bsdacct: switch from global bsd_acct_struct instance to per-pidns one
[linux-2.6-block.git] / kernel / acct.c
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
LT
91 struct timer_list timer;
92};
93
a75d9797
PE
94static DEFINE_SPINLOCK(acct_lock);
95
1da177e4
LT
96/*
97 * Called whenever the timer says to check the free space.
98 */
e59a04a7 99static void acct_timeout(unsigned long x)
1da177e4 100{
e59a04a7
PE
101 struct bsd_acct_struct *acct = (struct bsd_acct_struct *)x;
102 acct->needcheck = 1;
1da177e4
LT
103}
104
105/*
106 * Check the amount of free space and suspend/resume accordingly.
107 */
6248b1b3 108static int check_free_space(struct bsd_acct_struct *acct, struct file *file)
1da177e4
LT
109{
110 struct kstatfs sbuf;
111 int res;
112 int act;
113 sector_t resume;
114 sector_t suspend;
115
a75d9797 116 spin_lock(&acct_lock);
6248b1b3
PE
117 res = acct->active;
118 if (!file || !acct->needcheck)
1da177e4 119 goto out;
a75d9797 120 spin_unlock(&acct_lock);
1da177e4
LT
121
122 /* May block */
f3a43f3f 123 if (vfs_statfs(file->f_path.dentry, &sbuf))
1da177e4
LT
124 return res;
125 suspend = sbuf.f_blocks * SUSPEND;
126 resume = sbuf.f_blocks * RESUME;
127
128 sector_div(suspend, 100);
129 sector_div(resume, 100);
130
131 if (sbuf.f_bavail <= suspend)
132 act = -1;
133 else if (sbuf.f_bavail >= resume)
134 act = 1;
135 else
136 act = 0;
137
138 /*
6248b1b3 139 * If some joker switched acct->file under us we'ld better be
1da177e4
LT
140 * silent and _not_ touch anything.
141 */
a75d9797 142 spin_lock(&acct_lock);
6248b1b3 143 if (file != acct->file) {
1da177e4
LT
144 if (act)
145 res = act>0;
146 goto out;
147 }
148
6248b1b3 149 if (acct->active) {
1da177e4 150 if (act < 0) {
6248b1b3 151 acct->active = 0;
1da177e4
LT
152 printk(KERN_INFO "Process accounting paused\n");
153 }
154 } else {
155 if (act > 0) {
6248b1b3 156 acct->active = 1;
1da177e4
LT
157 printk(KERN_INFO "Process accounting resumed\n");
158 }
159 }
160
6248b1b3
PE
161 del_timer(&acct->timer);
162 acct->needcheck = 0;
163 acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ;
164 add_timer(&acct->timer);
165 res = acct->active;
1da177e4 166out:
a75d9797 167 spin_unlock(&acct_lock);
1da177e4
LT
168 return res;
169}
170
171/*
417ef531 172 * Close the old accounting file (if currently open) and then replace
1da177e4
LT
173 * it with file (if non-NULL).
174 *
a75d9797 175 * NOTE: acct_lock MUST be held on entry and exit.
1da177e4 176 */
0b6b030f
PE
177static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file,
178 struct pid_namespace *ns)
1da177e4
LT
179{
180 struct file *old_acct = NULL;
5f7b703f 181 struct pid_namespace *old_ns = NULL;
1da177e4 182
6248b1b3
PE
183 if (acct->file) {
184 old_acct = acct->file;
185 old_ns = acct->ns;
186 del_timer(&acct->timer);
187 acct->active = 0;
188 acct->needcheck = 0;
189 acct->file = NULL;
0b6b030f 190 acct->ns = NULL;
1da177e4
LT
191 }
192 if (file) {
6248b1b3 193 acct->file = file;
0b6b030f 194 acct->ns = ns;
6248b1b3
PE
195 acct->needcheck = 0;
196 acct->active = 1;
1da177e4 197 /* It's been deleted if it was used before so this is safe */
6248b1b3
PE
198 setup_timer(&acct->timer, acct_timeout, (unsigned long)acct);
199 acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ;
200 add_timer(&acct->timer);
1da177e4
LT
201 }
202 if (old_acct) {
f3a43f3f 203 mnt_unpin(old_acct->f_path.mnt);
a75d9797 204 spin_unlock(&acct_lock);
6248b1b3 205 do_acct_process(acct, old_ns, old_acct);
1da177e4 206 filp_close(old_acct, NULL);
a75d9797 207 spin_lock(&acct_lock);
