From patchwork Wed Oct 24 15:25:56 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 1639151 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 4DDF6DF2AB for ; Wed, 24 Oct 2012 15:26:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934911Ab2JXP0R (ORCPT ); Wed, 24 Oct 2012 11:26:17 -0400 Received: from mail-vc0-f174.google.com ([209.85.220.174]:40356 "EHLO mail-vc0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934914Ab2JXP0Q (ORCPT ); Wed, 24 Oct 2012 11:26:16 -0400 Received: by mail-vc0-f174.google.com with SMTP id fk26so667015vcb.19 for ; Wed, 24 Oct 2012 08:26:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:x-mailer:in-reply-to :references:x-gm-message-state; bh=2mmoYORmhwLPHmu9dFrhimN1tvvKPjCFoDuDaDeJpbc=; b=PjUa37aKBCLCroqhHBAkduD1L5kkPtoI/uN6CMiYhd9A7jOvzKaGeT0WZ61L3r5+vQ s8oR7tqf756l1/vhzzc9mgW3Pge/Zm38rAXvjNXvNuT6J/ok6icc0eqrhV9OltEW/LV8 4G7Zci4nzbY4MpF5ITPlfKMhpftjpjxrtT1sGA5D8nhrw3UV2EBZ69X6BM8vgM/+fE9U Ei6Q/iAZsrfE241cVrep3rOaOk3Z28veocufQ46nXPSErKMZJ5afZcXuaUCePk96B4H2 a+YjTYKHNxKKhsUYOo2VSHOt/SanMQMwI5ac1oj55I1RcopDaMkoJwD5wgrs98Y4Y73x qswg== Received: by 10.220.153.15 with SMTP id i15mr26346072vcw.6.1351092374887; Wed, 24 Oct 2012 08:26:14 -0700 (PDT) Received: from salusa.poochiereds.net (cpe-107-015-110-129.nc.res.rr.com. [107.15.110.129]) by mx.google.com with ESMTPS id y15sm16388744vdt.9.2012.10.24.08.26.13 (version=SSLv3 cipher=OTHER); Wed, 24 Oct 2012 08:26:14 -0700 (PDT) From: Jeff Layton To: steved@redhat.com Cc: linux-nfs@vger.kernel.org Subject: [PATCH v2 07/10] nfsdcltrack: add a manpage for nfsdcltrack Date: Wed, 24 Oct 2012 11:25:56 -0400 Message-Id: <1351092359-25842-8-git-send-email-jlayton@redhat.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1351092359-25842-1-git-send-email-jlayton@redhat.com> References: <1351092359-25842-1-git-send-email-jlayton@redhat.com> X-Gm-Message-State: ALoCoQmX1XQtK/b9+CNIzl5L8n2AmEQn2WTs4Fvu4G5nixB0hWbV6aINGueKd5/MqaP1CN752St+ Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Signed-off-by: Jeff Layton --- utils/nfsdcltrack/Makefile.am | 2 +- utils/nfsdcltrack/nfsdcltrack.man | 211 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 212 insertions(+), 1 deletion(-) create mode 100644 utils/nfsdcltrack/nfsdcltrack.man diff --git a/utils/nfsdcltrack/Makefile.am b/utils/nfsdcltrack/Makefile.am index afae455..1746a25 100644 --- a/utils/nfsdcltrack/Makefile.am +++ b/utils/nfsdcltrack/Makefile.am @@ -1,6 +1,6 @@ ## Process this file with automake to produce Makefile.in -man8_MANS = nfsdcld.man +man8_MANS = nfsdcld.man nfsdcltrack.man EXTRA_DIST = $(man8_MANS) AM_CFLAGS += -D_LARGEFILE64_SOURCE diff --git a/utils/nfsdcltrack/nfsdcltrack.man b/utils/nfsdcltrack/nfsdcltrack.man new file mode 100644 index 0000000..47007df --- /dev/null +++ b/utils/nfsdcltrack/nfsdcltrack.man @@ -0,0 +1,211 @@ +.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.16) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +nfsdcltrack \- NFSv4 Client Tracking Callout Program +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +nfsdcltrack [\-d] [\-f] [\-s stable storage dir] +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +nfsdcltack is the NFSv4 client tracking callout program. It is not necessary +to install this daemon on machines that are not acting as NFSv4 servers. +.PP +When a network partition is combined with a server reboot, there are +edge