From mboxrd@z Thu Jan 1 00:00:00 1970 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 6A44AC636CD for ; Fri, 10 Feb 2023 15:33:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232578AbjBJPda (ORCPT ); Fri, 10 Feb 2023 10:33:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33524 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231517AbjBJPd3 (ORCPT ); Fri, 10 Feb 2023 10:33:29 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 48F105AB23 for ; Fri, 10 Feb 2023 07:32:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1676043161; 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; bh=BylpAHJhBQbW5HRA2ArLH6MZWqyqiWhscbiNJfHnoXw=; b=JvNsGlQvB9GxGfnSfiethkqLZVkZ/mx14+mO008FpDwN9CBoJklKVcVfRm+8Hyillt9jFn T+OX/CUS7rXmXXqYP77TmwgTSNumoola0hRvSI0xoyW6Yw9vEMgg6EAtMeCuP0Y1byO5e5 hvciujgA9THnETJljeKQKwtlONSx3iA= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-515-379S1MqcNjaH-3Al0vMLJA-1; Fri, 10 Feb 2023 10:32:38 -0500 X-MC-Unique: 379S1MqcNjaH-3Al0vMLJA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 735FE857F45; Fri, 10 Feb 2023 15:32:36 +0000 (UTC) Received: from localhost (ovpn-8-17.pek2.redhat.com [10.72.8.17]) by smtp.corp.redhat.com (Postfix) with ESMTP id 007492166B29; Fri, 10 Feb 2023 15:32:34 +0000 (UTC) From: Ming Lei To: Jens Axboe , io-uring@vger.kernel.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, Alexander Viro Cc: Stefan Hajnoczi , Miklos Szeredi , Bernd Schubert , Nitesh Shetty , Christoph Hellwig , Ziyang Zhang , Ming Lei Subject: [PATCH 0/4] io_uring: add IORING_OP_READ[WRITE]_SPLICE_BUF Date: Fri, 10 Feb 2023 23:32:08 +0800 Message-Id: <20230210153212.733006-1-ming.lei@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Hello, Add two OPs which buffer is retrieved via kernel splice for supporting fuse/ublk zero copy. The 1st patch enhances direct pipe & splice for moving pages in kernel, so that the two added OPs won't be misused, and avoid potential security hole. The 2nd patch allows splice_direct_to_actor() caller to ignore signal if the actor won't block and can be done in bound time. The 3rd patch add the two OPs. The 4th patch implements ublk's ->splice_read() for supporting zero copy. ublksrv(userspace): https://github.com/ming1/ubdsrv/commits/io_uring_splice_buf So far, only loop/null target implements zero copy in above branch: ublk add -t loop -f $file -z ublk add -t none -z Basic FS/IO function is verified, mount/kernel building & fio works fine, and big chunk IO(BS: 64k/512k) performance gets improved obviously. Any comment is welcome! Ming Lei (4): fs/splice: enhance direct pipe & splice for moving pages in kernel fs/splice: allow to ignore signal in __splice_from_pipe io_uring: add IORING_OP_READ[WRITE]_SPLICE_BUF ublk_drv: support splice based read/write zero copy drivers/block/ublk_drv.c | 169 +++++++++++++++++++++++++++++++-- fs/splice.c | 19 +++- include/linux/pipe_fs_i.h | 10 ++ include/linux/splice.h | 23 +++++ include/uapi/linux/io_uring.h | 2 + include/uapi/linux/ublk_cmd.h | 31 +++++- io_uring/opdef.c | 37 ++++++++ io_uring/rw.c | 174 +++++++++++++++++++++++++++++++++- io_uring/rw.h | 1 + 9 files changed, 456 insertions(+), 10 deletions(-) -- 2.31.1