1/*-
2 * Copyright (c) 1994 Christopher G. Demetriou
3 * Copyright (c) 1982, 1986, 1989, 1993
4 * The Regents of the University of California. All rights reserved.
5 * (c) UNIX System Laboratories, Inc.
6 * All or some portions of this file are derived from material licensed
7 * to the University of California by American Telephone and Telegraph
8 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
9 * the permission of UNIX System Laboratories, Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * @(#)kern_acct.c 8.1 (Berkeley) 6/14/93
| 1/*-
2 * Copyright (c) 1994 Christopher G. Demetriou
3 * Copyright (c) 1982, 1986, 1989, 1993
4 * The Regents of the University of California. All rights reserved.
5 * (c) UNIX System Laboratories, Inc.
6 * All or some portions of this file are derived from material licensed
7 * to the University of California by American Telephone and Telegraph
8 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
9 * the permission of UNIX System Laboratories, Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * @(#)kern_acct.c 8.1 (Berkeley) 6/14/93
|
40 * $FreeBSD: head/sys/kern/kern_acct.c 104538 2002-10-05 20:05:23Z rwatson $
| 40 * $FreeBSD: head/sys/kern/kern_acct.c 106412 2002-11-04 15:13:36Z rwatson $
|
41 */
42
| 41 */
42
|
| 43#include "opt_mac.h"
44
|
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/lock.h>
46#include <sys/mutex.h>
47#include <sys/sysproto.h>
48#include <sys/proc.h>
| 45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/lock.h>
48#include <sys/mutex.h>
49#include <sys/sysproto.h>
50#include <sys/proc.h>
|
| 51#include <sys/mac.h>
|
49#include <sys/mount.h>
50#include <sys/vnode.h>
51#include <sys/fcntl.h>
52#include <sys/syslog.h>
53#include <sys/kernel.h>
54#include <sys/sysent.h>
55#include <sys/sysctl.h>
56#include <sys/namei.h>
57#include <sys/acct.h>
58#include <sys/resourcevar.h>
59#include <sys/tty.h>
60
61/*
62 * The routines implemented in this file are described in:
63 * Leffler, et al.: The Design and Implementation of the 4.3BSD
64 * UNIX Operating System (Addison Welley, 1989)
65 * on pages 62-63.
66 *
67 * Arguably, to simplify accounting operations, this mechanism should
68 * be replaced by one in which an accounting log file (similar to /dev/klog)
69 * is read by a user process, etc. However, that has its own problems.
70 */
71
72/*
73 * Internal accounting functions.
74 * The former's operation is described in Leffler, et al., and the latter
75 * was provided by UCB with the 4.4BSD-Lite release
76 */
77static comp_t encode_comp_t(u_long, u_long);
78static void acctwatch(void *);
79
80/*
81 * Accounting callout used for periodic scheduling of acctwatch.
82 */
83static struct callout acctwatch_callout;
84
85/*
86 * Accounting vnode pointer, saved vnode pointer, and flags for each.
87 */
88static struct vnode *acctp;
89static struct ucred *acctcred;
90static int acctflags;
91static struct vnode *savacctp;
92static struct ucred *savacctcred;
93static int savacctflags;
94
95static struct mtx acct_mtx;
96MTX_SYSINIT(acct, &acct_mtx, "accounting", MTX_DEF);
97
98/*
99 * Values associated with enabling and disabling accounting
100 */
101static int acctsuspend = 2; /* stop accounting when < 2% free space left */
102SYSCTL_INT(_kern, OID_AUTO, acct_suspend, CTLFLAG_RW,
103 &acctsuspend, 0, "percentage of free disk space below which accounting stops");
104
105static int acctresume = 4; /* resume when free space risen to > 4% */
106SYSCTL_INT(_kern, OID_AUTO, acct_resume, CTLFLAG_RW,
107 &acctresume, 0, "percentage of free disk space above which accounting resumes");
108
109static int acctchkfreq = 15; /* frequency (in seconds) to check space */
110SYSCTL_INT(_kern, OID_AUTO, acct_chkfreq, CTLFLAG_RW,
111 &acctchkfreq, 0, "frequency for checking the free space");
112
113/*
114 * Accounting system call. Written based on the specification and
115 * previous implementation done by Mark Tinguely.
