Commit | Line | Data |
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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 | 91 | struct timer_list timer; |
b5a71748 | 92 | struct list_head list; |
1da177e4 LT |
93 | }; |
94 | ||
a75d9797 | 95 | static DEFINE_SPINLOCK(acct_lock); |
b5a71748 | 96 | static LIST_HEAD(acct_list); |
a75d9797 | 97 | |
1da177e4 LT |
98 | /* |
99 | * Called whenever the timer says to check the free space. | |
100 | */ | |
e59a04a7 | 101 | static void acct_timeout(unsigned long x) |
1da177e4 | 102 | { |
e59a04a7 PE |
103 | struct bsd_acct_struct *acct = (struct bsd_acct_struct *)x; |
104 | acct->needcheck = 1; | |
1da177e4 LT |
105 | } |
106 | ||
107 | /* | |
108 | * Check the amount of free space and suspend/resume accordingly. | |
109 | */ | |
6248b1b3 | 110 | static int check_free_space(struct bsd_acct_struct *acct, struct file *file) |
1da177e4 LT |
111 | { |
112 | struct kstatfs sbuf; | |
113 | int res; | |
114 | int act; | |
115 | sector_t resume; | |
116 | sector_t suspend; | |
117 | ||
a75d9797 | 118 | spin_lock(&acct_lock); |
6248b1b3 PE |
119 | res = acct->active; |
120 | if (!file || !acct->needcheck) | |
1da177e4 | 121 | goto out; |
a75d9797 | 122 | spin_unlock(&acct_lock); |
1da177e4 LT |
123 | |
124 | /* May block */ | |
f3a43f3f | 125 | if (vfs_statfs(file->f_path.dentry, &sbuf)) |
1da177e4 LT |
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 | /* | |
6248b1b3 | 141 | * If some joker switched acct->file under us we'ld better be |
1da177e4 LT |
142 | * silent and _not_ touch anything. |
143 | */ | |
a75d9797 | 144 | spin_lock(&acct_lock); |
6248b1b3 | 145 | if (file != acct->file) { |
1da177e4 LT |
146 | if (act) |
147 | res = act>0; | |
148 | goto out; | |
149 | } | |
150 | ||
6248b1b3 | 151 | if (acct->active) { |
1da177e4 | 152 | if (act < 0) { |
6248b1b3 | 153 | acct->active = 0; |
1da177e4 LT |
154 | printk(KERN_INFO "Process accounting paused\n"); |
155 | } | |
156 | } else { | |
157 | if (act > 0) { | |
6248b1b3 | 158 | acct->active = 1; |
1da177e4 LT |
159 | printk(KERN_INFO "Process accounting resumed\n"); |
160 | } | |
161 | } | |
162 | ||
6248b1b3 PE |
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; | |
1da177e4 | 168 | out: |
a75d9797 | 169 | spin_unlock(&acct_lock); |
1da177e4 LT |
170 | return res; |
171 | } | |
172 | ||
173 | /* | |
417ef531 | 174 | * Close the old accounting file (if currently open) and then replace |
1da177e4 LT |
175 | * it with file (if non-NULL). |
176 | * | |
a75d9797 | 177 | * NOTE: acct_lock MUST be held on entry and exit. |
1da177e4 | 178 | */ |
0b6b030f PE |
179 | static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file, |
180 | struct pid_namespace *ns) | |
1da177e4 LT |
181 | { |
182 | struct file *old_acct = NULL; | |
5f7b703f | 183 | struct pid_namespace *old_ns = NULL; |
1da177e4 | 184 | |
6248b1b3 PE |
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; | |
0b6b030f | 192 | acct->ns = NULL; |
