kern_acct.c revision 2807 
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: kern_acct.c,v 1.3 1994/08/02 07:41:52 davidg Exp $
40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/proc.h>
45#include <sys/mount.h>
46#include <sys/vnode.h>
47#include <sys/file.h>
48#include <sys/syslog.h>
49#include <sys/kernel.h>
50
51struct acct_args {
52	char	*fname;
53};
54int
55acct(a1, a2, a3)
56	struct proc *a1;
57	struct acct_args *a2;
58	int *a3;
59{
60	/*
61	 * Body deleted.
62	 */
63	return (ENOSYS);
64}
65
66void
67acct_process(a1)
68	struct proc *a1;
69{
70
71	/*
72	 * Body deleted.
73	 */
74	return;
75}
76
77/*
78 * Periodically check the file system to see if accounting
79 * should be turned on or off.
80 */
81
82/*
83 * Values associated with enabling and disabling accounting
84 */
85int	acctsuspend = 2;	/* stop accounting when < 2% free space left */
86int	acctresume = 4;		/* resume when free space risen to > 4% */
87int	acctchkfreq = 15;	/* frequency (in seconds) to check space */
88
89/*
90 * SHOULD REPLACE THIS WITH A DRIVER THAT CAN BE READ TO SIMPLIFY.
91 */
92struct	vnode *acctp;
93struct	vnode *savacctp;
94
95/* ARGSUSED */
96void
97acctwatch(a)
98	void *a;
99{
100	struct statfs sb;
101
102	if (savacctp) {
103		(void)VFS_STATFS(savacctp->v_mount, &sb, (struct proc *)0);
104		if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
105			acctp = savacctp;
106			savacctp = NULL;
107			log(LOG_NOTICE, "Accounting resumed\n");
108		}
109	} else {
110		if (acctp == NULL)
111			return;
112		(void)VFS_STATFS(acctp->v_mount, &sb, (struct proc *)0);
113		if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
114			savacctp = acctp;
115			acctp = NULL;
116			log(LOG_NOTICE, "Accounting suspended\n");
117		}
118	}
119	timeout(acctwatch, NULL, acctchkfreq * hz);
120}
121