116 *
117 * MPSAFE
118 */
119int
120acct(td, uap)
121 struct thread *td;
122 struct acct_args /* {
123 syscallarg(char *) path;
124 } */ *uap;
125{
126 struct nameidata nd;
127 int error, flags;
128
129 /* Make sure that the caller is root. */
130 error = suser(td);
131 if (error)
132 return (error);
133
134 mtx_lock(&Giant);
135 /*
136 * If accounting is to be started to a file, open that file for
137 * appending and make sure it's a 'normal'.
138 */
139 if (SCARG(uap, path) != NULL) {
140 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path),
141 td);
142 flags = FWRITE | O_APPEND;
143 error = vn_open(&nd, &flags, 0);
144 if (error)
145 goto done2;
146 NDFREE(&nd, NDF_ONLY_PNBUF);
| 52#include <sys/mount.h>
53#include <sys/vnode.h>
54#include <sys/fcntl.h>
55#include <sys/syslog.h>
56#include <sys/kernel.h>
57#include <sys/sysent.h>
58#include <sys/sysctl.h>
59#include <sys/namei.h>
60#include <sys/acct.h>
61#include <sys/resourcevar.h>
62#include <sys/tty.h>
63
64/*
65 * The routines implemented in this file are described in:
66 * Leffler, et al.: The Design and Implementation of the 4.3BSD
67 * UNIX Operating System (Addison Welley, 1989)
68 * on pages 62-63.
69 *
70 * Arguably, to simplify accounting operations, this mechanism should
71 * be replaced by one in which an accounting log file (similar to /dev/klog)
72 * is read by a user process, etc. However, that has its own problems.
73 */
74
75/*
76 * Internal accounting functions.
77 * The former's operation is described in Leffler, et al., and the latter
78 * was provided by UCB with the 4.4BSD-Lite release
79 */
80static comp_t encode_comp_t(u_long, u_long);
81static void acctwatch(void *);
82
83/*
84 * Accounting callout used for periodic scheduling of acctwatch.
85 */
86static struct callout acctwatch_callout;
87
88/*
89 * Accounting vnode pointer, saved vnode pointer, and flags for each.
90 */
91static struct vnode *acctp;
92static struct ucred *acctcred;
93static int acctflags;
94static struct vnode *savacctp;
95static struct ucred *savacctcred;
96static int savacctflags;
97
98static struct mtx acct_mtx;
99MTX_SYSINIT(acct, &acct_mtx, "accounting", MTX_DEF);
100
101/*
102 * Values associated with enabling and disabling accounting
103 */
104static int acctsuspend = 2; /* stop accounting when < 2% free space left */
105SYSCTL_INT(_kern, OID_AUTO, acct_suspend, CTLFLAG_RW,
106 &acctsuspend, 0, "percentage of free disk space below which accounting stops");
107
108static int acctresume = 4; /* resume when free space risen to > 4% */
109SYSCTL_INT(_kern, OID_AUTO, acct_resume, CTLFLAG_RW,
110 &acctresume, 0, "percentage of free disk space above which accounting resumes");
111
112static int acctchkfreq = 15; /* frequency (in seconds) to check space */
113SYSCTL_INT(_kern, OID_AUTO, acct_chkfreq, CTLFLAG_RW,
114 &acctchkfreq, 0, "frequency for checking the free space");
115
116/*
117 * Accounting system call. Written based on the specification and
118 * previous implementation done by Mark Tinguely.
119 *
120 * MPSAFE
121 */
122int
123acct(td, uap)
124 struct thread *td;
125 struct acct_args /* {
126 syscallarg(char *) path;
127 } */ *uap;
128{
129 struct nameidata nd;
130 int error, flags;
131
132 /* Make sure that the caller is root. */
133 error = suser(td);
134 if (error)
135 return (error);
136
137 mtx_lock(&Giant);
138 /*
139 * If accounting is to be started to a file, open that file for
140 * appending and make sure it's a 'normal'.
141 */
142 if (SCARG(uap, path) != NULL) {
143 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path),
144 td);
145 flags = FWRITE | O_APPEND;
146 error = vn_open(&nd, &flags, 0);
147 if (error)
148 goto done2;
149 NDFREE(&nd, NDF_ONLY_PNBUF);
|
| 150#ifdef MAC
151 error = mac_check_system_acct(td->td_ucred, nd.ni_vp);
152 if (error) {
153 vn_close(nd.ni_vp, flags, td->td_ucred, td);
154 goto done2;
155 }
156#endif
|
147 VOP_UNLOCK(nd.ni_vp, 0, td);
148 if (nd.ni_vp->v_type != VREG) {
149 vn_close(nd.ni_vp, flags, td->td_ucred, td);
150 error = EACCES;
151 goto done2;
152 }
| 157 VOP_UNLOCK(nd.ni_vp, 0, td);
158 if (nd.ni_vp->v_type != VREG) {
159 vn_close(nd.ni_vp, flags, td->td_ucred, td);
160 error = EACCES;
161 goto done2;
162 }
|
| 163#ifdef MAC
164 } else {
165 error = mac_check_system_acct(td->td_ucred, NULL);
166 if (error)
167 goto done2;
168#endif
|
153 }
154
155 /*
156 * If accounting was previously enabled, kill the old space-watcher,
157 * close the file, and (if no new file was specified, leave).
