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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 | |
46 | #include <linux/mm.h> |
47 | #include <linux/slab.h> |
48 | #include <linux/acct.h> |
49 | #include <linux/capability.h> |
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> |
57 | #include <linux/mount.h> |
58 | #include <asm/uaccess.h> |
59 | #include <asm/div64.h> |
60 | #include <linux/blkdev.h> /* sector_div */ |
61 | #include <linux/pid_namespace.h> |
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 | |
70 | int 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 | */ |
78 | static void do_acct_process(struct bsd_acct_struct *acct, |
79 | struct pid_namespace *ns, struct file *); |
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 | */ |
86 | struct bsd_acct_struct { |
87 | volatile int active; |
88 | volatile int needcheck; |
89 | struct file *file; |
90 | struct pid_namespace *ns; |
91 | struct timer_list timer; |
92 | struct list_head list; |
93 | }; |
94 | |
95 | static DEFINE_SPINLOCK(acct_lock); |
96 | static LIST_HEAD(acct_list); |
97 | |
98 | /* |
99 | * Called whenever the timer says to check the free space. |
100 | */ |
101 | static void acct_timeout(unsigned long x) |
102 | { |
103 | struct bsd_acct_struct *acct = (struct bsd_acct_struct *)x; |
104 | acct->needcheck = 1; |
105 | } |
106 | |
107 | /* |
108 | * Check the amount of free space and suspend/resume accordingly. |
109 | */ |
110 | static int check_free_space(struct bsd_acct_struct *acct, struct file *file) |
111 | { |
112 | struct kstatfs sbuf; |
113 | int res; |
114 | int act; |
115 | sector_t resume; |
116 | sector_t suspend; |
117 | |
118 | spin_lock(&acct_lock); |
119 | res = acct->active; |
120 | if (!file || !acct->needcheck) |
121 | goto out; |
122 | spin_unlock(&acct_lock); |
123 | |
124 | /* May block */ |
125 | if (vfs_statfs(file->f_path.dentry, &sbuf)) |
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 | /* |
141 | * If some joker switched acct->file under us we'ld better be |
142 | * silent and _not_ touch anything. |
143 | */ |
144 | spin_lock(&acct_lock); |
145 | if (file != acct->file) { |
146 | if (act) |
147 | res = act>0; |
148 | goto out; |
149 | } |
150 | |
151 | if (acct->active) { |
152 | if (act < 0) { |
153 | acct->active = 0; |
154 | printk(KERN_INFO "Process accounting paused\n"); |
155 | } |
156 | } else { |
157 | if (act > 0) { |
158 | acct->active = 1; |
159 | printk(KERN_INFO "Process accounting resumed\n"); |
160 | } |
161 | } |
162 | |
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; |
168 | out: |
169 | spin_unlock(&acct_lock); |
170 | return res; |
171 | } |
172 | |
173 | /* |
174 | * Close the old accounting file (if currently open) and then replace |
175 | * it with file (if non-NULL). |
176 | * |
177 | * NOTE: acct_lock MUST be held on entry and exit. |
178 | */ |
179 | static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file, |
180 | struct pid_namespace *ns) |
181 | { |
182 | struct file *old_acct = NULL; |
183 | struct pid_namespace *old_ns = NULL; |
184 | |
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; |
192 | acct->ns = NULL; |
193 | list_del(&acct->list); |
194 | } |
195 | if (file) { |
196 | acct->file = file; |
197 | acct->ns = ns; |
198 | acct->needcheck = 0; |
199 | acct->active = 1; |
200 | list_add(&acct->list, &acct_list); |
201 | /* It's been deleted if it was used before so this is safe */ |
202 | setup_timer(&acct->timer, acct_timeout, (unsigned long)acct); |
203 | acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ; |
204 | add_timer(&acct->timer); |
205 | } |
206 | if (old_acct) { |
207 | mnt_unpin(old_acct->f_path.mnt); |