1da177e4
LT
208 }
209}
210
7b7b1ace
AV
211static int acct_on(char *name)
212{
213 struct file *file;
214 int error;
0b6b030f
PE
215 struct pid_namespace *ns;
216 struct bsd_acct_struct *acct = NULL;
7b7b1ace
AV
217
218 /* Difference from BSD - they don't do O_APPEND */
219 file = filp_open(name, O_WRONLY|O_APPEND|O_LARGEFILE, 0);
220 if (IS_ERR(file))
221 return PTR_ERR(file);
222
f3a43f3f 223 if (!S_ISREG(file->f_path.dentry->d_inode->i_mode)) {
7b7b1ace
AV
224 filp_close(file, NULL);
225 return -EACCES;
226 }
227
228 if (!file->f_op->write) {
229 filp_close(file, NULL);
230 return -EIO;
231 }
232
0b6b030f
PE
233 ns = task_active_pid_ns(current);
234 if (ns->bacct == NULL) {
235 acct = kzalloc(sizeof(struct bsd_acct_struct), GFP_KERNEL);
236 if (acct == NULL) {
237 filp_close(file, NULL);
238 return -ENOMEM;
239 }
240 }
241
7b7b1ace
AV
242 error = security_acct(file);
243 if (error) {
0b6b030f 244 kfree(acct);
7b7b1ace
AV
245 filp_close(file, NULL);
246 return error;
247 }
248
a75d9797 249 spin_lock(&acct_lock);
0b6b030f
PE
250 if (ns->bacct == NULL) {
251 ns->bacct = acct;
252 acct = NULL;
253 }
254
f3a43f3f 255 mnt_pin(file->f_path.mnt);
0b6b030f 256 acct_file_reopen(ns->bacct, file, ns);
a75d9797 257 spin_unlock(&acct_lock);
7b7b1ace 258
f3a43f3f 259 mntput(file->f_path.mnt); /* it's pinned, now give up active reference */
0b6b030f 260 kfree(acct);
7b7b1ace
AV
261
262 return 0;
263}
264
417ef531
RD
265/**
266 * sys_acct - enable/disable process accounting
267 * @name: file name for accounting records or NULL to shutdown accounting
268 *
269 * Returns 0 for success or negative errno values for failure.
270 *
271 * sys_acct() is the only system call needed to implement process
272 * accounting. It takes the name of the file where accounting records
273 * should be written. If the filename is NULL, accounting will be
274 * shutdown.
1da177e4
LT
275 */
276asmlinkage long sys_acct(const char __user *name)
277{
1da177e4
LT
278 int error;
279
280 if (!capable(CAP_SYS_PACCT))
281 return -EPERM;
282
283 if (name) {
7b7b1ace
AV
284 char *tmp = getname(name);
285 if (IS_ERR(tmp))
1da177e4 286 return (PTR_ERR(tmp));
7b7b1ace 287 error = acct_on(tmp);
1da177e4 288 putname(tmp);
7b7b1ace 289 } else {
0b6b030f
PE
290 struct bsd_acct_struct *acct;
291
292 acct = task_active_pid_ns(current)->bacct;
293 if (acct == NULL)
294 return 0;
295
7b7b1ace
AV
296 error = security_acct(NULL);
297 if (!error) {
a75d9797 298 spin_lock(&acct_lock);
0b6b030f 299 acct_file_reopen(acct, NULL, NULL);
a75d9797 300 spin_unlock(&acct_lock);
1da177e4
LT
301 }
302 }
7b7b1ace
AV
303 return error;
304}
1da177e4 305
7b7b1ace
AV
306/**
307 * acct_auto_close - turn off a filesystem's accounting if it is on
308 * @m: vfsmount being shut down
309 *
310 * If the accounting is turned on for a file in the subtree pointed to
311 * to by m, turn accounting off. Done when m is about to die.
312 */
313void acct_auto_close_mnt(struct vfsmount *m)
314{
0b6b030f
PE
315 struct bsd_acct_struct *acct;
316
317 acct = init_pid_ns.bacct;
318 if (acct == NULL)
319 return;
320
a75d9797 321 spin_lock(&acct_lock);
0b6b030f
PE
322 if (acct->file && acct->file->f_path.mnt == m)
323 acct_file_reopen(acct, NULL, NULL);
a75d9797 324 spin_unlock(&acct_lock);
1da177e4
LT
325}
326
417ef531
RD
327/**
328 * acct_auto_close - turn off a filesystem's accounting if it is on
329 * @sb: super block for the filesystem
330 *
331 * If the accounting is turned on for a file in the filesystem pointed
332 * to by sb, turn accounting off.
