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 X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70BD6C43603 for ; Thu, 12 Dec 2019 17:37:13 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4221B2173E for ; Thu, 12 Dec 2019 17:37:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="e9H7Jn6X" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4221B2173E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:34798 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ifSOl-0006LM-VA for qemu-devel@archiver.kernel.org; Thu, 12 Dec 2019 12:37:11 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:34386) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ifRWp-0007Qv-3Q for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:41:28 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ifRWn-0004Ly-Qo for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:41:26 -0500 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:56626 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ifRWn-0004KG-Kz for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:41:25 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576168884; 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=b6k1teDJ1Q7lOJlVrnMFV+zsUU1IFDongSuB3S+yHow=; b=e9H7Jn6XeNPxUbKABpZeTXIXS3uUTdK7Ub/Ck2Y0TSKHaM6vjwyFJixKt9g10OCi15QXOb bQ7iBnw/n6OsAv4BKvarMdsIQcdrgYZAbxz7eQQwSn8D7fg/XEj8tb6tlW2QCEaHcdrzZI 8x6AVulgUMXKeGAcawAuElOJwTZGVqs= 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-38-VPaR8OBqP-i3HfFwWAAKcQ-1; Thu, 12 Dec 2019 11:41:18 -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 4D32C802B7C for ; Thu, 12 Dec 2019 16:41:17 +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 7433560BF3; Thu, 12 Dec 2019 16:41:16 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com Subject: [PATCH 081/104] virtiofsd: Prevent multiply running with same vhost_user_socket Date: Thu, 12 Dec 2019 16:38:41 +0000 Message-Id: <20191212163904.159893-82-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: VPaR8OBqP-i3HfFwWAAKcQ-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=US-ASCII 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: 205.139.110.120 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Masayoshi Mizuma virtiofsd can run multiply even if the vhost_user_socket is same path. ]# ./virtiofsd -o vhost_user_socket=3D/tmp/vhostqemu -o source=3D/tmp/sha= re & [1] 244965 virtio_session_mount: Waiting for vhost-user socket connection... ]# ./virtiofsd -o vhost_user_socket=3D/tmp/vhostqemu -o source=3D/tmp/sha= re & [2] 244966 virtio_session_mount: Waiting for vhost-user socket connection... ]# The user will get confused about the situation and maybe the cause of the unexpected problem. So it's better to prevent the multiple running. Create a regular file under localstatedir directory to exclude the vhost_user_socket. To create and lock the file, use qemu_write_pidfile() because the API has some sanity checks and file lock. Signed-off-by: Masayoshi Mizuma Signed-off-by: Dr. David Alan Gilbert Applied fixes from Stefan's review and moved osdep include Signed-off-by: Stefan Hajnoczi --- tools/virtiofsd/fuse_lowlevel.c | 1 + tools/virtiofsd/fuse_virtio.c | 49 ++++++++++++++++++++++++++++++++- 2 files changed, 49 insertions(+), 1 deletion(-) diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowleve= l.c index 14c9d99374..b1ff684de9 100644 --- a/tools/virtiofsd/fuse_lowlevel.c +++ b/tools/virtiofsd/fuse_lowlevel.c @@ -17,6 +17,7 @@ =20 #include #include +#include #include #include #include diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c index 1b5d27fe16..7b22ae8d4f 100644 --- a/tools/virtiofsd/fuse_virtio.c +++ b/tools/virtiofsd/fuse_virtio.c @@ -13,11 +13,12 @@ =20 #include "qemu/osdep.h" #include "qemu/iov.h" -#include "fuse_virtio.h" +#include "qapi/error.h" #include "fuse_i.h" #include "standard-headers/linux/fuse.h" #include "fuse_misc.h" #include "fuse_opt.h" +#include "fuse_virtio.h" =20 #include #include @@ -733,6 +734,42 @@ int virtio_loop(struct fuse_session *se) return 0; } =20 +static void strreplace(char *s, char old, char new) +{ + for (; *s; ++s) { + if (*s =3D=3D old) { + *s =3D new; + } + } +} + +static bool fv_socket_lock(struct fuse_session *se) +{ + g_autofree gchar *sk_name =3D NULL; + g_autofree gchar *pidfile =3D NULL; + g_autofree gchar *dir =3D NULL; + Error *local_err =3D NULL; + + dir =3D qemu_get_local_state_pathname("run/virtiofsd"); + + if (g_mkdir_with_parents(dir, S_IRWXU) < 0) { + fuse_log(FUSE_LOG_ERR, "%s: Failed to create directory %s: %s", + __func__, dir, strerror(errno)); + return false; + } + + sk_name =3D g_strdup(se->vu_socket_path); + strreplace(sk_name, '/', '.'); + pidfile =3D g_strdup_printf("%s/%s.pid", dir, sk_name); + + if (!qemu_write_pidfile(pidfile, &local_err)) { + error_report_err(local_err); + return false; + } + + return true; +} + static int fv_create_listen_socket(struct fuse_session *se) { struct sockaddr_un un; @@ -748,6 +785,16 @@ static int fv_create_listen_socket(struct fuse_session= *se) return -1; } =20 + if (!strlen(se->vu_socket_path)) { + fuse_log(FUSE_LOG_ERR, "Socket path is empty\n"); + return -1; + } + + /* Check the vu_socket_path is already used */ + if (!fv_socket_lock(se)) { + return -1; + } + /* * Create the Unix socket to communicate with qemu * based on QEMU's vhost-user-bridge --=20 2.23.0