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bsdacct: turn acct off for all pidns-s on umount time
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CommitLineData
1da177e4
LT
1/*
2 * linux/kernel/acct.c
3 *
4 * BSD Process Accounting for Linux
5 *
6 * Author: Marco van Wieringen <mvw@planets.elm.net>
7 *
8 * Some code based on ideas and code from:
9 * Thomas K. Dyas <tdyas@eden.rutgers.edu>
10 *
11 * This file implements BSD-style process accounting. Whenever any
12 * process exits, an accounting record of type "struct acct" is
13 * written to the file specified with the acct() system call. It is
14 * up to user-level programs to do useful things with the accounting
15 * log. The kernel just provides the raw accounting information.
16 *
17 * (C) Copyright 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
18 *
19 * Plugged two leaks. 1) It didn't return acct_file into the free_filps if
20 * the file happened to be read-only. 2) If the accounting was suspended
21 * due to the lack of space it happily allowed to reopen it and completely
22 * lost the old acct_file. 3/10/98, Al Viro.
23 *
24 * Now we silently close acct_file on attempt to reopen. Cleaned sys_acct().
25 * XTerms and EMACS are manifestations of pure evil. 21/10/98, AV.
26 *
27 * Fixed a nasty interaction with with sys_umount(). If the accointing
28 * was suspeneded we failed to stop it on umount(). Messy.
29 * Another one: remount to readonly didn't stop accounting.
30 * Question: what should we do if we have CAP_SYS_ADMIN but not
31 * CAP_SYS_PACCT? Current code does the following: umount returns -EBUSY
32 * unless we are messing with the root. In that case we are getting a
33 * real mess with do_remount_sb(). 9/11/98, AV.
34 *
35 * Fixed a bunch of races (and pair of leaks). Probably not the best way,
36 * but this one obviously doesn't introduce deadlocks. Later. BTW, found
37 * one race (and leak) in BSD implementation.
38 * OK, that's better. ANOTHER race and leak in BSD variant. There always
39 * is one more bug... 10/11/98, AV.
40 *
41 * Oh, fsck... Oopsable SMP race in do_process_acct() - we must hold
42 * ->mmap_sem to walk the vma list of current->mm. Nasty, since it leaks
43 * a struct file opened for write. Fixed. 2/6/2000, AV.
44 */
45
1da177e4
LT
46#include <linux/mm.h>
47#include <linux/slab.h>
48#include <linux/acct.h>
c59ede7b 49#include <linux/capability.h>
1da177e4
LT
50#include <linux/file.h>
51#include <linux/tty.h>
52#include <linux/security.h>
53#include <linux/vfs.h>
54#include <linux/jiffies.h>
55#include <linux/times.h>
56#include <linux/syscalls.h>
7b7b1ace 57#include <linux/mount.h>
1da177e4
LT
58#include <asm/uaccess.h>
59#include <asm/div64.h>
60#include <linux/blkdev.h> /* sector_div */
5f7b703f 61#include <linux/pid_namespace.h>
1da177e4
LT
62
63/*
64 * These constants control the amount of freespace that suspend and
65 * resume the process accounting system, and the time delay between
66 * each check.
67 * Turned into sysctl-controllable parameters. AV, 12/11/98
68 */
69
70int acct_parm[3] = {4, 2, 30};
71#define RESUME (acct_parm[0]) /* >foo% free space - resume */
72#define SUSPEND (acct_parm[1]) /* <foo% free space - suspend */
73#define ACCT_TIMEOUT (acct_parm[2]) /* foo second timeout between checks */
74
75/*
76 * External references and all of the globals.
77 */
6248b1b3
PE
78static void do_acct_process(struct bsd_acct_struct *acct,
79 struct pid_namespace *ns, struct file *);
1da177e4
LT
80
81/*
82 * This structure is used so that all the data protected by lock
83 * can be placed in the same cache line as the lock. This primes
84 * the cache line to have the data after getting the lock.
85 */
081e4c8a 86struct bsd_acct_struct {
1da177e4
LT
87 volatile int active;
88 volatile int needcheck;
89 struct file *file;
5f7b703f 90 struct pid_namespace *ns;
1da177e4 91 struct timer_list timer;
b5a71748 92 struct list_head list;
1da177e4
LT
93};
94
a75d9797 95static DEFINE_SPINLOCK(acct_lock);
b5a71748 96static LIST_HEAD(acct_list);
a75d9797 97
1da177e4
LT
98/*
99 * Called whenever the timer says to check the free space.