conditions that can cause the server to grant lock reclaims when +other clients have taken conflicting locks in the interim. A more detailed +explanation of this issue is described in \s-1RFC\s0 3530, section 8.6.3. +.PP +In order to prevent these problems, the server must track a small amount +of per-client information on stable storage. This program provides the +userspace piece of that functionality. When the kernel needs to manipulate +the database that stores this info, it will execute this program to handle +it. +.SH "OPTIONS" +.IX Header "OPTIONS" +.IP "\fB\-d\fR, \fB\-\-debug\fR" 4 +.IX Item "-d, --debug" +Enable debug level logging. +.IP "\fB\-f\fR, \fB\-\-foreground\fR" 4 +.IX Item "-f, --foreground" +Log to stderr instead of syslog. +.IP "\fB\-s\fR \fIstoragedir\fR, \fB\-\-storagedir\fR=\fIstorage_dir\fR" 4 +.IX Item "-s storagedir, --storagedir=storage_dir" +Directory where stable storage information should be kept. The default +value is \fI/var/lib/nfs/nfsdcltrack\fR. +.SH "COMMANDS" +.IX Header "COMMANDS" +nfsdcltrack requires a command for each invocation. Supported commands +are: +.IP "\fBinit\fR" 4 +.IX Item "init" +Initialize the database. This command requires no argument. +.IP "\fBcreate\fR" 4 +.IX Item "create" +Create a new client record (or update the timestamp on an existing one). This command requires a hex-encoded nfs_client_id4 as an argument. +.IP "\fBremove\fR" 4 +.IX Item "remove" +Remove a client record from the database. This command requires a hex-encoded nfs_client_id4 as an argument. +.IP "\fBcheck\fR" 4 +.IX Item "check" +Check to see if a nfs_client_id4 is allowed to reclaim. This command requires a hex-encoded nfs_client_id4 as an argument. +.IP "\fBgracedone\fR" 4 +.IX Item "gracedone" +Remove any unreclaimed client records from the database. This command requires a epoch boot time as an argument. +.SH "LEGACY TRANSITION MECHANISM" +.IX Header "LEGACY TRANSITION MECHANISM" +The Linux kernel NFSv4 server has historically tracked this information +on stable storage by manipulating information on the filesystem +directly, in the directory to which \fI/proc/fs/nfsd/nfsv4recoverydir\fR +points. If the kernel passes the correct information, then nfsdcltrack +can use it to allow a seamless transition from the old client tracking +scheme to the new one. +.PP +On a \fBcheck\fR operation, if there is no record of the client in the +database, nfsdcltrack will look to see if the \fB\s-1NFSDCLTRACK_LEGACY_RECDIR\s0\fR +environment variable is set. If it is, then it will fetch that value and +see if a directory exists by that name. If it does, then the check +operation will succeed and the directory will be removed. +.PP +On a \fBgracedone\fR operation, nfsdcltrack will look to see if the +\&\fB\s-1NFSDCLTRACK_LEGACY_TOPDIR\s0\fR environment variable is set. If it is, then +it will attempt to clean out that directory prior to exiting. +.PP +Note that this transition is one-way. If the machine subsequently reboots +back into an older kernel that does not support the nfsdcltrack upcall +then the clients will not be able to recover their state. +.SH "NOTES" +.IX Header "NOTES" +This program requires a kernel that supports the nfsdcltrack usermodehelper +upcall. This support was first added to mainline kernels in 3.8. +.SH "AUTHORS" +.IX Header "AUTHORS" +nfsdcltrack was developed by Jeff Layton .