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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 | ||
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 | */ | |
5f7b703f | 78 | static void do_acct_process(struct pid_namespace *ns, struct file *); |
1da177e4 LT |
79 | |
80 | /* | |
81 | * This structure is used so that all the data protected by lock | |
82 | * can be placed in the same cache line as the lock. This primes | |
83 | * the cache line to have the data after getting the lock. | |
84 | */ | |
081e4c8a | 85 | struct bsd_acct_struct { |
1da177e4 LT |
86 | spinlock_t lock; |
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 | ||
081e4c8a | 94 | static struct bsd_acct_struct acct_globals __cacheline_aligned = |
6cfd76a2 | 95 | {__SPIN_LOCK_UNLOCKED(acct_globals.lock)}; |
1da177e4 LT |
96 | |
97 | /* | |
98 | * Called whenever the timer says to check the free space. | |
99 | */ | |
e59a04a7 | 100 | static void acct_timeout(unsigned long x) |
1da177e4 | 101 | { |
e59a04a7 PE |
102 | struct bsd_acct_struct *acct = (struct bsd_acct_struct *)x; |
103 | acct->needcheck = 1; | |
1da177e4 LT |
104 | } |
105 | ||
106 | /* | |
107 | * Check the amount of free space and suspend/resume accordingly. | |
108 | */ | |
109 | static int check_free_space(struct file *file) | |
110 | { | |
111 | struct kstatfs sbuf; | |
112 | int res; | |
113 | int act; | |
114 | sector_t resume; | |
115 | sector_t suspend; | |
116 | ||
117 | spin_lock(&acct_globals.lock); | |
118 | res = acct_globals.active; | |
119 | if (!file || !acct_globals.needcheck) | |
120 | goto out; | |
121 | spin_unlock(&acct_globals.lock); | |
122 | ||
123 | /* May block */ | |
f3a43f3f | 124 | if (vfs_statfs(file->f_path.dentry, &sbuf)) |
1da177e4 LT |
125 | return res; |
126 | suspend = sbuf.f_blocks * SUSPEND; | |
127 | resume = sbuf.f_blocks * RESUME; | |
128 | ||
129 | sector_div(suspend, 100); | |
130 | sector_div(resume, 100); | |
131 | ||
132 | if (sbuf.f_bavail <= suspend) | |
133 | act = -1; | |
134 | else if (sbuf.f_bavail >= resume) | |
135 | act = 1; | |
136 | else | |
137 | act = 0; | |
138 | ||
139 | /* | |
140 | * If some joker switched acct_globals.file under us we'ld better be | |
141 | * silent and _not_ touch anything. | |
142 | */ | |
143 | spin_lock(&acct_globals.lock); | |
144 | if (file != acct_globals.file) { | |
145 | if (act) | |
146 | res = act>0; | |
147 | goto out; | |
148 | } | |
149 | ||
150 | if (acct_globals.active) { | |
151 | if (act < 0) { | |
152 | acct_globals.active = 0; | |
153 | printk(KERN_INFO "Process accounting paused\n"); | |
154 | } | |
155 | } else { | |
156 | if (act > 0) { | |
157 | acct_globals.active = 1; | |
158 | printk(KERN_INFO "Process accounting resumed\n"); | |
159 | } | |
160 | } | |
161 | ||
162 | del_timer(&acct_globals.timer); | |
163 | acct_globals.needcheck = 0; | |
164 | acct_globals.timer.expires = jiffies + ACCT_TIMEOUT*HZ; | |
165 | add_timer(&acct_globals.timer); | |
166 | res = acct_globals.active; | |
167 | out: | |
168 | spin_unlock(&acct_globals.lock); | |
169 | return res; | |
170 | } | |
171 | ||
172 | /* | |
417ef531 | 173 | * Close the old accounting file (if currently open) and then replace |
