Adding upstream version 4.22.0.upstream/4.22.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 221 insertions, 0 deletions

diff --git a/upstream/archlinux/man8/nfsdcld.8 b/upstream/archlinux/man8/nfsdcld.8
new file mode 100644
index 00000000..861f1c49
--- /dev/null
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+.\" ========================================================================
+.\"
+.IX Title "NFSDCLD 8"
+.TH NFSDCLD 8 "2011-12-21" "" ""
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+nfsdcld \- NFSv4 Client Tracking Daemon
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+nfsdcld [\-d] [\-F] [\-p path] [\-s stable storage dir]
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+nfsdcld is the NFSv4 client tracking daemon. It is not necessary to run
+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 daemon provides the
+userspace piece of that functionality.
+.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"
+Runs the daemon in the foreground and prints all output to stderr
+.IP "\fB\-p\fR \fIpath\fR, \fB\-\-pipefsdir\fR=\fIpath\fR" 4
+.IX Item "-p path, --pipefsdir=path"
+Location of the rpc_pipefs filesystem. The default value is
+\&\fI/var/lib/nfs/rpc_pipefs\fR.
+.IP "\fB\-s\fR \fIstorage_dir\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/nfsdcld\fR.
+.SH "CONFIGURATION FILE"
+.IX Header "CONFIGURATION FILE"
+The following values are recognized in the \fB[nfsdcld]\fR section
+of the \fI/etc/nfs.conf\fR configuration file:
+.IP "\fBstoragedir\fR" 4
+.IX Item "storagedir"
+Equivalent to \fB\-s\fR/\fB\-\-storagedir\fR.
+.IP "\fBdebug\fR" 4
+.IX Item "debug"
+Setting "debug = 1" is equivalent to \fB\-d\fR/\fB\-\-debug\fR.
+.LP
+In addition, the following value is recognized from the \fB[general]\fR section:
+.IP "\fBpipefs\-directory\fR" 4
+.IX Item "pipefs-directory"
+Equivalent to \fB\-p\fR/\fB\-\-pipefsdir\fR.
+.SH "NOTES"
+.IX Header "NOTES"
+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.
+.PP
+This changed with the original introduction of \fBnfsdcld\fR upcall in kernel version 3.4,
+which was later deprecated in favor of the \fBnfsdcltrack\fR(8) usermodehelper
+program, support for which was added in kernel version 3.8.  However, since the
+usermodehelper upcall does not work in containers, support for a new version of
+the \fBnfsdcld\fR upcall was added in kernel version 5.2.
+.PP
+This daemon requires a kernel that supports the \fBnfsdcld\fR upcall. On older kernels, if
+the legacy client name tracking code was in use, then the kernel would not create the
+pipe that \fBnfsdcld\fR uses to talk to the kernel.  On newer kernels, nfsd attempts to
+initialize client tracking in the following order:  First, the \fBnfsdcld\fR upcall.  Second,
+the \fBnfsdcltrack\fR usermodehelper upcall.  Finally, the legacy client tracking.
+.PP
+This daemon should be run as root, as the pipe that it uses to communicate
+with the kernel is only accessable by root. The daemon however does drop all
+superuser capabilities after starting. Because of this, the \fIstoragedir\fR
+should be owned by root, and be readable and writable by owner.
+.PP
+The daemon now supports different upcall versions to allow the kernel to pass additional
+data to be stored in the on-disk database.  The kernel will query the supported upcall
+version from \fBnfsdcld\fR during client tracking initialization.  A restart of \fBnfsd\fR is
+not necessary after upgrading \fBnfsdcld\fR, however \fBnfsd\fR will not use a later upcall
+version until restart.  A restart of \fBnfsd is necessary\fR after downgrading \fBnfsdcld\fR,
+to ensure that \fBnfsd\fR does not use an upcall version that \fBnfsdcld\fR does not support.
+Additionally, a downgrade of \fBnfsdcld\fR requires the schema of the on-disk database to
+be downgraded as well.  That can be accomplished using the \fBnfsdclddb\fR(8) utility.
+.SH FILES
+.TP
+.B /var/lib/nfs/nfsdcld/main.sqlite
+.SH SEE ALSO
+.BR nfsdcltrack "(8), " nfsdclddb (8)
+.SH "AUTHORS"
+.IX Header "AUTHORS"
+The nfsdcld daemon was developed by Jeff Layton <jlayton@redhat.com>
+with modifications from Scott Mayhew <smayhew@redhat.com>.