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[PATCH] swsusp: update documentation
[linux-2.6/mini2440.git] / kernel / sysctl.c
blob8e56e2495542be41fa688aa7a15604cb2e3e6897
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/proc_fs.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/capability.h>
31 #include <linux/smp_lock.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/net.h>
35 #include <linux/sysrq.h>
36 #include <linux/highuid.h>
37 #include <linux/writeback.h>
38 #include <linux/hugetlb.h>
39 #include <linux/security.h>
40 #include <linux/initrd.h>
41 #include <linux/times.h>
42 #include <linux/limits.h>
43 #include <linux/dcache.h>
44 #include <linux/syscalls.h>
45
46 #include <asm/uaccess.h>
47 #include <asm/processor.h>
48
49 #ifdef CONFIG_ROOT_NFS
50 #include <linux/nfs_fs.h>
51 #endif
52
53 #if defined(CONFIG_SYSCTL)
54
55 /* External variables not in a header file. */
56 extern int C_A_D;
57 extern int sysctl_overcommit_memory;
58 extern int sysctl_overcommit_ratio;
59 extern int max_threads;
60 extern int sysrq_enabled;
61 extern int core_uses_pid;
62 extern int suid_dumpable;
63 extern char core_pattern[];
64 extern int cad_pid;
65 extern int pid_max;
66 extern int min_free_kbytes;
67 extern int printk_ratelimit_jiffies;
68 extern int printk_ratelimit_burst;
69 extern int pid_max_min, pid_max_max;
70
71 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
72 int unknown_nmi_panic;
73 extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
74 void __user *, size_t *, loff_t *);
75 #endif
76
77 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
78 static int maxolduid = 65535;
79 static int minolduid;
80
81 static int ngroups_max = NGROUPS_MAX;
82
83 #ifdef CONFIG_KMOD
84 extern char modprobe_path[];
85 #endif
86 #ifdef CONFIG_HOTPLUG
87 extern char hotplug_path[];
88 #endif
89 #ifdef CONFIG_CHR_DEV_SG
90 extern int sg_big_buff;
91 #endif
92 #ifdef CONFIG_SYSVIPC
93 extern size_t shm_ctlmax;
94 extern size_t shm_ctlall;
95 extern int shm_ctlmni;
96 extern int msg_ctlmax;
97 extern int msg_ctlmnb;
98 extern int msg_ctlmni;
99 extern int sem_ctls[];
100 #endif
101
102 #ifdef __sparc__
103 extern char reboot_command [];
104 extern int stop_a_enabled;
105 extern int scons_pwroff;
106 #endif
107
108 #ifdef __hppa__
109 extern int pwrsw_enabled;
110 extern int unaligned_enabled;
111 #endif
112
113 #ifdef CONFIG_ARCH_S390
114 #ifdef CONFIG_MATHEMU
115 extern int sysctl_ieee_emulation_warnings;
116 #endif
117 extern int sysctl_userprocess_debug;
118 extern int spin_retry;
119 #endif
120
121 extern int sysctl_hz_timer;
122
123 #ifdef CONFIG_BSD_PROCESS_ACCT
124 extern int acct_parm[];
125 #endif
126
127 int randomize_va_space = 1;
128
129 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
130 ctl_table *, void **);
131 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
132 void __user *buffer, size_t *lenp, loff_t *ppos);
133
134 static ctl_table root_table[];
135 static struct ctl_table_header root_table_header =
136 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
137
138 static ctl_table kern_table[];
139 static ctl_table vm_table[];
140 static ctl_table proc_table[];
141 static ctl_table fs_table[];
142 static ctl_table debug_table[];
143 static ctl_table dev_table[];
144 extern ctl_table random_table[];
145 #ifdef CONFIG_UNIX98_PTYS
146 extern ctl_table pty_table[];
147 #endif
148 #ifdef CONFIG_INOTIFY
149 extern ctl_table inotify_table[];
150 #endif
151
152 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
153 int sysctl_legacy_va_layout;
154 #endif
155
156 /* /proc declarations: */
157
158 #ifdef CONFIG_PROC_FS
159
160 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
161 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
162 static int proc_opensys(struct inode *, struct file *);
163
164 struct file_operations proc_sys_file_operations = {
165 .open = proc_opensys,
166 .read = proc_readsys,
167 .write = proc_writesys,
168 };
169
170 extern struct proc_dir_entry *proc_sys_root;
171
172 static void register_proc_table(ctl_table *, struct proc_dir_entry *);
173 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
174 #endif
175
176 /* The default sysctl tables: */
177
178 static ctl_table root_table[] = {
179 {
180 .ctl_name = CTL_KERN,
181 .procname = "kernel",
182 .mode = 0555,
183 .child = kern_table,
184 },
185 {
186 .ctl_name = CTL_VM,
187 .procname = "vm",
188 .mode = 0555,
189 .child = vm_table,
190 },
191 #ifdef CONFIG_NET
192 {
193 .ctl_name = CTL_NET,
194 .procname = "net",
195 .mode = 0555,
196 .child = net_table,
197 },
198 #endif
199 {
200 .ctl_name = CTL_PROC,
201 .procname = "proc",
202 .mode = 0555,
203 .child = proc_table,
204 },
205 {
206 .ctl_name = CTL_FS,
207 .procname = "fs",
208 .mode = 0555,
209 .child = fs_table,
210 },
211 {
212 .ctl_name = CTL_DEBUG,
213 .procname = "debug",
214 .mode = 0555,
215 .child = debug_table,
216 },
217 {
218 .ctl_name = CTL_DEV,
219 .procname = "dev",
220 .mode = 0555,
221 .child = dev_table,
222 },
223
224 { .ctl_name = 0 }
225 };
226
227 static ctl_table kern_table[] = {
228 {
229 .ctl_name = KERN_OSTYPE,
230 .procname = "ostype",
231 .data = system_utsname.sysname,
232 .maxlen = sizeof(system_utsname.sysname),
233 .mode = 0444,
234 .proc_handler = &proc_doutsstring,
235 .strategy = &sysctl_string,
236 },
237 {
238 .ctl_name = KERN_OSRELEASE,
239 .procname = "osrelease",
240 .data = system_utsname.release,
241 .maxlen = sizeof(system_utsname.release),
242 .mode = 0444,
243 .proc_handler = &proc_doutsstring,
244 .strategy = &sysctl_string,
245 },
246 {
247 .ctl_name = KERN_VERSION,
248 .procname = "version",
249 .data = system_utsname.version,
250 .maxlen = sizeof(system_utsname.version),
251 .mode = 0444,
252 .proc_handler = &proc_doutsstring,
253 .strategy = &sysctl_string,
254 },
255 {
256 .ctl_name = KERN_NODENAME,
257 .procname = "hostname",
258 .data = system_utsname.nodename,
259 .maxlen = sizeof(system_utsname.nodename),
260 .mode = 0644,
261 .proc_handler = &proc_doutsstring,
262 .strategy = &sysctl_string,
263 },
264 {
265 .ctl_name = KERN_DOMAINNAME,
266 .procname = "domainname",
267 .data = system_utsname.domainname,
268 .maxlen = sizeof(system_utsname.domainname),
269 .mode = 0644,
270 .proc_handler = &proc_doutsstring,
271 .strategy = &sysctl_string,
272 },
273 {
274 .ctl_name = KERN_PANIC,
275 .procname = "panic",
276 .data = &panic_timeout,
277 .maxlen = sizeof(int),
278 .mode = 0644,
279 .proc_handler = &proc_dointvec,
280 },
281 {
282 .ctl_name = KERN_CORE_USES_PID,
283 .procname = "core_uses_pid",
284 .data = &core_uses_pid,
285 .maxlen = sizeof(int),
286 .mode = 0644,
287 .proc_handler = &proc_dointvec,
288 },
289 {
290 .ctl_name = KERN_CORE_PATTERN,
291 .procname = "core_pattern",
292 .data = core_pattern,
293 .maxlen = 64,
294 .mode = 0644,
295 .proc_handler = &proc_dostring,
296 .strategy = &sysctl_string,
297 },
298 {
299 .ctl_name = KERN_TAINTED,
300 .procname = "tainted",
301 .data = &tainted,
302 .maxlen = sizeof(int),
303 .mode = 0444,
304 .proc_handler = &proc_dointvec,
305 },
306 {
307 .ctl_name = KERN_CAP_BSET,
308 .procname = "cap-bound",
309 .data = &cap_bset,
310 .maxlen = sizeof(kernel_cap_t),
311 .mode = 0600,
312 .proc_handler = &proc_dointvec_bset,
313 },
314 #ifdef CONFIG_BLK_DEV_INITRD
315 {
316 .ctl_name = KERN_REALROOTDEV,
317 .procname = "real-root-dev",
318 .data = &real_root_dev,
319 .maxlen = sizeof(int),
320 .mode = 0644,
321 .proc_handler = &proc_dointvec,
322 },
323 #endif
324 #ifdef __sparc__
325 {
326 .ctl_name = KERN_SPARC_REBOOT,
327 .procname = "reboot-cmd",
328 .data = reboot_command,
329 .maxlen = 256,
330 .mode = 0644,
331 .proc_handler = &proc_dostring,
332 .strategy = &sysctl_string,
333 },
334 {
