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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 | */ | |
6248b1b3 PE |
78 | static 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 | 86 | struct 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 |
94 | static DEFINE_SPINLOCK(acct_lock); |
95 | ||
1da177e4 LT |
96 | /* |
97 | * Called whenever the timer says to check the free space. | |
98 | */ | |
e59a04a7 | 99 | static 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 | 108 | static 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 | 166 | out: |
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 |
177 | static 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 |
211 | static 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 | */ |
276 | asmlinkage 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 | */ | |
313 | void 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 | */ |
334 | void 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 | ||
348 | void 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 | ||
375 | static 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 | ||
417 | static 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 | */ | |
450 | static 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 |
477 | static 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 = ¤t->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(¤t->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(¤t->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 | */ |
582 | void 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 | 593 | void acct_collect(long exitcode, int group_dead) |
0e464814 KK |
594 | { |
595 | struct pacct_struct *pacct = ¤t->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(¤t->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(¤t->mm->mmap_sem); | |
607 | } | |
608 | ||
77787bfb | 609 | spin_lock_irq(¤t->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(¤t->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 | 635 | void 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 | } |