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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 | int active; | |
88 | unsigned long needcheck; | |
89 | struct file *file; | |
90 | struct pid_namespace *ns; | |
91 | struct list_head list; | |
92 | }; | |
93 | ||
94 | static DEFINE_SPINLOCK(acct_lock); | |
95 | static LIST_HEAD(acct_list); | |
96 | ||
97 | /* | |
98 | * Check the amount of free space and suspend/resume accordingly. | |
99 | */ | |
100 | static int check_free_space(struct bsd_acct_struct *acct, struct file *file) | |
101 | { | |
102 | struct kstatfs sbuf; | |
103 | int res; | |
104 | int act; | |
105 | u64 resume; | |
106 | u64 suspend; | |
107 | ||
108 | spin_lock(&acct_lock); | |
109 | res = acct->active; | |
110 | if (!file || time_is_before_jiffies(acct->needcheck)) | |
111 | goto out; | |
112 | spin_unlock(&acct_lock); | |
113 | ||
114 | /* May block */ | |
115 | if (vfs_statfs(&file->f_path, &sbuf)) | |
116 | return res; | |
117 | suspend = sbuf.f_blocks * SUSPEND; | |
118 | resume = sbuf.f_blocks * RESUME; | |
119 | ||
120 | do_div(suspend, 100); | |
121 | do_div(resume, 100); | |
122 | ||
123 | if (sbuf.f_bavail <= suspend) | |
124 | act = -1; | |
125 | else if (sbuf.f_bavail >= resume) | |
126 | act = 1; | |
127 | else | |
128 | act = 0; | |
129 | ||
130 | /* | |
131 | * If some joker switched acct->file under us we'ld better be | |
132 | * silent and _not_ touch anything. | |
133 | */ | |
134 | spin_lock(&acct_lock); | |
135 | if (file != acct->file) { | |
136 | if (act) | |
137 | res = act>0; | |
138 | goto out; | |
139 | } | |
140 | ||
141 | if (acct->active) { | |
142 | if (act < 0) { | |
143 | acct->active = 0; | |
144 | printk(KERN_INFO "Process accounting paused\n"); | |
145 | } | |
146 | } else { | |
147 | if (act > 0) { | |
148 | acct->active = 1; | |
149 | printk(KERN_INFO "Process accounting resumed\n"); | |
150 | } | |
151 | } | |
152 | ||
153 | acct->needcheck = jiffies + ACCT_TIMEOUT*HZ; | |
154 | res = acct->active; | |
155 | out: | |
156 | spin_unlock(&acct_lock); | |
157 | return res; | |
158 | } | |
159 | ||
160 | /* | |
161 | * Close the old accounting file (if currently open) and then replace | |
162 | * it with file (if non-NULL). | |
163 | * | |
164 | * NOTE: acct_lock MUST be held on entry and exit. | |
165 | */ | |
166 | static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file, | |
167 | struct pid_namespace *ns) | |
168 | { | |
169 | struct file *old_acct = NULL; | |
170 | struct pid_namespace *old_ns = NULL; | |
171 | ||
172 | if (acct->file) { | |
173 | old_acct = acct->file; | |
174 | old_ns = acct->ns; | |
175 | acct->active = 0; | |
176 | acct->file = NULL; | |
177 | acct->ns = NULL; | |
178 | list_del(&acct->list); | |
179 | } | |
180 | if (file) { | |
181 | acct->file = file; | |
182 | acct->ns = ns; | |
183 | acct->needcheck = jiffies + ACCT_TIMEOUT*HZ; | |
184 | acct->active = 1; | |
185 | list_add(&acct->list, &acct_list); | |
186 | } | |
187 | if (old_acct) { | |
188 | mnt_unpin(old_acct->f_path.mnt); | |
189 | spin_unlock(&acct_lock); | |
190 | do_acct_process(acct, old_ns, old_acct); | |