335 .ctl_name = KERN_SPARC_STOP_A,
336 .procname = "stop-a",
337 .data = &stop_a_enabled,
338 .maxlen = sizeof (int),
339 .mode = 0644,
340 .proc_handler = &proc_dointvec,
341 },
342 {
343 .ctl_name = KERN_SPARC_SCONS_PWROFF,
344 .procname = "scons-poweroff",
345 .data = &scons_pwroff,
346 .maxlen = sizeof (int),
347 .mode = 0644,
348 .proc_handler = &proc_dointvec,
349 },
350 #endif
351 #ifdef __hppa__
352 {
353 .ctl_name = KERN_HPPA_PWRSW,
354 .procname = "soft-power",
355 .data = &pwrsw_enabled,
356 .maxlen = sizeof (int),
357 .mode = 0644,
358 .proc_handler = &proc_dointvec,
359 },
360 {
361 .ctl_name = KERN_HPPA_UNALIGNED,
362 .procname = "unaligned-trap",
363 .data = &unaligned_enabled,
364 .maxlen = sizeof (int),
365 .mode = 0644,
366 .proc_handler = &proc_dointvec,
367 },
368 #endif
369 {
370 .ctl_name = KERN_CTLALTDEL,
371 .procname = "ctrl-alt-del",
372 .data = &C_A_D,
373 .maxlen = sizeof(int),
374 .mode = 0644,
375 .proc_handler = &proc_dointvec,
376 },
377 {
378 .ctl_name = KERN_PRINTK,
379 .procname = "printk",
380 .data = &console_loglevel,
381 .maxlen = 4*sizeof(int),
382 .mode = 0644,
383 .proc_handler = &proc_dointvec,
384 },
385 #ifdef CONFIG_KMOD
386 {
387 .ctl_name = KERN_MODPROBE,
388 .procname = "modprobe",
389 .data = &modprobe_path,
390 .maxlen = KMOD_PATH_LEN,
391 .mode = 0644,
392 .proc_handler = &proc_dostring,
393 .strategy = &sysctl_string,
394 },
395 #endif
396 #ifdef CONFIG_HOTPLUG
397 {
398 .ctl_name = KERN_HOTPLUG,
399 .procname = "hotplug",
400 .data = &hotplug_path,
401 .maxlen = HOTPLUG_PATH_LEN,
402 .mode = 0644,
403 .proc_handler = &proc_dostring,
404 .strategy = &sysctl_string,
405 },
406 #endif
407 #ifdef CONFIG_CHR_DEV_SG
408 {
409 .ctl_name = KERN_SG_BIG_BUFF,
410 .procname = "sg-big-buff",
411 .data = &sg_big_buff,
412 .maxlen = sizeof (int),
413 .mode = 0444,
414 .proc_handler = &proc_dointvec,
415 },
416 #endif
417 #ifdef CONFIG_BSD_PROCESS_ACCT
418 {
419 .ctl_name = KERN_ACCT,
420 .procname = "acct",
421 .data = &acct_parm,
422 .maxlen = 3*sizeof(int),
423 .mode = 0644,
424 .proc_handler = &proc_dointvec,
425 },
426 #endif
427 #ifdef CONFIG_SYSVIPC
428 {
429 .ctl_name = KERN_SHMMAX,
430 .procname = "shmmax",
431 .data = &shm_ctlmax,
432 .maxlen = sizeof (size_t),
433 .mode = 0644,
434 .proc_handler = &proc_doulongvec_minmax,
435 },
436 {
437 .ctl_name = KERN_SHMALL,
438 .procname = "shmall",
439 .data = &shm_ctlall,
440 .maxlen = sizeof (size_t),
441 .mode = 0644,
442 .proc_handler = &proc_doulongvec_minmax,
443 },
444 {
445 .ctl_name = KERN_SHMMNI,
446 .procname = "shmmni",
447 .data = &shm_ctlmni,
448 .maxlen = sizeof (int),
449 .mode = 0644,
450 .proc_handler = &proc_dointvec,
451 },
452 {
453 .ctl_name = KERN_MSGMAX,
454 .procname = "msgmax",
455 .data = &msg_ctlmax,
456 .maxlen = sizeof (int),
457 .mode = 0644,
458 .proc_handler = &proc_dointvec,
459 },
460 {
461 .ctl_name = KERN_MSGMNI,
462 .procname = "msgmni",
463 .data = &msg_ctlmni,
464 .maxlen = sizeof (int),
465 .mode = 0644,
466 .proc_handler = &proc_dointvec,
467 },
468 {
469 .ctl_name = KERN_MSGMNB,
470 .procname = "msgmnb",
471 .data = &msg_ctlmnb,
472 .maxlen = sizeof (int),
473 .mode = 0644,
474 .proc_handler = &proc_dointvec,
475 },
476 {
477 .ctl_name = KERN_SEM,
478 .procname = "sem",
479 .data = &sem_ctls,
480 .maxlen = 4*sizeof (int),
481 .mode = 0644,
482 .proc_handler = &proc_dointvec,
483 },
484 #endif
485 #ifdef CONFIG_MAGIC_SYSRQ
486 {
487 .ctl_name = KERN_SYSRQ,
488 .procname = "sysrq",
489 .data = &sysrq_enabled,
490 .maxlen = sizeof (int),
491 .mode = 0644,
492 .proc_handler = &proc_dointvec,
493 },
494 #endif
495 {
496 .ctl_name = KERN_CADPID,
497 .procname = "cad_pid",
498 .data = &cad_pid,
499 .maxlen = sizeof (int),
500 .mode = 0600,
501 .proc_handler = &proc_dointvec,
502 },
503 {
504 .ctl_name = KERN_MAX_THREADS,
505 .procname = "threads-max",
506 .data = &max_threads,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = &proc_dointvec,
510 },
511 {
512 .ctl_name = KERN_RANDOM,
513 .procname = "random",
514 .mode = 0555,
515 .child = random_table,
516 },
517 #ifdef CONFIG_UNIX98_PTYS
518 {
519 .ctl_name = KERN_PTY,
520 .procname = "pty",
521 .mode = 0555,
522 .child = pty_table,
523 },
524 #endif
525 {
526 .ctl_name = KERN_OVERFLOWUID,
527 .procname = "overflowuid",
528 .data = &overflowuid,
529 .maxlen = sizeof(int),
530 .mode = 0644,
531 .proc_handler = &proc_dointvec_minmax,
532 .strategy = &sysctl_intvec,
533 .extra1 = &minolduid,
534 .extra2 = &maxolduid,
535 },
536 {
537 .ctl_name = KERN_OVERFLOWGID,
538 .procname = "overflowgid",
539 .data = &overflowgid,
540 .maxlen = sizeof(int),
541 .mode = 0644,
542 .proc_handler = &proc_dointvec_minmax,
543 .strategy = &sysctl_intvec,
544 .extra1 = &minolduid,
545 .extra2 = &maxolduid,
546 },
547 #ifdef CONFIG_ARCH_S390
548 #ifdef CONFIG_MATHEMU
549 {
550 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
551 .procname = "ieee_emulation_warnings",
552 .data = &sysctl_ieee_emulation_warnings,
553 .maxlen = sizeof(int),
554 .mode = 0644,
555 .proc_handler = &proc_dointvec,
556 },
557 #endif
558 #ifdef CONFIG_NO_IDLE_HZ
559 {
560 .ctl_name = KERN_HZ_TIMER,
561 .procname = "hz_timer",
562 .data = &sysctl_hz_timer,
563 .maxlen = sizeof(int),
564 .mode = 0644,
565 .proc_handler = &proc_dointvec,
566 },
567 #endif
568 {
569 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
570 .procname = "userprocess_debug",
571 .data = &sysctl_userprocess_debug,
572 .maxlen = sizeof(int),
573 .mode = 0644,
574 .proc_handler = &proc_dointvec,
575 },
576 #endif
577 {
578 .ctl_name = KERN_PIDMAX,
579 .procname = "pid_max",
580 .data = &pid_max,
581 .maxlen = sizeof (int),
582 .mode = 0644,
583 .proc_handler = &proc_dointvec_minmax,
584 .strategy = sysctl_intvec,
585 .extra1 = &pid_max_min,
586 .extra2 = &pid_max_max,
587 },
588 {
589 .ctl_name = KERN_PANIC_ON_OOPS,
590 .procname = "panic_on_oops",
591 .data = &panic_on_oops,
592 .maxlen = sizeof(int),
593 .mode = 0644,
594 .proc_handler = &proc_dointvec,
595 },
596 {
597 .ctl_name = KERN_PRINTK_RATELIMIT,
598 .procname = "printk_ratelimit",
599 .data = &printk_ratelimit_jiffies,
600 .maxlen = sizeof(int),
601 .mode = 0644,
602 .proc_handler = &proc_dointvec_jiffies,
603 .strategy = &sysctl_jiffies,
604 },
605 {
606 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
607 .procname = "printk_ratelimit_burst",
608 .data = &printk_ratelimit_burst,
609 .maxlen = sizeof(int),
610 .mode = 0644,
611 .proc_handler = &proc_dointvec,
612 },
613 {
614 .ctl_name = KERN_NGROUPS_MAX,
615 .procname = "ngroups_max",
616 .data = &ngroups_max,
617 .maxlen = sizeof (int),
618 .mode = 0444,
619 .proc_handler = &proc_dointvec,
620 },
621 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
622 {
623 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
624 .procname = "unknown_nmi_panic",
625 .data = &unknown_nmi_panic,
626 .maxlen = sizeof (int),
627 .mode = 0644,
628 .proc_handler = &proc_unknown_nmi_panic,
629 },
630 #endif
631 #if defined(CONFIG_X86)
632 {
633 .ctl_name = KERN_BOOTLOADER_TYPE,
634 .procname = "bootloader_type",
635 .data = &bootloader_type,
636 .maxlen = sizeof (int),
637 .mode = 0444,
638 .proc_handler = &proc_dointvec,
639 },
640 #endif
641 {
642 .ctl_name = KERN_RANDOMIZE,
643 .procname = "randomize_va_space",
644 .data = &randomize_va_space,
645 .maxlen = sizeof(int),
646 .mode = 0644,
647 .proc_handler = &proc_dointvec,
648 },
649 #if defined(CONFIG_ARCH_S390)
650 {
651 .ctl_name = KERN_SPIN_RETRY,
652 .procname = "spin_retry",
653 .data = &spin_retry,
654 .maxlen = sizeof (int),
655 .mode = 0644,
656 .proc_handler = &proc_dointvec,
657 },
658 #endif
659 { .ctl_name = 0 }
660 };
661
662 /* Constants for minimum and maximum testing in vm_table.