b5a71748 | 193 | list_del(&acct->list); |
1da177e4 LT |
194 | } |
195 | if (file) { | |
6248b1b3 | 196 | acct->file = file; |
0b6b030f | 197 | acct->ns = ns; |
6248b1b3 PE |
198 | acct->needcheck = 0; |
199 | acct->active = 1; | |
b5a71748 | 200 | list_add(&acct->list, &acct_list); |
1da177e4 | 201 | /* It's been deleted if it was used before so this is safe */ |
6248b1b3 PE |
202 | setup_timer(&acct->timer, acct_timeout, (unsigned long)acct); |
203 | acct->timer.expires = jiffies + ACCT_TIMEOUT*HZ; | |
204 | add_timer(&acct->timer); | |
1da177e4 LT |
205 | } |
206 | if (old_acct) { | |
f3a43f3f | 207 | mnt_unpin(old_acct->f_path.mnt); |
a75d9797 | 208 | spin_unlock(&acct_lock); |
6248b1b3 | 209 | do_acct_process(acct, old_ns, old_acct); |
1da177e4 | 210 | filp_close(old_acct, NULL); |
a75d9797 | 211 | spin_lock(&acct_lock); |
1da177e4 LT |
212 | } |
213 | } | |
214 | ||
7b7b1ace AV |
215 | static int acct_on(char *name) |
216 | { | |
217 | struct file *file; | |
df279ca8 | 218 | struct vfsmount *mnt; |
7b7b1ace | 219 | int error; |
0b6b030f PE |
220 | struct pid_namespace *ns; |
221 | struct bsd_acct_struct *acct = NULL; | |
7b7b1ace AV |
222 | |
223 | /* Difference from BSD - they don't do O_APPEND */ | |
224 | file = filp_open(name, O_WRONLY|O_APPEND|O_LARGEFILE, 0); | |
225 | if (IS_ERR(file)) | |
226 | return PTR_ERR(file); | |
227 | ||
f3a43f3f | 228 | if (!S_ISREG(file->f_path.dentry->d_inode->i_mode)) { |
7b7b1ace AV |
229 | filp_close(file, NULL); |
230 | return -EACCES; | |
231 | } | |
232 | ||
233 | if (!file->f_op->write) { | |
234 | filp_close(file, NULL); | |
235 | return -EIO; | |
236 | } | |
237 | ||
0b6b030f PE |
238 | ns = task_active_pid_ns(current); |
239 | if (ns->bacct == NULL) { | |
240 | acct = kzalloc(sizeof(struct bsd_acct_struct), GFP_KERNEL); | |
241 | if (acct == NULL) { | |
242 | filp_close(file, NULL); | |
243 | return -ENOMEM; | |
244 | } | |
245 | } | |
246 | ||
7b7b1ace AV |
247 | error = security_acct(file); |
248 | if (error) { | |
0b6b030f | 249 | kfree(acct); |
7b7b1ace AV |
250 | filp_close(file, NULL); |
251 | return error; | |
252 | } | |
253 | ||
a75d9797 | 254 | spin_lock(&acct_lock); |
0b6b030f PE |
255 | if (ns->bacct == NULL) { |
256 | ns->bacct = acct; | |
257 | acct = NULL; | |
258 | } | |
259 | ||
df279ca8 RL |
260 | mnt = file->f_path.mnt; |
261 | mnt_pin(mnt); | |
0b6b030f | 262 | acct_file_reopen(ns->bacct, file, ns); |
a75d9797 | 263 | spin_unlock(&acct_lock); |
7b7b1ace | 264 | |
df279ca8 | 265 | mntput(mnt); /* it's pinned, now give up active reference */ |
0b6b030f | 266 | kfree(acct); |
7b7b1ace AV |
267 | |
268 | return 0; | |
269 | } | |
270 | ||
417ef531 RD |
271 | /** |
272 | * sys_acct - enable/disable process accounting | |
273 | * @name: file name for accounting records or NULL to shutdown accounting | |
274 | * | |
275 | * Returns 0 for success or negative errno values for failure. | |
276 | * | |
277 | * sys_acct() is the only system call needed to implement process | |