100 */
e59a04a7 101static void acct_timeout(unsigned long x)
1da177e4 102{
e59a04a7
PE
103 struct bsd_acct_struct *acct = (struct bsd_acct_struct *)x;
104 acct->needcheck = 1;
1da177e4
LT
105}
106
107/*
108 * Check the amount of free space and suspend/resume accordingly.
109 */
6248b1b3 110static int check_free_space(struct bsd_acct_struct *acct, struct file *file)
1da177e4
LT
111{
112 struct kstatfs sbuf;
113 int res;
114 int act;
115 sector_t resume;
116 sector_t suspend;
117
a75d9797 118 spin_lock(&acct_lock);
6248b1b3
PE
119 res = acct->active;
120 if (!file || !acct->needcheck)
1da177e4 121 goto out;
a75d9797 122 spin_unlock(&acct_lock);
1da177e4
LT
123
124 /* May block */
f3a43f3f 125 if (vfs_statfs(file->f_path.dentry, &sbuf))
1da177e4
LT
126 return res;
127 suspend = sbuf.f_blocks * SUSPEND;
128 resume = sbuf.f_blocks * RESUME;
129
130 sector_div(suspend, 100);
131 sector_div(resume, 100);
132
133 if (sbuf.f_bavail <= suspend)
134 act = -1;
135 else if (sbuf.f_bavail >= resume)
136 act = 1;
137 else
138 act = 0;
139
140 /*
6248b1b3 141 * If some joker switched acct->file under us we'ld better be
1da177e4
LT
142 * silent and _not_ touch anything.
143 */
a75d9797 144 spin_lock(&acct_lock);
6248b1b3 145 if (file != acct->file) {
1da177e4
LT
146 if (act)
147 res = act>0;
148 goto out;
149 }
150
6248b1b3 151 if (acct->active) {
1da177e4 152 if (act < 0) {
6248b1b3 153 acct->active = 0;
1da177e4
LT
154 printk(KERN_INFO "Process accounting paused\n");
155 }
156 } else {
157 if (act > 0) {
6248b1b3 158 acct->active = 1;
1da177e4
LT
159 printk(KERN_INFO "Process accounting resumed\n");
160 }
161 }
162
6248b1b3
PE
163 del_timer(&acct->timer);
164 acct->needcheck = 0;
165 acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ;
166 add_timer(&acct->timer);
167 res = acct->active;
1da177e4 168out:
a75d9797 169 spin_unlock(&acct_lock);
1da177e4
LT
170 return res;
171}
172
173/*
417ef531 174 * Close the old accounting file (if currently open) and then replace
1da177e4
LT
175 * it with file (if non-NULL).
176 *
a75d9797 177 * NOTE: acct_lock MUST be held on entry and exit.
1da177e4 178 */
0b6b030f
PE
179static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file,
180 struct pid_namespace *ns)
1da177e4
LT
181{
182 struct file *old_acct = NULL;
5f7b703f 183 struct pid_namespace *old_ns = NULL;
1da177e4 184
6248b1b3
PE
185 if (acct->file) {
186 old_acct = acct->file;
187 old_ns = acct->ns;
188 del_timer(&acct->timer);
189 acct->active = 0;
190 acct->needcheck = 0;
191 acct->file = NULL;
0b6b030f 192 acct->ns = NULL;
b5a71748 193 list_del(&acct->list);
1da177e4
LT
194 }
195 if (file) {
6248b1b3 196 acct->file = file;
0b6b030f 197 acct->ns = ns;
6248b1b3
PE
198 acct->needcheck = 0;
199 acct->active = 1;
b5a71748 200 list_add(&acct->list, &acct_list);
1da177e4 201 /* It's been deleted if it was used before so this is safe */
6248b1b3
PE
202 setup_timer(&acct->timer, acct_timeout, (unsigned long)acct);
203 acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ;
204 add_timer(&acct->timer);
1da177e4
LT
205 }
206 if (old_acct) {
f3a43f3f 207 mnt_unpin(old_acct->f_path.mnt);
a75d9797 208 spin_unlock(&acct_lock);
6248b1b3 209 do_acct_process(acct, old_ns, old_acct);
1da177e4 210 filp_close(old_acct, NULL);
a75d9797 211 spin_lock(&acct_lock);
1da177e4
LT
212 }
213}
214
7b7b1ace
AV
215static int acct_on(char *name)
216{
217 struct file *file;
218 int error;
0b6b030f