663 We use these as one-element integer vectors. */
664 static int zero;
665 static int one_hundred = 100;
666
667
668 static ctl_table vm_table[] = {
669 {
670 .ctl_name = VM_OVERCOMMIT_MEMORY,
671 .procname = "overcommit_memory",
672 .data = &sysctl_overcommit_memory,
673 .maxlen = sizeof(sysctl_overcommit_memory),
674 .mode = 0644,
675 .proc_handler = &proc_dointvec,
676 },
677 {
678 .ctl_name = VM_OVERCOMMIT_RATIO,
679 .procname = "overcommit_ratio",
680 .data = &sysctl_overcommit_ratio,
681 .maxlen = sizeof(sysctl_overcommit_ratio),
682 .mode = 0644,
683 .proc_handler = &proc_dointvec,
684 },
685 {
686 .ctl_name = VM_PAGE_CLUSTER,
687 .procname = "page-cluster",
688 .data = &page_cluster,
689 .maxlen = sizeof(int),
690 .mode = 0644,
691 .proc_handler = &proc_dointvec,
692 },
693 {
694 .ctl_name = VM_DIRTY_BACKGROUND,
695 .procname = "dirty_background_ratio",
696 .data = &dirty_background_ratio,
697 .maxlen = sizeof(dirty_background_ratio),
698 .mode = 0644,
699 .proc_handler = &proc_dointvec_minmax,
700 .strategy = &sysctl_intvec,
701 .extra1 = &zero,
702 .extra2 = &one_hundred,
703 },
704 {
705 .ctl_name = VM_DIRTY_RATIO,
706 .procname = "dirty_ratio",
707 .data = &vm_dirty_ratio,
708 .maxlen = sizeof(vm_dirty_ratio),
709 .mode = 0644,
710 .proc_handler = &proc_dointvec_minmax,
711 .strategy = &sysctl_intvec,
712 .extra1 = &zero,
713 .extra2 = &one_hundred,
714 },
715 {
716 .ctl_name = VM_DIRTY_WB_CS,
717 .procname = "dirty_writeback_centisecs",
718 .data = &dirty_writeback_centisecs,
719 .maxlen = sizeof(dirty_writeback_centisecs),
720 .mode = 0644,
721 .proc_handler = &dirty_writeback_centisecs_handler,
722 },
723 {
724 .ctl_name = VM_DIRTY_EXPIRE_CS,
725 .procname = "dirty_expire_centisecs",
726 .data = &dirty_expire_centisecs,
727 .maxlen = sizeof(dirty_expire_centisecs),
728 .mode = 0644,
729 .proc_handler = &proc_dointvec,
730 },
731 {
732 .ctl_name = VM_NR_PDFLUSH_THREADS,
733 .procname = "nr_pdflush_threads",
734 .data = &nr_pdflush_threads,
735 .maxlen = sizeof nr_pdflush_threads,
736 .mode = 0444 /* read-only*/,
737 .proc_handler = &proc_dointvec,
738 },
739 {
740 .ctl_name = VM_SWAPPINESS,
741 .procname = "swappiness",
742 .data = &vm_swappiness,
743 .maxlen = sizeof(vm_swappiness),
744 .mode = 0644,
745 .proc_handler = &proc_dointvec_minmax,
746 .strategy = &sysctl_intvec,
747 .extra1 = &zero,
748 .extra2 = &one_hundred,
749 },
750 #ifdef CONFIG_HUGETLB_PAGE
751 {
752 .ctl_name = VM_HUGETLB_PAGES,
753 .procname = "nr_hugepages",
754 .data = &max_huge_pages,
755 .maxlen = sizeof(unsigned long),
756 .mode = 0644,
757 .proc_handler = &hugetlb_sysctl_handler,
758 .extra1 = (void *)&hugetlb_zero,
759 .extra2 = (void *)&hugetlb_infinity,
760 },
761 {
762 .ctl_name = VM_HUGETLB_GROUP,
763 .procname = "hugetlb_shm_group",
764 .data = &sysctl_hugetlb_shm_group,
765 .maxlen = sizeof(gid_t),
766 .mode = 0644,
767 .proc_handler = &proc_dointvec,
768 },
769 #endif
770 {
771 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
772 .procname = "lowmem_reserve_ratio",
773 .data = &sysctl_lowmem_reserve_ratio,
774 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
775 .mode = 0644,
776 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
777 .strategy = &sysctl_intvec,
778 },
779 {
780 .ctl_name = VM_MIN_FREE_KBYTES,
781 .procname = "min_free_kbytes",
782 .data = &min_free_kbytes,
783 .maxlen = sizeof(min_free_kbytes),
784 .mode = 0644,
785 .proc_handler = &min_free_kbytes_sysctl_handler,
786 .strategy = &sysctl_intvec,
787 .extra1 = &zero,
788 },
789 #ifdef CONFIG_MMU
790 {
791 .ctl_name = VM_MAX_MAP_COUNT,
792 .procname = "max_map_count",
793 .data = &sysctl_max_map_count,
794 .maxlen = sizeof(sysctl_max_map_count),
795 .mode = 0644,
796 .proc_handler = &proc_dointvec
797 },
798 #endif
799 {
800 .ctl_name = VM_LAPTOP_MODE,
801 .procname = "laptop_mode",
802 .data = &laptop_mode,
803 .maxlen = sizeof(laptop_mode),
804 .mode = 0644,
805 .proc_handler = &proc_dointvec,
806 .strategy = &sysctl_intvec,
807 .extra1 = &zero,
808 },
809 {
810 .ctl_name = VM_BLOCK_DUMP,
811 .procname = "block_dump",
812 .data = &block_dump,
813 .maxlen = sizeof(block_dump),
814 .mode = 0644,
815 .proc_handler = &proc_dointvec,
816 .strategy = &sysctl_intvec,
817 .extra1 = &zero,
818 },
819 {
820 .ctl_name = VM_VFS_CACHE_PRESSURE,
821 .procname = "vfs_cache_pressure",
822 .data = &sysctl_vfs_cache_pressure,
823 .maxlen = sizeof(sysctl_vfs_cache_pressure),
824 .mode = 0644,
825 .proc_handler = &proc_dointvec,
826 .strategy = &sysctl_intvec,
827 .extra1 = &zero,
828 },
829 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
830 {
831 .ctl_name = VM_LEGACY_VA_LAYOUT,
832 .procname = "legacy_va_layout",
833 .data = &sysctl_legacy_va_layout,
834 .maxlen = sizeof(sysctl_legacy_va_layout),
835 .mode = 0644,
836 .proc_handler = &proc_dointvec,
837 .strategy = &sysctl_intvec,
838 .extra1 = &zero,
839 },
840 #endif
841 #ifdef CONFIG_SWAP
842 {
843 .ctl_name = VM_SWAP_TOKEN_TIMEOUT,
844 .procname = "swap_token_timeout",
845 .data = &swap_token_default_timeout,
846 .maxlen = sizeof(swap_token_default_timeout),
847 .mode = 0644,
848 .proc_handler = &proc_dointvec_jiffies,
849 .strategy = &sysctl_jiffies,
850 },
851 #endif
852 { .ctl_name = 0 }
853 };
854
855 static ctl_table proc_table[] = {
856 { .ctl_name = 0 }
857 };
858
859 static ctl_table fs_table[] = {
860 {
861 .ctl_name = FS_NRINODE,
862 .procname = "inode-nr",
863 .data = &inodes_stat,
864 .maxlen = 2*sizeof(int),
865 .mode = 0444,
866 .proc_handler = &proc_dointvec,
867 },
868 {
869 .ctl_name = FS_STATINODE,
870 .procname = "inode-state",
871 .data = &inodes_stat,
872 .maxlen = 7*sizeof(int),
873 .mode = 0444,
874 .proc_handler = &proc_dointvec,
875 },
876 {
877 .ctl_name = FS_NRFILE,
878 .procname = "file-nr",
879 .data = &files_stat,
880 .maxlen = 3*sizeof(int),
881 .mode = 0444,
882 .proc_handler = &proc_dointvec,
883 },
884 {
885 .ctl_name = FS_MAXFILE,
886 .procname = "file-max",
887 .data = &files_stat.max_files,
888 .maxlen = sizeof(int),
889 .mode = 0644,
890 .proc_handler = &proc_dointvec,
891 },
892 {
893 .ctl_name = FS_DENTRY,
894 .procname = "dentry-state",
895 .data = &dentry_stat,
896 .maxlen = 6*sizeof(int),
897 .mode = 0444,
898 .proc_handler = &proc_dointvec,
899 },
900 {
901 .ctl_name = FS_OVERFLOWUID,
902 .procname = "overflowuid",
903 .data = &fs_overflowuid,
904 .maxlen = sizeof(int),
905 .mode = 0644,