191 | filp_close(old_acct, NULL); | |
192 | spin_lock(&acct_lock); | |
193 | } | |
194 | } | |
195 | ||
196 | static int acct_on(struct filename *pathname) | |
197 | { | |
198 | struct file *file; | |
199 | struct vfsmount *mnt; | |
200 | struct pid_namespace *ns; | |
201 | struct bsd_acct_struct *acct = NULL; | |
202 | ||
203 | /* Difference from BSD - they don't do O_APPEND */ | |
204 | file = file_open_name(pathname, O_WRONLY|O_APPEND|O_LARGEFILE, 0); | |
205 | if (IS_ERR(file)) | |
206 | return PTR_ERR(file); | |
207 | ||
208 | if (!S_ISREG(file_inode(file)->i_mode)) { | |
209 | filp_close(file, NULL); | |
210 | return -EACCES; | |
211 | } | |
212 | ||
213 | if (!file->f_op->write) { | |
214 | filp_close(file, NULL); | |
215 | return -EIO; | |
216 | } | |
217 | ||
218 | ns = task_active_pid_ns(current); | |
219 | if (ns->bacct == NULL) { | |
220 | acct = kzalloc(sizeof(struct bsd_acct_struct), GFP_KERNEL); | |
221 | if (acct == NULL) { | |
222 | filp_close(file, NULL); | |
223 | return -ENOMEM; | |
224 | } | |
225 | } | |
226 | ||
227 | spin_lock(&acct_lock); | |
228 | if (ns->bacct == NULL) { | |
229 | ns->bacct = acct; | |
230 | acct = NULL; | |
231 | } | |
232 | ||
233 | mnt = file->f_path.mnt; | |
234 | mnt_pin(mnt); | |
235 | acct_file_reopen(ns->bacct, file, ns); | |
236 | spin_unlock(&acct_lock); | |
237 | ||
238 | mntput(mnt); /* it's pinned, now give up active reference */ | |
239 | kfree(acct); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | /** | |
245 | * sys_acct - enable/disable process accounting | |
246 | * @name: file name for accounting records or NULL to shutdown accounting | |
247 | * | |
248 | * Returns 0 for success or negative errno values for failure. | |
249 | * | |
250 | * sys_acct() is the only system call needed to implement process | |
251 | * accounting. It takes the name of the file where accounting records | |
252 | * should be written. If the filename is NULL, accounting will be | |
253 | * shutdown. | |
254 | */ | |
255 | SYSCALL_DEFINE1(acct, const char __user *, name) | |
256 | { | |
257 | int error = 0; | |
258 | ||
259 | if (!capable(CAP_SYS_PACCT)) | |
260 | return -EPERM; | |
261 | ||
262 | if (name) { | |
263 | struct filename *tmp = getname(name); | |
264 | if (IS_ERR(tmp)) | |
265 | return (PTR_ERR(tmp)); | |
266 | error = acct_on(tmp); | |
267 | putname(tmp); | |
268 | } else { | |
269 | struct bsd_acct_struct *acct; | |
270 | ||
271 | acct = task_active_pid_ns(current)->bacct; | |
272 | if (acct == NULL) | |
273 | return 0; | |
274 | ||
275 | spin_lock(&acct_lock); | |
276 | acct_file_reopen(acct, NULL, NULL); | |
277 | spin_unlock(&acct_lock); | |
278 | } | |
279 | ||
280 | return error; | |
281 | } | |
282 | ||
283 | /** | |
284 | * acct_auto_close - turn off a filesystem's accounting if it is on | |
285 | * @m: vfsmount being shut down | |
286 | * | |
287 | * If the accounting is turned on for a file in the subtree pointed to | |
288 | * to by m, turn accounting off. Done when m is about to die. | |
289 | */ | |
290 | void acct_auto_close_mnt(struct vfsmount *m) | |
291 | { | |
292 | struct bsd_acct_struct *acct; | |
