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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 | struct pid_namespace *ns; |
220 | struct bsd_acct_struct *acct = NULL; |
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 | |
227 | if (!S_ISREG(file->f_path.dentry->d_inode->i_mode)) { |
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 | |
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 | |
246 | spin_lock(&acct_lock); |
247 | if (ns->bacct == NULL) { |
248 | ns->bacct = acct; |
249 | acct = NULL; |
250 | } |
251 | |
252 | mnt = file->f_path.mnt; |
253 | mnt_pin(mnt); |
254 | acct_file_reopen(ns->bacct, file, ns); |
255 | spin_unlock(&acct_lock); |
256 | |
257 | mntput(mnt); /* it's pinned, now give up active reference */ |
258 | kfree(acct); |
259 | |
260 | return 0; |
261 | } |
262 | |
263 | /** |
264 | * sys_acct - enable/disable process accounting |
265 | * @name: file name for accounting records or NULL to shutdown accounting |
266 | * |
267 | * Returns 0 for success or negative errno values for failure. |
268 | * |
269 | * sys_acct() is the only system call needed to implement process |
270 | * accounting. It takes the name of the file where accounting records |
271 | * should be written. If the filename is NULL, accounting will be |
272 | * shutdown. |
273 | */ |
274 | SYSCALL_DEFINE1(acct, const char __user *, name) |
275 | { |
276 | int error = 0; |
277 | |
278 | if (!capable(CAP_SYS_PACCT)) |
279 | return -EPERM; |
280 | |
281 | if (name) { |
282 | char *tmp = getname(name); |
283 | if (IS_ERR(tmp)) |
284 | return (PTR_ERR(tmp)); |
285 | error = acct_on(tmp); |
286 | putname(tmp); |
287 | } else { |
288 | struct bsd_acct_struct *acct; |
289 | |
290 | acct = task_active_pid_ns(current)->bacct; |
291 | if (acct == NULL) |
292 | return 0; |
293 | |
294 | spin_lock(&acct_lock); |
295 | acct_file_reopen(acct, NULL, NULL); |
296 | spin_unlock(&acct_lock); |
297 | } |
298 | |
299 | return error; |
300 | } |
301 | |
302 | /** |
303 | * acct_auto_close - turn off a filesystem's accounting if it is on |
304 | * @m: vfsmount being shut down |
305 | * |
306 | * If the accounting is turned on for a file in the subtree pointed to |
307 | * to by m, turn accounting off. Done when m is about to die. |
308 | */ |
309 | void acct_auto_close_mnt(struct vfsmount *m) |
310 | { |
311 | struct bsd_acct_struct *acct; |
312 | |
313 | spin_lock(&acct_lock); |
314 | restart: |
315 | list_for_each_entry(acct, &acct_list, list) |
316 | if (acct->file && acct->file->f_path.mnt == m) { |
317 | acct_file_reopen(acct, NULL, NULL); |
318 | goto restart; |
319 | } |
320 | spin_unlock(&acct_lock); |
321 | } |
322 | |
323 | /** |
324 | * acct_auto_close - turn off a filesystem's accounting if it is on |
325 | * @sb: super block for the filesystem |
326 | * |
327 | * If the accounting is turned on for a file in the filesystem pointed |
328 | * to by sb, turn accounting off. |
329 | */ |
330 | void acct_auto_close(struct super_block *sb) |
331 | { |
332 | struct bsd_acct_struct *acct; |
333 | |
334 | spin_lock(&acct_lock); |
335 | restart: |
336 | list_for_each_entry(acct, &acct_list, list) |
337 | if (acct->file && acct->file->f_path.mnt->mnt_sb == sb) { |
338 | acct_file_reopen(acct, NULL, NULL); |
339 | goto restart; |
340 | } |
341 | spin_unlock(&acct_lock); |
342 | } |
343 | |
344 | void acct_exit_ns(struct pid_namespace *ns) |
345 | { |
346 | struct bsd_acct_struct *acct = ns->bacct; |
347 | |
348 | if (acct == NULL) |
349 | return; |
350 | |