906 .proc_handler = &proc_dointvec_minmax,
907 .strategy = &sysctl_intvec,
908 .extra1 = &minolduid,
909 .extra2 = &maxolduid,
910 },
911 {
912 .ctl_name = FS_OVERFLOWGID,
913 .procname = "overflowgid",
914 .data = &fs_overflowgid,
915 .maxlen = sizeof(int),
916 .mode = 0644,
917 .proc_handler = &proc_dointvec_minmax,
918 .strategy = &sysctl_intvec,
919 .extra1 = &minolduid,
920 .extra2 = &maxolduid,
921 },
922 {
923 .ctl_name = FS_LEASES,
924 .procname = "leases-enable",
925 .data = &leases_enable,
926 .maxlen = sizeof(int),
927 .mode = 0644,
928 .proc_handler = &proc_dointvec,
929 },
930 #ifdef CONFIG_DNOTIFY
931 {
932 .ctl_name = FS_DIR_NOTIFY,
933 .procname = "dir-notify-enable",
934 .data = &dir_notify_enable,
935 .maxlen = sizeof(int),
936 .mode = 0644,
937 .proc_handler = &proc_dointvec,
938 },
939 #endif
940 #ifdef CONFIG_MMU
941 {
942 .ctl_name = FS_LEASE_TIME,
943 .procname = "lease-break-time",
944 .data = &lease_break_time,
945 .maxlen = sizeof(int),
946 .mode = 0644,
947 .proc_handler = &proc_dointvec,
948 },
949 {
950 .ctl_name = FS_AIO_NR,
951 .procname = "aio-nr",
952 .data = &aio_nr,
953 .maxlen = sizeof(aio_nr),
954 .mode = 0444,
955 .proc_handler = &proc_dointvec,
956 },
957 {
958 .ctl_name = FS_AIO_MAX_NR,
959 .procname = "aio-max-nr",
960 .data = &aio_max_nr,
961 .maxlen = sizeof(aio_max_nr),
962 .mode = 0644,
963 .proc_handler = &proc_dointvec,
964 },
965 #ifdef CONFIG_INOTIFY
966 {
967 .ctl_name = FS_INOTIFY,
968 .procname = "inotify",
969 .mode = 0555,
970 .child = inotify_table,
971 },
972 #endif
973 #endif
974 {
975 .ctl_name = KERN_SETUID_DUMPABLE,
976 .procname = "suid_dumpable",
977 .data = &suid_dumpable,
978 .maxlen = sizeof(int),
979 .mode = 0644,
980 .proc_handler = &proc_dointvec,
981 },
982 { .ctl_name = 0 }
983 };
984
985 static ctl_table debug_table[] = {
986 { .ctl_name = 0 }
987 };
988
989 static ctl_table dev_table[] = {
990 { .ctl_name = 0 }
991 };
992
993 extern void init_irq_proc (void);
994
995 void __init sysctl_init(void)
996 {
997 #ifdef CONFIG_PROC_FS
998 register_proc_table(root_table, proc_sys_root);
999 init_irq_proc();
1000 #endif
1001 }
1002
1003 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1004 void __user *newval, size_t newlen)
1005 {
1006 struct list_head *tmp;
1007
1008 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1009 return -ENOTDIR;
1010 if (oldval) {
1011 int old_len;
1012 if (!oldlenp || get_user(old_len, oldlenp))
1013 return -EFAULT;
1014 }
1015 tmp = &root_table_header.ctl_entry;
1016 do {
1017 struct ctl_table_header *head =
1018 list_entry(tmp, struct ctl_table_header, ctl_entry);
1019 void *context = NULL;
1020 int error = parse_table(name, nlen, oldval, oldlenp,
1021 newval, newlen, head->ctl_table,
1022 &context);
1023 kfree(context);
1024 if (error != -ENOTDIR)
1025 return error;
1026 tmp = tmp->next;
1027 } while (tmp != &root_table_header.ctl_entry);
1028 return -ENOTDIR;
1029 }
1030
1031 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1032 {
1033 struct __sysctl_args tmp;
1034 int error;
1035
1036 if (copy_from_user(&tmp, args, sizeof(tmp)))
1037 return -EFAULT;
1038
1039 lock_kernel();
1040 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1041 tmp.newval, tmp.newlen);
1042 unlock_kernel();
1043 return error;
1044 }
1045
1046 /*
1047 * ctl_perm does NOT grant the superuser all rights automatically, because
1048 * some sysctl variables are readonly even to root.
1049 */
1050
1051 static int test_perm(int mode, int op)
1052 {
1053 if (!current->euid)
1054 mode >>= 6;
1055 else if (in_egroup_p(0))
1056 mode >>= 3;
1057 if ((mode & op & 0007) == op)
1058 return 0;
1059 return -EACCES;
1060 }
1061
1062 static inline int ctl_perm(ctl_table *table, int op)
1063 {
1064 int error;
1065 error = security_sysctl(table, op);
1066 if (error)
1067 return error;
1068 return test_perm(table->mode, op);
1069 }
1070
1071 static int parse_table(int __user *name, int nlen,
1072 void __user *oldval, size_t __user *oldlenp,
1073 void __user *newval, size_t newlen,
1074 ctl_table *table, void **context)
1075 {
1076 int n;
1077 repeat:
1078 if (!nlen)
1079 return -ENOTDIR;
1080 if (get_user(n, name))
1081 return -EFAULT;
1082 for ( ; table->ctl_name; table++) {
1083 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1084 int error;
1085 if (table->child) {
1086 if (ctl_perm(table, 001))
1087 return -EPERM;
1088 if (table->strategy) {
1089 error = table->strategy(
1090 table, name, nlen,
1091 oldval, oldlenp,
1092 newval, newlen, context);
1093 if (error)
1094 return error;
1095 }
1096 name++;
1097 nlen--;
1098 table = table->child;
1099 goto repeat;
1100 }
1101 error = do_sysctl_strategy(table, name, nlen,
1102 oldval, oldlenp,
1103 newval, newlen, context);
1104 return error;
1105 }
1106 }
1107 return -ENOTDIR;
1108 }
1109
1110 /* Perform the actual read/write of a sysctl table entry. */
1111 int do_sysctl_strategy (ctl_table *table,
1112 int __user *name, int nlen,
1113 void __user *oldval, size_t __user *oldlenp,
1114 void __user *newval, size_t newlen, void **context)
1115 {
1116 int op = 0, rc;
1117 size_t len;
1118
1119 if (oldval)
1120 op |= 004;
1121 if (newval)
1122 op |= 002;
1123 if (ctl_perm(table, op))
1124 return -EPERM;
1125
1126 if (table->strategy) {
1127 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1128 newval, newlen, context);
1129 if (rc < 0)
1130 return rc;
1131 if (rc > 0)
1132 return 0;
1133 }
1134
1135 /* If there is no strategy routine, or if the strategy returns
1136 * zero, proceed with automatic r/w */
1137 if (table->data && table->maxlen) {
1138 if (oldval && oldlenp) {
1139 if (get_user(len, oldlenp))
1140 return -EFAULT;
1141 if (len) {
1142 if (len > table->maxlen)
1143 len = table->maxlen;
1144 if(copy_to_user(oldval, table->data, len))
1145 return -EFAULT;
1146 if(put_user(len, oldlenp))
1147 return -EFAULT;
1148 }
1149 }
1150 if (newval && newlen) {
1151 len = newlen;
1152 if (len > table->maxlen)
1153 len = table->maxlen;
1154 if(copy_from_user(table->data, newval, len))
1155 return -EFAULT;
1156 }
1157 }
1158 return 0;
1159 }
1160
1161 /**
1162 * register_sysctl_table - register a sysctl hierarchy
1163 * @table: the top-level table structure
1164 * @insert_at_head: whether the entry should be inserted in front or at the end
1165 *
1166 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1167 * array. An entry with a ctl_name of 0 terminates the table.
