kern_acct.c revision 1541 
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 */
40
41#include <sys/param.h>
42#include <sys/proc.h>
43#include <sys/mount.h>
44#include <sys/vnode.h>
45#include <sys/file.h>
46#include <sys/syslog.h>
47#include <sys/kernel.h>
48
49struct acct_args {
50	char	*fname;
51};
52acct(a1, a2, a3)
53	struct proc *a1;
54	struct acct_args *a2;
55	int *a3;
56{
57	/*
58	 * Body deleted.
59	 */
60	return (ENOSYS);
61}
62
63acct_process(a1)
64	struct proc *a1;
65{
66
67	/*
68	 * Body deleted.
69	 */
70	return;
71}
72
73/*
74 * Periodically check the file system to see if accounting
75 * should be turned on or off.
76 */
77
78/*
79 * Values associated with enabling and disabling accounting
80 */
81int	acctsuspend = 2;	/* stop accounting when < 2% free space left */
82int	acctresume = 4;		/* resume when free space risen to > 4% */
83int	acctchkfreq = 15;	/* frequency (in seconds) to check space */
84
85/*
86 * SHOULD REPLACE THIS WITH A DRIVER THAT CAN BE READ TO SIMPLIFY.
87 */
88struct	vnode *acctp;
89struct	vnode *savacctp;
90
91/* ARGSUSED */
92void
93acctwatch(a)
94	void *a;
95{
96	struct statfs sb;
97
98	if (savacctp) {
99		(void)VFS_STATFS(savacctp->v_mount, &sb, (struct proc *)0);
100		if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
101			acctp = savacctp;
102			savacctp = NULL;
103			log(LOG_NOTICE, "Accounting resumed\n");
104		}
105	} else {
106		if (acctp == NULL)
107			return;
108		(void)VFS_STATFS(acctp->v_mount, &sb, (struct proc *)0);
109		if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
110			savacctp = acctp;
111			acctp = NULL;
112			log(LOG_NOTICE, "Accounting suspended\n");
113		}
114	}
115	timeout(acctwatch, NULL, acctchkfreq * hz);
116}
117