351 | del_timer_sync(&acct->timer); |
352 | spin_lock(&acct_lock); |
353 | if (acct->file != NULL) |
354 | acct_file_reopen(acct, NULL, NULL); |
355 | spin_unlock(&acct_lock); |
356 | |
357 | kfree(acct); |
358 | } |
359 | |
360 | /* |
361 | * encode an unsigned long into a comp_t |
362 | * |
363 | * This routine has been adopted from the encode_comp_t() function in |
364 | * the kern_acct.c file of the FreeBSD operating system. The encoding |
365 | * is a 13-bit fraction with a 3-bit (base 8) exponent. |
366 | */ |
367 | |
368 | #define MANTSIZE 13 /* 13 bit mantissa. */ |
369 | #define EXPSIZE 3 /* Base 8 (3 bit) exponent. */ |
370 | #define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */ |
371 | |
372 | static comp_t encode_comp_t(unsigned long value) |
373 | { |
374 | int exp, rnd; |
375 | |
376 | exp = rnd = 0; |
377 | while (value > MAXFRACT) { |
378 | rnd = value & (1 << (EXPSIZE - 1)); /* Round up? */ |
379 | value >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */ |
380 | exp++; |
381 | } |
382 | |
383 | /* |
384 | * If we need to round up, do it (and handle overflow correctly). |
385 | */ |
386 | if (rnd && (++value > MAXFRACT)) { |
387 | value >>= EXPSIZE; |
388 | exp++; |
389 | } |
390 | |
391 | /* |
392 | * Clean it up and polish it off. |
393 | */ |
394 | exp <<= MANTSIZE; /* Shift the exponent into place */ |
395 | exp += value; /* and add on the mantissa. */ |
396 | return exp; |
397 | } |
398 | |
399 | #if ACCT_VERSION==1 || ACCT_VERSION==2 |
400 | /* |
401 | * encode an u64 into a comp2_t (24 bits) |
402 | * |
403 | * Format: 5 bit base 2 exponent, 20 bits mantissa. |
404 | * The leading bit of the mantissa is not stored, but implied for |
405 | * non-zero exponents. |
406 | * Largest encodable value is 50 bits. |
407 | */ |
408 | |
409 | #define MANTSIZE2 20 /* 20 bit mantissa. */ |
410 | #define EXPSIZE2 5 /* 5 bit base 2 exponent. */ |
411 | #define MAXFRACT2 ((1ul << MANTSIZE2) - 1) /* Maximum fractional value. */ |
412 | #define MAXEXP2 ((1 <<EXPSIZE2) - 1) /* Maximum exponent. */ |
413 | |
414 | static comp2_t encode_comp2_t(u64 value) |
415 | { |
416 | int exp, rnd; |
417 | |
418 | exp = (value > (MAXFRACT2>>1)); |
419 | rnd = 0; |
420 | while (value > MAXFRACT2) { |
421 | rnd = value & 1; |
422 | value >>= 1; |
423 | exp++; |
424 | } |
425 | |
426 | /* |
427 | * If we need to round up, do it (and handle overflow correctly). |
428 | */ |
429 | if (rnd && (++value > MAXFRACT2)) { |
430 | value >>= 1; |
431 | exp++; |
432 | } |
433 | |
434 | if (exp > MAXEXP2) { |
435 | /* Overflow. Return largest representable number instead. */ |
436 | return (1ul << (MANTSIZE2+EXPSIZE2-1)) - 1; |
437 | } else { |
438 | return (value & (MAXFRACT2>>1)) | (exp << (MANTSIZE2-1)); |
439 | } |
440 | } |
441 | #endif |
442 | |
443 | #if ACCT_VERSION==3 |
444 | /* |
445 | * encode an u64 into a 32 bit IEEE float |
446 | */ |
447 | static u32 encode_float(u64 value) |
448 | { |
449 | unsigned exp = 190; |
450 | unsigned u; |
451 | |
452 | if (value==0) return 0; |
453 | while ((s64)value > 0){ |
454 | value <<= 1; |
455 | exp--; |
456 | } |
457 | u = (u32)(value >> 40) & 0x7fffffu; |
458 | return u | (exp << 23); |
459 | } |
460 | #endif |
461 | |
462 | /* |
463 | * Write an accounting entry for an exiting process |
464 | * |
465 | * The acct_process() call is the workhorse of the process |
466 | * accounting system. The struct acct is built here and then written |
467 | * into the accounting file. This function should only be called from |