1da177e4 LT |
174 | * it with file (if non-NULL). |
175 | * | |
176 | * NOTE: acct_globals.lock MUST be held on entry and exit. | |
177 | */ | |
178 | static void acct_file_reopen(struct file *file) | |
179 | { | |
180 | struct file *old_acct = NULL; | |
5f7b703f | 181 | struct pid_namespace *old_ns = NULL; |
1da177e4 LT |
182 | |
183 | if (acct_globals.file) { | |
184 | old_acct = acct_globals.file; | |
5f7b703f | 185 | old_ns = acct_globals.ns; |
1da177e4 LT |
186 | del_timer(&acct_globals.timer); |
187 | acct_globals.active = 0; | |
188 | acct_globals.needcheck = 0; | |
189 | acct_globals.file = NULL; | |
190 | } | |
191 | if (file) { | |
192 | acct_globals.file = file; | |
5f7b703f | 193 | acct_globals.ns = get_pid_ns(task_active_pid_ns(current)); |
1da177e4 LT |
194 | acct_globals.needcheck = 0; |
195 | acct_globals.active = 1; | |
196 | /* It's been deleted if it was used before so this is safe */ | |
e59a04a7 PE |
197 | setup_timer(&acct_globals.timer, acct_timeout, |
198 | (unsigned long)&acct_globals); | |
1da177e4 LT |
199 | acct_globals.timer.expires = jiffies + ACCT_TIMEOUT*HZ; |
200 | add_timer(&acct_globals.timer); | |
201 | } | |
202 | if (old_acct) { | |
f3a43f3f | 203 | mnt_unpin(old_acct->f_path.mnt); |
1da177e4 | 204 | spin_unlock(&acct_globals.lock); |
5f7b703f | 205 | do_acct_process(old_ns, old_acct); |
1da177e4 | 206 | filp_close(old_acct, NULL); |
5f7b703f | 207 | put_pid_ns(old_ns); |
1da177e4 LT |
208 | spin_lock(&acct_globals.lock); |
209 | } | |
210 | } | |
211 | ||
7b7b1ace AV |
212 | static int acct_on(char *name) |
213 | { | |
214 | struct file *file; | |
215 | int error; | |
216 | ||
217 | /* Difference from BSD - they don't do O_APPEND */ | |
218 | file = filp_open(name, O_WRONLY|O_APPEND|O_LARGEFILE, 0); | |
219 | if (IS_ERR(file)) | |
220 | return PTR_ERR(file); | |
221 | ||
f3a43f3f | 222 | if (!S_ISREG(file->f_path.dentry->d_inode->i_mode)) { |
7b7b1ace AV |
223 | filp_close(file, NULL); |
224 | return -EACCES; | |
225 | } | |
226 | ||
227 | if (!file->f_op->write) { | |
228 | filp_close(file, NULL); | |
229 | return -EIO; | |
230 | } | |
231 | ||
232 | error = security_acct(file); | |
233 | if (error) { | |
234 | filp_close(file, NULL); | |
235 | return error; | |
236 | } | |
237 | ||
238 | spin_lock(&acct_globals.lock); | |
f3a43f3f | 239 | mnt_pin(file->f_path.mnt); |
7b7b1ace AV |
240 | acct_file_reopen(file); |
241 | spin_unlock(&acct_globals.lock); | |
242 | ||
f3a43f3f | 243 | mntput(file->f_path.mnt); /* it's pinned, now give up active reference */ |
7b7b1ace AV |
244 | |
245 | return 0; | |
246 | } | |
247 | ||
417ef531 RD |
248 | /** |
249 | * sys_acct - enable/disable process accounting | |
250 | * @name: file name for accounting records or NULL to shutdown accounting | |
251 | * | |
252 | * Returns 0 for success or negative errno values for failure. | |
253 | * | |
254 | * sys_acct() is the only system call needed to implement process | |
255 | * accounting. It takes the name of the file where accounting records | |
256 | * should be written. If the filename is NULL, accounting will be | |
257 | * shutdown. | |
1da177e4 LT |
258 | */ |
259 | asmlinkage long sys_acct(const char __user *name) | |
