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 */
41
42#include <sys/cdefs.h>
| 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 */
41
42#include <sys/cdefs.h>
|
44
45#include "opt_mac.h"
46
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/lock.h>
50#include <sys/mutex.h>
51#include <sys/sysproto.h>
52#include <sys/proc.h>
53#include <sys/mac.h>
54#include <sys/mount.h>
55#include <sys/vnode.h>
56#include <sys/fcntl.h>
57#include <sys/syslog.h>
58#include <sys/kernel.h>
59#include <sys/sysent.h>
60#include <sys/sysctl.h>
61#include <sys/namei.h>
62#include <sys/acct.h>
63#include <sys/resourcevar.h>
64#include <sys/tty.h>
65
66/*
67 * The routines implemented in this file are described in:
68 * Leffler, et al.: The Design and Implementation of the 4.3BSD
69 * UNIX Operating System (Addison Welley, 1989)
70 * on pages 62-63.
71 *
72 * Arguably, to simplify accounting operations, this mechanism should
73 * be replaced by one in which an accounting log file (similar to /dev/klog)
74 * is read by a user process, etc. However, that has its own problems.
75 */
76
77/*
78 * Internal accounting functions.
79 * The former's operation is described in Leffler, et al., and the latter
80 * was provided by UCB with the 4.4BSD-Lite release
81 */
82static comp_t encode_comp_t(u_long, u_long);
83static void acctwatch(void *);
84
85/*
86 * Accounting callout used for periodic scheduling of acctwatch.
87 */
88static struct callout acctwatch_callout;
89
90/*
91 * Accounting vnode pointer, saved vnode pointer, and flags for each.
92 */
93static struct vnode *acctp;
94static struct ucred *acctcred;
95static int acctflags;
96static struct vnode *savacctp;
97static struct ucred *savacctcred;
98static int savacctflags;
99
100static struct mtx acct_mtx;
101MTX_SYSINIT(acct, &acct_mtx, "accounting", MTX_DEF);
102
103/*
104 * Values associated with enabling and disabling accounting
105 */
106static int acctsuspend = 2; /* stop accounting when < 2% free space left */
107SYSCTL_INT(_kern, OID_AUTO, acct_suspend, CTLFLAG_RW,
108 &acctsuspend, 0, "percentage of free disk space below which accounting stops");
109
110static int acctresume = 4; /* resume when free space risen to > 4% */
111SYSCTL_INT(_kern, OID_AUTO, acct_resume, CTLFLAG_RW,
112 &acctresume, 0, "percentage of free disk space above which accounting resumes");
113
114static int acctchkfreq = 15; /* frequency (in seconds) to check space */
115SYSCTL_INT(_kern, OID_AUTO, acct_chkfreq, CTLFLAG_RW,
116 &acctchkfreq, 0, "frequency for checking the free space");
117
118/*
119 * Accounting system call. Written based on the specification and
120 * previous implementation done by Mark Tinguely.
121 *
122 * MPSAFE
123 */
124int
125acct(td, uap)
126 struct thread *td;
127 struct acct_args /* {
128 char *path;
129 } */ *uap;
130{
131 struct nameidata nd;
132 int error, flags;
133
134 /* Make sure that the caller is root. */
135 error = suser(td);
136 if (error)
137 return (error);
138
139 mtx_lock(&Giant);
140
141 /*
142 * If accounting is to be started to a file, open that file for
143 * appending and make sure it's a 'normal'.
144 */
145 if (uap->path != NULL) {
146 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
147 flags = FWRITE | O_APPEND;
148 error = vn_open(&nd, &flags, 0, -1);
149 if (error)
150 goto done2;
151 NDFREE(&nd, NDF_ONLY_PNBUF);
152#ifdef MAC
153 error = mac_check_system_acct(td->td_ucred, nd.ni_vp);
154 if (error) {
155 vn_close(nd.ni_vp, flags, td->td_ucred, td);
156 goto done2;
157 }
158#endif
159 VOP_UNLOCK(nd.ni_vp, 0, td);
160 if (nd.ni_vp->v_type != VREG) {
161 vn_close(nd.ni_vp, flags, td->td_ucred, td);
162 error = EACCES;
163 goto done2;
164 }
165#ifdef MAC
166 } else {
167 error = mac_check_system_acct(td->td_ucred, NULL);
168 if (error)
169 goto done2;
170#endif
171 }
172
173 mtx_lock(&acct_mtx);
174
175 /*
176 * If accounting was previously enabled, kill the old space-watcher,
177 * close the file, and (if no new file was specified, leave).
