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kern_acct.c revision 1.1.1.3 
      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 8.8 (Berkeley) 5/14/95
     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 acct(a1, a2, a3)
     50 	struct proc *a1;
     51 	struct acct_args /* {
     52 		syscallarg(char *) path;
     53 	} */ *a2;
     54 	int *a3;
     55 {
     56 	/*
     57 	 * Body deleted.
     58 	 */
     59 	return (ENOSYS);
     60 }
     61 
     62 acct_process(a1)
     63 	struct proc *a1;
     64 {
     65 
     66 	/*
     67 	 * Body deleted.
     68 	 */
     69 	return;
     70 }
     71 
     72 /*
     73  * Periodically check the file system to see if accounting
     74  * should be turned on or off. Beware the case where the vnode
     75  * has been vgone()'d out from underneath us, e.g. when the file
     76  * system containing the accounting file has been forcibly unmounted.
     77  */
     78 
     79 /*
     80  * Values associated with enabling and disabling accounting
     81  */
     82 int	acctsuspend = 2;	/* stop accounting when < 2% free space left */
     83 int	acctresume = 4;		/* resume when free space risen to > 4% */
     84 int	acctchkfreq = 15;	/* frequency (in seconds) to check space */
     85 
     86 /*
     87  * SHOULD REPLACE THIS WITH A DRIVER THAT CAN BE READ TO SIMPLIFY.
     88  */
     89 struct	vnode *acctp;
     90 struct	vnode *savacctp;
     91 
     92 /* ARGSUSED */
     93 void
     94 acctwatch(a)
     95 	void *a;
     96 {
     97 	struct statfs sb;
     98 
     99 	if (savacctp) {
    100 		if (savacctp->v_type == VBAD) {
    101 			(void) vn_close(savacctp, FWRITE, NOCRED, NULL);
    102 			savacctp = NULL;
    103 			return;
    104 		}
    105 		(void)VFS_STATFS(savacctp->v_mount, &sb, (struct proc *)0);
    106 		if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
    107 			acctp = savacctp;
    108 			savacctp = NULL;
    109 			log(LOG_NOTICE, "Accounting resumed\n");
    110 		}
    111 	} else {
    112 		if (acctp == NULL)
    113 			return;
    114 		if (acctp->v_type == VBAD) {
    115 			(void) vn_close(acctp, FWRITE, NOCRED, NULL);
    116 			acctp = NULL;
    117 			return;
    118 		}
    119 		(void)VFS_STATFS(acctp->v_mount, &sb, (struct proc *)0);
    120 		if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
    121 			savacctp = acctp;
    122 			acctp = NULL;
    123 			log(LOG_NOTICE, "Accounting suspended\n");
    124 		}
    125 	}
    126 	timeout(acctwatch, NULL, acctchkfreq * hz);
    127 }
    128