293 | ||
294 | spin_lock(&acct_lock); | |
295 | restart: | |
296 | list_for_each_entry(acct, &acct_list, list) | |
297 | if (acct->file && acct->file->f_path.mnt == m) { | |
298 | acct_file_reopen(acct, NULL, NULL); | |
299 | goto restart; | |
300 | } | |
301 | spin_unlock(&acct_lock); | |
302 | } | |
303 | ||
304 | /** | |
305 | * acct_auto_close - turn off a filesystem's accounting if it is on | |
306 | * @sb: super block for the filesystem | |
307 | * | |
308 | * If the accounting is turned on for a file in the filesystem pointed | |
309 | * to by sb, turn accounting off. | |
310 | */ | |
311 | void acct_auto_close(struct super_block *sb) | |
312 | { | |
313 | struct bsd_acct_struct *acct; | |
314 | ||
315 | spin_lock(&acct_lock); | |
316 | restart: | |
317 | list_for_each_entry(acct, &acct_list, list) | |
318 | if (acct->file && acct->file->f_path.dentry->d_sb == sb) { | |
319 | acct_file_reopen(acct, NULL, NULL); | |
320 | goto restart; | |
321 | } | |
322 | spin_unlock(&acct_lock); | |
323 | } | |
324 | ||
325 | void acct_exit_ns(struct pid_namespace *ns) | |
326 | { | |
327 | struct bsd_acct_struct *acct = ns->bacct; | |
328 | ||
329 | if (acct == NULL) | |
330 | return; | |
331 | ||
332 | spin_lock(&acct_lock); | |
333 | if (acct->file != NULL) | |
334 | acct_file_reopen(acct, NULL, NULL); | |
335 | spin_unlock(&acct_lock); | |
336 | ||
337 | kfree(acct); | |
338 | } | |
339 | ||
340 | /* | |
341 | * encode an unsigned long into a comp_t | |
342 | * | |
343 | * This routine has been adopted from the encode_comp_t() function in | |
344 | * the kern_acct.c file of the FreeBSD operating system. The encoding | |
345 | * is a 13-bit fraction with a 3-bit (base 8) exponent. | |
346 | */ | |
347 | ||
348 | #define MANTSIZE 13 /* 13 bit mantissa. */ | |
349 | #define EXPSIZE 3 /* Base 8 (3 bit) exponent. */ | |
350 | #define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */ | |
351 | ||
352 | static comp_t encode_comp_t(unsigned long value) | |
353 | { | |
354 | int exp, rnd; | |
355 | ||
356 | exp = rnd = 0; | |
357 | while (value > MAXFRACT) { | |
358 | rnd = value & (1 << (EXPSIZE - 1)); /* Round up? */ | |
359 | value >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */ | |
360 | exp++; | |
361 | } | |
362 | ||
363 | /* | |
364 | * If we need to round up, do it (and handle overflow correctly). | |
365 | */ | |
366 | if (rnd && (++value > MAXFRACT)) { | |
367 | value >>= EXPSIZE; | |
368 | exp++; | |
369 | } | |
370 | ||
371 | /* | |
372 | * Clean it up and polish it off. | |
373 | */ | |
374 | exp <<= MANTSIZE; /* Shift the exponent into place */ | |
375 | exp += value; /* and add on the mantissa. */ | |
376 | return exp; | |
377 | } | |
378 | ||
379 | #if ACCT_VERSION==1 || ACCT_VERSION==2 | |
380 | /* | |
381 | * encode an u64 into a comp2_t (24 bits) | |
382 | * | |
383 | * Format: 5 bit base 2 exponent, 20 bits mantissa. | |
384 | * The leading bit of the mantissa is not stored, but implied for | |
385 | * non-zero exponents. | |
386 | * Largest encodable value is 50 bits. | |
387 | */ | |
388 | ||
389 | #define MANTSIZE2 20 /* 20 bit mantissa. */ | |