178 *
179 * XXX arr: should not hold lock over vnode operation.
180 */
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 log(LOG_NOTICE, "Accounting disabled\n");
190 }
191 if (uap->path == NULL) {
192 mtx_unlock(&acct_mtx);
193 goto done2;
194 }
195
196 /*
197 * Save the new accounting file vnode, and schedule the new
198 * free space watcher.
199 */
200 acctp = nd.ni_vp;
201 acctcred = crhold(td->td_ucred);
202 acctflags = flags;
203 callout_init(&acctwatch_callout, 0);
204 mtx_unlock(&acct_mtx);
205 log(LOG_NOTICE, "Accounting enabled\n");
206 acctwatch(NULL);
207
208done2:
209 mtx_unlock(&Giant);
210 return (error);
211}
212
213/*
214 * Write out process accounting information, on process exit.
215 * Data to be written out is specified in Leffler, et al.
216 * and are enumerated below. (They're also noted in the system
217 * "acct.h" header file.)
218 */
219int
220acct_process(td)
221 struct thread *td;
222{
223 struct acct acct;
224 struct timeval ut, st, tmp;
225 struct plimit *newlim, *oldlim;
226 struct proc *p;
227 struct rusage *r;
228 struct ucred *uc;
229 struct vnode *vp;
230 int t, ret;
231
232 mtx_lock(&acct_mtx);
233
234 /* If accounting isn't enabled, don't bother */
235 vp = acctp;
236 if (vp == NULLVP) {
237 mtx_unlock(&acct_mtx);
238 return (0);
239 }
240
241 p = td->td_proc;
242
243 /*
244 * Get process accounting information.
245 */
246
247 PROC_LOCK(p);
248 /* (1) The name of the command that ran */
249 bcopy(p->p_comm, acct.ac_comm, sizeof acct.ac_comm);
250
251 /* (2) The amount of user and system time that was used */
252 mtx_lock_spin(&sched_lock);
253 calcru(p, &ut, &st, NULL);
254 mtx_unlock_spin(&sched_lock);
255 acct.ac_utime = encode_comp_t(ut.tv_sec, ut.tv_usec);
256 acct.ac_stime = encode_comp_t(st.tv_sec, st.tv_usec);
257
258 /* (3) The elapsed time the command ran (and its starting time) */
259 tmp = boottime;
260 timevaladd(&tmp, &p->p_stats->p_start);
261 acct.ac_btime = tmp.tv_sec;
262 microuptime(&tmp);
263 timevalsub(&tmp, &p->p_stats->p_start);
264 acct.ac_etime = encode_comp_t(tmp.tv_sec, tmp.tv_usec);
265
266 /* (4) The average amount of memory used */
267 r = &p->p_stats->p_ru;
268 tmp = ut;
269 timevaladd(&tmp, &st);
270 t = tmp.tv_sec * hz + tmp.tv_usec / tick;
271 if (t)
272 acct.ac_mem = (r->ru_ixrss + r->ru_idrss + r->ru_isrss) / t;
273 else
274 acct.ac_mem = 0;
275
276 /* (5) The number of disk I/O operations done */
277 acct.ac_io = encode_comp_t(r->ru_inblock + r->ru_oublock, 0);
278
279 /* (6) The UID and GID of the process */
280 acct.ac_uid = p->p_ucred->cr_ruid;
281 acct.ac_gid = p->p_ucred->cr_rgid;
282
283 /* (7) The terminal from which the process was started */
284 SESS_LOCK(p->p_session);
285 if ((p->p_flag & P_CONTROLT) && p->p_pgrp->pg_session->s_ttyp)
286 acct.ac_tty = dev2udev(p->p_pgrp->pg_session->s_ttyp->t_dev);
287 else
| 44
45#include "opt_mac.h"
46
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/lock.h>
50#include <sys/mutex.h>
51#include <sys/sysproto.h>
52#include <sys/proc.h>
53#include <sys/mac.h>
54#include <sys/mount.h>
55#include <sys/vnode.h>
56#include <sys/fcntl.h>
57#include <sys/syslog.h>
58#include <sys/kernel.h>
59#include <sys/sysent.h>
60#include <sys/sysctl.h>
61#include <sys/namei.h>
62#include <sys/acct.h>
63#include <sys/resourcevar.h>
64#include <sys/tty.h>
65
66/*
67 * The routines implemented in this file are described in:
68 * Leffler, et al.: The Design and Implementation of the 4.3BSD
69 * UNIX Operating System (Addison Welley, 1989)
70 * on pages 62-63.