208 | spin_unlock(&acct_lock); |
209 | do_acct_process(acct, old_ns, old_acct); |
210 | filp_close(old_acct, NULL); |
211 | spin_lock(&acct_lock); |
212 | } |
213 | } |
214 | |
215 | static int acct_on(char *name) |
216 | { |
217 | struct file *file; |
218 | struct vfsmount *mnt; |
219 | int error; |
220 | struct pid_namespace *ns; |
221 | struct bsd_acct_struct *acct = NULL; |
222 | |
223 | /* Difference from BSD - they don't do O_APPEND */ |
224 | file = filp_open(name, O_WRONLY|O_APPEND|O_LARGEFILE, 0); |
225 | if (IS_ERR(file)) |
226 | return PTR_ERR(file); |
227 | |
228 | if (!S_ISREG(file->f_path.dentry->d_inode->i_mode)) { |
229 | filp_close(file, NULL); |
230 | return -EACCES; |
231 | } |
232 | |
233 | if (!file->f_op->write) { |
234 | filp_close(file, NULL); |
235 | return -EIO; |
236 | } |
237 | |
238 | ns = task_active_pid_ns(current); |
239 | if (ns->bacct == NULL) { |
240 | acct = kzalloc(sizeof(struct bsd_acct_struct), GFP_KERNEL); |
241 | if (acct == NULL) { |
242 | filp_close(file, NULL); |
243 | return -ENOMEM; |
244 | } |
245 | } |
246 | |
247 | error = security_acct(file); |
248 | if (error) { |
249 | kfree(acct); |
250 | filp_close(file, NULL); |
251 | return error; |
252 | } |
253 | |
254 | spin_lock(&acct_lock); |
255 | if (ns->bacct == NULL) { |
256 | ns->bacct = acct; |
257 | acct = NULL; |
258 | } |
259 | |
260 | mnt = file->f_path.mnt; |
261 | mnt_pin(mnt); |
262 | acct_file_reopen(ns->bacct, file, ns); |
263 | spin_unlock(&acct_lock); |
264 | |
265 | mntput(mnt); /* it's pinned, now give up active reference */ |
266 | kfree(acct); |
267 | |
268 | return 0; |
269 | } |
270 | |
271 | /** |
272 | * sys_acct - enable/disable process accounting |
273 | * @name: file name for accounting records or NULL to shutdown accounting |
274 | * |
275 | * Returns 0 for success or negative errno values for failure. |
276 | * |
277 | * sys_acct() is the only system call needed to implement process |
278 | * accounting. It takes the name of the file where accounting records |
279 | * should be written. If the filename is NULL, accounting will be |
280 | * shutdown. |
281 | */ |
282 | SYSCALL_DEFINE1(acct, const char __user *, name) |
283 | { |
284 | int error; |
285 | |
286 | if (!capable(CAP_SYS_PACCT)) |
287 | return -EPERM; |
288 | |
289 | if (name) { |
290 | char *tmp = getname(name); |
291 | if (IS_ERR(tmp)) |
292 | return (PTR_ERR(tmp)); |
293 | error = acct_on(tmp); |
294 | putname(tmp); |
295 | } else { |
296 | struct bsd_acct_struct *acct; |
297 | |
298 | acct = task_active_pid_ns(current)->bacct; |
299 | if (acct == NULL) |
300 | return 0; |
301 | |
302 | error = security_acct(NULL); |
303 | if (!error) { |
304 | spin_lock(&acct_lock); |
305 | acct_file_reopen(acct, NULL, NULL); |
306 | spin_unlock(&acct_lock); |
307 | } |
308 | } |
309 | return error; |
310 | } |
311 | |
312 | /** |
313 | * acct_auto_close - turn off a filesystem's accounting if it is on |
314 | * @m: vfsmount being shut down |
315 | * |
316 | * If the accounting is turned on for a file in the subtree pointed to |
317 | * to by m, turn accounting off. Done when m is about to die. |
318 | */ |
319 | void acct_auto_close_mnt(struct vfsmount *m) |
320 | { |
321 | struct bsd_acct_struct *acct; |
322 | |
323 | spin_lock(&acct_lock); |
324 | restart: |
325 | list_for_each_entry(acct, &acct_list, list) |
326 | if (acct->file && acct->file->f_path.mnt == m) { |
327 | acct_file_reopen(acct, NULL, NULL); |
328 | goto restart; |
329 | } |
330 | spin_unlock(&acct_lock); |
331 | } |
332 | |
333 | /** |
334 | * acct_auto_close - turn off a filesystem's accounting if it is on |
335 | * @sb: super block for the filesystem |
336 | * |