158 */
159
160 /*
161 * XXX arr: Should not hold lock over vnode operation.
162 */
163
164 mtx_lock(&acct_mtx);
165 if (acctp != NULLVP || savacctp != NULLVP) {
166 callout_stop(&acctwatch_callout);
167 error = vn_close((acctp != NULLVP ? acctp : savacctp),
168 (acctp != NULLVP ? acctflags : savacctflags),
169 (acctcred != NOCRED ? acctcred : savacctcred), td);
170 acctp = savacctp = NULLVP;
171 crfree(acctcred != NOCRED ? acctcred : savacctcred);
172 acctcred = savacctcred = NOCRED;
173 }
174 if (SCARG(uap, path) == NULL) {
175 mtx_unlock(&acct_mtx);
176 goto done2;
177 }
178
179 /*
180 * Save the new accounting file vnode, and schedule the new
181 * free space watcher.
182 */
183 acctp = nd.ni_vp;
184 acctcred = crhold(td->td_ucred);
185 acctflags = flags;
186 callout_init(&acctwatch_callout, 0);
187 mtx_unlock(&acct_mtx);
188 acctwatch(NULL);
189done2:
190 mtx_unlock(&Giant);
191 return (error);
192}
193
194/*
195 * Write out process accounting information, on process exit.
196 * Data to be written out is specified in Leffler, et al.
197 * and are enumerated below. (They're also noted in the system
198 * "acct.h" header file.)
199 */
200
201int
202acct_process(td)
203 struct thread *td;
204{
205 struct proc *p = td->td_proc;
206 struct acct acct;
207 struct rusage *r;
208 struct timeval ut, st, tmp;
209 int t, ret;
210 struct vnode *vp;
211 struct ucred *uc;
212
213 mtx_lock(&acct_mtx);
214
215 /* If accounting isn't enabled, don't bother */
216 vp = acctp;
217 if (vp == NULLVP) {
218 mtx_unlock(&acct_mtx);
219 return (0);
220 }
221
222 /*
223 * Get process accounting information.
224 */
225
226 /* (1) The name of the command that ran */
227 bcopy(p->p_comm, acct.ac_comm, sizeof acct.ac_comm);
228
229 /* (2) The amount of user and system time that was used */
230 mtx_lock_spin(&sched_lock);
231 calcru(p, &ut, &st, NULL);
232 mtx_unlock_spin(&sched_lock);
233 acct.ac_utime = encode_comp_t(ut.tv_sec, ut.tv_usec);
234 acct.ac_stime = encode_comp_t(st.tv_sec, st.tv_usec);
235
236 /* (3) The elapsed time the commmand ran (and its starting time) */
237 acct.ac_btime = p->p_stats->p_start.tv_sec;
238 microtime(&tmp);
239 timevalsub(&tmp, &p->p_stats->p_start);
240 acct.ac_etime = encode_comp_t(tmp.tv_sec, tmp.tv_usec);
241
242 /* (4) The average amount of memory used */
243 r = &p->p_stats->p_ru;
244 tmp = ut;
245 timevaladd(&tmp, &st);
246 t = tmp.tv_sec * hz + tmp.tv_usec / tick;
247 if (t)
248 acct.ac_mem = (r->ru_ixrss + r->ru_idrss + r->ru_isrss) / t;
249 else
250 acct.ac_mem = 0;
251
252 /* (5) The number of disk I/O operations done */
253 acct.ac_io = encode_comp_t(r->ru_inblock + r->ru_oublock, 0);
254
255 /* (6) The UID and GID of the process */
256 acct.ac_uid = p->p_ucred->cr_ruid;
257 acct.ac_gid = p->p_ucred->cr_rgid;
258
259 /* (7) The terminal from which the process was started */
260 PROC_LOCK(p);
261 SESS_LOCK(p->p_session);
262 if ((p->p_flag & P_CONTROLT) && p->p_pgrp->pg_session->s_ttyp)
263 acct.ac_tty = dev2udev(p->p_pgrp->pg_session->s_ttyp->t_dev);
264 else
265 acct.ac_tty = NOUDEV;
266 SESS_UNLOCK(p->p_session);
267 PROC_UNLOCK(p);
268
269 /* (8) The boolean flags that tell how the process terminated, etc. */
270 acct.ac_flag = p->p_acflag;
271
272 /*
273 * Eliminate any file size rlimit.