71 *
72 * Arguably, to simplify accounting operations, this mechanism should
73 * be replaced by one in which an accounting log file (similar to /dev/klog)
74 * is read by a user process, etc. However, that has its own problems.
75 */
76
77/*
78 * Internal accounting functions.
79 * The former's operation is described in Leffler, et al., and the latter
80 * was provided by UCB with the 4.4BSD-Lite release
81 */
82static comp_t encode_comp_t(u_long, u_long);
83static void acctwatch(void *);
84
85/*
86 * Accounting callout used for periodic scheduling of acctwatch.
87 */
88static struct callout acctwatch_callout;
89
90/*
91 * Accounting vnode pointer, saved vnode pointer, and flags for each.
92 */
93static struct vnode *acctp;
94static struct ucred *acctcred;
95static int acctflags;
96static struct vnode *savacctp;
97static struct ucred *savacctcred;
98static int savacctflags;
99
100static struct mtx acct_mtx;
101MTX_SYSINIT(acct, &acct_mtx, "accounting", MTX_DEF);
102
103/*
104 * Values associated with enabling and disabling accounting
105 */
106static int acctsuspend = 2; /* stop accounting when < 2% free space left */
107SYSCTL_INT(_kern, OID_AUTO, acct_suspend, CTLFLAG_RW,
108 &acctsuspend, 0, "percentage of free disk space below which accounting stops");
109
110static int acctresume = 4; /* resume when free space risen to > 4% */
111SYSCTL_INT(_kern, OID_AUTO, acct_resume, CTLFLAG_RW,
112 &acctresume, 0, "percentage of free disk space above which accounting resumes");
113
114static int acctchkfreq = 15; /* frequency (in seconds) to check space */
115SYSCTL_INT(_kern, OID_AUTO, acct_chkfreq, CTLFLAG_RW,
116 &acctchkfreq, 0, "frequency for checking the free space");
117
118/*
119 * Accounting system call. Written based on the specification and
120 * previous implementation done by Mark Tinguely.
121 *
122 * MPSAFE
123 */
124int
125acct(td, uap)
126 struct thread *td;
127 struct acct_args /* {
128 char *path;
129 } */ *uap;
130{
131 struct nameidata nd;
132 int error, flags;
133
134 /* Make sure that the caller is root. */
135 error = suser(td);
136 if (error)
137 return (error);
138
139 mtx_lock(&Giant);
140
141 /*
142 * If accounting is to be started to a file, open that file for
143 * appending and make sure it's a 'normal'.
144 */
145 if (uap->path != NULL) {
146 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
147 flags = FWRITE | O_APPEND;
148 error = vn_open(&nd, &flags, 0, -1);
149 if (error)
150 goto done2;
151 NDFREE(&nd, NDF_ONLY_PNBUF);
152#ifdef MAC
153 error = mac_check_system_acct(td->td_ucred, nd.ni_vp);
154 if (error) {
155 vn_close(nd.ni_vp, flags, td->td_ucred, td);
156 goto done2;
157 }
158#endif
159 VOP_UNLOCK(nd.ni_vp, 0, td);
160 if (nd.ni_vp->v_type != VREG) {
161 vn_close(nd.ni_vp, flags, td->td_ucred, td);
162 error = EACCES;
163 goto done2;
164 }
165#ifdef MAC
166 } else {
167 error = mac_check_system_acct(td->td_ucred, NULL);
168 if (error)
169 goto done2;
170#endif
171 }
172
173 mtx_lock(&acct_mtx);
174
175 /*
176 * If accounting was previously enabled, kill the old space-watcher,
177 * close the file, and (if no new file was specified, leave).
178 *
179 * XXX arr: should not hold lock over vnode operation.