278 | * accounting. It takes the name of the file where accounting records | |
279 | * should be written. If the filename is NULL, accounting will be | |
280 | * shutdown. | |
1da177e4 | 281 | */ |
b290ebe2 | 282 | SYSCALL_DEFINE1(acct, const char __user *, name) |
1da177e4 | 283 | { |
1da177e4 LT |
284 | int error; |
285 | ||
286 | if (!capable(CAP_SYS_PACCT)) | |
287 | return -EPERM; | |
288 | ||
289 | if (name) { | |
7b7b1ace AV |
290 | char *tmp = getname(name); |
291 | if (IS_ERR(tmp)) | |
1da177e4 | 292 | return (PTR_ERR(tmp)); |
7b7b1ace | 293 | error = acct_on(tmp); |
1da177e4 | 294 | putname(tmp); |
7b7b1ace | 295 | } else { |
0b6b030f PE |
296 | struct bsd_acct_struct *acct; |
297 | ||
298 | acct = task_active_pid_ns(current)->bacct; | |
299 | if (acct == NULL) | |
300 | return 0; | |
301 | ||
7b7b1ace AV |
302 | error = security_acct(NULL); |
303 | if (!error) { | |
a75d9797 | 304 | spin_lock(&acct_lock); |
0b6b030f | 305 | acct_file_reopen(acct, NULL, NULL); |
a75d9797 | 306 | spin_unlock(&acct_lock); |
1da177e4 LT |
307 | } |
308 | } | |
7b7b1ace AV |
309 | return error; |
310 | } | |
1da177e4 | 311 | |
7b7b1ace AV |
312 | /** |
313 | * acct_auto_close - turn off a filesystem's accounting if it is on | |
314 | * @m: vfsmount being shut down | |
315 | * | |
316 | * If the accounting is turned on for a file in the subtree pointed to | |
317 | * to by m, turn accounting off. Done when m is about to die. | |
318 | */ | |
319 | void acct_auto_close_mnt(struct vfsmount *m) | |
320 | { | |
0b6b030f PE |
321 | struct bsd_acct_struct *acct; |
322 | ||
a75d9797 | 323 | spin_lock(&acct_lock); |
b5a71748 PE |
324 | restart: |
325 | list_for_each_entry(acct, &acct_list, list) | |
326 | if (acct->file && acct->file->f_path.mnt == m) { | |
327 | acct_file_reopen(acct, NULL, NULL); | |
328 | goto restart; | |
329 | } | |
a75d9797 | 330 | spin_unlock(&acct_lock); |
1da177e4 LT |
331 | } |
332 | ||
417ef531 RD |
333 | /** |
334 | * acct_auto_close - turn off a filesystem's accounting if it is on | |
335 | * @sb: super block for the filesystem | |
336 | * | |
337 | * If the accounting is turned on for a file in the filesystem pointed | |
338 | * to by sb, turn accounting off. | |
1da177e4 LT |
339 | */ |
340 | void acct_auto_close(struct super_block *sb) | |
341 | { | |
0b6b030f PE |
342 | struct bsd_acct_struct *acct; |
343 | ||
a75d9797 | 344 | spin_lock(&acct_lock); |
b5a71748 PE |
345 | restart: |
346 | list_for_each_entry(acct, &acct_list, list) | |
347 | if (acct->file && acct->file->f_path.mnt->mnt_sb == sb) { | |
348 | acct_file_reopen(acct, NULL, NULL); | |
349 | goto restart; | |
350 | } | |
0b6b030f PE |
351 | spin_unlock(&acct_lock); |
352 | } | |
353 | ||
354 | void acct_exit_ns(struct pid_namespace *ns) | |
355 | { | |
11cad320 | 356 | struct bsd_acct_struct *acct = ns->bacct; |
0b6b030f | 357 | |
11cad320 VG |
358 | if (acct == NULL) |
359 | return; | |
0b6b030f | 360 | |
11cad320 VG |
