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[79.176.118.93]) by smtp.gmail.com with ESMTPSA id f3sm269918wrw.81.2020.11.03.06.35.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Nov 2020 06:35:40 -0800 (PST) Date: Tue, 3 Nov 2020 09:35:39 -0500 From: "Michael S. Tsirkin" To: qemu-devel@nongnu.org Subject: [PULL 38/38] vhost-user-blk-test: fix races by using fd passing Message-ID: <20201103142306.71782-39-mst@redhat.com> References: <20201103142306.71782-1-mst@redhat.com> MIME-Version: 1.0 In-Reply-To: <20201103142306.71782-1-mst@redhat.com> X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Received-SPF: pass client-ip=216.205.24.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/03 00:03:41 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: , Cc: Laurent Vivier , Peter Maydell , Thomas Huth , Stefan Hajnoczi , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Stefan Hajnoczi Pass the QMP and vhost-user-blk server sockets as file descriptors. That way the sockets are already open and in a listen state when the QEMU process is launched. This solves the race with qemu-storage-daemon startup where the UNIX domain sockets may not be ready yet when QEMU attempts to connect. It also saves us sleeping for 1 second if the qemu-storage-daemon QMP socket is not ready yet. Signed-off-by: Stefan Hajnoczi Message-Id: <20201027173528.213464-13-stefanha@redhat.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- tests/qtest/vhost-user-blk-test.c | 42 +++++++++++++++++++------------ 1 file changed, 26 insertions(+), 16 deletions(-) diff --git a/tests/qtest/vhost-user-blk-test.c b/tests/qtest/vhost-user-blk-test.c index 0d056cc189..9589f90b14 100644 --- a/tests/qtest/vhost-user-blk-test.c +++ b/tests/qtest/vhost-user-blk-test.c @@ -683,8 +683,22 @@ static char *drive_create(void) return t_path; } -static char sock_path_tempate[] = "/tmp/qtest.vhost_user_blk.XXXXXX"; -static char qmp_sock_path_tempate[] = "/tmp/qtest.vhost_user_blk.qmp.XXXXXX"; +static char *create_listen_socket(int *fd) +{ + int tmp_fd; + char *path; + + /* No race because our pid makes the path unique */ + path = g_strdup_printf("/tmp/qtest-%d-sock.XXXXXX", getpid()); + tmp_fd = mkstemp(path); + g_assert_cmpint(tmp_fd, >=, 0); + close(tmp_fd); + unlink(path); + + *fd = qtest_socket_server(path); + g_test_queue_destroy(destroy_file, path); + return path; +} static void quit_storage_daemon(void *qmp_test_state) { @@ -709,37 +723,33 @@ static void start_vhost_user_blk(GString *cmd_line, int vus_instances, int num_queues) { const char *vhost_user_blk_bin = qtest_qemu_storage_daemon_binary(); - int fd, qmp_fd, i; + int qmp_fd, i; QTestState *qmp_test_state; gchar *img_path; - char *sock_path = NULL; - char *qmp_sock_path = g_strdup(qmp_sock_path_tempate); + char *qmp_sock_path; GString *storage_daemon_command = g_string_new(NULL); - qmp_fd = mkstemp(qmp_sock_path); - g_assert_cmpint(qmp_fd, >=, 0); - g_test_queue_destroy(destroy_file, qmp_sock_path); + qmp_sock_path = create_listen_socket(&qmp_fd); g_string_append_printf(storage_daemon_command, "exec %s " - "--chardev socket,id=qmp,path=%s,server,nowait --monitor chardev=qmp ", - vhost_user_blk_bin, qmp_sock_path); + "--chardev socket,id=qmp,fd=%d,server,nowait --monitor chardev=qmp ", + vhost_user_blk_bin, qmp_fd); g_string_append_printf(cmd_line, " -object memory-backend-memfd,id=mem,size=256M,share=on -M memory-backend=mem "); for (i = 0; i < vus_instances; i++) { - sock_path = g_strdup(sock_path_tempate); - fd = mkstemp(sock_path); - g_assert_cmpint(fd, >=, 0); - g_test_queue_destroy(drive_file, sock_path); + int fd; + char *sock_path = create_listen_socket(&fd); + /* create image file */ img_path = drive_create(); g_string_append_printf(storage_daemon_command, "--blockdev driver=file,node-name=disk%d,filename=%s " - "--export type=vhost-user-blk,id=disk%d,addr.type=unix,addr.path=%s," + "--export type=vhost-user-blk,id=disk%d,addr.type=fd,addr.str=%d," "node-name=disk%i,writable=on,num-queues=%d ", - i, img_path, i, sock_path, i, num_queues); + i, img_path, i, fd, i, num_queues); g_string_append_printf(cmd_line, "-chardev socket,id=char%d,path=%s ", i + 1, sock_path);