kern_acct.c revision 1817 
1/*-
2 * Copyright (c) 1982, 1986, 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 *	from: @(#)kern_acct.c	8.1 (Berkeley) 6/14/93
39 * $Id$
40 */
41
42#include <sys/param.h>
43#include <sys/proc.h>
44#include <sys/mount.h>
45#include <sys/vnode.h>
46#include <sys/file.h>
47#include <sys/syslog.h>
48#include <sys/kernel.h>
49
50struct acct_args {
51	char	*fname;
52};
53int
54acct(a1, a2, a3)
55	struct proc *a1;
56	struct acct_args *a2;
57	int *a3;
58{
59	/*
60	 * Body deleted.
61	 */
62	return (ENOSYS);
63}
64
65void
66acct_process(a1)
67	struct proc *a1;
68{
69
70	/*
71	 * Body deleted.
72	 */
73	return;
74}
75
76/*
77 * Periodically check the file system to see if accounting
78 * should be turned on or off.
79 */
80
81/*
82 * Values associated with enabling and disabling accounting
83 */
84int	acctsuspend = 2;	/* stop accounting when < 2% free space left */
85int	acctresume = 4;		/* resume when free space risen to > 4% */
86int	acctchkfreq = 15;	/* frequency (in seconds) to check space */
87
88/*
89 * SHOULD REPLACE THIS WITH A DRIVER THAT CAN BE READ TO SIMPLIFY.
90 */
91struct	vnode *acctp;
92struct	vnode *savacctp;
93
94/* ARGSUSED */
95void
96acctwatch(a)
97	void *a;
98{
99	struct statfs sb;
100
101	if (savacctp) {
102		(void)VFS_STATFS(savacctp->v_mount, &sb, (struct proc *)0);
103		if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
104			acctp = savacctp;
105			savacctp = NULL;
106			log(LOG_NOTICE, "Accounting resumed\n");
107		}
108	} else {
109		if (acctp == NULL)
110			return;
111		(void)VFS_STATFS(acctp->v_mount, &sb, (struct proc *)0);
112		if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
113			savacctp = acctp;
114			acctp = NULL;
115			log(LOG_NOTICE, "Accounting suspended\n");
116		}
117	}
118	timeout(acctwatch, NULL, acctchkfreq * hz);
119}
120