361 | del_timer_sync(&acct->timer); |
362 | spin_lock(&acct_lock); | |
363 | if (acct->file != NULL) | |
364 | acct_file_reopen(acct, NULL, NULL); | |
a75d9797 | 365 | spin_unlock(&acct_lock); |
11cad320 VG |
366 | |
367 | kfree(acct); | |
1da177e4 LT |
368 | } |
369 | ||
370 | /* | |
371 | * encode an unsigned long into a comp_t | |
372 | * | |
373 | * This routine has been adopted from the encode_comp_t() function in | |
374 | * the kern_acct.c file of the FreeBSD operating system. The encoding | |
375 | * is a 13-bit fraction with a 3-bit (base 8) exponent. | |
376 | */ | |
377 | ||
378 | #define MANTSIZE 13 /* 13 bit mantissa. */ | |
379 | #define EXPSIZE 3 /* Base 8 (3 bit) exponent. */ | |
380 | #define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */ | |
381 | ||
382 | static comp_t encode_comp_t(unsigned long value) | |
383 | { | |
384 | int exp, rnd; | |
385 | ||
386 | exp = rnd = 0; | |
387 | while (value > MAXFRACT) { | |
388 | rnd = value & (1 << (EXPSIZE - 1)); /* Round up? */ | |
389 | value >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */ | |
390 | exp++; | |
391 | } | |
392 | ||
393 | /* | |
6ae965cd DW |
394 | * If we need to round up, do it (and handle overflow correctly). |
395 | */ | |
1da177e4 LT |
396 | if (rnd && (++value > MAXFRACT)) { |
397 | value >>= EXPSIZE; | |
398 | exp++; | |
399 | } | |
400 | ||
401 | /* | |
6ae965cd DW |
402 | * Clean it up and polish it off. |
403 | */ | |
1da177e4 LT |
404 | exp <<= MANTSIZE; /* Shift the exponent into place */ |
405 | exp += value; /* and add on the mantissa. */ | |
406 | return exp; | |
407 | } | |
408 | ||
409 | #if ACCT_VERSION==1 || ACCT_VERSION==2 | |
410 | /* | |
411 | * encode an u64 into a comp2_t (24 bits) | |
412 | * | |
413 | * Format: 5 bit base 2 exponent, 20 bits mantissa. | |
414 | * The leading bit of the mantissa is not stored, but implied for | |
415 | * non-zero exponents. | |
416 | * Largest encodable value is 50 bits. | |
417 | */ | |
418 | ||
419 | #define MANTSIZE2 20 /* 20 bit mantissa. */ | |
420 | #define EXPSIZE2 5 /* 5 bit base 2 exponent. */ | |
421 | #define MAXFRACT2 ((1ul << MANTSIZE2) - 1) /* Maximum fractional value. */ | |
422 | #define MAXEXP2 ((1 <<EXPSIZE2) - 1) /* Maximum exponent. */ | |
423 | ||
424 | static comp2_t encode_comp2_t(u64 value) | |
425 | { | |
6ae965cd DW |
426 | int exp, rnd; |
427 | ||
428 | exp = (value > (MAXFRACT2>>1)); | |
429 | rnd = 0; | |
430 | while (value > MAXFRACT2) { | |
431 | rnd = value & 1; | |
432 | value >>= 1; | |
433 | exp++; | |
434 | } | |
435 | ||
436 | /* | |
437 | * If we need to round up, do it (and handle overflow correctly). | |
438 | */ | |
439 | if (rnd && (++value > MAXFRACT2)) { | |
440 | value >>= 1; | |
441 | exp++; | |
442 | } | |
443 | ||
444 | if (exp > MAXEXP2) { | |
445 | /* Overflow. Return largest representable number instead. */ | |
446 | return (1ul << (MANTSIZE2+EXPSIZE2-1)) - 1; | |
447 | } else { | |
448 | return (value & (MAXFRACT2>>1)) | (exp << (MANTSIZE2-1)); | |