390 | #define EXPSIZE2 5 /* 5 bit base 2 exponent. */ | |
391 | #define MAXFRACT2 ((1ul << MANTSIZE2) - 1) /* Maximum fractional value. */ | |
392 | #define MAXEXP2 ((1 <<EXPSIZE2) - 1) /* Maximum exponent. */ | |
393 | ||
394 | static comp2_t encode_comp2_t(u64 value) | |
395 | { | |
396 | int exp, rnd; | |
397 | ||
398 | exp = (value > (MAXFRACT2>>1)); | |
399 | rnd = 0; | |
400 | while (value > MAXFRACT2) { | |
401 | rnd = value & 1; | |
402 | value >>= 1; | |
403 | exp++; | |
404 | } | |
405 | ||
406 | /* | |
407 | * If we need to round up, do it (and handle overflow correctly). | |
408 | */ | |
409 | if (rnd && (++value > MAXFRACT2)) { | |
410 | value >>= 1; | |
411 | exp++; | |
412 | } | |
413 | ||
414 | if (exp > MAXEXP2) { | |
415 | /* Overflow. Return largest representable number instead. */ | |
416 | return (1ul << (MANTSIZE2+EXPSIZE2-1)) - 1; | |
417 | } else { | |
418 | return (value & (MAXFRACT2>>1)) | (exp << (MANTSIZE2-1)); | |
419 | } | |
420 | } | |
421 | #endif | |
422 | ||
423 | #if ACCT_VERSION==3 | |
424 | /* | |
425 | * encode an u64 into a 32 bit IEEE float | |
426 | */ | |
427 | static u32 encode_float(u64 value) | |
428 | { | |
429 | unsigned exp = 190; | |
430 | unsigned u; | |
431 | ||
432 | if (value==0) return 0; | |
433 | while ((s64)value > 0){ | |
434 | value <<= 1; | |
435 | exp--; | |
436 | } | |
437 | u = (u32)(value >> 40) & 0x7fffffu; | |
438 | return u | (exp << 23); | |
439 | } | |
440 | #endif | |
441 | ||
442 | /* | |
443 | * Write an accounting entry for an exiting process | |
444 | * | |
445 | * The acct_process() call is the workhorse of the process | |
446 | * accounting system. The struct acct is built here and then written | |
447 | * into the accounting file. This function should only be called from | |
448 | * do_exit() or when switching to a different output file. | |
449 | */ | |
450 | ||
451 | /* | |
452 | * do_acct_process does all actual work. Caller holds the reference to file. | |
453 | */ | |
454 | static void do_acct_process(struct bsd_acct_struct *acct, | |
455 | struct pid_namespace *ns, struct file *file) | |
456 | { | |
457 | struct pacct_struct *pacct = ¤t->signal->pacct; | |
458 | acct_t ac; | |
459 | mm_segment_t fs; | |
460 | unsigned long flim; | |
461 | u64 elapsed; | |
462 | u64 run_time; | |
463 | struct timespec uptime; | |
464 | struct tty_struct *tty; | |
465 | const struct cred *orig_cred; | |
466 | ||
467 | /* Perform file operations on behalf of whoever enabled accounting */ | |
468 | orig_cred = override_creds(file->f_cred); | |
469 | ||
470 | /* | |
471 | * First check to see if there is enough free_space to continue | |
472 | * the process accounting system. | |
473 | */ | |
474 | if (!check_free_space(acct, file)) | |
475 | goto out; | |
476 | ||
477 | /* | |
478 | * Fill the accounting struct with the needed info as recorded | |
479 | * by the different kernel functions. | |
480 | */ | |
481 | memset(&ac, 0, sizeof(acct_t)); | |
482 | ||
483 | ac.ac_version = ACCT_VERSION | ACCT_BYTEORDER; | |
484 | strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm)); | |
