From patchwork Mon Jan 27 16:25:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 11352875 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C4A3A1398 for ; Mon, 27 Jan 2020 16:26:12 +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 5A073206D5 for ; Mon, 27 Jan 2020 16:26:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ak++zgi/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5A073206D5 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:47541 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iw7DH-0004to-8M for patchwork-qemu-devel@patchwork.kernel.org; Mon, 27 Jan 2020 11:26:11 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:59566) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iw7Cc-0004Sd-6L for qemu-devel@nongnu.org; Mon, 27 Jan 2020 11:25:33 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iw7Ca-0003PH-Er for qemu-devel@nongnu.org; Mon, 27 Jan 2020 11:25:29 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:22470 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 1iw7Ca-0003Ox-AH for qemu-devel@nongnu.org; Mon, 27 Jan 2020 11:25:28 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1580142327; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=7vRasnHn1TWS1kkDbzF6M4jxihQyaS0r7w9JAUdETvQ=; b=ak++zgi/taRdOKA4txxS/zeGJBEH/9fzu12s0C2y8PiwpGBOKVSa8Nh4krUqUKCnUWIlWK HpJEXdbrJdGSvk0c11r9xfeBgpMF88kQG1U0rQ365WbnYiTHPu2hW9RFqqcEFXV/NXxPxa MHmwZciQFiR7AR3NVr98GSrcH1FlSto= 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-391-oFmbMbrTOlWwUPFVX2yqxg-1; Mon, 27 Jan 2020 11:25:22 -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 9D70D109B318; Mon, 27 Jan 2020 16:25:21 +0000 (UTC) Received: from localhost (ovpn-117-180.ams2.redhat.com [10.36.117.180]) by smtp.corp.redhat.com (Postfix) with ESMTP id EF05E60C05; Mon, 27 Jan 2020 16:25:15 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PATCH] docs: add virtiofsd(1) man page Date: Mon, 27 Jan 2020 16:25:14 +0000 Message-Id: <20200127162514.56784-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: oFmbMbrTOlWwUPFVX2yqxg-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: 207.211.31.120 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: , Cc: Peter Maydell , "Dr. David Alan Gilbert" , Stefan Hajnoczi Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Document the virtiofsd(1) program and its command-line options. This man page is a rST conversion of the original texi documentation that I wrote. Signed-off-by: Stefan Hajnoczi Reviewed-by: Liam Merwick --- Based-on: 20200124162606.8787-1-peter.maydell@linaro.org ("[PATCH v2 0/8] qemu-img, qemu-trace-stap, virtfs-proxy-helper: convert to rST") --- MAINTAINERS | 1 + Makefile | 8 ++- docs/interop/conf.py | 5 +- docs/interop/index.rst | 1 + docs/interop/virtiofsd.rst | 123 +++++++++++++++++++++++++++++++++++++ 5 files changed, 136 insertions(+), 2 deletions(-) create mode 100644 docs/interop/virtiofsd.rst diff --git a/MAINTAINERS b/MAINTAINERS index 83fb32b860..1da0709129 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1603,6 +1603,7 @@ S: Supported F: tools/virtiofsd/* F: hw/virtio/vhost-user-fs* F: include/hw/virtio/vhost-user-fs.h +F: docs/interop/virtiofsd.rst virtio-input M: Gerd Hoffmann diff --git a/Makefile b/Makefile index 539f9ef079..ecd26044bc 100644 --- a/Makefile +++ b/Makefile @@ -348,6 +348,9 @@ DOCS=qemu-doc.html qemu-doc.txt qemu.1 DOCS+=$(MANUAL_BUILDDIR)/interop/qemu-img.1 DOCS+=$(MANUAL_BUILDDIR)/interop/qemu-nbd.8 DOCS+=$(MANUAL_BUILDDIR)/interop/qemu-ga.8 +ifeq ($(CONFIG_LINUX)$(CONFIG_SECCOMP)$(CONFIG_LIBCAP_NG),yyy) +DOCS+=$(MANUAL_BUILDDIR)/interop/virtiofsd.1 +endif DOCS+=$(MANUAL_BUILDDIR)/system/qemu-block-drivers.7 DOCS+=docs/interop/qemu-qmp-ref.html docs/interop/qemu-qmp-ref.txt docs/interop/qemu-qmp-ref.7 DOCS+=docs/interop/qemu-ga-ref.html docs/interop/qemu-ga-ref.txt docs/interop/qemu-ga-ref.7 @@ -861,6 +864,9 @@ ifdef CONFIG_VIRTFS $(INSTALL_DIR) "$(DESTDIR)$(mandir)/man1" $(INSTALL_DATA) $(MANUAL_BUILDDIR)/interop/virtfs-proxy-helper.1 "$(DESTDIR)$(mandir)/man1" endif +ifeq ($(CONFIG_LINUX)$(CONFIG_SECCOMP)$(CONFIG_LIBCAP_NG),yyy) + $(INSTALL_DATA) docs/interop/virtiofsd.1 "$(DESTDIR)$(mandir)/man1" +endif install-datadir: $(INSTALL_DIR) "$(DESTDIR)$(qemu_datadir)" @@ -1052,7 +1058,7 @@ $(MANUAL_BUILDDIR)/system/index.html: $(call manual-deps,system) $(call define-manpage-rule,interop,\ qemu-ga.8 qemu-img.1 qemu-nbd.8 qemu-trace-stap.1\ - virtfs-proxy-helper.1,\ + virtiofsd.1 virtfs-proxy-helper.1,\ $(SRC_PATH/qemu-img-cmds.hx)) $(call define-manpage-rule,system,qemu-block-drivers.7) diff --git a/docs/interop/conf.py b/docs/interop/conf.py index b0f322207c..b3cda17042 100644 --- a/docs/interop/conf.py +++ b/docs/interop/conf.py @@ -27,5 +27,8 @@ man_pages = [ [], 1), ('virtfs-proxy-helper', 'virtfs-proxy-helper', u'QEMU 9p virtfs proxy filesystem helper', - ['M. Mohan Kumar'], 1) + ['M. Mohan Kumar'], 1), + ('virtiofsd', 'virtiofsd', u'QEMU virtio-fs shared file system daemon', + ['Stefan Hajnoczi ', + 'Masayoshi Mizuma '], 1), ] diff --git a/docs/interop/index.rst b/docs/interop/index.rst index 3b763b1eeb..e8455b4270 100644 --- a/docs/interop/index.rst +++ b/docs/interop/index.rst @@ -24,3 +24,4 @@ Contents: vhost-user vhost-user-gpu virtfs-proxy-helper + virtiofsd diff --git a/docs/interop/virtiofsd.rst b/docs/interop/virtiofsd.rst new file mode 100644 index 0000000000..51a657ac0c --- /dev/null +++ b/docs/interop/virtiofsd.rst @@ -0,0 +1,123 @@ +QEMU virtio-fs shared file system daemon +======================================== + +Synopsis +-------- + +**virtiofsd** [*OPTIONS*] + +Description +----------- + +Share a host directory tree with a guest through a virtio-fs device. This +program is a vhost-user backend that implements the virtio-fs device. Each +virtio-fs device instance requires its own virtiofsd process. + +This program is designed to work with QEMU's ``--device vhost-user-fs-pci`` +but should work with any virtual machine monitor (VMM) that supports +vhost-user. See the Examples section below. + +This program must be run as the root user. Upon startup the program will +switch into a new file system namespace with the shared directory tree as its +root. This prevents "file system escapes" due to symlinks and other file +system objects that might lead to files outside the shared directory. The +program also sandboxes itself using seccomp(2) to prevent ptrace(2) and other +vectors that could allow an attacker to compromise the system after gaining +control of the virtiofsd process. + +Options +------- + +.. program:: virtiofsd + +.. option:: -h, --help + + Print help. + +.. option:: -V, --version + + Print version. + +.. option:: -d + + Enable debug output. + +.. option:: --syslog + + Print log messages to syslog instead of stderr. + +.. option:: -o OPTION + + * debug - + Enable debug output. + + * flock|no_flock - + Enable/disable flock. The default is ``no_flock``. + + * log_level=LEVEL - + Print only log messages matching LEVEL or more severe. LEVEL is one of + ``err``, ``warn``, ``info``, or ``debug``. The default is ``info``. + + * norace - + Disable racy fallback. The default is false. + + * posix_lock|no_posix_lock - + Enable/disable remote POSIX locks. The default is ``posix_lock``. + + * readdirplus|no_readdirplus - + Enable/disable readdirplus. The default is ``readdirplus``. + + * source=PATH - + Share host directory tree located at PATH. This option is required. + + * timeout=TIMEOUT - + I/O timeout in seconds. The default depends on cache= option. + + * vhost_user_socket=PATH - + Listen on vhost-user UNIX domain socket at PATH. + + * writeback|no_writeback - + Enable/disable writeback cache. The cache alows the FUSE client to buffer + and merge write requests. The default is ``no_writeback``. + + * xattr|no_xattr - + Enable/disable extended attributes (xattr) on files and directories. The + default is ``no_xattr``. + +.. option:: --socket-path=PATH + + Listen on vhost-user UNIX domain socket at PATH. + +.. option:: --fd=FDNUM + + Accept connections from vhost-user UNIX domain socket file descriptor FDNUM. + The file descriptor must already be listening for connections. + +.. option:: --thread-pool-size=NUM + + Restrict the number of worker threads per request queue to NUM. The default + is 64. + +.. option:: --cache=none|auto|always + + Select the desired trade-off between coherency and performance. ``none`` + forbids the FUSE client from caching to achieve best coherency at the cost of + performance. ``auto`` acts similar to NFS with a 1 second metadata cache + timeout. ``always`` sets a long cache lifetime at the expense of coherency. + +Examples +-------- + +Export ``/var/lib/fs/vm001/`` on vhost-user UNIX domain socket +``/var/run/vm001-vhost-fs.sock``: + +:: + + host# virtiofsd --socket-path=/var/run/vm001-vhost-fs.sock -o source=/var/lib/fs/vm001 + host# qemu-system-x86_64 \ + -chardev socket,id=char0,path=/var/run/vm001-vhost-fs.sock \ + -device vhost-user-fs-pci,chardev=char0,tag=myfs \ + -object memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on \ + -numa node,memdev=mem \ + ... + guest# mount -t virtio_fs myfs /mnt