1168 *
1169 * The members of the &ctl_table structure are used as follows:
1170 *
1171 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1172 * must be unique within that level of sysctl
1173 *
1174 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1175 * enter a sysctl file
1176 *
1177 * data - a pointer to data for use by proc_handler
1178 *
1179 * maxlen - the maximum size in bytes of the data
1180 *
1181 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1182 *
1183 * child - a pointer to the child sysctl table if this entry is a directory, or
1184 * %NULL.
1185 *
1186 * proc_handler - the text handler routine (described below)
1187 *
1188 * strategy - the strategy routine (described below)
1189 *
1190 * de - for internal use by the sysctl routines
1191 *
1192 * extra1, extra2 - extra pointers usable by the proc handler routines
1193 *
1194 * Leaf nodes in the sysctl tree will be represented by a single file
1195 * under /proc; non-leaf nodes will be represented by directories.
1196 *
1197 * sysctl(2) can automatically manage read and write requests through
1198 * the sysctl table. The data and maxlen fields of the ctl_table
1199 * struct enable minimal validation of the values being written to be
1200 * performed, and the mode field allows minimal authentication.
1201 *
1202 * More sophisticated management can be enabled by the provision of a
1203 * strategy routine with the table entry. This will be called before
1204 * any automatic read or write of the data is performed.
1205 *
1206 * The strategy routine may return
1207 *
1208 * < 0 - Error occurred (error is passed to user process)
1209 *
1210 * 0 - OK - proceed with automatic read or write.
1211 *
1212 * > 0 - OK - read or write has been done by the strategy routine, so
1213 * return immediately.
1214 *
1215 * There must be a proc_handler routine for any terminal nodes
1216 * mirrored under /proc/sys (non-terminals are handled by a built-in
1217 * directory handler). Several default handlers are available to
1218 * cover common cases -
1219 *
1220 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1221 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1222 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1223 *
1224 * It is the handler's job to read the input buffer from user memory
1225 * and process it. The handler should return 0 on success.
1226 *
1227 * This routine returns %NULL on a failure to register, and a pointer
1228 * to the table header on success.
1229 */
1230 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1231 int insert_at_head)
1232 {
1233 struct ctl_table_header *tmp;
1234 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1235 if (!tmp)
1236 return NULL;
1237 tmp->ctl_table = table;
1238 INIT_LIST_HEAD(&tmp->ctl_entry);
1239 if (insert_at_head)
1240 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1241 else
1242 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1243 #ifdef CONFIG_PROC_FS
1244 register_proc_table(table, proc_sys_root);
1245 #endif
1246 return tmp;
1247 }
1248
1249 /**
1250 * unregister_sysctl_table - unregister a sysctl table hierarchy
1251 * @header: the header returned from register_sysctl_table
1252 *
1253 * Unregisters the sysctl table and all children. proc entries may not
1254 * actually be removed until they are no longer used by anyone.
1255 */
1256 void unregister_sysctl_table(struct ctl_table_header * header)
1257 {
1258 list_del(&header->ctl_entry);
1259 #ifdef CONFIG_PROC_FS
1260 unregister_proc_table(header->ctl_table, proc_sys_root);
1261 #endif
1262 kfree(header);
1263 }
1264
1265 /*
1266 * /proc/sys support
1267 */
1268
1269 #ifdef CONFIG_PROC_FS
1270
1271 /* Scan the sysctl entries in table and add them all into /proc */
1272 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root)
1273 {
1274 struct proc_dir_entry *de;
1275 int len;
1276 mode_t mode;
1277
1278 for (; table->ctl_name; table++) {
1279 /* Can't do anything without a proc name. */
1280 if (!table->procname)
1281 continue;
1282 /* Maybe we can't do anything with it... */
1283 if (!table->proc_handler && !table->child) {
1284 printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1285 table->procname);
1286 continue;
1287 }
1288
1289 len = strlen(table->procname);
1290 mode = table->mode;
1291
1292 de = NULL;
1293 if (table->proc_handler)
1294 mode |= S_IFREG;
1295 else {
1296 mode |= S_IFDIR;
1297 for (de = root->subdir; de; de = de->next) {
1298 if (proc_match(len, table->procname, de))
1299 break;
1300 }
1301 /* If the subdir exists already, de is non-NULL */
1302 }
1303
1304 if (!de) {
1305 de = create_proc_entry(table->procname, mode, root);
1306 if (!de)
1307 continue;
1308 de->data = (void *) table;
1309 if (table->proc_handler)
1310 de->proc_fops = &proc_sys_file_operations;
1311 }
1312 table->de = de;
1313 if (de->mode & S_IFDIR)
1314 register_proc_table(table->child, de);
1315 }
1316 }
1317
1318 /*
1319 * Unregister a /proc sysctl table and any subdirectories.
1320 */
1321 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1322 {
1323 struct proc_dir_entry *de;
1324 for (; table->ctl_name; table++) {
1325 if (!(de = table->de))
1326 continue;
1327 if (de->mode & S_IFDIR) {
1328 if (!table->child) {
1329 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1330 continue;
1331 }
1332 unregister_proc_table(table->child, de);
1333
1334 /* Don't unregister directories which still have entries.. */
1335 if (de->subdir)
1336 continue;
1337 }
1338
1339 /* Don't unregister proc entries that are still being used.. */
1340 if (atomic_read(&de->count))
1341 continue;
1342
1343 table->de = NULL;
1344 remove_proc_entry(table->procname, root);
1345 }
1346 }
1347
1348 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1349 size_t count, loff_t *ppos)
1350 {
1351 int op;
1352 struct proc_dir_entry *de;
1353 struct ctl_table *table;
1354 size_t res;
1355 ssize_t error;
1356
1357 de = PDE(file->f_dentry->d_inode);
1358 if (!de || !de->data)
1359 return -ENOTDIR;
1360 table = (struct ctl_table *) de->data;
1361 if (!table || !table->proc_handler)
1362 return -ENOTDIR;
1363 op = (write ? 002 : 004);
1364 if (ctl_perm(table, op))
1365 return -EPERM;
1366
1367 res = count;
1368
1369 error = (*table->proc_handler) (table, write, file, buf, &res, ppos);
1370 if (error)
1371 return error;
1372 return res;
1373 }
1374
1375 static int proc_opensys(struct inode *inode, struct file *file)
1376 {
1377 if (file->f_mode & FMODE_WRITE) {
1378 /*
1379 * sysctl entries that are not writable,
1380 * are _NOT_ writable, capabilities or not.
1381 */
1382 if (!(inode->i_mode & S_IWUSR))
1383 return -EPERM;
1384 }
1385
1386 return 0;
1387 }
1388
1389 static ssize_t proc_readsys(struct file * file, char __user * buf,
1390 size_t count, loff_t *ppos)
1391 {
1392 return do_rw_proc(0, file, buf, count, ppos);
1393 }
1394
1395 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1396 size_t count, loff_t *ppos)
1397 {
1398 return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1399 }
1400
1401 /**
1402 * proc_dostring - read a string sysctl
1403 * @table: the sysctl table
1404 * @write: %TRUE if this is a write to the sysctl file
1405 * @filp: the file structure
1406 * @buffer: the user buffer
1407 * @lenp: the size of the user buffer
1408 * @ppos: file position
1409 *
1410 * Reads/writes a string from/to the user buffer. If the kernel
1411 * buffer provided is not large enough to hold the string, the
1412 * string is truncated. The copied string is %NULL-terminated.
1413 * If the string is being read by the user process, it is copied
1414 * and a newline '\n' is added. It is truncated if the buffer is
1415 * not large enough.
1416 *
1417 * Returns 0 on success.