485 | ||
486 | /* calculate run_time in nsec*/ | |
487 | do_posix_clock_monotonic_gettime(&uptime); | |
488 | run_time = (u64)uptime.tv_sec*NSEC_PER_SEC + uptime.tv_nsec; | |
489 | run_time -= (u64)current->group_leader->start_time.tv_sec * NSEC_PER_SEC | |
490 | + current->group_leader->start_time.tv_nsec; | |
491 | /* convert nsec -> AHZ */ | |
492 | elapsed = nsec_to_AHZ(run_time); | |
493 | #if ACCT_VERSION==3 | |
494 | ac.ac_etime = encode_float(elapsed); | |
495 | #else | |
496 | ac.ac_etime = encode_comp_t(elapsed < (unsigned long) -1l ? | |
497 | (unsigned long) elapsed : (unsigned long) -1l); | |
498 | #endif | |
499 | #if ACCT_VERSION==1 || ACCT_VERSION==2 | |
500 | { | |
501 | /* new enlarged etime field */ | |
502 | comp2_t etime = encode_comp2_t(elapsed); | |
503 | ac.ac_etime_hi = etime >> 16; | |
504 | ac.ac_etime_lo = (u16) etime; | |
505 | } | |
506 | #endif | |
507 | do_div(elapsed, AHZ); | |
508 | ac.ac_btime = get_seconds() - elapsed; | |
509 | /* we really need to bite the bullet and change layout */ | |
510 | ac.ac_uid = from_kuid_munged(file->f_cred->user_ns, orig_cred->uid); | |
511 | ac.ac_gid = from_kgid_munged(file->f_cred->user_ns, orig_cred->gid); | |
512 | #if ACCT_VERSION==2 | |
513 | ac.ac_ahz = AHZ; | |
514 | #endif | |
515 | #if ACCT_VERSION==1 || ACCT_VERSION==2 | |
516 | /* backward-compatible 16 bit fields */ | |
517 | ac.ac_uid16 = ac.ac_uid; | |
518 | ac.ac_gid16 = ac.ac_gid; | |
519 | #endif | |
520 | #if ACCT_VERSION==3 | |
521 | ac.ac_pid = task_tgid_nr_ns(current, ns); | |
522 | rcu_read_lock(); | |
523 | ac.ac_ppid = task_tgid_nr_ns(rcu_dereference(current->real_parent), ns); | |
524 | rcu_read_unlock(); | |
525 | #endif | |
526 | ||
527 | spin_lock_irq(¤t->sighand->siglock); | |
528 | tty = current->signal->tty; /* Safe as we hold the siglock */ | |
529 | ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0; | |
530 | ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime))); | |
531 | ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime))); | |
532 | ac.ac_flag = pacct->ac_flag; | |
533 | ac.ac_mem = encode_comp_t(pacct->ac_mem); | |
534 | ac.ac_minflt = encode_comp_t(pacct->ac_minflt); | |
535 | ac.ac_majflt = encode_comp_t(pacct->ac_majflt); | |
536 | ac.ac_exitcode = pacct->ac_exitcode; | |
537 | spin_unlock_irq(¤t->sighand->siglock); | |
538 | ac.ac_io = encode_comp_t(0 /* current->io_usage */); /* %% */ | |
539 | ac.ac_rw = encode_comp_t(ac.ac_io / 1024); | |
540 | ac.ac_swaps = encode_comp_t(0); | |
541 | ||
542 | /* | |
543 | * Get freeze protection. If the fs is frozen, just skip the write | |
544 | * as we could deadlock the system otherwise. | |
545 | */ | |
546 | if (!file_start_write_trylock(file)) | |
547 | goto out; | |
548 | /* | |
549 | * Kernel segment override to datasegment and write it | |
550 | * to the accounting file. | |
551 | */ | |
552 | fs = get_fs(); | |
553 | set_fs(KERNEL_DS); | |
554 | /* | |
555 | * Accounting records are not subject to resource limits. | |
556 | */ | |
557 | flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; | |
558 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