468 | * do_exit() or when switching to a different output file. |
469 | */ |
470 | |
471 | /* |
472 | * do_acct_process does all actual work. Caller holds the reference to file. |
473 | */ |
474 | static void do_acct_process(struct bsd_acct_struct *acct, |
475 | struct pid_namespace *ns, struct file *file) |
476 | { |
477 | struct pacct_struct *pacct = ¤t->signal->pacct; |
478 | acct_t ac; |
479 | mm_segment_t fs; |
480 | unsigned long flim; |
481 | u64 elapsed; |
482 | u64 run_time; |
483 | struct timespec uptime; |
484 | struct tty_struct *tty; |
485 | const struct cred *orig_cred; |
486 | |
487 | /* Perform file operations on behalf of whoever enabled accounting */ |
488 | orig_cred = override_creds(file->f_cred); |
489 | |
490 | /* |
491 | * First check to see if there is enough free_space to continue |
492 | * the process accounting system. |
493 | */ |
494 | if (!check_free_space(acct, file)) |
495 | goto out; |
496 | |
497 | /* |
498 | * Fill the accounting struct with the needed info as recorded |
499 | * by the different kernel functions. |
500 | */ |
501 | memset((caddr_t)&ac, 0, sizeof(acct_t)); |
502 | |
503 | ac.ac_version = ACCT_VERSION | ACCT_BYTEORDER; |
504 | strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm)); |
505 | |
506 | /* calculate run_time in nsec*/ |
507 | do_posix_clock_monotonic_gettime(&uptime); |
508 | run_time = (u64)uptime.tv_sec*NSEC_PER_SEC + uptime.tv_nsec; |
509 | run_time -= (u64)current->group_leader->start_time.tv_sec * NSEC_PER_SEC |
510 | + current->group_leader->start_time.tv_nsec; |
511 | /* convert nsec -> AHZ */ |
512 | elapsed = nsec_to_AHZ(run_time); |
513 | #if ACCT_VERSION==3 |
514 | ac.ac_etime = encode_float(elapsed); |
515 | #else |
516 | ac.ac_etime = encode_comp_t(elapsed < (unsigned long) -1l ? |
517 | (unsigned long) elapsed : (unsigned long) -1l); |
518 | #endif |
519 | #if ACCT_VERSION==1 || ACCT_VERSION==2 |
520 | { |
521 | /* new enlarged etime field */ |
522 | comp2_t etime = encode_comp2_t(elapsed); |
523 | ac.ac_etime_hi = etime >> 16; |
524 | ac.ac_etime_lo = (u16) etime; |
525 | } |
526 | #endif |
527 | do_div(elapsed, AHZ); |
528 | ac.ac_btime = get_seconds() - elapsed; |
529 | /* we really need to bite the bullet and change layout */ |
530 | ac.ac_uid = orig_cred->uid; |
531 | ac.ac_gid = orig_cred->gid; |
532 | #if ACCT_VERSION==2 |
533 | ac.ac_ahz = AHZ; |
534 | #endif |
535 | #if ACCT_VERSION==1 || ACCT_VERSION==2 |
536 | /* backward-compatible 16 bit fields */ |
537 | ac.ac_uid16 = ac.ac_uid; |
538 | ac.ac_gid16 = ac.ac_gid; |
539 | #endif |
540 | #if ACCT_VERSION==3 |
541 | ac.ac_pid = task_tgid_nr_ns(current, ns); |
542 | rcu_read_lock(); |
543 | ac.ac_ppid = task_tgid_nr_ns(rcu_dereference(current->real_parent), ns); |
544 | rcu_read_unlock(); |
545 | #endif |
546 | |
547 | spin_lock_irq(¤t->sighand->siglock); |
548 | tty = current->signal->tty; /* Safe as we hold the siglock */ |
549 | ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0; |
550 | ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime))); |
551 | ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime))); |
552 | ac.ac_flag = pacct->ac_flag; |
553 | ac.ac_mem = encode_comp_t(pacct->ac_mem); |
554 | ac.ac_minflt = encode_comp_t(pacct->ac_minflt); |
555 | ac.ac_majflt = encode_comp_t(pacct->ac_majflt); |
556 | ac.ac_exitcode = pacct->ac_exitcode; |
557 | spin_unlock_irq(¤t->sighand->siglock); |
558 | ac.ac_io = encode_comp_t(0 /* current->io_usage */); /* %% */ |
559 | ac.ac_rw = encode_comp_t(ac.ac_io / 1024); |