274 */
275 if (p->p_limit->p_refcnt > 1 &&
276 (p->p_limit->p_lflags & PL_SHAREMOD) == 0) {
277 p->p_limit->p_refcnt--;
278 p->p_limit = limcopy(p->p_limit);
279 }
280 p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
281
282 /*
283 * Write the accounting information to the file.
284 */
285 uc = crhold(acctcred);
286 vref(vp);
287 mtx_unlock(&acct_mtx);
288 VOP_LEASE(vp, td, uc, LEASE_WRITE);
289 ret = vn_rdwr(UIO_WRITE, vp, (caddr_t)&acct, sizeof (acct),
290 (off_t)0, UIO_SYSSPACE, IO_APPEND|IO_UNIT, uc, NOCRED,
291 (int *)0, td);
292 vrele(vp);
293 crfree(uc);
294 return (ret);
295}
296
297/*
298 * Encode_comp_t converts from ticks in seconds and microseconds
299 * to ticks in 1/AHZ seconds. The encoding is described in
300 * Leffler, et al., on page 63.
301 */
302
303#define MANTSIZE 13 /* 13 bit mantissa. */
304#define EXPSIZE 3 /* Base 8 (3 bit) exponent. */
305#define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */
306
307static comp_t
308encode_comp_t(s, us)
309 u_long s, us;
310{
311 int exp, rnd;
312
313 exp = 0;
314 rnd = 0;
315 s *= AHZ;
316 s += us / (1000000 / AHZ); /* Maximize precision. */
317
318 while (s > MAXFRACT) {
319 rnd = s & (1 << (EXPSIZE - 1)); /* Round up? */
320 s >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */
321 exp++;
322 }
323
324 /* If we need to round up, do it (and handle overflow correctly). */
325 if (rnd && (++s > MAXFRACT)) {
326 s >>= EXPSIZE;
327 exp++;
328 }
329
330 /* Clean it up and polish it off. */
331 exp <<= MANTSIZE; /* Shift the exponent into place */
332 exp += s; /* and add on the mantissa. */
333 return (exp);
334}
335
336/*
337 * Periodically check the filesystem to see if accounting
338 * should be turned on or off. Beware the case where the vnode
339 * has been vgone()'d out from underneath us, e.g. when the file
340 * system containing the accounting file has been forcibly unmounted.
341 */
342/* ARGSUSED */
343static void
344acctwatch(a)
345 void *a;
346{
347 struct statfs sb;
348
349 mtx_lock(&acct_mtx);
350
351 /*
352 * XXX arr: Need to fix the issue of holding acct_mtx over
353 * the below vnode operations.
354 */
355
356 if (savacctp != NULLVP) {
357 if (savacctp->v_type == VBAD) {
358 (void) vn_close(savacctp, savacctflags, savacctcred,
359 NULL);
360 savacctp = NULLVP;
361 savacctcred = NOCRED;
362 mtx_unlock(&acct_mtx);
363 return;
364 }
365 (void)VFS_STATFS(savacctp->v_mount, &sb, (struct thread *)0);
366 if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
367 acctp = savacctp;
368 acctcred = savacctcred;
369 acctflags = savacctflags;
370 savacctp = NULLVP;
371 savacctcred = NOCRED;
372 log(LOG_NOTICE, "Accounting resumed\n");
373 }
374 } else {
375 if (acctp == NULLVP) {
376 mtx_unlock(&acct_mtx);
377 return;
378 }
379 if (acctp->v_type == VBAD) {
380 (void) vn_close(acctp, acctflags, acctcred, NULL);
381 acctp = NULLVP;
382 crfree(acctcred);
383 acctcred = NOCRED;
384 mtx_unlock(&acct_mtx);
385 return;
386 }
387 (void)VFS_STATFS(acctp->v_mount, &sb, (struct thread *)0);
388 if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
389 savacctp = acctp;
390 savacctflags = acctflags;
391 savacctcred = acctcred;
392 acctp = NULLVP;
393 acctcred = NOCRED;
394 log(LOG_NOTICE, "Accounting suspended\n");
395 }
396 }
397 callout_reset(&acctwatch_callout, acctchkfreq * hz, acctwatch, NULL);
398 mtx_unlock(&acct_mtx);
399}
| 169 }
170
171 /*
172 * If accounting was previously enabled, kill the old space-watcher,
173 * close the file, and (if no new file was specified, leave).