1da177e4
LT
333 */
334void acct_auto_close(struct super_block *sb)
335{
0b6b030f
PE
336 struct bsd_acct_struct *acct;
337
338 acct = init_pid_ns.bacct;
339 if (acct == NULL)
340 return;
341
a75d9797 342 spin_lock(&acct_lock);
0b6b030f
PE
343 if (acct->file && acct->file->f_path.mnt->mnt_sb == sb)
344 acct_file_reopen(acct, NULL, NULL);
345 spin_unlock(&acct_lock);
346}
347
348void acct_exit_ns(struct pid_namespace *ns)
349{
350 struct bsd_acct_struct *acct;
351
352 spin_lock(&acct_lock);
353 acct = ns->bacct;
354 if (acct != NULL) {
355 if (acct->file != NULL)
356 acct_file_reopen(acct, NULL, NULL);
357
358 kfree(acct);
1da177e4 359 }
a75d9797 360 spin_unlock(&acct_lock);
1da177e4
LT
361}
362
363/*
364 * encode an unsigned long into a comp_t
365 *
366 * This routine has been adopted from the encode_comp_t() function in
367 * the kern_acct.c file of the FreeBSD operating system. The encoding
368 * is a 13-bit fraction with a 3-bit (base 8) exponent.
369 */
370
371#define MANTSIZE 13 /* 13 bit mantissa. */
372#define EXPSIZE 3 /* Base 8 (3 bit) exponent. */
373#define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */
374
375static comp_t encode_comp_t(unsigned long value)
376{
377 int exp, rnd;
378
379 exp = rnd = 0;
380 while (value > MAXFRACT) {
381 rnd = value & (1 << (EXPSIZE - 1)); /* Round up? */
382 value >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */
383 exp++;
384 }
385
386 /*
6ae965cd
DW
387 * If we need to round up, do it (and handle overflow correctly).
388 */
1da177e4
LT
389 if (rnd && (++value > MAXFRACT)) {
390 value >>= EXPSIZE;
391 exp++;
392 }
393
394 /*
6ae965cd
DW
395 * Clean it up and polish it off.
396 */
1da177e4
LT
397 exp <<= MANTSIZE; /* Shift the exponent into place */
398 exp += value; /* and add on the mantissa. */
399 return exp;
400}
401
402#if ACCT_VERSION==1 || ACCT_VERSION==2
403/*
404 * encode an u64 into a comp2_t (24 bits)
405 *
406 * Format: 5 bit base 2 exponent, 20 bits mantissa.
407 * The leading bit of the mantissa is not stored, but implied for
408 * non-zero exponents.
409 * Largest encodable value is 50 bits.
410 */
411
412#define MANTSIZE2 20 /* 20 bit mantissa. */
413#define EXPSIZE2 5 /* 5 bit base 2 exponent. */
414#define MAXFRACT2 ((1ul << MANTSIZE2) - 1) /* Maximum fractional value. */
415#define MAXEXP2 ((1 <<EXPSIZE2) - 1) /* Maximum exponent. */
416
417static comp2_t encode_comp2_t(u64 value)
418{
6ae965cd
DW
419 int exp, rnd;
420
421 exp = (value > (MAXFRACT2>>1));
422 rnd = 0;
423 while (value > MAXFRACT2) {
424 rnd = value & 1;
425 value >>= 1;
426 exp++;
427 }
428
429 /*
430 * If we need to round up, do it (and handle overflow correctly).
431 */
432 if (rnd && (++value > MAXFRACT2)) {
433 value >>= 1;
434 exp++;
435 }
436
437 if (exp > MAXEXP2) {
438 /* Overflow. Return largest representable number instead. */
439 return (1ul << (MANTSIZE2+EXPSIZE2-1)) - 1;
440 } else {
441 return (value & (MAXFRACT2>>1)) | (exp << (MANTSIZE2-1));
442 }
1da177e4
LT
443}
444#endif
445
446#if ACCT_VERSION==3
447/*
448 * encode an u64 into a 32 bit IEEE float
449 */
450static u32 encode_float(u64 value)
451{
452 unsigned exp = 190;
453 unsigned u;
454
455 if (value==0) return 0;
456 while ((s64)value > 0){
457 value <<= 1;
458 exp--;
459 }
460 u = (u32)(value >> 40) & 0x7fffffu;
461 return u | (exp << 23);
462}
463#endif
464
465/*
466 * Write an accounting entry for an exiting process
467 *
468 * The acct_process() call is the workhorse of the process
469 * accounting system. The struct acct is built here and then written
470 * into the accounting file. This function should only be called from
bcbe4a07 471 * do_exit() or when switching to a different output file.