1418 */
1419 int proc_dostring(ctl_table *table, int write, struct file *filp,
1420 void __user *buffer, size_t *lenp, loff_t *ppos)
1421 {
1422 size_t len;
1423 char __user *p;
1424 char c;
1425
1426 if (!table->data || !table->maxlen || !*lenp ||
1427 (*ppos && !write)) {
1428 *lenp = 0;
1429 return 0;
1430 }
1431
1432 if (write) {
1433 len = 0;
1434 p = buffer;
1435 while (len < *lenp) {
1436 if (get_user(c, p++))
1437 return -EFAULT;
1438 if (c == 0 || c == '\n')
1439 break;
1440 len++;
1441 }
1442 if (len >= table->maxlen)
1443 len = table->maxlen-1;
1444 if(copy_from_user(table->data, buffer, len))
1445 return -EFAULT;
1446 ((char *) table->data)[len] = 0;
1447 *ppos += *lenp;
1448 } else {
1449 len = strlen(table->data);
1450 if (len > table->maxlen)
1451 len = table->maxlen;
1452 if (len > *lenp)
1453 len = *lenp;
1454 if (len)
1455 if(copy_to_user(buffer, table->data, len))
1456 return -EFAULT;
1457 if (len < *lenp) {
1458 if(put_user('\n', ((char __user *) buffer) + len))
1459 return -EFAULT;
1460 len++;
1461 }
1462 *lenp = len;
1463 *ppos += len;
1464 }
1465 return 0;
1466 }
1467
1468 /*
1469 * Special case of dostring for the UTS structure. This has locks
1470 * to observe. Should this be in kernel/sys.c ????
1471 */
1472
1473 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1474 void __user *buffer, size_t *lenp, loff_t *ppos)
1475 {
1476 int r;
1477
1478 if (!write) {
1479 down_read(&uts_sem);
1480 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1481 up_read(&uts_sem);
1482 } else {
1483 down_write(&uts_sem);
1484 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1485 up_write(&uts_sem);
1486 }
1487 return r;
1488 }
1489
1490 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1491 int *valp,
1492 int write, void *data)
1493 {
1494 if (write) {
1495 *valp = *negp ? -*lvalp : *lvalp;
1496 } else {
1497 int val = *valp;
1498 if (val < 0) {
1499 *negp = -1;
1500 *lvalp = (unsigned long)-val;
1501 } else {
1502 *negp = 0;
1503 *lvalp = (unsigned long)val;
1504 }
1505 }
1506 return 0;
1507 }
1508
1509 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1510 void __user *buffer, size_t *lenp, loff_t *ppos,
1511 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1512 int write, void *data),
1513 void *data)
1514 {
1515 #define TMPBUFLEN 21
1516 int *i, vleft, first=1, neg, val;
1517 unsigned long lval;
1518 size_t left, len;
1519
1520 char buf[TMPBUFLEN], *p;
1521 char __user *s = buffer;
1522
1523 if (!table->data || !table->maxlen || !*lenp ||
1524 (*ppos && !write)) {
1525 *lenp = 0;
1526 return 0;
1527 }
1528
1529 i = (int *) table->data;
1530 vleft = table->maxlen / sizeof(*i);
1531 left = *lenp;
1532
1533 if (!conv)
1534 conv = do_proc_dointvec_conv;
1535
1536 for (; left && vleft--; i++, first=0) {
1537 if (write) {
1538 while (left) {
1539 char c;
1540 if (get_user(c, s))
1541 return -EFAULT;
1542 if (!isspace(c))
1543 break;
1544 left--;
1545 s++;
1546 }
1547 if (!left)
1548 break;
1549 neg = 0;
1550 len = left;
1551 if (len > sizeof(buf) - 1)
1552 len = sizeof(buf) - 1;
1553 if (copy_from_user(buf, s, len))
1554 return -EFAULT;
1555 buf[len] = 0;
1556 p = buf;
1557 if (*p == '-' && left > 1) {
1558 neg = 1;
1559 left--, p++;
1560 }
1561 if (*p < '0' || *p > '9')
1562 break;
1563
1564 lval = simple_strtoul(p, &p, 0);
1565
1566 len = p-buf;
1567 if ((len < left) && *p && !isspace(*p))
1568 break;
1569 if (neg)
1570 val = -val;
1571 s += len;
1572 left -= len;
1573
1574 if (conv(&neg, &lval, i, 1, data))
1575 break;
1576 } else {
1577 p = buf;
1578 if (!first)
1579 *p++ = '\t';
1580
1581 if (conv(&neg, &lval, i, 0, data))
1582 break;
1583
1584 sprintf(p, "%s%lu", neg ? "-" : "", lval);
1585 len = strlen(buf);
1586 if (len > left)
1587 len = left;
1588 if(copy_to_user(s, buf, len))
1589 return -EFAULT;
1590 left -= len;
1591 s += len;
1592 }
1593 }
1594
1595 if (!write && !first && left) {
1596 if(put_user('\n', s))
1597 return -EFAULT;
1598 left--, s++;
1599 }
1600 if (write) {
1601 while (left) {
1602 char c;
1603 if (get_user(c, s++))
1604 return -EFAULT;
1605 if (!isspace(c))
1606 break;
1607 left--;
1608 }
1609 }
1610 if (write && first)
1611 return -EINVAL;
1612 *lenp -= left;
1613 *ppos += *lenp;
1614 return 0;
1615 #undef TMPBUFLEN
1616 }
1617
1618 /**
1619 * proc_dointvec - read a vector of integers
1620 * @table: the sysctl table
1621 * @write: %TRUE if this is a write to the sysctl file
1622 * @filp: the file structure
1623 * @buffer: the user buffer
1624 * @lenp: the size of the user buffer
1625 * @ppos: file position
1626 *
1627 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1628 * values from/to the user buffer, treated as an ASCII string.
1629 *
1630 * Returns 0 on success.
1631 */
1632 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1633 void __user *buffer, size_t *lenp, loff_t *ppos)
1634 {
1635 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1636 NULL,NULL);
1637 }
1638
1639 #define OP_SET 0
1640 #define OP_AND 1
1641 #define OP_OR 2
1642 #define OP_MAX 3
1643 #define OP_MIN 4
1644
1645 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1646 int *valp,
1647 int write, void *data)
1648 {
1649 int op = *(int *)data;
1650 if (write) {
1651 int val = *negp ? -*lvalp : *lvalp;
1652 switch(op) {
1653 case OP_SET: *valp = val; break;
1654 case OP_AND: *valp &= val; break;
1655 case OP_OR: *valp |= val; break;
1656 case OP_MAX: if(*valp < val)
1657 *valp = val;
1658 break;
1659 case OP_MIN: if(*valp > val)
1660 *valp = val;
1661 break;
1662 }
1663 } else {
1664 int val = *valp;
1665 if (val < 0) {
1666 *negp = -1;
1667 *lvalp = (unsigned long)-val;
1668 } else {
1669 *negp = 0;
1670 *lvalp = (unsigned long)val;
1671 }
1672 }
1673 return 0;
1674 }
1675
1676 /*
1677 * init may raise the set.
1678 */
1679
1680 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1681 void __user *buffer, size_t *lenp, loff_t *ppos)
1682 {
1683 int op;
1684
1685 if (!capable(CAP_SYS_MODULE)) {
1686 return -EPERM;
1687 }
1688
1689 op = (current->pid == 1) ? OP_SET : OP_AND;
1690 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1691 do_proc_dointvec_bset_conv,&op);
1692 }
1693
1694 struct do_proc_dointvec_minmax_conv_param {
1695 int *min;
1696 int *max;
1697 };
1698
1699 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1700 int *valp,
1701 int write, void *data)
1702 {
1703 struct do_proc_dointvec_minmax_conv_param *param = data;
1704 if (write) {
1705 int val = *negp ? -*lvalp : *lvalp;
1706 if ((param->min && *param->min > val) ||
1707 (param->max && *param->max < val))
1708 return -EINVAL;
1709 *valp = val;
1710 } else {
1711 int val = *valp;
1712 if (val < 0) {
1713 *negp = -1;
1714 *lvalp = (unsigned long)-val;
1715 } else {
1716 *negp = 0;
1717 *lvalp = (unsigned long)val;
1718 }
1719 }
1720 return 0;
1721 }
1722
1723 /**
1724 * proc_dointvec_minmax - read a vector of integers with min/max values
1725 * @table: the sysctl table
1726 * @write: %TRUE if this is a write to the sysctl file
1727 * @filp: the file structure
1728 * @buffer: the user buffer
1729 * @lenp: the size of the user buffer
1730 * @ppos: file position
1731 *
1732 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1733 * values from/to the user buffer, treated as an ASCII string.
1734 *
1735 * This routine will ensure the values are within the range specified by
1736 * table->extra1 (min) and table->extra2 (max).
1737 *
1738 * Returns 0 on success.
