From nobody Mon Feb 9 21:02:54 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1576174348; cv=none; d=zohomail.com; s=zohoarc; b=mkav9s0Ja3Wjtrzwo7dU/73NTY9h1fmoe461EdWXgqMqAAtmI4ftwelKS5GsUz3FWCW9fgu0cYQcbYA16Gne06LuB3IPRmDnGYwFmpuZT8wGklnheMJIFRlpr7GhDs/Vo3F6c9t88d35PBDBdWy3qnyonC3xOouFiV6EunyvqR4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1576174348; h=Content-Type:Content-Transfer-Encoding:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=vFc4dMo8yhjVoP8o+Z/ZpPcPlDW3x2vHa3Noqh0Na0E=; b=l37x66YK0ii64EZiLhYMbK0jh9j+Oj797TeOgMWjNmc8URTd0xNHicNj73Irlv3KI23WcdrEOczsgN6G4JfRbNb8b/6rBRfl7P01XlqroboMe1UHfG/JIX/FCazFY0qQDayvxFmHfbWtrkCH2MQV/esCCI8/ECEqx2CU1sogrE8= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1576174348501183.15071340948725; Thu, 12 Dec 2019 10:12:28 -0800 (PST) Received: from localhost ([::1]:35364 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ifSwt-0003t6-1O for importer@patchew.org; Thu, 12 Dec 2019 13:12:27 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:38120) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ifRX7-0007va-Em for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:41:46 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ifRX6-00050O-CT for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:41:45 -0500 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:28787 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ifRX6-0004zH-89 for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:41:44 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-206-uEWIHJbHPSKVWZgpCuPlmw-1; Thu, 12 Dec 2019 11:41:42 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B2A80107ACFE for ; Thu, 12 Dec 2019 16:41:41 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-116-226.ams2.redhat.com [10.36.116.226]) by smtp.corp.redhat.com (Postfix) with ESMTP id D6F1060BE1; Thu, 12 Dec 2019 16:41:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576168903; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=vFc4dMo8yhjVoP8o+Z/ZpPcPlDW3x2vHa3Noqh0Na0E=; b=jUkNi4bbDFZXdc2qpiS9fTkxjgAO/n3oqrYwngB1V+8prUjc+AxAa4G2fFo5Twro0GyQKr tnaaLJg1wqV4CmoIiKLe0uTbocCXJlWO0LERKW8eJnWlAkcbmaQoIQl8b9zRujXpmZUOT8 6Qn6Co7gUJ4TOa/XgsrCCO4gSRofh1I= From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com Subject: [PATCH 098/104] virtiofsd: add definition of fuse_buf_writev() Date: Thu, 12 Dec 2019 16:38:58 +0000 Message-Id: <20191212163904.159893-99-dgilbert@redhat.com> In-Reply-To: <20191212163904.159893-1-dgilbert@redhat.com> References: <20191212163904.159893-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: uEWIHJbHPSKVWZgpCuPlmw-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" From: piaojun Define fuse_buf_writev() which use pwritev and writev to improve io bandwidth. Especially, the src bufs with 0 size should be skipped as their mems are not *block_size* aligned which will cause writev failed in direct io mode. Signed-off-by: Jun Piao Suggested-by: Stefan Hajnoczi --- tools/virtiofsd/buffer.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/tools/virtiofsd/buffer.c b/tools/virtiofsd/buffer.c index f59d8d72eb..ae420c70c4 100644 --- a/tools/virtiofsd/buffer.c +++ b/tools/virtiofsd/buffer.c @@ -13,6 +13,7 @@ #include "fuse_lowlevel.h" #include #include +#include #include #include =20 @@ -32,6 +33,44 @@ size_t fuse_buf_size(const struct fuse_bufvec *bufv) return size; } =20 +__attribute__((unused)) +static ssize_t fuse_buf_writev(fuse_req_t req, + struct fuse_buf *out_buf, + struct fuse_bufvec *in_buf) +{ + ssize_t res, i, j; + size_t iovcnt =3D in_buf->count; + struct iovec *iov; + int fd =3D out_buf->fd; + + iov =3D calloc(iovcnt, sizeof(struct iovec)); + if (!iov) { + return -ENOMEM; + } + + for (i =3D 0, j =3D 0; i < iovcnt; i++) { + /* Skip the buf with 0 size */ + if (in_buf->buf[i].size) { + iov[j].iov_base =3D in_buf->buf[i].mem; + iov[j].iov_len =3D in_buf->buf[i].size; + j++; + } + } + + if (out_buf->flags & FUSE_BUF_FD_SEEK) { + res =3D pwritev(fd, iov, iovcnt, out_buf->pos); + } else { + res =3D writev(fd, iov, iovcnt); + } + + if (res =3D=3D -1) { + res =3D -errno; + } + + free(iov); + return res; +} + static size_t min_size(size_t s1, size_t s2) { return s1 < s2 ? s1 : s2; --=20 2.23.0