180 */
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 log(LOG_NOTICE, "Accounting disabled\n");
190 }
191 if (uap->path == NULL) {
192 mtx_unlock(&acct_mtx);
193 goto done2;
194 }
195
196 /*
197 * Save the new accounting file vnode, and schedule the new
198 * free space watcher.
199 */
200 acctp = nd.ni_vp;
201 acctcred = crhold(td->td_ucred);
202 acctflags = flags;
203 callout_init(&acctwatch_callout, 0);
204 mtx_unlock(&acct_mtx);
205 log(LOG_NOTICE, "Accounting enabled\n");
206 acctwatch(NULL);
207
208done2:
209 mtx_unlock(&Giant);
210 return (error);
211}
212
213/*
214 * Write out process accounting information, on process exit.
215 * Data to be written out is specified in Leffler, et al.
216 * and are enumerated below. (They're also noted in the system
217 * "acct.h" header file.)
218 */
219int
220acct_process(td)
221 struct thread *td;
222{
223 struct acct acct;
224 struct timeval ut, st, tmp;
225 struct plimit *newlim, *oldlim;
226 struct proc *p;
227 struct rusage *r;
228 struct ucred *uc;
229 struct vnode *vp;
230 int t, ret;
231
232 mtx_lock(&acct_mtx);
233
234 /* If accounting isn't enabled, don't bother */
235 vp = acctp;
236 if (vp == NULLVP) {
237 mtx_unlock(&acct_mtx);
238 return (0);
239 }
240
241 p = td->td_proc;
242
243 /*
244 * Get process accounting information.
245 */
246
247 PROC_LOCK(p);
248 /* (1) The name of the command that ran */
249 bcopy(p->p_comm, acct.ac_comm, sizeof acct.ac_comm);
250
251 /* (2) The amount of user and system time that was used */
252 mtx_lock_spin(&sched_lock);
253 calcru(p, &ut, &st, NULL);
254 mtx_unlock_spin(&sched_lock);
255 acct.ac_utime = encode_comp_t(ut.tv_sec, ut.tv_usec);
256 acct.ac_stime = encode_comp_t(st.tv_sec, st.tv_usec);
257
258 /* (3) The elapsed time the command ran (and its starting time) */
259 tmp = boottime;
260 timevaladd(&tmp, &p->p_stats->p_start);
261 acct.ac_btime = tmp.tv_sec;
262 microuptime(&tmp);
263 timevalsub(&tmp, &p->p_stats->p_start);
264 acct.ac_etime = encode_comp_t(tmp.tv_sec, tmp.tv_usec);
265
266 /* (4) The average amount of memory used */
267 r = &p->p_stats->p_ru;
268 tmp = ut;
269 timevaladd(&tmp, &st);
270 t = tmp.tv_sec * hz + tmp.tv_usec / tick;
271 if (t)
272 acct.ac_mem = (r->ru_ixrss + r->ru_idrss + r->ru_isrss) / t;
273 else
274 acct.ac_mem = 0;
275
276 /* (5) The number of disk I/O operations done */
277 acct.ac_io = encode_comp_t(r->ru_inblock + r->ru_oublock, 0);
278
279 /* (6) The UID and GID of the process */
280 acct.ac_uid = p->p_ucred->cr_ruid;
281 acct.ac_gid = p->p_ucred->cr_rgid;
282
283 /* (7) The terminal from which the process was started */
284 SESS_LOCK(p->p_session);
285 if ((p->p_flag & P_CONTROLT) && p->p_pgrp->pg_session->s_ttyp)
286 acct.ac_tty = dev2udev(p->p_pgrp->pg_session->s_ttyp->t_dev);
287 else
|
289 SESS_UNLOCK(p->p_session);
290
291 /* (8) The boolean flags that tell how the process terminated, etc. */
292 acct.ac_flag = p->p_acflag;
293 PROC_UNLOCK(p);
294
295 /*
296 * Finish doing things that require acct_mtx, and release acct_mtx.
297 */
298 uc = crhold(acctcred);
299 vref(vp);
300 mtx_unlock(&acct_mtx);
301
302 /*
303 * Eliminate any file size rlimit.
304 */
305 newlim = lim_alloc();
306 PROC_LOCK(p);
307 oldlim = p->p_limit;
308 lim_copy(newlim, oldlim);
309 newlim->pl_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
310 p->p_limit = newlim;
311 PROC_UNLOCK(p);
312 lim_free(oldlim);
313
314 /*
315 * Write the accounting information to the file.