260 | { | |
1da177e4 LT |
261 | int error; |
262 | ||
263 | if (!capable(CAP_SYS_PACCT)) | |
264 | return -EPERM; | |
265 | ||
266 | if (name) { | |
7b7b1ace AV |
267 | char *tmp = getname(name); |
268 | if (IS_ERR(tmp)) | |
1da177e4 | 269 | return (PTR_ERR(tmp)); |
7b7b1ace | 270 | error = acct_on(tmp); |
1da177e4 | 271 | putname(tmp); |
7b7b1ace AV |
272 | } else { |
273 | error = security_acct(NULL); | |
274 | if (!error) { | |
275 | spin_lock(&acct_globals.lock); | |
276 | acct_file_reopen(NULL); | |
277 | spin_unlock(&acct_globals.lock); | |
1da177e4 LT |
278 | } |
279 | } | |
7b7b1ace AV |
280 | return error; |
281 | } | |
1da177e4 | 282 | |
7b7b1ace AV |
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 | { | |
1da177e4 | 292 | spin_lock(&acct_globals.lock); |
f3a43f3f | 293 | if (acct_globals.file && acct_globals.file->f_path.mnt == m) |
7b7b1ace | 294 | acct_file_reopen(NULL); |
1da177e4 | 295 | spin_unlock(&acct_globals.lock); |
1da177e4 LT |
296 | } |
297 | ||
417ef531 RD |
298 | /** |
299 | * acct_auto_close - turn off a filesystem's accounting if it is on | |
300 | * @sb: super block for the filesystem | |
301 | * | |
302 | * If the accounting is turned on for a file in the filesystem pointed | |
303 | * to by sb, turn accounting off. | |
1da177e4 LT |
304 | */ |
305 | void acct_auto_close(struct super_block *sb) | |
306 | { | |
307 | spin_lock(&acct_globals.lock); | |
308 | if (acct_globals.file && | |
f3a43f3f | 309 | acct_globals.file->f_path.mnt->mnt_sb == sb) { |
7b7b1ace | 310 | acct_file_reopen(NULL); |
1da177e4 LT |
311 | } |
312 | spin_unlock(&acct_globals.lock); | |
313 | } | |
314 | ||
315 | /* | |
316 | * encode an unsigned long into a comp_t | |
317 | * | |
318 | * This routine has been adopted from the encode_comp_t() function in | |
319 | * the kern_acct.c file of the FreeBSD operating system. The encoding | |
320 | * is a 13-bit fraction with a 3-bit (base 8) exponent. | |
321 | */ | |
322 | ||
323 | #define MANTSIZE 13 /* 13 bit mantissa. */ | |
324 | #define EXPSIZE 3 /* Base 8 (3 bit) exponent. */ | |
325 | #define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */ | |
326 | ||
327 | static comp_t encode_comp_t(unsigned long value) | |
328 | { | |
329 | int exp, rnd; | |
330 | ||
331 | exp = rnd = 0; | |
332 | while (value > MAXFRACT) { | |
333 | rnd = value & (1 << (EXPSIZE - 1)); /* Round up? */ | |
334 | value >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */ | |
335 | exp++; | |
336 | } | |
337 | ||
338 | /* | |
6ae965cd DW |
339 | * If we need to round up, do it (and handle overflow correctly). |
340 | */ | |
1da177e4 LT |
341 | if (rnd && (++value > MAXFRACT)) { |
342 | value >>= EXPSIZE; | |
343 | exp++; | |
344 | } | |
345 | ||
346 | /* | |
6ae965cd DW |
347 | * Clean it up and polish it off. |
348 | */ | |
1da177e4 LT |
349 | exp <<= MANTSIZE; /* Shift the exponent into place */ |
350 | exp += value; /* and add on the mantissa. */ | |
351 | return exp; | |
352 | } | |
353 | ||
354 | #if ACCT_VERSION==1 || ACCT_VERSION==2 | |
355 | /* | |
356 | * encode an u64 into a comp2_t (24 bits) | |
357 | * | |
358 | * Format: 5 bit base 2 exponent, 20 bits mantissa. | |
