break; + } + } + spin_unlock_irq(&ctx->completion_lock); + + while (!list_empty(&list)) { + de = list_first_entry(&list, struct io_defer_entry, list); + list_del_init(&de->list); + req_set_fail_links(de->req); + io_put_req(de->req); + io_req_complete(de->req, -ECANCELED); + kfree(de); + } +} + static void io_uring_cancel_files(struct io_ring_ctx *ctx, struct files_struct *files) { if (list_empty_careful(&ctx->inflight_list)) return; + io_cancel_defer_files(ctx, files); /* cancel all at once, should be faster than doing it one by one*/ io_wq_cancel_cb(ctx->io_wq, io_wq_files_match, files, true); @@ -8533,6 +8605,9 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p, ctx->user = user; ctx->creds = get_current_cred(); + mmgrab(current->mm); + ctx->sqo_mm = current->mm; + /* * Account memory _before_ installing the file descriptor. Once * the descriptor is installed, it can get closed at any time. Also |