174 */
175
176 /*
177 * XXX arr: Should not hold lock over vnode operation.
178 */
179
180 mtx_lock(&acct_mtx);
181 if (acctp != NULLVP || savacctp != NULLVP) {
182 callout_stop(&acctwatch_callout);
183 error = vn_close((acctp != NULLVP ? acctp : savacctp),
184 (acctp != NULLVP ? acctflags : savacctflags),
185 (acctcred != NOCRED ? acctcred : savacctcred), td);
186 acctp = savacctp = NULLVP;
187 crfree(acctcred != NOCRED ? acctcred : savacctcred);
188 acctcred = savacctcred = NOCRED;
189 }
190 if (SCARG(uap, path) == NULL) {
191 mtx_unlock(&acct_mtx);
192 goto done2;
193 }
194
195 /*
196 * Save the new accounting file vnode, and schedule the new
197 * free space watcher.
198 */
199 acctp = nd.ni_vp;
200 acctcred = crhold(td->td_ucred);
201 acctflags = flags;
202 callout_init(&acctwatch_callout, 0);
203 mtx_unlock(&acct_mtx);
204 acctwatch(NULL);
205done2:
206 mtx_unlock(&Giant);
207 return (error);
208}
209
210/*
211 * Write out process accounting information, on process exit.
212 * Data to be written out is specified in Leffler, et al.
213 * and are enumerated below. (They're also noted in the system
214 * "acct.h" header file.)
215 */
216
217int
218acct_process(td)
219 struct thread *td;
220{
221 struct proc *p = td->td_proc;
222 struct acct acct;
223 struct rusage *r;
224 struct timeval ut, st, tmp;
225 int t, ret;
226 struct vnode *vp;
227 struct ucred *uc;
228
229 mtx_lock(&acct_mtx);
230
231 /* If accounting isn't enabled, don't bother */
232 vp = acctp;
233 if (vp == NULLVP) {
234 mtx_unlock(&acct_mtx);
235 return (0);
236 }
237
238 /*
239 * Get process accounting information.
240 */
241
242 /* (1) The name of the command that ran */
243 bcopy(p->p_comm, acct.ac_comm, sizeof acct.ac_comm);
244
245 /* (2) The amount of user and system time that was used */
246 mtx_lock_spin(&sched_lock);
247 calcru(p, &ut, &st, NULL);
248 mtx_unlock_spin(&sched_lock);
249 acct.ac_utime = encode_comp_t(ut.tv_sec, ut.tv_usec);
250 acct.ac_stime = encode_comp_t(st.tv_sec, st.tv_usec);
251
252 /* (3) The elapsed time the commmand ran (and its starting time) */
253 acct.ac_btime = p->p_stats->p_start.tv_sec;
254 microtime(&tmp);
255 timevalsub(&tmp, &p->p_stats->p_start);
256 acct.ac_etime = encode_comp_t(tmp.tv_sec, tmp.tv_usec);
257
258 /* (4) The average amount of memory used */
259 r = &p->p_stats->p_ru;
260 tmp = ut;
261 timevaladd(&tmp, &st);
262 t = tmp.tv_sec * hz + tmp.tv_usec / tick;
263 if (t)
264 acct.ac_mem = (r->ru_ixrss + r->ru_idrss + r->ru_isrss) / t;
265 else
266 acct.ac_mem = 0;
267
268 /* (5) The number of disk I/O operations done */
269 acct.ac_io = encode_comp_t(r->ru_inblock + r->ru_oublock, 0);
270
271 /* (6) The UID and GID of the process */
272 acct.ac_uid = p->p_ucred->cr_ruid;
273 acct.ac_gid = p->p_ucred->cr_rgid;
274
275 /* (7) The terminal from which the process was started */
276 PROC_LOCK(p);
277 SESS_LOCK(p->p_session);
278 if ((p->p_flag & P_CONTROLT) && p->p_pgrp->pg_session->s_ttyp)
279 acct.ac_tty = dev2udev(p->p_pgrp->pg_session->s_ttyp->t_dev);
280 else
281 acct.ac_tty = NOUDEV;
282 SESS_UNLOCK(p->p_session);
283 PROC_UNLOCK(p);
284
285 /* (8) The boolean flags that tell how the process terminated, etc. */
286 acct.ac_flag = p->p_acflag;
287
288 /*
289 * Eliminate any file size rlimit.