359 | * The leading bit of the mantissa is not stored, but implied for | |
360 | * non-zero exponents. | |
361 | * Largest encodable value is 50 bits. | |
362 | */ | |
363 | ||
364 | #define MANTSIZE2 20 /* 20 bit mantissa. */ | |
365 | #define EXPSIZE2 5 /* 5 bit base 2 exponent. */ | |
366 | #define MAXFRACT2 ((1ul << MANTSIZE2) - 1) /* Maximum fractional value. */ | |
367 | #define MAXEXP2 ((1 <<EXPSIZE2) - 1) /* Maximum exponent. */ | |
368 | ||
369 | static comp2_t encode_comp2_t(u64 value) | |
370 | { | |
6ae965cd DW |
371 | int exp, rnd; |
372 | ||
373 | exp = (value > (MAXFRACT2>>1)); | |
374 | rnd = 0; | |
375 | while (value > MAXFRACT2) { | |
376 | rnd = value & 1; | |
377 | value >>= 1; | |
378 | exp++; | |
379 | } | |
380 | ||
381 | /* | |
382 | * If we need to round up, do it (and handle overflow correctly). | |
383 | */ | |
384 | if (rnd && (++value > MAXFRACT2)) { | |
385 | value >>= 1; | |
386 | exp++; | |
387 | } | |
388 | ||
389 | if (exp > MAXEXP2) { | |
390 | /* Overflow. Return largest representable number instead. */ | |
391 | return (1ul << (MANTSIZE2+EXPSIZE2-1)) - 1; | |
392 | } else { | |
393 | return (value & (MAXFRACT2>>1)) | (exp << (MANTSIZE2-1)); | |
394 | } | |
1da177e4 LT |
395 | } |
396 | #endif | |
397 | ||
398 | #if ACCT_VERSION==3 | |
399 | /* | |
400 | * encode an u64 into a 32 bit IEEE float | |
401 | */ | |
402 | static u32 encode_float(u64 value) | |
403 | { | |
404 | unsigned exp = 190; | |
405 | unsigned u; | |
406 | ||
407 | if (value==0) return 0; | |
408 | while ((s64)value > 0){ | |
409 | value <<= 1; | |
410 | exp--; | |
411 | } | |
412 | u = (u32)(value >> 40) & 0x7fffffu; | |
413 | return u | (exp << 23); | |
414 | } | |
415 | #endif | |
416 | ||
417 | /* | |
418 | * Write an accounting entry for an exiting process | |
419 | * | |
420 | * The acct_process() call is the workhorse of the process | |
421 | * accounting system. The struct acct is built here and then written | |
422 | * into the accounting file. This function should only be called from | |
bcbe4a07 | 423 | * do_exit() or when switching to a different output file. |
1da177e4 LT |
424 | */ |
425 | ||
426 | /* | |
427 | * do_acct_process does all actual work. Caller holds the reference to file. | |
428 | */ | |
5f7b703f | 429 | static void do_acct_process(struct pid_namespace *ns, struct file *file) |
1da177e4 | 430 | { |
0e464814 | 431 | struct pacct_struct *pacct = ¤t->signal->pacct; |
1da177e4 LT |
432 | acct_t ac; |
433 | mm_segment_t fs; | |
1da177e4 LT |
434 | unsigned long flim; |
435 | u64 elapsed; | |
436 | u64 run_time; | |
437 | struct timespec uptime; | |
24ec839c | 438 | struct tty_struct *tty; |
1da177e4 LT |
439 | |
440 | /* | |
441 | * First check to see if there is enough free_space to continue | |
442 | * the process accounting system. | |
443 | */ | |
444 | if (!check_free_space(file)) | |
445 | return; | |
446 | ||
447 | /* | |
448 | * Fill the accounting struct with the needed info as recorded | |
449 | * by the different kernel functions. | |
450 | */ | |
451 | memset((caddr_t)&ac, 0, sizeof(acct_t)); | |
452 | ||
453 | ac.ac_version = ACCT_VERSION | ACCT_BYTEORDER; | |