PE
219 struct pid_namespace *ns;
220 struct bsd_acct_struct *acct = NULL;
7b7b1ace
AV
221
222 /* Difference from BSD - they don't do O_APPEND */
223 file = filp_open(name, O_WRONLY|O_APPEND|O_LARGEFILE, 0);
224 if (IS_ERR(file))
225 return PTR_ERR(file);
226
f3a43f3f 227 if (!S_ISREG(file->f_path.dentry->d_inode->i_mode)) {
7b7b1ace
AV
228 filp_close(file, NULL);
229 return -EACCES;
230 }
231
232 if (!file->f_op->write) {
233 filp_close(file, NULL);
234 return -EIO;
235 }
236
0b6b030f
PE
237 ns = task_active_pid_ns(current);
238 if (ns->bacct == NULL) {
239 acct = kzalloc(sizeof(struct bsd_acct_struct), GFP_KERNEL);
240 if (acct == NULL) {
241 filp_close(file, NULL);
242 return -ENOMEM;
243 }
244 }
245
7b7b1ace
AV
246 error = security_acct(file);
247 if (error) {
0b6b030f 248 kfree(acct);
7b7b1ace
AV
249 filp_close(file, NULL);
250 return error;
251 }
252
a75d9797 253 spin_lock(&acct_lock);
0b6b030f
PE
254 if (ns->bacct == NULL) {
255 ns->bacct = acct;
256 acct = NULL;
257 }
258
f3a43f3f 259 mnt_pin(file->f_path.mnt);
0b6b030f 260 acct_file_reopen(ns->bacct, file, ns);
a75d9797 261 spin_unlock(&acct_lock);
7b7b1ace 262
f3a43f3f 263 mntput(file->f_path.mnt); /* it's pinned, now give up active reference */
0b6b030f 264 kfree(acct);
7b7b1ace
AV
265
266 return 0;
267}
268
417ef531
RD
269/**
270 * sys_acct - enable/disable process accounting
271 * @name: file name for accounting records or NULL to shutdown accounting
272 *
273 * Returns 0 for success or negative errno values for failure.
274 *
275 * sys_acct() is the only system call needed to implement process
276 * accounting. It takes the name of the file where accounting records
277 * should be written. If the filename is NULL, accounting will be
278 * shutdown.
1da177e4
LT
279 */
280asmlinkage long sys_acct(const char __user *name)
281{
1da177e4
LT
282 int error;
283
284 if (!capable(CAP_SYS_PACCT))
285 return -EPERM;
286
287 if (name) {
7b7b1ace
AV
288 char *tmp = getname(name);
289 if (IS_ERR(tmp))
1da177e4 290 return (PTR_ERR(tmp));
7b7b1ace 291 error = acct_on(tmp);
1da177e4 292 putname(tmp);
7b7b1ace 293 } else {
0b6b030f
PE
294 struct bsd_acct_struct *acct;
295
296 acct = task_active_pid_ns(current)->bacct;
297 if (acct == NULL)
298 return 0;
299
7b7b1ace
AV
300 error = security_acct(NULL);
301 if (!error) {
a75d9797 302 spin_lock(&acct_lock);
0b6b030f 303 acct_file_reopen(acct, NULL, NULL);
a75d9797 304 spin_unlock(&acct_lock);
1da177e4
LT
305 }
306 }
7b7b1ace
AV
307 return error;
308}
1da177e4 309
7b7b1ace
AV
310/**
311 * acct_auto_close - turn off a filesystem's accounting if it is on
312 * @m: vfsmount being shut down
313 *
314 * If the accounting is turned on for a file in the subtree pointed to
315 * to by m, turn accounting off. Done when m is about to die.
316 */
317void acct_auto_close_mnt(struct vfsmount *m)
318{
0b6b030f
PE
319 struct bsd_acct_struct *acct;
320
a75d9797 321 spin_lock(&acct_lock);
b5a71748
PE
322restart:
323 list_for_each_entry(acct, &acct_list, list)
324 if (acct->file && acct->file->f_path.mnt == m) {
325 acct_file_reopen(acct, NULL, NULL);
326 goto restart;
327 }
a75d9797 328 spin_unlock(&acct_lock);
1da177e4
LT
329}
330
417ef531
RD
331/**
332 * acct_auto_close - turn off a filesystem's accounting if it is on
333 * @sb: super block for the filesystem
334 *
335 * If the accounting is turned on for a file in the filesystem pointed
336 * to by sb, turn accounting off.
