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kern_acct.c revision 1.23 
      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 
     49 struct acct_args {
     50 	char	*fname;
     51 };
     52 acct(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 
     63 acct_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  */
     81 int	acctsuspend = 2;	/* stop accounting when < 2% free space left */
     82 int	acctresume = 4;		/* resume when free space risen to > 4% */
     83 int	acctchkfreq = 15;	/* frequency (in seconds) to check space */
     84 
     85 /*
     86  * SHOULD REPLACE THIS WITH A DRIVER THAT CAN BE READ TO SIMPLIFY.
     87  */
     88 struct	vnode *acctp;
     89 struct	vnode *savacctp;
     90 
     91 /* ARGSUSED */
     92 void
     93 acctwatch(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