449 | } | |
1da177e4 LT |
450 | } |
451 | #endif | |
452 | ||
453 | #if ACCT_VERSION==3 | |
454 | /* | |
455 | * encode an u64 into a 32 bit IEEE float | |
456 | */ | |
457 | static u32 encode_float(u64 value) | |
458 | { | |
459 | unsigned exp = 190; | |
460 | unsigned u; | |
461 | ||
462 | if (value==0) return 0; | |
463 | while ((s64)value > 0){ | |
464 | value <<= 1; | |
465 | exp--; | |
466 | } | |
467 | u = (u32)(value >> 40) & 0x7fffffu; | |
468 | return u | (exp << 23); | |
469 | } | |
470 | #endif | |
471 | ||
472 | /* | |
473 | * Write an accounting entry for an exiting process | |
474 | * | |
475 | * The acct_process() call is the workhorse of the process | |
476 | * accounting system. The struct acct is built here and then written | |
477 | * into the accounting file. This function should only be called from | |
bcbe4a07 | 478 | * do_exit() or when switching to a different output file. |
1da177e4 LT |
479 | */ |
480 | ||
481 | /* | |
482 | * do_acct_process does all actual work. Caller holds the reference to file. | |
483 | */ | |
6248b1b3 PE |
484 | static void do_acct_process(struct bsd_acct_struct *acct, |
485 | struct pid_namespace *ns, struct file *file) | |
1da177e4 | 486 | { |
0e464814 | 487 | struct pacct_struct *pacct = ¤t->signal->pacct; |
1da177e4 LT |
488 | acct_t ac; |
489 | mm_segment_t fs; | |
1da177e4 LT |
490 | unsigned long flim; |
491 | u64 elapsed; | |
492 | u64 run_time; | |
493 | struct timespec uptime; | |
24ec839c | 494 | struct tty_struct *tty; |
d8e180dc MS |
495 | const struct cred *orig_cred; |
496 | ||
497 | /* Perform file operations on behalf of whoever enabled accounting */ | |
498 | orig_cred = override_creds(file->f_cred); | |
1da177e4 LT |
499 | |
500 | /* | |
501 | * First check to see if there is enough free_space to continue | |
502 | * the process accounting system. | |
503 | */ | |
6248b1b3 | 504 | if (!check_free_space(acct, file)) |
d8e180dc | 505 | goto out; |
1da177e4 LT |
506 | |
507 | /* | |
508 | * Fill the accounting struct with the needed info as recorded | |
509 | * by the different kernel functions. | |
510 | */ | |
511 | memset((caddr_t)&ac, 0, sizeof(acct_t)); | |
512 | ||
513 | ac.ac_version = ACCT_VERSION | ACCT_BYTEORDER; | |
514 | strlcpy(ac.ac_comm, current->comm, sizeof(ac.ac_comm)); | |
515 | ||
516 | /* calculate run_time in nsec*/ | |
517 | do_posix_clock_monotonic_gettime(&uptime); | |
518 | run_time = (u64)uptime.tv_sec*NSEC_PER_SEC + uptime.tv_nsec; | |
bb231fe3 KK |
519 | run_time -= (u64)current->group_leader->start_time.tv_sec * NSEC_PER_SEC |
520 | + current->group_leader->start_time.tv_nsec; | |
1da177e4 LT |
521 | /* convert nsec -> AHZ */ |
522 | elapsed = nsec_to_AHZ(run_time); | |
523 | #if ACCT_VERSION==3 | |
524 | ac.ac_etime = encode_float(elapsed); | |
525 | #else | |
526 | ac.ac_etime = encode_comp_t(elapsed < (unsigned long) -1l ? | |
527 | (unsigned long) elapsed : (unsigned long) -1l); | |
