#!/bin/sh
#
# Copyright (c) 2012 Robert N. M. Watson
# All rights reserved.
#
# This software was developed at the University of Cambridge Computer
# Laboratory with support from a grant from Google, Inc.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$
#
# This script creates a trace of NFS RPCs, NFS attribute cache
# activity, and NFS access cache activity, along with the system call
# that instigated the activity. Notice that NFS events may happen
# outside of the context of a system call, most likely due to the VM
# system paging from NFS, in which case the system call name is
# reported as "-"

/usr/sbin/dtrace -n '
#pragma D option quiet

dtrace:::BEGIN
{
	printf("probe\targ0\texecutable\tsyscall\n");
}

syscall:::entry
{

        self->syscallname = probefunc;
}

syscall:::return
{

        self->syscallname = "";
}

nfsclient:::
/self->syscallname != 0 && self->syscallname != ""/
{

    printf("%s\t%s\t%s\t%s\n", probemod, stringof(arg0), execname, 
	    self->syscallname);
}

nfsclient:::
/self->syscallname == 0 || self->syscallname == ""/
{

    printf("%s\t%s\t%s\t%s\n", probemod, stringof(arg0), execname, 
	    self->syscallname);
}
'