1da177e4
LT
337 */
338void acct_auto_close(struct super_block *sb)
339{
0b6b030f
PE
340 struct bsd_acct_struct *acct;
341
a75d9797 342 spin_lock(&acct_lock);
b5a71748
PE
343restart:
344 list_for_each_entry(acct, &acct_list, list)
345 if (acct->file && acct->file->f_path.mnt->mnt_sb == sb) {
346 acct_file_reopen(acct, NULL, NULL);
347 goto restart;
348 }
0b6b030f
PE
349 spin_unlock(&acct_lock);
350}
351
352void acct_exit_ns(struct pid_namespace *ns)
353{
354 struct bsd_acct_struct *acct;
355
356 spin_lock(&acct_lock);
357 acct = ns->bacct;
358 if (acct != NULL) {
359 if (acct->file != NULL)
360 acct_file_reopen(acct, NULL, NULL);
361
362 kfree(acct);
1da177e4 363 }
a75d9797 364 spin_unlock(&acct_lock);
1da177e4
LT
365}
366
367/*
368 * encode an unsigned long into a comp_t
369 *
370 * This routine has been adopted from the encode_comp_t() function in
371 * the kern_acct.c file of the FreeBSD operating system. The encoding
372 * is a 13-bit fraction with a 3-bit (base 8) exponent.
373 */
374
375#define MANTSIZE 13 /* 13 bit mantissa. */
376#define EXPSIZE 3 /* Base 8 (3 bit) exponent. */
377#define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */
378
379static comp_t encode_comp_t(unsigned long value)
380{
381 int exp, rnd;
382
383 exp = rnd = 0;
384 while (value > MAXFRACT) {
385 rnd = value & (1 << (EXPSIZE - 1)); /* Round up? */
386 value >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */
387 exp++;
388 }
389
390 /*
6ae965cd
DW
391 * If we need to round up, do it (and handle overflow correctly).
392 */
1da177e4
LT
393 if (rnd && (++value > MAXFRACT)) {
394 value >>= EXPSIZE;
395 exp++;
396 }
397
398 /*
6ae965cd
DW
399 * Clean it up and polish it off.
400 */
1da177e4
LT
401 exp <<= MANTSIZE; /* Shift the exponent into place */
402 exp += value; /* and add on the mantissa. */
403 return exp;
404}
405
406#if ACCT_VERSION==1 || ACCT_VERSION==2
407/*
408 * encode an u64 into a comp2_t (24 bits)
409 *
410 * Format: 5 bit base 2 exponent, 20 bits mantissa.
411 * The leading bit of the mantissa is not stored, but implied for
412 * non-zero exponents.
413 * Largest encodable value is 50 bits.
414 */
415
416#define MANTSIZE2 20 /* 20 bit mantissa. */
417#define EXPSIZE2 5 /* 5 bit base 2 exponent. */
418#define MAXFRACT2 ((1ul << MANTSIZE2) - 1) /* Maximum fractional value. */
419#define MAXEXP2 ((1 <<EXPSIZE2) - 1) /* Maximum exponent. */
420
421static comp2_t encode_comp2_t(u64 value)
422{
6ae965cd
DW
423 int exp, rnd;
424
425 exp = (value > (MAXFRACT2>>1));
426 rnd = 0;
427 while (value > MAXFRACT2) {
428 rnd = value & 1;
429 value >>= 1;
430 exp++;
431 }
432
433 /*
434 * If we need to round up, do it (and handle overflow correctly).
435 */
436 if (rnd && (++value > MAXFRACT2)) {
437 value >>= 1;
438 exp++;
439 }
440
441 if (exp > MAXEXP2) {
442 /* Overflow. Return largest representable number instead. */
443 return (1ul << (MANTSIZE2+EXPSIZE2-1)) - 1;
444 } else {
445 return (value & (MAXFRACT2>>1)) | (exp << (MANTSIZE2-1));
446 }
1da177e4
LT
447}
448#endif
449
450#if ACCT_VERSION==3
451/*
452 * encode an u64 into a 32 bit IEEE float
453 */
454static u32 encode_float(u64 value)
455{
456 unsigned exp = 190;
457 unsigned u;
458
459 if (value==0) return 0;
460 while ((s64)value > 0){
461 value <<= 1;
462 exp--;
463 }
464 u = (u32)(value >> 40) & 0x7fffffu;
465 return u | (exp << 23);
466}
467#endif
468
469/*
470 * Write an accounting entry for an exiting process
471 *
472 * The acct_process() call is the workhorse of the process
473 * accounting system. The struct acct is built here and then written
474 * into the accounting file. This function should only be called from
bcbe4a07 475 * do_exit() or when switching to a different output file.