528 | #endif | |
529 | #if ACCT_VERSION==1 || ACCT_VERSION==2 | |
530 | { | |
531 | /* new enlarged etime field */ | |
532 | comp2_t etime = encode_comp2_t(elapsed); | |
533 | ac.ac_etime_hi = etime >> 16; | |
534 | ac.ac_etime_lo = (u16) etime; | |
535 | } | |
536 | #endif | |
537 | do_div(elapsed, AHZ); | |
2c6b47de | 538 | ac.ac_btime = get_seconds() - elapsed; |
1da177e4 | 539 | /* we really need to bite the bullet and change layout */ |
4b731d50 AD |
540 | ac.ac_uid = orig_cred->uid; |
541 | ac.ac_gid = orig_cred->gid; | |
1da177e4 LT |
542 | #if ACCT_VERSION==2 |
543 | ac.ac_ahz = AHZ; | |
544 | #endif | |
545 | #if ACCT_VERSION==1 || ACCT_VERSION==2 | |
546 | /* backward-compatible 16 bit fields */ | |
76aac0e9 DH |
547 | ac.ac_uid16 = ac.ac_uid; |
548 | ac.ac_gid16 = ac.ac_gid; | |
1da177e4 LT |
549 | #endif |
550 | #if ACCT_VERSION==3 | |
5f7b703f | 551 | ac.ac_pid = task_tgid_nr_ns(current, ns); |
a846a195 | 552 | rcu_read_lock(); |
5f7b703f | 553 | ac.ac_ppid = task_tgid_nr_ns(rcu_dereference(current->real_parent), ns); |
a846a195 | 554 | rcu_read_unlock(); |
1da177e4 LT |
555 | #endif |
556 | ||
a4afee02 | 557 | spin_lock_irq(¤t->sighand->siglock); |
dbda4c0b | 558 | tty = current->signal->tty; /* Safe as we hold the siglock */ |
7bcfa95e | 559 | ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0; |
77787bfb KK |
560 | ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime))); |
561 | ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime))); | |
f6ec29a4 | 562 | ac.ac_flag = pacct->ac_flag; |
0e464814 | 563 | ac.ac_mem = encode_comp_t(pacct->ac_mem); |
77787bfb KK |
564 | ac.ac_minflt = encode_comp_t(pacct->ac_minflt); |
565 | ac.ac_majflt = encode_comp_t(pacct->ac_majflt); | |
f6ec29a4 | 566 | ac.ac_exitcode = pacct->ac_exitcode; |
a4afee02 | 567 | spin_unlock_irq(¤t->sighand->siglock); |
1da177e4 LT |
568 | ac.ac_io = encode_comp_t(0 /* current->io_usage */); /* %% */ |
569 | ac.ac_rw = encode_comp_t(ac.ac_io / 1024); | |
1da177e4 | 570 | ac.ac_swaps = encode_comp_t(0); |
1da177e4 LT |
571 | |
572 | /* | |
6ae965cd DW |
573 | * Kernel segment override to datasegment and write it |
574 | * to the accounting file. | |
575 | */ | |
1da177e4 LT |
576 | fs = get_fs(); |
577 | set_fs(KERNEL_DS); | |
578 | /* | |
6ae965cd DW |
579 | * Accounting records are not subject to resource limits. |
580 | */ | |
1da177e4 LT |
581 | flim = current->signal->rlim[RLIMIT_FSIZE].rlim_cur; |
582 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
583 | file->f_op->write(file, (char *)&ac, | |
584 | sizeof(acct_t), &file->f_pos); | |
585 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim; | |
586 | set_fs(fs); | |
d8e180dc MS |
587 | out: |
588 | revert_creds(orig_cred); | |
1da177e4 LT |
589 | } |
590 | ||
0e464814 KK |
591 | /** |
592 | * acct_collect - collect accounting information into pacct_struct | |
f6ec29a4 KK |
593 | * @exitcode: task exit code |
594 | * @group_dead: not 0, if this thread is the last one in the process. | |
