From patchwork Tue Jun 7 08:06:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Xu X-Patchwork-Id: 12871492 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BFFEEC433EF for ; Tue, 7 Jun 2022 08:07:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238030AbiFGIGz (ORCPT ); Tue, 7 Jun 2022 04:06:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44162 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238026AbiFGIGt (ORCPT ); Tue, 7 Jun 2022 04:06:49 -0400 Received: from out1.migadu.com (out1.migadu.com [91.121.223.63]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6EFCDB82DB; Tue, 7 Jun 2022 01:06:48 -0700 (PDT) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1654589207; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=85yunG6FCrDcuT7+AlR9B02vmXCSLoT2S/bCbJh6Eoo=; b=F2AZVzG1VGSPcnSdb/vki/pj0dFYUI9+21bomBczREqoo/DI5hF14cPAKc7MbYG21n5XSw BPFB26WQVzDq5Twilj0JJ4YMbQcUN3KahEB8/0TVq5PuasA7SRuFpRYcPLT9ZGosiGP+JW seCbtSx6tvG+Zg88r5JDOE/wR4bLLcc= From: Hao Xu To: io-uring@vger.kernel.org Cc: Jens Axboe , Pavel Begunkov , linux-fsdevel@vger.kernel.org, Alexander Viro , Andrew Morton , Luis Chamberlain , Kuniyuki Iwashima Subject: [PATCH 4/5] io_uring: support nonblock try for splicing from pipe to pipe Date: Tue, 7 Jun 2022 16:06:18 +0800 Message-Id: <20220607080619.513187-5-hao.xu@linux.dev> In-Reply-To: <20220607080619.513187-1-hao.xu@linux.dev> References: <20220607080619.513187-1-hao.xu@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Hao Xu splice() in io_uring is running in a slow way since it fully depends on io workers. While splicing from pipe to pipe is a simpler case compared with file to pipe and pipe to file. Let's make it support nonblock first. This way we get a fast path for splicing fom pipe to pipe. Signed-off-by: Hao Xu Reported-by: kernel test robot Reported-by: kernel test robot Reported-by: kernel test robot --- io_uring/splice.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/io_uring/splice.c b/io_uring/splice.c index b2cd1044c3ee..650c70e3dde1 100644 --- a/io_uring/splice.c +++ b/io_uring/splice.c @@ -88,6 +88,14 @@ int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) return __io_splice_prep(req, sqe); } +bool io_splice_support_nowait(struct file *in, struct file *out) +{ + if (get_pipe_info(in, true) && get_pipe_info(out, true)) + return true; + + return false; +} + int io_splice(struct io_kiocb *req, unsigned int issue_flags) { struct io_splice *sp = io_kiocb_to_cmd(req); @@ -100,9 +108,6 @@ int io_splice(struct io_kiocb *req, unsigned int issue_flags) if (unlikely(!sp->len)) goto done; - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - if (sp->flags & SPLICE_F_FD_IN_FIXED) in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags); else @@ -112,6 +117,16 @@ int io_splice(struct io_kiocb *req, unsigned int issue_flags) goto done; } + if (issue_flags & IO_URING_F_NONBLOCK) { + if (io_splice_support_nowait(in, out)) { + flags |= SPLICE_F_NONBLOCK; + } else { + if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) + io_put_file(in); + return -EAGAIN; + } + } + poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; @@ -119,6 +134,9 @@ int io_splice(struct io_kiocb *req, unsigned int issue_flags) if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) io_put_file(in); + if (ret == -EAGAIN) + return ret; + done: if (ret != sp->len) req_set_fail(req);