337 | * If the accounting is turned on for a file in the filesystem pointed |
338 | * to by sb, turn accounting off. |
339 | */ |
340 | void acct_auto_close(struct super_block *sb) |
341 | { |
342 | struct bsd_acct_struct *acct; |
343 | |
344 | spin_lock(&acct_lock); |
345 | restart: |
346 | list_for_each_entry(acct, &acct_list, list) |
347 | if (acct->file && acct->file->f_path.mnt->mnt_sb == sb) { |
348 | acct_file_reopen(acct, NULL, NULL); |
349 | goto restart; |
350 | } |
351 | spin_unlock(&acct_lock); |
352 | } |
353 | |
354 | void acct_exit_ns(struct pid_namespace *ns) |
355 | { |
356 | struct bsd_acct_struct *acct; |
357 | |
358 | spin_lock(&acct_lock); |
359 | acct = ns->bacct; |
360 | if (acct != NULL) { |
361 | if (acct->file != NULL) |
362 | acct_file_reopen(acct, NULL, NULL); |
363 | |
364 | kfree(acct); |
365 | } |
366 | spin_unlock(&acct_lock); |
367 | } |
368 | |
369 | /* |
370 | * encode an unsigned long into a comp_t |
371 | * |
372 | * This routine has been adopted from the encode_comp_t() function in |
373 | * the kern_acct.c file of the FreeBSD operating system. The encoding |
374 | * is a 13-bit fraction with a 3-bit (base 8) exponent. |
375 | */ |
376 | |
377 | #define MANTSIZE 13 /* 13 bit mantissa. */ |
378 | #define EXPSIZE 3 /* Base 8 (3 bit) exponent. */ |
379 | #define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */ |
380 | |
381 | static comp_t encode_comp_t(unsigned long value) |
382 | { |
383 | int exp, rnd; |
384 | |
385 | exp = rnd = 0; |
386 | while (value > MAXFRACT) { |
387 | rnd = value & (1 << (EXPSIZE - 1)); /* Round up? */ |
388 | value >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */ |
389 | exp++; |
390 | } |
391 | |
392 | /* |
393 | * If we need to round up, do it (and handle overflow correctly). |
394 | */ |
395 | if (rnd && (++value > MAXFRACT)) { |
396 | value >>= EXPSIZE; |
397 | exp++; |
398 | } |
399 | |
400 | /* |
401 | * Clean it up and polish it off. |
402 | */ |
403 | exp <<= MANTSIZE; /* Shift the exponent into place */ |
404 | exp += value; /* and add on the mantissa. */ |
405 | return exp; |
406 | } |
407 | |
408 | #if ACCT_VERSION==1 || ACCT_VERSION==2 |
409 | /* |
410 | * encode an u64 into a comp2_t (24 bits) |
411 | * |
412 | * Format: 5 bit base 2 exponent, 20 bits mantissa. |
413 | * The leading bit of the mantissa is not stored, but implied for |
414 | * non-zero exponents. |
415 | * Largest encodable value is 50 bits. |
416 | */ |
417 | |
418 | #define MANTSIZE2 20 /* 20 bit mantissa. */ |
419 | #define EXPSIZE2 5 /* 5 bit base 2 exponent. */ |
420 | #define MAXFRACT2 ((1ul << MANTSIZE2) - 1) /* Maximum fractional value. */ |
421 | #define MAXEXP2 ((1 <<EXPSIZE2) - 1) /* Maximum exponent. */ |
422 | |
423 | static comp2_t encode_comp2_t(u64 value) |
424 | { |
425 | int exp, rnd; |
426 | |
427 | exp = (value > (MAXFRACT2>>1)); |
428 | rnd = 0; |
429 | while (value > MAXFRACT2) { |
430 | rnd = value & 1; |
431 | value >>= 1; |
432 | exp++; |
433 | } |
434 | |
435 | /* |
436 | * If we need to round up, do it (and handle overflow correctly). |
437 | */ |
438 | if (rnd && (++value > MAXFRACT2)) { |
439 | value >>= 1; |
440 | exp++; |
441 | } |
442 | |
443 | if (exp > MAXEXP2) { |
444 | /* Overflow. Return largest representable number instead. */ |
445 | return (1ul << (MANTSIZE2+EXPSIZE2-1)) - 1; |
446 | } else { |
447 | return (value & (MAXFRACT2>>1)) | (exp << (MANTSIZE2-1)); |
448 | } |
449 | } |
450 | #endif |
451 | |
452 | #if ACCT_VERSION==3 |
453 | /* |
454 | * encode an u64 into a 32 bit IEEE float |
455 | */ |
456 | static u32 encode_float(u64 value) |
457 | { |
458 | unsigned exp = 190; |
459 | unsigned u; |
460 | |
461 | if (value==0) return 0; |
462 | while ((s64)value > 0){ |