560 | ac.ac_swaps = encode_comp_t(0); |
561 | |
562 | /* |
563 | * Kernel segment override to datasegment and write it |
564 | * to the accounting file. |
565 | */ |
566 | fs = get_fs(); |
567 | set_fs(KERNEL_DS); |
568 | /* |
569 | * Accounting records are not subject to resource limits. |
570 | */ |
571 | flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; |
572 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; |
573 | file->f_op->write(file, (char *)&ac, |
574 | sizeof(acct_t), &file->f_pos); |
575 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim; |
576 | set_fs(fs); |
577 | out: |
578 | revert_creds(orig_cred); |
579 | } |
580 | |
581 | /** |
582 | * acct_collect - collect accounting information into pacct_struct |
583 | * @exitcode: task exit code |
584 | * @group_dead: not 0, if this thread is the last one in the process. |
585 | */ |
586 | void acct_collect(long exitcode, int group_dead) |
587 | { |
588 | struct pacct_struct *pacct = ¤t->signal->pacct; |
589 | unsigned long vsize = 0; |
590 | |
591 | if (group_dead && current->mm) { |
592 | struct vm_area_struct *vma; |
593 | down_read(¤t->mm->mmap_sem); |
594 | vma = current->mm->mmap; |
595 | while (vma) { |
596 | vsize += vma->vm_end - vma->vm_start; |
597 | vma = vma->vm_next; |
598 | } |
599 | up_read(¤t->mm->mmap_sem); |
600 | } |
601 | |
602 | spin_lock_irq(¤t->sighand->siglock); |
603 | if (group_dead) |
604 | pacct->ac_mem = vsize / 1024; |
605 | if (thread_group_leader(current)) { |
606 | pacct->ac_exitcode = exitcode; |
607 | if (current->flags & PF_FORKNOEXEC) |
608 | pacct->ac_flag |= AFORK; |
609 | } |
610 | if (current->flags & PF_SUPERPRIV) |
611 | pacct->ac_flag |= ASU; |
612 | if (current->flags & PF_DUMPCORE) |
613 | pacct->ac_flag |= ACORE; |
614 | if (current->flags & PF_SIGNALED) |
615 | pacct->ac_flag |= AXSIG; |
616 | pacct->ac_utime = cputime_add(pacct->ac_utime, current->utime); |
617 | pacct->ac_stime = cputime_add(pacct->ac_stime, current->stime); |
618 | pacct->ac_minflt += current->min_flt; |
619 | pacct->ac_majflt += current->maj_flt; |
620 | spin_unlock_irq(¤t->sighand->siglock); |
621 | } |
622 | |
623 | static void acct_process_in_ns(struct pid_namespace *ns) |
624 | { |
625 | struct file *file = NULL; |
626 | struct bsd_acct_struct *acct; |
627 | |
628 | acct = ns->bacct; |
629 | /* |
630 | * accelerate the common fastpath: |
631 | */ |
632 | if (!acct || !acct->file) |
633 | return; |
634 | |
635 | spin_lock(&acct_lock); |
636 | file = acct->file; |
637 | if (unlikely(!file)) { |
638 | spin_unlock(&acct_lock); |
639 | return; |
640 | } |
641 | get_file(file); |
642 | spin_unlock(&acct_lock); |
643 | |
644 | do_acct_process(acct, ns, file); |
645 | fput(file); |
646 | } |
647 | |
648 | /** |
649 | * acct_process - now just a wrapper around acct_process_in_ns, |
650 | * which in turn is a wrapper around do_acct_process. |
651 | * |
652 | * handles process accounting for an exiting task |
653 | */ |
654 | void acct_process(void) |
655 | { |
656 | struct pid_namespace *ns; |
657 | |
658 | /* |
659 | * This loop is safe lockless, since current is still |
660 | * alive and holds its namespace, which in turn holds |
661 | * its parent. |
662 | */ |
663 | for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent) |
664 | acct_process_in_ns(ns); |
665 | } |
666 |
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javiroman/ks7010
jz-2.6.34
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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