454 | strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm)); | |
455 | ||
456 | /* calculate run_time in nsec*/ | |
457 | do_posix_clock_monotonic_gettime(&uptime); | |
458 | run_time = (u64)uptime.tv_sec*NSEC_PER_SEC + uptime.tv_nsec; | |
bb231fe3 KK |
459 | run_time -= (u64)current->group_leader->start_time.tv_sec * NSEC_PER_SEC |
460 | + current->group_leader->start_time.tv_nsec; | |
1da177e4 LT |
461 | /* convert nsec -> AHZ */ |
462 | elapsed = nsec_to_AHZ(run_time); | |
463 | #if ACCT_VERSION==3 | |
464 | ac.ac_etime = encode_float(elapsed); | |
465 | #else | |
466 | ac.ac_etime = encode_comp_t(elapsed < (unsigned long) -1l ? | |
467 | (unsigned long) elapsed : (unsigned long) -1l); | |
468 | #endif | |
469 | #if ACCT_VERSION==1 || ACCT_VERSION==2 | |
470 | { | |
471 | /* new enlarged etime field */ | |
472 | comp2_t etime = encode_comp2_t(elapsed); | |
473 | ac.ac_etime_hi = etime >> 16; | |
474 | ac.ac_etime_lo = (u16) etime; | |
475 | } | |
476 | #endif | |
477 | do_div(elapsed, AHZ); | |
2c6b47de | 478 | ac.ac_btime = get_seconds() - elapsed; |
1da177e4 LT |
479 | /* we really need to bite the bullet and change layout */ |
480 | ac.ac_uid = current->uid; | |
481 | ac.ac_gid = current->gid; | |
482 | #if ACCT_VERSION==2 | |
483 | ac.ac_ahz = AHZ; | |
484 | #endif | |
485 | #if ACCT_VERSION==1 || ACCT_VERSION==2 | |
486 | /* backward-compatible 16 bit fields */ | |
487 | ac.ac_uid16 = current->uid; | |
488 | ac.ac_gid16 = current->gid; | |
489 | #endif | |
490 | #if ACCT_VERSION==3 | |
5f7b703f | 491 | ac.ac_pid = task_tgid_nr_ns(current, ns); |
a846a195 | 492 | rcu_read_lock(); |
5f7b703f | 493 | ac.ac_ppid = task_tgid_nr_ns(rcu_dereference(current->real_parent), ns); |
a846a195 | 494 | rcu_read_unlock(); |
1da177e4 LT |
495 | #endif |
496 | ||
a4afee02 | 497 | spin_lock_irq(¤t->sighand->siglock); |
7bcfa95e ON |
498 | tty = current->signal->tty; |
499 | ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0; | |
77787bfb KK |
500 | ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime))); |
501 | ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime))); | |
f6ec29a4 | 502 | ac.ac_flag = pacct->ac_flag; |
0e464814 | 503 | ac.ac_mem = encode_comp_t(pacct->ac_mem); |
77787bfb KK |
504 | ac.ac_minflt = encode_comp_t(pacct->ac_minflt); |
505 | ac.ac_majflt = encode_comp_t(pacct->ac_majflt); | |
f6ec29a4 | 506 | ac.ac_exitcode = pacct->ac_exitcode; |
a4afee02 | 507 | spin_unlock_irq(¤t->sighand->siglock); |
1da177e4 LT |
508 | ac.ac_io = encode_comp_t(0 /* current->io_usage */); /* %% */ |
509 | ac.ac_rw = encode_comp_t(ac.ac_io / 1024); | |
1da177e4 | 510 | ac.ac_swaps = encode_comp_t(0); |
1da177e4 LT |
511 | |
512 | /* | |
6ae965cd DW |
513 | * Kernel segment override to datasegment and write it |
514 | * to the accounting file. | |
515 | */ | |
1da177e4 LT |
516 | fs = get_fs(); |
517 | set_fs(KERNEL_DS); | |
518 | /* | |
6ae965cd DW |
519 | * Accounting records are not subject to resource limits. |
520 | */ | |
1da177e4 LT |
521 | flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; |
522 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
523 | file->f_op->write(file, (char *)&ac, | |
524 | sizeof(acct_t), &file->f_pos); | |