463 | value <<= 1; |
464 | exp--; |
465 | } |
466 | u = (u32)(value >> 40) & 0x7fffffu; |
467 | return u | (exp << 23); |
468 | } |
469 | #endif |
470 | |
471 | /* |
472 | * Write an accounting entry for an exiting process |
473 | * |
474 | * The acct_process() call is the workhorse of the process |
475 | * accounting system. The struct acct is built here and then written |
476 | * into the accounting file. This function should only be called from |
477 | * do_exit() or when switching to a different output file. |
478 | */ |
479 | |
480 | /* |
481 | * do_acct_process does all actual work. Caller holds the reference to file. |
482 | */ |
483 | static void do_acct_process(struct bsd_acct_struct *acct, |
484 | struct pid_namespace *ns, struct file *file) |
485 | { |
486 | struct pacct_struct *pacct = ¤t->signal->pacct; |
487 | acct_t ac; |
488 | mm_segment_t fs; |
489 | unsigned long flim; |
490 | u64 elapsed; |
491 | u64 run_time; |
492 | struct timespec uptime; |
493 | struct tty_struct *tty; |
494 | const struct cred *orig_cred; |
495 | |
496 | /* Perform file operations on behalf of whoever enabled accounting */ |
497 | orig_cred = override_creds(file->f_cred); |
498 | |
499 | /* |
500 | * First check to see if there is enough free_space to continue |
501 | * the process accounting system. |
502 | */ |
503 | if (!check_free_space(acct, file)) |
504 | goto out; |
505 | |
506 | /* |
507 | * Fill the accounting struct with the needed info as recorded |
508 | * by the different kernel functions. |
509 | */ |
510 | memset((caddr_t)&ac, 0, sizeof(acct_t)); |
511 | |
512 | ac.ac_version = ACCT_VERSION | ACCT_BYTEORDER; |
513 | strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm)); |
514 | |
515 | /* calculate run_time in nsec*/ |
516 | do_posix_clock_monotonic_gettime(&uptime); |
517 | run_time = (u64)uptime.tv_sec*NSEC_PER_SEC + uptime.tv_nsec; |
518 | run_time -= (u64)current->group_leader->start_time.tv_sec * NSEC_PER_SEC |
519 | + current->group_leader->start_time.tv_nsec; |
520 | /* convert nsec -> AHZ */ |
521 | elapsed = nsec_to_AHZ(run_time); |
522 | #if ACCT_VERSION==3 |
523 | ac.ac_etime = encode_float(elapsed); |
524 | #else |
525 | ac.ac_etime = encode_comp_t(elapsed < (unsigned long) -1l ? |
526 | (unsigned long) elapsed : (unsigned long) -1l); |
527 | #endif |
528 | #if ACCT_VERSION==1 || ACCT_VERSION==2 |
529 | { |
530 | /* new enlarged etime field */ |
531 | comp2_t etime = encode_comp2_t(elapsed); |
532 | ac.ac_etime_hi = etime >> 16; |
533 | ac.ac_etime_lo = (u16) etime; |
534 | } |
535 | #endif |
536 | do_div(elapsed, AHZ); |
537 | ac.ac_btime = get_seconds() - elapsed; |
538 | /* we really need to bite the bullet and change layout */ |
539 | ac.ac_uid = orig_cred->uid; |
540 | ac.ac_gid = orig_cred->gid; |
541 | #if ACCT_VERSION==2 |
542 | ac.ac_ahz = AHZ; |
543 | #endif |
544 | #if ACCT_VERSION==1 || ACCT_VERSION==2 |
545 | /* backward-compatible 16 bit fields */ |
546 | ac.ac_uid16 = ac.ac_uid; |
547 | ac.ac_gid16 = ac.ac_gid; |
548 | #endif |
549 | #if ACCT_VERSION==3 |
550 | ac.ac_pid = task_tgid_nr_ns(current, ns); |
551 | rcu_read_lock(); |
552 | ac.ac_ppid = task_tgid_nr_ns(rcu_dereference(current->real_parent), ns); |
553 | rcu_read_unlock(); |
554 | #endif |
555 | |
556 | spin_lock_irq(¤t->sighand->siglock); |
557 | tty = current->signal->tty; /* Safe as we hold the siglock */ |
558 | ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0; |
559 | ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime))); |
560 | ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime))); |
561 | ac.ac_flag = pacct->ac_flag; |
562 | ac.ac_mem = encode_comp_t(pacct->ac_mem); |