316 */
317 VOP_LEASE(vp, td, uc, LEASE_WRITE);
318 ret = vn_rdwr(UIO_WRITE, vp, (caddr_t)&acct, sizeof (acct),
319 (off_t)0, UIO_SYSSPACE, IO_APPEND|IO_UNIT, uc, NOCRED,
320 (int *)0, td);
321 vrele(vp);
322 crfree(uc);
323 return (ret);
324}
325
326/*
327 * Encode_comp_t converts from ticks in seconds and microseconds
328 * to ticks in 1/AHZ seconds. The encoding is described in
329 * Leffler, et al., on page 63.
330 */
331
332#define MANTSIZE 13 /* 13 bit mantissa. */
333#define EXPSIZE 3 /* Base 8 (3 bit) exponent. */
334#define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */
335
336static comp_t
337encode_comp_t(s, us)
338 u_long s, us;
339{
340 int exp, rnd;
341
342 exp = 0;
343 rnd = 0;
344 s *= AHZ;
345 s += us / (1000000 / AHZ); /* Maximize precision. */
346
347 while (s > MAXFRACT) {
348 rnd = s & (1 << (EXPSIZE - 1)); /* Round up? */
349 s >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */
350 exp++;
351 }
352
353 /* If we need to round up, do it (and handle overflow correctly). */
354 if (rnd && (++s > MAXFRACT)) {
355 s >>= EXPSIZE;
356 exp++;
357 }
358
359 /* Clean it up and polish it off. */
360 exp <<= MANTSIZE; /* Shift the exponent into place */
361 exp += s; /* and add on the mantissa. */
362 return (exp);
363}
364
365/*
366 * Periodically check the filesystem to see if accounting
367 * should be turned on or off. Beware the case where the vnode
368 * has been vgone()'d out from underneath us, e.g. when the file
369 * system containing the accounting file has been forcibly unmounted.
370 */
371/* ARGSUSED */
372static void
373acctwatch(a)
374 void *a;
375{
376 struct statfs sb;
377
378 mtx_lock(&acct_mtx);
379
380 /*
381 * XXX arr: need to fix the issue of holding acct_mtx over
382 * the below vnode operations.
383 */
384 if (savacctp != NULLVP) {
385 if (savacctp->v_type == VBAD) {
386 (void) vn_close(savacctp, savacctflags, savacctcred,
387 NULL);
388 savacctp = NULLVP;
389 savacctcred = NOCRED;
390 mtx_unlock(&acct_mtx);
391 return;
392 }
393 (void)VFS_STATFS(savacctp->v_mount, &sb, (struct thread *)0);
394 if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
395 acctp = savacctp;
396 acctcred = savacctcred;
397 acctflags = savacctflags;
398 savacctp = NULLVP;
399 savacctcred = NOCRED;
400 log(LOG_NOTICE, "Accounting resumed\n");
401 }
402 } else {
403 if (acctp == NULLVP) {
404 mtx_unlock(&acct_mtx);
405 return;
406 }
407 if (acctp->v_type == VBAD) {
408 (void) vn_close(acctp, acctflags, acctcred, NULL);
409 acctp = NULLVP;
410 crfree(acctcred);
411 acctcred = NOCRED;
412 mtx_unlock(&acct_mtx);
413 return;
414 }
415 (void)VFS_STATFS(acctp->v_mount, &sb, (struct thread *)0);
416 if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
417 savacctp = acctp;
418 savacctflags = acctflags;
419 savacctcred = acctcred;
420 acctp = NULLVP;
421 acctcred = NOCRED;
422 log(LOG_NOTICE, "Accounting suspended\n");
423 }
424 }
425 callout_reset(&acctwatch_callout, acctchkfreq * hz, acctwatch, NULL);
426 mtx_unlock(&acct_mtx);
427}
| 289 SESS_UNLOCK(p->p_session);
290
291 /* (8) The boolean flags that tell how the process terminated, etc. */
292 acct.ac_flag = p->p_acflag;
293 PROC_UNLOCK(p);
294
295 /*
296 * Finish doing things that require acct_mtx, and release acct_mtx.