525 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim; | |
526 | set_fs(fs); | |
527 | } | |
528 | ||
0e464814 KK |
529 | /** |
530 | * acct_init_pacct - initialize a new pacct_struct | |
1dbe83c3 | 531 | * @pacct: per-process accounting info struct to initialize |
0e464814 KK |
532 | */ |
533 | void acct_init_pacct(struct pacct_struct *pacct) | |
534 | { | |
535 | memset(pacct, 0, sizeof(struct pacct_struct)); | |
77787bfb | 536 | pacct->ac_utime = pacct->ac_stime = cputime_zero; |
0e464814 KK |
537 | } |
538 | ||
539 | /** | |
540 | * acct_collect - collect accounting information into pacct_struct | |
f6ec29a4 KK |
541 | * @exitcode: task exit code |
542 | * @group_dead: not 0, if this thread is the last one in the process. | |
0e464814 | 543 | */ |
f6ec29a4 | 544 | void acct_collect(long exitcode, int group_dead) |
0e464814 KK |
545 | { |
546 | struct pacct_struct *pacct = ¤t->signal->pacct; | |
547 | unsigned long vsize = 0; | |
548 | ||
f6ec29a4 | 549 | if (group_dead && current->mm) { |
0e464814 KK |
550 | struct vm_area_struct *vma; |
551 | down_read(¤t->mm->mmap_sem); | |
552 | vma = current->mm->mmap; | |
553 | while (vma) { | |
554 | vsize += vma->vm_end - vma->vm_start; | |
555 | vma = vma->vm_next; | |
556 | } | |
557 | up_read(¤t->mm->mmap_sem); | |
558 | } | |
559 | ||
77787bfb | 560 | spin_lock_irq(¤t->sighand->siglock); |
f6ec29a4 KK |
561 | if (group_dead) |
562 | pacct->ac_mem = vsize / 1024; | |
563 | if (thread_group_leader(current)) { | |
564 | pacct->ac_exitcode = exitcode; | |
565 | if (current->flags & PF_FORKNOEXEC) | |
566 | pacct->ac_flag |= AFORK; | |
567 | } | |
568 | if (current->flags & PF_SUPERPRIV) | |
569 | pacct->ac_flag |= ASU; | |
570 | if (current->flags & PF_DUMPCORE) | |
571 | pacct->ac_flag |= ACORE; | |
572 | if (current->flags & PF_SIGNALED) | |
573 | pacct->ac_flag |= AXSIG; | |
77787bfb KK |
574 | pacct->ac_utime = cputime_add(pacct->ac_utime, current->utime); |
575 | pacct->ac_stime = cputime_add(pacct->ac_stime, current->stime); | |
576 | pacct->ac_minflt += current->min_flt; | |
577 | pacct->ac_majflt += current->maj_flt; | |
578 | spin_unlock_irq(¤t->sighand->siglock); | |
0e464814 KK |
579 | } |
580 | ||
417ef531 | 581 | /** |
1da177e4 | 582 | * acct_process - now just a wrapper around do_acct_process |
417ef531 RD |
583 | * |
584 | * handles process accounting for an exiting task | |
1da177e4 | 585 | */ |
7f32a25f | 586 | void acct_process(void) |
1da177e4 LT |
587 | { |
588 | struct file *file = NULL; | |
5f7b703f | 589 | struct pid_namespace *ns; |
1da177e4 LT |
590 | |
591 | /* | |
592 | * accelerate the common fastpath: | |
593 | */ | |
594 | if (!acct_globals.file) | |
595 | return; | |
596 | ||
597 | spin_lock(&acct_globals.lock); | |
598 | file = acct_globals.file; | |
599 | if (unlikely(!file)) { | |
600 | spin_unlock(&acct_globals.lock); | |
601 | return; | |
602 | } | |
603 | get_file(file); | |
5f7b703f | 604 | ns = get_pid_ns(acct_globals.ns); |
1da177e4 LT |
605 | spin_unlock(&acct_globals.lock); |
606 | ||
5f7b703f | 607 | do_acct_process(ns, file); |
1da177e4 | 608 | fput(file); |
5f7b703f | 609 | put_pid_ns(ns); |
1da177e4 | 610 | } |