1da177e4
LT
472 */
473
474/*
475 * do_acct_process does all actual work. Caller holds the reference to file.
476 */
6248b1b3
PE
477static void do_acct_process(struct bsd_acct_struct *acct,
478 struct pid_namespace *ns, struct file *file)
1da177e4 479{
0e464814 480 struct pacct_struct *pacct = &current->signal->pacct;
1da177e4
LT
481 acct_t ac;
482 mm_segment_t fs;
1da177e4
LT
483 unsigned long flim;
484 u64 elapsed;
485 u64 run_time;
486 struct timespec uptime;
24ec839c 487 struct tty_struct *tty;
1da177e4
LT
488
489 /*
490 * First check to see if there is enough free_space to continue
491 * the process accounting system.
492 */
6248b1b3 493 if (!check_free_space(acct, file))
1da177e4
LT
494 return;
495
496 /*
497 * Fill the accounting struct with the needed info as recorded
498 * by the different kernel functions.
499 */
500 memset((caddr_t)&ac, 0, sizeof(acct_t));
501
502 ac.ac_version = ACCT_VERSION | ACCT_BYTEORDER;
503 strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm));
504
505 /* calculate run_time in nsec*/
506 do_posix_clock_monotonic_gettime(&uptime);
507 run_time = (u64)uptime.tv_sec*NSEC_PER_SEC + uptime.tv_nsec;
bb231fe3
KK
508 run_time -= (u64)current->group_leader->start_time.tv_sec * NSEC_PER_SEC
509 + current->group_leader->start_time.tv_nsec;
1da177e4
LT
510 /* convert nsec -> AHZ */
511 elapsed = nsec_to_AHZ(run_time);
512#if ACCT_VERSION==3
513 ac.ac_etime = encode_float(elapsed);
514#else
515 ac.ac_etime = encode_comp_t(elapsed < (unsigned long) -1l ?
516 (unsigned long) elapsed : (unsigned long) -1l);
517#endif
518#if ACCT_VERSION==1 || ACCT_VERSION==2
519 {
520 /* new enlarged etime field */
521 comp2_t etime = encode_comp2_t(elapsed);
522 ac.ac_etime_hi = etime >> 16;
523 ac.ac_etime_lo = (u16) etime;
524 }
525#endif
526 do_div(elapsed, AHZ);
2c6b47de 527 ac.ac_btime = get_seconds() - elapsed;
1da177e4
LT
528 /* we really need to bite the bullet and change layout */
529 ac.ac_uid = current->uid;
530 ac.ac_gid = current->gid;
531#if ACCT_VERSION==2
532 ac.ac_ahz = AHZ;
533#endif
534#if ACCT_VERSION==1 || ACCT_VERSION==2
535 /* backward-compatible 16 bit fields */
536 ac.ac_uid16 = current->uid;
537 ac.ac_gid16 = current->gid;
538#endif
539#if ACCT_VERSION==3
5f7b703f 540 ac.ac_pid = task_tgid_nr_ns(current, ns);
a846a195 541 rcu_read_lock();
5f7b703f 542 ac.ac_ppid = task_tgid_nr_ns(rcu_dereference(current->real_parent), ns);
a846a195 543 rcu_read_unlock();
1da177e4
LT
544#endif
545
a4afee02 546 spin_lock_irq(&current->sighand->siglock);
7bcfa95e
ON
547 tty = current->signal->tty;
548 ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0;
77787bfb
KK
549 ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime)));
550 ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime)));
f6ec29a4 551 ac.ac_flag = pacct->ac_flag;
0e464814 552 ac.ac_mem = encode_comp_t(pacct->ac_mem);
77787bfb
KK
553 ac.ac_minflt = encode_comp_t(pacct->ac_minflt);
554 ac.ac_majflt = encode_comp_t(pacct->ac_majflt);
f6ec29a4 555 ac.ac_exitcode = pacct->ac_exitcode;
a4afee02 556 spin_unlock_irq(&current->sighand->siglock);
1da177e4
LT
557 ac.ac_io = encode_comp_t(0 /* current->io_usage */); /* %% */
558 ac.ac_rw = encode_comp_t(ac.ac_io / 1024);
1da177e4 559 ac.ac_swaps = encode_comp_t(0);
1da177e4
LT
560
561 /*
6ae965cd
DW
562 * Kernel segment override to datasegment and write it
563 * to the accounting file.