563 | ac.ac_minflt = encode_comp_t(pacct->ac_minflt); |
564 | ac.ac_majflt = encode_comp_t(pacct->ac_majflt); |
565 | ac.ac_exitcode = pacct->ac_exitcode; |
566 | spin_unlock_irq(¤t->sighand->siglock); |
567 | ac.ac_io = encode_comp_t(0 /* current->io_usage */); /* %% */ |
568 | ac.ac_rw = encode_comp_t(ac.ac_io / 1024); |
569 | ac.ac_swaps = encode_comp_t(0); |
570 | |
571 | /* |
572 | * Kernel segment override to datasegment and write it |
573 | * to the accounting file. |
574 | */ |
575 | fs = get_fs(); |
576 | set_fs(KERNEL_DS); |
577 | /* |
578 | * Accounting records are not subject to resource limits. |
579 | */ |
580 | flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; |
581 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; |
582 | file->f_op->write(file, (char *)&ac, |
583 | sizeof(acct_t), &file->f_pos); |
584 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim; |
585 | set_fs(fs); |
586 | out: |
587 | revert_creds(orig_cred); |
588 | } |
589 | |
590 | /** |
591 | * acct_collect - collect accounting information into pacct_struct |
592 | * @exitcode: task exit code |
593 | * @group_dead: not 0, if this thread is the last one in the process. |
594 | */ |
595 | void acct_collect(long exitcode, int group_dead) |
596 | { |
597 | struct pacct_struct *pacct = ¤t->signal->pacct; |
598 | unsigned long vsize = 0; |
599 | |
600 | if (group_dead && current->mm) { |
601 | struct vm_area_struct *vma; |
602 | down_read(¤t->mm->mmap_sem); |
603 | vma = current->mm->mmap; |
604 | while (vma) { |
605 | vsize += vma->vm_end - vma->vm_start; |
606 | vma = vma->vm_next; |
607 | } |
608 | up_read(¤t->mm->mmap_sem); |
609 | } |
610 | |
611 | spin_lock_irq(¤t->sighand->siglock); |
612 | if (group_dead) |
613 | pacct->ac_mem = vsize / 1024; |
614 | if (thread_group_leader(current)) { |
615 | pacct->ac_exitcode = exitcode; |
616 | if (current->flags & PF_FORKNOEXEC) |
617 | pacct->ac_flag |= AFORK; |
618 | } |
619 | if (current->flags & PF_SUPERPRIV) |
620 | pacct->ac_flag |= ASU; |
621 | if (current->flags & PF_DUMPCORE) |
622 | pacct->ac_flag |= ACORE; |
623 | if (current->flags & PF_SIGNALED) |
624 | pacct->ac_flag |= AXSIG; |
625 | pacct->ac_utime = cputime_add(pacct->ac_utime, current->utime); |
626 | pacct->ac_stime = cputime_add(pacct->ac_stime, current->stime); |
627 | pacct->ac_minflt += current->min_flt; |
628 | pacct->ac_majflt += current->maj_flt; |
629 | spin_unlock_irq(¤t->sighand->siglock); |
630 | } |
631 | |
632 | static void acct_process_in_ns(struct pid_namespace *ns) |
633 | { |
634 | struct file *file = NULL; |
635 | struct bsd_acct_struct *acct; |
636 | |
637 | acct = ns->bacct; |
638 | /* |
639 | * accelerate the common fastpath: |
640 | */ |
641 | if (!acct || !acct->file) |
642 | return; |
643 | |
644 | spin_lock(&acct_lock); |
645 | file = acct->file; |
646 | if (unlikely(!file)) { |
647 | spin_unlock(&acct_lock); |
648 | return; |
649 | } |
650 | get_file(file); |
651 | spin_unlock(&acct_lock); |
652 | |
653 | do_acct_process(acct, ns, file); |
654 | fput(file); |
655 | } |
656 | |
657 | /** |
658 | * acct_process - now just a wrapper around acct_process_in_ns, |
659 | * which in turn is a wrapper around do_acct_process. |
660 | * |
661 | * handles process accounting for an exiting task |
662 | */ |
663 | void acct_process(void) |
664 | { |
665 | struct pid_namespace *ns; |
666 | |
667 | /* |
668 | * This loop is safe lockless, since current is still |
669 | * alive and holds its namespace, which in turn holds |
670 | * its parent. |
671 | */ |
672 | for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent) |
673 | acct_process_in_ns(ns); |
674 | } |
675 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9