559 | file->f_op->write(file, (char *)&ac, | |
560 | sizeof(acct_t), &file->f_pos); | |
561 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim; | |
562 | set_fs(fs); | |
563 | file_end_write(file); | |
564 | out: | |
565 | revert_creds(orig_cred); | |
566 | } | |
567 | ||
568 | /** | |
569 | * acct_collect - collect accounting information into pacct_struct | |
570 | * @exitcode: task exit code | |
571 | * @group_dead: not 0, if this thread is the last one in the process. | |
572 | */ | |
573 | void acct_collect(long exitcode, int group_dead) | |
574 | { | |
575 | struct pacct_struct *pacct = ¤t->signal->pacct; | |
576 | cputime_t utime, stime; | |
577 | unsigned long vsize = 0; | |
578 | ||
579 | if (group_dead && current->mm) { | |
580 | struct vm_area_struct *vma; | |
581 | down_read(¤t->mm->mmap_sem); | |
582 | vma = current->mm->mmap; | |
583 | while (vma) { | |
584 | vsize += vma->vm_end - vma->vm_start; | |
585 | vma = vma->vm_next; | |
586 | } | |
587 | up_read(¤t->mm->mmap_sem); | |
588 | } | |
589 | ||
590 | spin_lock_irq(¤t->sighand->siglock); | |
591 | if (group_dead) | |
592 | pacct->ac_mem = vsize / 1024; | |
593 | if (thread_group_leader(current)) { | |
594 | pacct->ac_exitcode = exitcode; | |
595 | if (current->flags & PF_FORKNOEXEC) | |
596 | pacct->ac_flag |= AFORK; | |
597 | } | |
598 | if (current->flags & PF_SUPERPRIV) | |
599 | pacct->ac_flag |= ASU; | |
600 | if (current->flags & PF_DUMPCORE) | |
601 | pacct->ac_flag |= ACORE; | |
602 | if (current->flags & PF_SIGNALED) | |
603 | pacct->ac_flag |= AXSIG; | |
604 | task_cputime(current, &utime, &stime); | |
605 | pacct->ac_utime += utime; | |
606 | pacct->ac_stime += stime; | |
607 | pacct->ac_minflt += current->min_flt; | |
608 | pacct->ac_majflt += current->maj_flt; | |
609 | spin_unlock_irq(¤t->sighand->siglock); | |
610 | } | |
611 | ||
612 | static void acct_process_in_ns(struct pid_namespace *ns) | |
613 | { | |
614 | struct file *file = NULL; | |
615 | struct bsd_acct_struct *acct; | |
616 | ||
617 | acct = ns->bacct; | |
618 | /* | |
619 | * accelerate the common fastpath: | |
620 | */ | |
621 | if (!acct || !acct->file) | |
622 | return; | |
623 | ||
624 | spin_lock(&acct_lock); | |
625 | file = acct->file; | |
626 | if (unlikely(!file)) { | |
627 | spin_unlock(&acct_lock); | |
628 | return; | |
629 | } | |
630 | get_file(file); | |
631 | spin_unlock(&acct_lock); | |
632 | ||
633 | do_acct_process(acct, ns, file); | |
634 | fput(file); | |
635 | } | |
636 | ||
637 | /** | |
638 | * acct_process - now just a wrapper around acct_process_in_ns, | |
639 | * which in turn is a wrapper around do_acct_process. | |
640 | * | |
641 | * handles process accounting for an exiting task | |
642 | */ | |
643 | void acct_process(void) | |
644 | { | |
645 | struct pid_namespace *ns; | |
646 | ||
647 | /* | |
648 | * This loop is safe lockless, since current is still | |
649 | * alive and holds its namespace, which in turn holds | |
650 | * its parent. | |
651 | */ | |
652 | for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent) | |
653 | acct_process_in_ns(ns); | |
654 | } |