From nobody Fri Dec 19 08:13:19 2025 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=1576170972; cv=none; d=zohomail.com; s=zohoarc; b=EtY32e/xu4tQAht/SomPQg1Eph3fCd9p+26GizRLbUxz/h7wrY0+oIrjVOclc8yU8AjZd93MHr5u2IIrwSQZ5rGnyJM+fxtAgR/WuIXRb3w4tnTwDz4gp0dGvodbfGwF57lT6UiAvHYkRWIR+nBDF4kHas0VprFHOMwQ9S19w4g= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1576170972; 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=lTsbTmjXGySrUE5zs/n5qZKAmmP3lDqBaYyOa+YlryE=; b=KWv03sPjod7+1owqI4op6Fd7FzhoYuov0ChhPYpDJeaVV3lwouLji0y/ejKk/aoT/vNcMysssiaxK7R+z8LKXhy1U52wdWXISf/wtgpjpgbY5gjpcxorswF8sek/0ZZIhNe7PWurWVvVrLH2Z2evKnnULYl5r17e3G4w4NVJMGo= 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 1576170972902488.63018362385924; Thu, 12 Dec 2019 09:16:12 -0800 (PST) Received: from localhost ([::1]:34530 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ifS4Q-00041b-QF for importer@patchew.org; Thu, 12 Dec 2019 12:16:10 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:53656) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ifRW1-0006LR-KA for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:40:38 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ifRW0-0002oC-CB for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:40:37 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:35912 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 1ifRW0-0002nI-7b for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:40:36 -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-387-d4vcgBpxOKWLofUATTdNEg-1; Thu, 12 Dec 2019 11:40:33 -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 A503B64A7F for ; Thu, 12 Dec 2019 16:40:32 +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 CE04160BF3; Thu, 12 Dec 2019 16:40:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576168835; 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=lTsbTmjXGySrUE5zs/n5qZKAmmP3lDqBaYyOa+YlryE=; b=PYWE4mdqs5TzUXaiPmP2ZuLAbE2IdOvq1aCGH/d2f2yIPUXVizIYOFOe9aEMgFVd/ldybW fayaC3jB+/mrRImWEWxKm1ET+Trw3bG93R97ltj3dn6QXGW7TfxDZG/pNrOk2nL40yuEI3 bYrgYCtNPHzVH/y1/cyjeuceRdEwNNo= From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com Subject: [PATCH 054/104] virtiofsd: set maximum RLIMIT_NOFILE limit Date: Thu, 12 Dec 2019 16:38:14 +0000 Message-Id: <20191212163904.159893-55-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: d4vcgBpxOKWLofUATTdNEg-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: 207.211.31.120 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" From: Stefan Hajnoczi virtiofsd can exceed the default open file descriptor limit easily on most systems. Take advantage of the fact that it runs as root to raise the limit. Signed-off-by: Stefan Hajnoczi --- tools/virtiofsd/passthrough_ll.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough= _ll.c index ab318a6f36..139bf08f4c 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -52,6 +52,7 @@ #include #include #include +#include #include #include #include @@ -2250,6 +2251,35 @@ static void setup_sandbox(struct lo_data *lo, struct= fuse_session *se) setup_seccomp(); } =20 +/* Raise the maximum number of open file descriptors */ +static void setup_nofile_rlimit(void) +{ + const rlim_t max_fds =3D 1000000; + struct rlimit rlim; + + if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) { + fuse_log(FUSE_LOG_ERR, "getrlimit(RLIMIT_NOFILE): %m\n"); + exit(1); + } + + if (rlim.rlim_cur >=3D max_fds) { + return; /* nothing to do */ + } + + rlim.rlim_cur =3D max_fds; + rlim.rlim_max =3D max_fds; + + if (setrlimit(RLIMIT_NOFILE, &rlim) < 0) { + /* Ignore SELinux denials */ + if (errno =3D=3D EPERM) { + return; + } + + fuse_log(FUSE_LOG_ERR, "setrlimit(RLIMIT_NOFILE): %m\n"); + exit(1); + } +} + int main(int argc, char *argv[]) { struct fuse_args args =3D FUSE_ARGS_INIT(argc, argv); @@ -2371,6 +2401,8 @@ int main(int argc, char *argv[]) =20 fuse_daemonize(opts.foreground); =20 + setup_nofile_rlimit(); + /* Must be before sandbox since it wants /proc */ setup_capng(); =20 --=20 2.23.0