1739 */
1740 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1741 void __user *buffer, size_t *lenp, loff_t *ppos)
1742 {
1743 struct do_proc_dointvec_minmax_conv_param param = {
1744 .min = (int *) table->extra1,
1745 .max = (int *) table->extra2,
1746 };
1747 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1748 do_proc_dointvec_minmax_conv, &param);
1749 }
1750
1751 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1752 struct file *filp,
1753 void __user *buffer,
1754 size_t *lenp, loff_t *ppos,
1755 unsigned long convmul,
1756 unsigned long convdiv)
1757 {
1758 #define TMPBUFLEN 21
1759 unsigned long *i, *min, *max, val;
1760 int vleft, first=1, neg;
1761 size_t len, left;
1762 char buf[TMPBUFLEN], *p;
1763 char __user *s = buffer;
1764
1765 if (!table->data || !table->maxlen || !*lenp ||
1766 (*ppos && !write)) {
1767 *lenp = 0;
1768 return 0;
1769 }
1770
1771 i = (unsigned long *) table->data;
1772 min = (unsigned long *) table->extra1;
1773 max = (unsigned long *) table->extra2;
1774 vleft = table->maxlen / sizeof(unsigned long);
1775 left = *lenp;
1776
1777 for (; left && vleft--; i++, min++, max++, first=0) {
1778 if (write) {
1779 while (left) {
1780 char c;
1781 if (get_user(c, s))
1782 return -EFAULT;
1783 if (!isspace(c))
1784 break;
1785 left--;
1786 s++;
1787 }
1788 if (!left)
1789 break;
1790 neg = 0;
1791 len = left;
1792 if (len > TMPBUFLEN-1)
1793 len = TMPBUFLEN-1;
1794 if (copy_from_user(buf, s, len))
1795 return -EFAULT;
1796 buf[len] = 0;
1797 p = buf;
1798 if (*p == '-' && left > 1) {
1799 neg = 1;
1800 left--, p++;
1801 }
1802 if (*p < '0' || *p > '9')
1803 break;
1804 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1805 len = p-buf;
1806 if ((len < left) && *p && !isspace(*p))
1807 break;
1808 if (neg)
1809 val = -val;
1810 s += len;
1811 left -= len;
1812
1813 if(neg)
1814 continue;
1815 if ((min && val < *min) || (max && val > *max))
1816 continue;
1817 *i = val;
1818 } else {
1819 p = buf;
1820 if (!first)
1821 *p++ = '\t';
1822 sprintf(p, "%lu", convdiv * (*i) / convmul);
1823 len = strlen(buf);
1824 if (len > left)
1825 len = left;
1826 if(copy_to_user(s, buf, len))
1827 return -EFAULT;
1828 left -= len;
1829 s += len;
1830 }
1831 }
1832
1833 if (!write && !first && left) {
1834 if(put_user('\n', s))
1835 return -EFAULT;
1836 left--, s++;
1837 }
1838 if (write) {
1839 while (left) {
1840 char c;
1841 if (get_user(c, s++))
1842 return -EFAULT;
1843 if (!isspace(c))
1844 break;
1845 left--;
1846 }
1847 }
1848 if (write && first)
1849 return -EINVAL;
1850 *lenp -= left;
1851 *ppos += *lenp;
1852 return 0;
1853 #undef TMPBUFLEN
1854 }
1855
1856 /**
1857 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1858 * @table: the sysctl table
1859 * @write: %TRUE if this is a write to the sysctl file
1860 * @filp: the file structure
1861 * @buffer: the user buffer
1862 * @lenp: the size of the user buffer
1863 * @ppos: file position
1864 *
1865 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1866 * values from/to the user buffer, treated as an ASCII string.
1867 *
1868 * This routine will ensure the values are within the range specified by
1869 * table->extra1 (min) and table->extra2 (max).
1870 *
1871 * Returns 0 on success.
1872 */
1873 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
1874 void __user *buffer, size_t *lenp, loff_t *ppos)
1875 {
1876 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
1877 }
1878
1879 /**
1880 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1881 * @table: the sysctl table
1882 * @write: %TRUE if this is a write to the sysctl file
1883 * @filp: the file structure
1884 * @buffer: the user buffer
1885 * @lenp: the size of the user buffer
1886 * @ppos: file position
1887 *
1888 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1889 * values from/to the user buffer, treated as an ASCII string. The values
1890 * are treated as milliseconds, and converted to jiffies when they are stored.
1891 *
1892 * This routine will ensure the values are within the range specified by
1893 * table->extra1 (min) and table->extra2 (max).
1894 *
1895 * Returns 0 on success.
1896 */
1897 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
1898 struct file *filp,
1899 void __user *buffer,
1900 size_t *lenp, loff_t *ppos)
1901 {
1902 return do_proc_doulongvec_minmax(table, write, filp, buffer,
1903 lenp, ppos, HZ, 1000l);
1904 }
1905
1906
1907 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
1908 int *valp,
1909 int write, void *data)
1910 {
1911 if (write) {
1912 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1913 } else {
1914 int val = *valp;
1915 unsigned long lval;
1916 if (val < 0) {
1917 *negp = -1;
1918 lval = (unsigned long)-val;
1919 } else {
1920 *negp = 0;
1921 lval = (unsigned long)val;
1922 }
1923 *lvalp = lval / HZ;
1924 }
1925 return 0;
1926 }
1927
1928 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
1929 int *valp,
1930 int write, void *data)
1931 {
1932 if (write) {
1933 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1934 } else {
1935 int val = *valp;
1936 unsigned long lval;
1937 if (val < 0) {
1938 *negp = -1;
1939 lval = (unsigned long)-val;
1940 } else {
1941 *negp = 0;
1942 lval = (unsigned long)val;
1943 }
1944 *lvalp = jiffies_to_clock_t(lval);
1945 }
1946 return 0;
1947 }
1948
1949 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
1950 int *valp,
1951 int write, void *data)
1952 {
1953 if (write) {
1954 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1955 } else {
1956 int val = *valp;
1957 unsigned long lval;
1958 if (val < 0) {
1959 *negp = -1;
1960 lval = (unsigned long)-val;
1961 } else {
1962 *negp = 0;
1963 lval = (unsigned long)val;
1964 }
1965 *lvalp = jiffies_to_msecs(lval);
1966 }
1967 return 0;
1968 }
1969
1970 /**
1971 * proc_dointvec_jiffies - read a vector of integers as seconds
1972 * @table: the sysctl table
1973 * @write: %TRUE if this is a write to the sysctl file
1974 * @filp: the file structure
1975 * @buffer: the user buffer
1976 * @lenp: the size of the user buffer
1977 * @ppos: file position
1978 *
1979 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1980 * values from/to the user buffer, treated as an ASCII string.
1981 * The values read are assumed to be in seconds, and are converted into
1982 * jiffies.
1983 *
1984 * Returns 0 on success.
1985 */
1986 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
1987 void __user *buffer, size_t *lenp, loff_t *ppos)
1988 {
1989 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1990 do_proc_dointvec_jiffies_conv,NULL);
1991 }
1992
1993 /**
1994 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1995 * @table: the sysctl table
1996 * @write: %TRUE if this is a write to the sysctl file
1997 * @filp: the file structure
1998 * @buffer: the user buffer
1999 * @lenp: the size of the user buffer
2000 *
2001 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2002 * values from/to the user buffer, treated as an ASCII string.
2003 * The values read are assumed to be in 1/USER_HZ seconds, and
2004 * are converted into jiffies.
2005 *
2006 * Returns 0 on success.
2007 */
2008 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2009 void __user *buffer, size_t *lenp, loff_t *ppos)
2010 {
2011 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2012 do_proc_dointvec_userhz_jiffies_conv,NULL);
2013 }
2014
2015 /**
2016 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2017 * @table: the sysctl table
2018 * @write: %TRUE if this is a write to the sysctl file
2019 * @filp: the file structure
2020 * @buffer: the user buffer
2021 * @lenp: the size of the user buffer
2022 * @ppos: file position
2023 * @ppos: the current position in the file
2024 *
2025 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2026 * values from/to the user buffer, treated as an ASCII string.
2027 * The values read are assumed to be in 1/1000 seconds, and
2028 * are converted into jiffies.
2029 *
2030 * Returns 0 on success.