297 */
298 uc = crhold(acctcred);
299 vref(vp);
300 mtx_unlock(&acct_mtx);
301
302 /*
303 * Eliminate any file size rlimit.
304 */
305 newlim = lim_alloc();
306 PROC_LOCK(p);
307 oldlim = p->p_limit;
308 lim_copy(newlim, oldlim);
309 newlim->pl_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
310 p->p_limit = newlim;
311 PROC_UNLOCK(p);
312 lim_free(oldlim);
313
314 /*
315 * Write the accounting information to the file.
316 */
317 VOP_LEASE(vp, td, uc, LEASE_WRITE);
318 ret = vn_rdwr(UIO_WRITE, vp, (caddr_t)&acct, sizeof (acct),
319 (off_t)0, UIO_SYSSPACE, IO_APPEND|IO_UNIT, uc, NOCRED,
320 (int *)0, td);
321 vrele(vp);
322 crfree(uc);
323 return (ret);
324}
325
326/*
327 * Encode_comp_t converts from ticks in seconds and microseconds
328 * to ticks in 1/AHZ seconds. The encoding is described in
329 * Leffler, et al., on page 63.
330 */
331
332#define MANTSIZE 13 /* 13 bit mantissa. */
333#define EXPSIZE 3 /* Base 8 (3 bit) exponent. */
334#define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */
335
336static comp_t
337encode_comp_t(s, us)
338 u_long s, us;
339{
340 int exp, rnd;
341
342 exp = 0;
343 rnd = 0;
344 s *= AHZ;
345 s += us / (1000000 / AHZ); /* Maximize precision. */
346
347 while (s > MAXFRACT) {
348 rnd = s & (1 << (EXPSIZE - 1)); /* Round up? */
349 s >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */
350 exp++;
351 }
352
353 /* If we need to round up, do it (and handle overflow correctly). */
354 if (rnd && (++s > MAXFRACT)) {
355 s >>= EXPSIZE;
356 exp++;
357 }
358
359 /* Clean it up and polish it off. */
360 exp <<= MANTSIZE; /* Shift the exponent into place */
361 exp += s; /* and add on the mantissa. */
362 return (exp);
363}
364
365/*
366 * Periodically check the filesystem to see if accounting
367 * should be turned on or off. Beware the case where the vnode
368 * has been vgone()'d out from underneath us, e.g. when the file
369 * system containing the accounting file has been forcibly unmounted.
370 */
371/* ARGSUSED */
372static void
373acctwatch(a)
374 void *a;
375{
376 struct statfs sb;
377
378 mtx_lock(&acct_mtx);
379
380 /*
381 * XXX arr: need to fix the issue of holding acct_mtx over
382 * the below vnode operations.
383 */
384 if (savacctp != NULLVP) {
385 if (savacctp->v_type == VBAD) {
386 (void) vn_close(savacctp, savacctflags, savacctcred,
387 NULL);
388 savacctp = NULLVP;
389 savacctcred = NOCRED;
390 mtx_unlock(&acct_mtx);
391 return;
392 }
393 (void)VFS_STATFS(savacctp->v_mount, &sb, (struct thread *)0);
394 if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
395 acctp = savacctp;
396 acctcred = savacctcred;
397 acctflags = savacctflags;
398 savacctp = NULLVP;
399 savacctcred = NOCRED;
400 log(LOG_NOTICE, "Accounting resumed\n");
401 }
402 } else {
403 if (acctp == NULLVP) {
404 mtx_unlock(&acct_mtx);
405 return;
406 }
407 if (acctp->v_type == VBAD) {
408 (void) vn_close(acctp, acctflags, acctcred, NULL);
409 acctp = NULLVP;
410 crfree(acctcred);
411 acctcred = NOCRED;
412 mtx_unlock(&acct_mtx);
413 return;
414 }
415 (void)VFS_STATFS(acctp->v_mount, &sb, (struct thread *)0);
416 if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
417 savacctp = acctp;
418 savacctflags = acctflags;
419 savacctcred = acctcred;
420 acctp = NULLVP;
421 acctcred = NOCRED;
422 log(LOG_NOTICE, "Accounting suspended\n");
423 }
424 }
425 callout_reset(&acctwatch_callout, acctchkfreq * hz, acctwatch, NULL);
426 mtx_unlock(&acct_mtx);
427}
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