1da177e4
LT
476 */
477
478/*
479 * do_acct_process does all actual work. Caller holds the reference to file.
480 */
6248b1b3
PE
481static void do_acct_process(struct bsd_acct_struct *acct,
482 struct pid_namespace *ns, struct file *file)
1da177e4 483{
0e464814 484 struct pacct_struct *pacct = &current->signal->pacct;
1da177e4
LT
485 acct_t ac;
486 mm_segment_t fs;
1da177e4
LT
487 unsigned long flim;
488 u64 elapsed;
489 u64 run_time;
490 struct timespec uptime;
24ec839c 491 struct tty_struct *tty;
1da177e4
LT
492
493 /*
494 * First check to see if there is enough free_space to continue
495 * the process accounting system.
496 */
6248b1b3 497 if (!check_free_space(acct, file))
1da177e4
LT
498 return;
499
500 /*
501 * Fill the accounting struct with the needed info as recorded
502 * by the different kernel functions.
503 */
504 memset((caddr_t)&ac, 0, sizeof(acct_t));
505
506 ac.ac_version = ACCT_VERSION | ACCT_BYTEORDER;
507 strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm));
508
509 /* calculate run_time in nsec*/
510 do_posix_clock_monotonic_gettime(&uptime);
511 run_time = (u64)uptime.tv_sec*NSEC_PER_SEC + uptime.tv_nsec;
bb231fe3
KK
512 run_time -= (u64)current->group_leader->start_time.tv_sec * NSEC_PER_SEC
513 + current->group_leader->start_time.tv_nsec;
1da177e4
LT
514 /* convert nsec -> AHZ */
515 elapsed = nsec_to_AHZ(run_time);
516#if ACCT_VERSION==3
517 ac.ac_etime = encode_float(elapsed);
518#else
519 ac.ac_etime = encode_comp_t(elapsed < (unsigned long) -1l ?
520 (unsigned long) elapsed : (unsigned long) -1l);
521#endif
522#if ACCT_VERSION==1 || ACCT_VERSION==2
523 {
524 /* new enlarged etime field */
525 comp2_t etime = encode_comp2_t(elapsed);
526 ac.ac_etime_hi = etime >> 16;
527 ac.ac_etime_lo = (u16) etime;
528 }
529#endif
530 do_div(elapsed, AHZ);
2c6b47de 531 ac.ac_btime = get_seconds() - elapsed;
1da177e4
LT
532 /* we really need to bite the bullet and change layout */
533 ac.ac_uid = current->uid;
534 ac.ac_gid = current->gid;
535#if ACCT_VERSION==2
536 ac.ac_ahz = AHZ;
537#endif
538#if ACCT_VERSION==1 || ACCT_VERSION==2
539 /* backward-compatible 16 bit fields */
540 ac.ac_uid16 = current->uid;
541 ac.ac_gid16 = current->gid;
542#endif
543#if ACCT_VERSION==3
5f7b703f 544 ac.ac_pid = task_tgid_nr_ns(current, ns);
a846a195 545 rcu_read_lock();
5f7b703f 546 ac.ac_ppid = task_tgid_nr_ns(rcu_dereference(current->real_parent), ns);
a846a195 547 rcu_read_unlock();
1da177e4
LT
548#endif
549
a4afee02 550 spin_lock_irq(&current->sighand->siglock);
7bcfa95e
ON
551 tty = current->signal->tty;
552 ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0;
77787bfb
KK
553 ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime)));
554 ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime)));
f6ec29a4 555 ac.ac_flag = pacct->ac_flag;
0e464814 556 ac.ac_mem = encode_comp_t(pacct->ac_mem);
77787bfb
KK
557 ac.ac_minflt = encode_comp_t(pacct->ac_minflt);
558 ac.ac_majflt = encode_comp_t(pacct->ac_majflt);
f6ec29a4 559 ac.ac_exitcode = pacct->ac_exitcode;
a4afee02 560 spin_unlock_irq(&current->sighand->siglock);
1da177e4
LT
561 ac.ac_io = encode_comp_t(0 /* current->io_usage */); /* %% */
562 ac.ac_rw = encode_comp_t(ac.ac_io / 1024);
1da177e4 563 ac.ac_swaps = encode_comp_t(0);
1da177e4
LT
564
565 /*
6ae965cd
DW
566 * Kernel segment override to datasegment and write it
567 * to the accounting file.