0e464814 | 595 | */ |
f6ec29a4 | 596 | void acct_collect(long exitcode, int group_dead) |
0e464814 KK |
597 | { |
598 | struct pacct_struct *pacct = ¤t->signal->pacct; | |
599 | unsigned long vsize = 0; | |
600 | ||
f6ec29a4 | 601 | if (group_dead && current->mm) { |
0e464814 KK |
602 | struct vm_area_struct *vma; |
603 | down_read(¤t->mm->mmap_sem); | |
604 | vma = current->mm->mmap; | |
605 | while (vma) { | |
606 | vsize += vma->vm_end - vma->vm_start; | |
607 | vma = vma->vm_next; | |
608 | } | |
609 | up_read(¤t->mm->mmap_sem); | |
610 | } | |
611 | ||
77787bfb | 612 | spin_lock_irq(¤t->sighand->siglock); |
f6ec29a4 KK |
613 | if (group_dead) |
614 | pacct->ac_mem = vsize / 1024; | |
615 | if (thread_group_leader(current)) { | |
616 | pacct->ac_exitcode = exitcode; | |
617 | if (current->flags & PF_FORKNOEXEC) | |
618 | pacct->ac_flag |= AFORK; | |
619 | } | |
620 | if (current->flags & PF_SUPERPRIV) | |
621 | pacct->ac_flag |= ASU; | |
622 | if (current->flags & PF_DUMPCORE) | |
623 | pacct->ac_flag |= ACORE; | |
624 | if (current->flags & PF_SIGNALED) | |
625 | pacct->ac_flag |= AXSIG; | |
77787bfb KK |
626 | pacct->ac_utime = cputime_add(pacct->ac_utime, current->utime); |
627 | pacct->ac_stime = cputime_add(pacct->ac_stime, current->stime); | |
628 | pacct->ac_minflt += current->min_flt; | |
629 | pacct->ac_majflt += current->maj_flt; | |
630 | spin_unlock_irq(¤t->sighand->siglock); | |
0e464814 KK |
631 | } |
632 | ||
7d1e1350 | 633 | static void acct_process_in_ns(struct pid_namespace *ns) |
1da177e4 LT |
634 | { |
635 | struct file *file = NULL; | |
0b6b030f | 636 | struct bsd_acct_struct *acct; |
1da177e4 | 637 | |
0b6b030f | 638 | acct = ns->bacct; |
1da177e4 LT |
639 | /* |
640 | * accelerate the common fastpath: | |
641 | */ | |
0b6b030f | 642 | if (!acct || !acct->file) |
1da177e4 LT |
643 | return; |
644 | ||
a75d9797 | 645 | spin_lock(&acct_lock); |
0b6b030f | 646 | file = acct->file; |
1da177e4 | 647 | if (unlikely(!file)) { |
a75d9797 | 648 | spin_unlock(&acct_lock); |
1da177e4 LT |
649 | return; |
650 | } | |
651 | get_file(file); | |
a75d9797 | 652 | spin_unlock(&acct_lock); |
1da177e4 | 653 | |
0b6b030f | 654 | do_acct_process(acct, ns, file); |
1da177e4 LT |
655 | fput(file); |
656 | } | |
7d1e1350 PE |
657 | |
658 | /** | |
0c18d7a5 PE |
659 | * acct_process - now just a wrapper around acct_process_in_ns, |
660 | * which in turn is a wrapper around do_acct_process. | |
7d1e1350 PE |
661 | * |
662 | * handles process accounting for an exiting task | |
663 | */ | |
664 | void acct_process(void) | |
665 | { | |
666 | struct pid_namespace *ns; | |
667 | ||
0c18d7a5 PE |
668 | /* |
669 | * This loop is safe lockless, since current is still | |
670 | * alive and holds its namespace, which in turn holds | |
671 | * its parent. | |
672 | */ | |
7d1e1350 PE |
673 | for (ns = task_active_pid_ns(current); ns != NULL; ns = ns->parent) |
674 | acct_process_in_ns(ns); | |
675 | } |