290 */
291 if (p->p_limit->p_refcnt > 1 &&
292 (p->p_limit->p_lflags & PL_SHAREMOD) == 0) {
293 p->p_limit->p_refcnt--;
294 p->p_limit = limcopy(p->p_limit);
295 }
296 p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
297
298 /*
299 * Write the accounting information to the file.
300 */
301 uc = crhold(acctcred);
302 vref(vp);
303 mtx_unlock(&acct_mtx);
304 VOP_LEASE(vp, td, uc, LEASE_WRITE);
305 ret = vn_rdwr(UIO_WRITE, vp, (caddr_t)&acct, sizeof (acct),
306 (off_t)0, UIO_SYSSPACE, IO_APPEND|IO_UNIT, uc, NOCRED,
307 (int *)0, td);
308 vrele(vp);
309 crfree(uc);
310 return (ret);
311}
312
313/*
314 * Encode_comp_t converts from ticks in seconds and microseconds
315 * to ticks in 1/AHZ seconds. The encoding is described in
316 * Leffler, et al., on page 63.
317 */
318
319#define MANTSIZE 13 /* 13 bit mantissa. */
320#define EXPSIZE 3 /* Base 8 (3 bit) exponent. */
321#define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */
322
323static comp_t
324encode_comp_t(s, us)
325 u_long s, us;
326{
327 int exp, rnd;
328
329 exp = 0;
330 rnd = 0;
331 s *= AHZ;
332 s += us / (1000000 / AHZ); /* Maximize precision. */
333
334 while (s > MAXFRACT) {
335 rnd = s & (1 << (EXPSIZE - 1)); /* Round up? */
336 s >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */
337 exp++;
338 }
339
340 /* If we need to round up, do it (and handle overflow correctly). */
341 if (rnd && (++s > MAXFRACT)) {
342 s >>= EXPSIZE;
343 exp++;
344 }
345
346 /* Clean it up and polish it off. */
347 exp <<= MANTSIZE; /* Shift the exponent into place */
348 exp += s; /* and add on the mantissa. */
349 return (exp);
350}
351
352/*
353 * Periodically check the filesystem to see if accounting
354 * should be turned on or off. Beware the case where the vnode
355 * has been vgone()'d out from underneath us, e.g. when the file
356 * system containing the accounting file has been forcibly unmounted.
357 */
358/* ARGSUSED */
359static void
360acctwatch(a)
361 void *a;
362{
363 struct statfs sb;
364
365 mtx_lock(&acct_mtx);
366
367 /*
368 * XXX arr: Need to fix the issue of holding acct_mtx over
369 * the below vnode operations.
370 */
371
372 if (savacctp != NULLVP) {
373 if (savacctp->v_type == VBAD) {
374 (void) vn_close(savacctp, savacctflags, savacctcred,
375 NULL);
376 savacctp = NULLVP;
377 savacctcred = NOCRED;
378 mtx_unlock(&acct_mtx);
379 return;
380 }
381 (void)VFS_STATFS(savacctp->v_mount, &sb, (struct thread *)0);
382 if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
383 acctp = savacctp;
384 acctcred = savacctcred;
385 acctflags = savacctflags;
386 savacctp = NULLVP;
387 savacctcred = NOCRED;
388 log(LOG_NOTICE, "Accounting resumed\n");
389 }
390 } else {
391 if (acctp == NULLVP) {
392 mtx_unlock(&acct_mtx);
393 return;
394 }
395 if (acctp->v_type == VBAD) {
396 (void) vn_close(acctp, acctflags, acctcred, NULL);
397 acctp = NULLVP;
398 crfree(acctcred);
399 acctcred = NOCRED;
400 mtx_unlock(&acct_mtx);
401 return;
402 }
403 (void)VFS_STATFS(acctp->v_mount, &sb, (struct thread *)0);
404 if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
405 savacctp = acctp;
406 savacctflags = acctflags;
407 savacctcred = acctcred;
408 acctp = NULLVP;
409 acctcred = NOCRED;
410 log(LOG_NOTICE, "Accounting suspended\n");
411 }
412 }
413 callout_reset(&acctwatch_callout, acctchkfreq * hz, acctwatch, NULL);
414 mtx_unlock(&acct_mtx);
415}
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