568 */
1da177e4
LT
569 fs = get_fs();
570 set_fs(KERNEL_DS);
571 /*
6ae965cd
DW
572 * Accounting records are not subject to resource limits.
573 */
1da177e4
LT
574 flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
575 current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
576 file->f_op->write(file, (char *)&ac,
577 sizeof(acct_t), &file->f_pos);
578 current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim;
579 set_fs(fs);
580}
581
0e464814
KK
582/**
583 * acct_init_pacct - initialize a new pacct_struct
1dbe83c3 584 * @pacct: per-process accounting info struct to initialize
0e464814
KK
585 */
586void acct_init_pacct(struct pacct_struct *pacct)
587{
588 memset(pacct, 0, sizeof(struct pacct_struct));
77787bfb 589 pacct->ac_utime = pacct->ac_stime = cputime_zero;
0e464814
KK
590}
591
592/**
593 * acct_collect - collect accounting information into pacct_struct
f6ec29a4
KK
594 * @exitcode: task exit code
595 * @group_dead: not 0, if this thread is the last one in the process.
0e464814 596 */
f6ec29a4 597void acct_collect(long exitcode, int group_dead)
0e464814
KK
598{
599 struct pacct_struct *pacct = &current->signal->pacct;
600 unsigned long vsize = 0;
601
f6ec29a4 602 if (group_dead && current->mm) {
0e464814
KK
603 struct vm_area_struct *vma;
604 down_read(&current->mm->mmap_sem);
605 vma = current->mm->mmap;
606 while (vma) {
607 vsize += vma->vm_end - vma->vm_start;
608 vma = vma->vm_next;
609 }
610 up_read(&current->mm->mmap_sem);
611 }
612
77787bfb 613 spin_lock_irq(&current->sighand->siglock);
f6ec29a4
KK
614 if (group_dead)
615 pacct->ac_mem = vsize / 1024;
616 if (thread_group_leader(current)) {
617 pacct->ac_exitcode = exitcode;
618 if (current->flags & PF_FORKNOEXEC)
619 pacct->ac_flag |= AFORK;
620 }
621 if (current->flags & PF_SUPERPRIV)
622 pacct->ac_flag |= ASU;
623 if (current->flags & PF_DUMPCORE)
624 pacct->ac_flag |= ACORE;
625 if (current->flags & PF_SIGNALED)
626 pacct->ac_flag |= AXSIG;
77787bfb
KK
627 pacct->ac_utime = cputime_add(pacct->ac_utime, current->utime);
628 pacct->ac_stime = cputime_add(pacct->ac_stime, current->stime);
629 pacct->ac_minflt += current->min_flt;
630 pacct->ac_majflt += current->maj_flt;
631 spin_unlock_irq(&current->sighand->siglock);
0e464814
KK
632}
633
417ef531 634/**
1da177e4 635 * acct_process - now just a wrapper around do_acct_process
417ef531
RD
636 *
637 * handles process accounting for an exiting task
1da177e4 638 */
7f32a25f 639void acct_process(void)
1da177e4
LT
640{
641 struct file *file = NULL;
0b6b030f
PE
642 struct pid_namespace *ns = task_active_pid_ns(current);
643 struct bsd_acct_struct *acct;
1da177e4 644
0b6b030f 645 acct = ns->bacct;
1da177e4
LT
646 /*
647 * accelerate the common fastpath:
648 */
0b6b030f 649 if (!acct || !acct->file)
1da177e4
LT
650 return;
651
a75d9797 652 spin_lock(&acct_lock);
0b6b030f 653 file = acct->file;
1da177e4 654 if (unlikely(!file)) {
a75d9797 655 spin_unlock(&acct_lock);
1da177e4
LT
656 return;
657 }
658 get_file(file);
a75d9797 659 spin_unlock(&acct_lock);
1da177e4 660
0b6b030f 661 do_acct_process(acct, ns, file);
1da177e4
LT
662 fput(file);
663}