2031 */
2032 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2033 void __user *buffer, size_t *lenp, loff_t *ppos)
2034 {
2035 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2036 do_proc_dointvec_ms_jiffies_conv, NULL);
2037 }
2038
2039 #else /* CONFIG_PROC_FS */
2040
2041 int proc_dostring(ctl_table *table, int write, struct file *filp,
2042 void __user *buffer, size_t *lenp, loff_t *ppos)
2043 {
2044 return -ENOSYS;
2045 }
2046
2047 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2048 void __user *buffer, size_t *lenp, loff_t *ppos)
2049 {
2050 return -ENOSYS;
2051 }
2052
2053 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2054 void __user *buffer, size_t *lenp, loff_t *ppos)
2055 {
2056 return -ENOSYS;
2057 }
2058
2059 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2060 void __user *buffer, size_t *lenp, loff_t *ppos)
2061 {
2062 return -ENOSYS;
2063 }
2064
2065 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2066 void __user *buffer, size_t *lenp, loff_t *ppos)
2067 {
2068 return -ENOSYS;
2069 }
2070
2071 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2072 void __user *buffer, size_t *lenp, loff_t *ppos)
2073 {
2074 return -ENOSYS;
2075 }
2076
2077 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2078 void __user *buffer, size_t *lenp, loff_t *ppos)
2079 {
2080 return -ENOSYS;
2081 }
2082
2083 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2084 void __user *buffer, size_t *lenp, loff_t *ppos)
2085 {
2086 return -ENOSYS;
2087 }
2088
2089 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2090 void __user *buffer, size_t *lenp, loff_t *ppos)
2091 {
2092 return -ENOSYS;
2093 }
2094
2095 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2096 struct file *filp,
2097 void __user *buffer,
2098 size_t *lenp, loff_t *ppos)
2099 {
2100 return -ENOSYS;
2101 }
2102
2103
2104 #endif /* CONFIG_PROC_FS */
2105
2106
2107 /*
2108 * General sysctl support routines
2109 */
2110
2111 /* The generic string strategy routine: */
2112 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2113 void __user *oldval, size_t __user *oldlenp,
2114 void __user *newval, size_t newlen, void **context)
2115 {
2116 size_t l, len;
2117
2118 if (!table->data || !table->maxlen)
2119 return -ENOTDIR;
2120
2121 if (oldval && oldlenp) {
2122 if (get_user(len, oldlenp))
2123 return -EFAULT;
2124 if (len) {
2125 l = strlen(table->data);
2126 if (len > l) len = l;
2127 if (len >= table->maxlen)
2128 len = table->maxlen;
2129 if(copy_to_user(oldval, table->data, len))
2130 return -EFAULT;
2131 if(put_user(0, ((char __user *) oldval) + len))
2132 return -EFAULT;
2133 if(put_user(len, oldlenp))
2134 return -EFAULT;
2135 }
2136 }
2137 if (newval && newlen) {
2138 len = newlen;
2139 if (len > table->maxlen)
2140 len = table->maxlen;
2141 if(copy_from_user(table->data, newval, len))
2142 return -EFAULT;
2143 if (len == table->maxlen)
2144 len--;
2145 ((char *) table->data)[len] = 0;
2146 }
2147 return 0;
2148 }
2149
2150 /*
2151 * This function makes sure that all of the integers in the vector
2152 * are between the minimum and maximum values given in the arrays
2153 * table->extra1 and table->extra2, respectively.
2154 */
2155 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2156 void __user *oldval, size_t __user *oldlenp,
2157 void __user *newval, size_t newlen, void **context)
2158 {
2159
2160 if (newval && newlen) {
2161 int __user *vec = (int __user *) newval;
2162 int *min = (int *) table->extra1;
2163 int *max = (int *) table->extra2;
2164 size_t length;
2165 int i;
2166
2167 if (newlen % sizeof(int) != 0)
2168 return -EINVAL;
2169
2170 if (!table->extra1 && !table->extra2)
2171 return 0;
2172
2173 if (newlen > table->maxlen)
2174 newlen = table->maxlen;
2175 length = newlen / sizeof(int);
2176
2177 for (i = 0; i < length; i++) {
2178 int value;
2179 if (get_user(value, vec + i))
2180 return -EFAULT;
2181 if (min && value < min[i])
2182 return -EINVAL;
2183 if (max && value > max[i])
2184 return -EINVAL;
2185 }
2186 }
2187 return 0;
2188 }
2189
2190 /* Strategy function to convert jiffies to seconds */
2191 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2192 void __user *oldval, size_t __user *oldlenp,
2193 void __user *newval, size_t newlen, void **context)
2194 {
2195 if (oldval) {
2196 size_t olen;
2197 if (oldlenp) {
2198 if (get_user(olen, oldlenp))
2199 return -EFAULT;
2200 if (olen!=sizeof(int))
2201 return -EINVAL;
2202 }
2203 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2204 (oldlenp && put_user(sizeof(int),oldlenp)))
2205 return -EFAULT;
2206 }
2207 if (newval && newlen) {
2208 int new;
2209 if (newlen != sizeof(int))
2210 return -EINVAL;
2211 if (get_user(new, (int __user *)newval))
2212 return -EFAULT;
2213 *(int *)(table->data) = new*HZ;
2214 }
2215 return 1;
2216 }
2217
2218 /* Strategy function to convert jiffies to seconds */
2219 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2220 void __user *oldval, size_t __user *oldlenp,
2221 void __user *newval, size_t newlen, void **context)
2222 {
2223 if (oldval) {
2224 size_t olen;
2225 if (oldlenp) {
2226 if (get_user(olen, oldlenp))
2227 return -EFAULT;
2228 if (olen!=sizeof(int))
2229 return -EINVAL;
2230 }
2231 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2232 (oldlenp && put_user(sizeof(int),oldlenp)))
2233 return -EFAULT;
2234 }
2235 if (newval && newlen) {
2236 int new;
2237 if (newlen != sizeof(int))
2238 return -EINVAL;
2239 if (get_user(new, (int __user *)newval))
2240 return -EFAULT;
2241 *(int *)(table->data) = msecs_to_jiffies(new);
2242 }
2243 return 1;
2244 }
2245
2246 #else /* CONFIG_SYSCTL */
2247
2248
2249 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2250 {
2251 return -ENOSYS;
2252 }
2253
2254 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2255 void __user *oldval, size_t __user *oldlenp,
2256 void __user *newval, size_t newlen, void **context)
2257 {
2258 return -ENOSYS;
2259 }
2260
2261 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2262 void __user *oldval, size_t __user *oldlenp,
2263 void __user *newval, size_t newlen, void **context)
2264 {
2265 return -ENOSYS;
2266 }
2267
2268 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2269 void __user *oldval, size_t __user *oldlenp,
2270 void __user *newval, size_t newlen, void **context)
2271 {
2272 return -ENOSYS;
2273 }
2274
2275 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2276 void __user *oldval, size_t __user *oldlenp,
2277 void __user *newval, size_t newlen, void **context)
2278 {
2279 return -ENOSYS;
2280 }
2281
2282 int proc_dostring(ctl_table *table, int write, struct file *filp,
2283 void __user *buffer, size_t *lenp, loff_t *ppos)
2284 {
2285 return -ENOSYS;
2286 }
2287
2288 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2289 void __user *buffer, size_t *lenp, loff_t *ppos)
2290 {
2291 return -ENOSYS;
2292 }
2293
2294 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2295 void __user *buffer, size_t *lenp, loff_t *ppos)
2296 {
2297 return -ENOSYS;
2298 }
2299
2300 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2301 void __user *buffer, size_t *lenp, loff_t *ppos)
2302 {
2303 return -ENOSYS;
2304 }
2305
2306 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2307 void __user *buffer, size_t *lenp, loff_t *ppos)
2308 {
2309 return -ENOSYS;
2310 }
2311
2312 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2313 void __user *buffer, size_t *lenp, loff_t *ppos)
2314 {
2315 return -ENOSYS;
2316 }
2317
2318 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2319 void __user *buffer, size_t *lenp, loff_t *ppos)
2320 {
2321 return -ENOSYS;
2322 }
2323
2324 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2325 void __user *buffer, size_t *lenp, loff_t *ppos)
2326 {
2327 return -ENOSYS;
2328 }
2329
2330 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2331 struct file *filp,
2332 void __user *buffer,
2333 size_t *lenp, loff_t *ppos)
2334 {
2335 return -ENOSYS;
2336 }
2337
2338 struct ctl_table_header * register_sysctl_table(ctl_table * table,
2339 int insert_at_head)
2340 {
2341 return NULL;
2342 }
2343
2344 void unregister_sysctl_table(struct ctl_table_header * table)
2345 {
2346 }
2347
2348 #endif /* CONFIG_SYSCTL */
2349
2350 /*
2351 * No sense putting this after each symbol definition, twice,
2352 * exception granted :-)
2353 */
2354 EXPORT_SYMBOL(proc_dointvec);
2355 EXPORT_SYMBOL(proc_dointvec_jiffies);
2356 EXPORT_SYMBOL(proc_dointvec_minmax);
2357 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2358 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2359 EXPORT_SYMBOL(proc_dostring);
2360 EXPORT_SYMBOL(proc_doulongvec_minmax);
2361 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2362 EXPORT_SYMBOL(register_sysctl_table);
2363 EXPORT_SYMBOL(sysctl_intvec);
2364 EXPORT_SYMBOL(sysctl_jiffies);
2365 EXPORT_SYMBOL(sysctl_ms_jiffies);
2366 EXPORT_SYMBOL(sysctl_string);
2367 EXPORT_SYMBOL(unregister_sysctl_table);
Support for the Chinese Samsung S3C2440 based development boards