564 */
1da177e4
LT
565 fs = get_fs();
566 set_fs(KERNEL_DS);
567 /*
6ae965cd
DW
568 * Accounting records are not subject to resource limits.
569 */
1da177e4
LT
570 flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
571 current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
572 file->f_op->write(file, (char *)&ac,
573 sizeof(acct_t), &file->f_pos);
574 current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim;
575 set_fs(fs);
576}
577
0e464814
KK
578/**
579 * acct_init_pacct - initialize a new pacct_struct
1dbe83c3 580 * @pacct: per-process accounting info struct to initialize
0e464814
KK
581 */
582void acct_init_pacct(struct pacct_struct *pacct)
583{
584 memset(pacct, 0, sizeof(struct pacct_struct));
77787bfb 585 pacct->ac_utime = pacct->ac_stime = cputime_zero;
0e464814
KK
586}
587
588/**
589 * acct_collect - collect accounting information into pacct_struct
f6ec29a4
KK
590 * @exitcode: task exit code
591 * @group_dead: not 0, if this thread is the last one in the process.
0e464814 592 */
f6ec29a4 593void acct_collect(long exitcode, int group_dead)
0e464814
KK
594{
595 struct pacct_struct *pacct = &current->signal->pacct;
596 unsigned long vsize = 0;
597
f6ec29a4 598 if (group_dead && current->mm) {
0e464814
KK
599 struct vm_area_struct *vma;
600 down_read(&current->mm->mmap_sem);
601 vma = current->mm->mmap;
602 while (vma) {
603 vsize += vma->vm_end - vma->vm_start;
604 vma = vma->vm_next;
605 }
606 up_read(&current->mm->mmap_sem);
607 }
608
77787bfb 609 spin_lock_irq(&current->sighand->siglock);
f6ec29a4
KK
610 if (group_dead)
611 pacct->ac_mem = vsize / 1024;
612 if (thread_group_leader(current)) {
613 pacct->ac_exitcode = exitcode;
614 if (current->flags & PF_FORKNOEXEC)
615 pacct->ac_flag |= AFORK;
616 }
617 if (current->flags & PF_SUPERPRIV)
618 pacct->ac_flag |= ASU;
619 if (current->flags & PF_DUMPCORE)
620 pacct->ac_flag |= ACORE;
621 if (current->flags & PF_SIGNALED)
622 pacct->ac_flag |= AXSIG;
77787bfb
KK
623 pacct->ac_utime = cputime_add(pacct->ac_utime, current->utime);
624 pacct->ac_stime = cputime_add(pacct->ac_stime, current->stime);
625 pacct->ac_minflt += current->min_flt;
626 pacct->ac_majflt += current->maj_flt;
627 spin_unlock_irq(&current->sighand->siglock);
0e464814
KK
628}
629
417ef531 630/**
1da177e4 631 * acct_process - now just a wrapper around do_acct_process
417ef531
RD
632 *
633 * handles process accounting for an exiting task
1da177e4 634 */
7f32a25f 635void acct_process(void)
1da177e4
LT
636{
637 struct file *file = NULL;
0b6b030f
PE
638 struct pid_namespace *ns = task_active_pid_ns(current);
639 struct bsd_acct_struct *acct;
1da177e4 640
0b6b030f 641 acct = ns->bacct;
1da177e4
LT
642 /*
643 * accelerate the common fastpath:
644 */
0b6b030f 645 if (!acct || !acct->file)
1da177e4
LT
646 return;
647
a75d9797 648 spin_lock(&acct_lock);
0b6b030f 649 file = acct->file;
1da177e4 650 if (unlikely(!file)) {
a75d9797 651 spin_unlock(&acct_lock);
1da177e4
LT
652 return;
653 }
654 get_file(file);
a75d9797 655 spin_unlock(&acct_lock);
1da177e4 656
0b6b030f 657 do_acct_process(acct, ns, file);
1da177e4
LT
658 fput(file);
659}