From patchwork Thu Jan 23 11:57:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Dr. David Alan Gilbert" X-Patchwork-Id: 1228022 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=g6Lyg0bg; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 483PDC5RKTz9sNF for ; Fri, 24 Jan 2020 01:04:59 +1100 (AEDT) Received: from localhost ([::1]:57618 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iud6O-0007JX-QK for incoming@patchwork.ozlabs.org; Thu, 23 Jan 2020 09:04:56 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:41095) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iub9z-0003fQ-S6 for qemu-devel@nongnu.org; Thu, 23 Jan 2020 07:00:33 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iub9y-0005uk-H7 for qemu-devel@nongnu.org; Thu, 23 Jan 2020 07:00:31 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:48963 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 1iub9y-0005uZ-Da for qemu-devel@nongnu.org; Thu, 23 Jan 2020 07:00:30 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579780830; 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=A1ZIGOFSVxZZlfcS1KkwYJ8eZPN9KsNnSOn1WzU0TM8=; b=g6Lyg0bgBduFFs8bTGC9D5lyI4mWqfUmFyro0rev/vDXbBoOlnmAp8ZGMrrKdx48fcKIig o3jNfbS4zDNDQZ1ICXIXZAnybhlNr8xwJjsnITMwnCf3HE4geFgGDJbyE8BO9ciA2TcPSH g+GdpJ6B3etxibSHtABiC8HXuJLqqPE= 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-399-Ago3axJ3Oy2ddaqdKAiTJQ-1; Thu, 23 Jan 2020 07:00:24 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B79ACDB63 for ; Thu, 23 Jan 2020 12:00:23 +0000 (UTC) Received: from dgilbert-t580.localhost (unknown [10.36.118.0]) by smtp.corp.redhat.com (Postfix) with ESMTP id 64B791CB; Thu, 23 Jan 2020 12:00:21 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com Subject: [PULL 066/111] virtiofsd: Kill threads when queues are stopped Date: Thu, 23 Jan 2020 11:57:56 +0000 Message-Id: <20200123115841.138849-67-dgilbert@redhat.com> In-Reply-To: <20200123115841.138849-1-dgilbert@redhat.com> References: <20200123115841.138849-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: Ago3axJ3Oy2ddaqdKAiTJQ-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 207.211.31.81 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: "Dr. David Alan Gilbert" Kill the threads we've started when the queues get stopped. Signed-off-by: Dr. David Alan Gilbert With improvements by: Signed-off-by: Eryu Guan Reviewed-by: Daniel P. Berrangé Signed-off-by: Dr. David Alan Gilbert --- tools/virtiofsd/fuse_virtio.c | 51 ++++++++++++++++++++++++++++++----- 1 file changed, 44 insertions(+), 7 deletions(-) diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c index 872968f2c8..7a8774a3ee 100644 --- a/tools/virtiofsd/fuse_virtio.c +++ b/tools/virtiofsd/fuse_virtio.c @@ -41,6 +41,7 @@ struct fv_QueueInfo { /* Our queue index, corresponds to array position */ int qidx; int kick_fd; + int kill_fd; /* For killing the thread */ /* The element for the command currently being processed */ VuVirtqElement *qe; @@ -412,14 +413,17 @@ static void *fv_queue_thread(void *opaque) fuse_log(FUSE_LOG_INFO, "%s: Start for queue %d kick_fd %d\n", __func__, qi->qidx, qi->kick_fd); while (1) { - struct pollfd pf[1]; + struct pollfd pf[2]; pf[0].fd = qi->kick_fd; pf[0].events = POLLIN; pf[0].revents = 0; + pf[1].fd = qi->kill_fd; + pf[1].events = POLLIN; + pf[1].revents = 0; fuse_log(FUSE_LOG_DEBUG, "%s: Waiting for Queue %d event\n", __func__, qi->qidx); - int poll_res = ppoll(pf, 1, NULL, NULL); + int poll_res = ppoll(pf, 2, NULL, NULL); if (poll_res == -1) { if (errno == EINTR) { @@ -430,12 +434,23 @@ static void *fv_queue_thread(void *opaque) fuse_log(FUSE_LOG_ERR, "fv_queue_thread ppoll: %m\n"); break; } - assert(poll_res == 1); + assert(poll_res >= 1); if (pf[0].revents & (POLLERR | POLLHUP | POLLNVAL)) { fuse_log(FUSE_LOG_ERR, "%s: Unexpected poll revents %x Queue %d\n", __func__, pf[0].revents, qi->qidx); break; } + if (pf[1].revents & (POLLERR | POLLHUP | POLLNVAL)) { + fuse_log(FUSE_LOG_ERR, + "%s: Unexpected poll revents %x Queue %d killfd\n", + __func__, pf[1].revents, qi->qidx); + break; + } + if (pf[1].revents) { + fuse_log(FUSE_LOG_INFO, "%s: kill event on queue %d - quitting\n", + __func__, qi->qidx); + break; + } assert(pf[0].revents & POLLIN); fuse_log(FUSE_LOG_DEBUG, "%s: Got queue event on Queue %d\n", __func__, qi->qidx); @@ -589,6 +604,28 @@ out: return NULL; } +static void fv_queue_cleanup_thread(struct fv_VuDev *vud, int qidx) +{ + int ret; + struct fv_QueueInfo *ourqi; + + assert(qidx < vud->nqueues); + ourqi = vud->qi[qidx]; + + /* Kill the thread */ + if (eventfd_write(ourqi->kill_fd, 1)) { + fuse_log(FUSE_LOG_ERR, "Eventfd_write for queue %d: %s\n", + qidx, strerror(errno)); + } + ret = pthread_join(ourqi->thread, NULL); + if (ret) { + fuse_log(FUSE_LOG_ERR, "%s: Failed to join thread idx %d err %d\n", + __func__, qidx, ret); + } + close(ourqi->kill_fd); + ourqi->kick_fd = -1; +} + /* Callback from libvhost-user on start or stop of a queue */ static void fv_queue_set_started(VuDev *dev, int qidx, bool started) { @@ -633,16 +670,16 @@ static void fv_queue_set_started(VuDev *dev, int qidx, bool started) } ourqi = vud->qi[qidx]; ourqi->kick_fd = dev->vq[qidx].kick_fd; + + ourqi->kill_fd = eventfd(0, EFD_CLOEXEC | EFD_SEMAPHORE); + assert(ourqi->kill_fd != -1); if (pthread_create(&ourqi->thread, NULL, fv_queue_thread, ourqi)) { fuse_log(FUSE_LOG_ERR, "%s: Failed to create thread for queue %d\n", __func__, qidx); assert(0); } } else { - /* TODO: Kill the thread */ - assert(qidx < vud->nqueues); - ourqi = vud->qi[qidx]; - ourqi->kick_fd = -1; + fv_queue_cleanup_thread(vud, qidx); } }