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[PATCH] cpu hotplug documentation fix
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / sysctl.c
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1da177e4
LT		 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>
c59ede7b 28#include <linux/capability.h>
1da177e4
LT		 29#include <linux/ctype.h>
30#include <linux/utsname.h>
31#include <linux/capability.h>
32#include <linux/smp_lock.h>
33#include <linux/init.h>
34#include <linux/kernel.h>
0296b228 35#include <linux/kobject.h>
20380731 36#include <linux/net.h>
1da177e4
LT		 37#include <linux/sysrq.h>
38#include <linux/highuid.h>
39#include <linux/writeback.h>
40#include <linux/hugetlb.h>
41#include <linux/security.h>
42#include <linux/initrd.h>
43#include <linux/times.h>
44#include <linux/limits.h>
45#include <linux/dcache.h>
46#include <linux/syscalls.h>
47
48#include <asm/uaccess.h>
49#include <asm/processor.h>
50
51#ifdef CONFIG_ROOT_NFS
52#include <linux/nfs_fs.h>
53#endif
54
55#if defined(CONFIG_SYSCTL)
56
57/* External variables not in a header file. */
58extern int C_A_D;
59extern int sysctl_overcommit_memory;
60extern int sysctl_overcommit_ratio;
61extern int max_threads;
62extern int sysrq_enabled;
63extern int core_uses_pid;
d6e71144 64extern int suid_dumpable;
1da177e4
LT		 65extern char core_pattern[];
66extern int cad_pid;
67extern int pid_max;
68extern int min_free_kbytes;
69extern int printk_ratelimit_jiffies;
70extern int printk_ratelimit_burst;
71extern int pid_max_min, pid_max_max;
9d0243bc 72extern int sysctl_drop_caches;
8ad4b1fb 73extern int percpu_pagelist_fraction;
1da177e4
LT		 74
75#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
76int unknown_nmi_panic;
77extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
78 void __user *, size_t *, loff_t *);
79#endif
80
81/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
82static int maxolduid = 65535;
83static int minolduid;
8ad4b1fb 84static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 85
86static int ngroups_max = NGROUPS_MAX;
87
88#ifdef CONFIG_KMOD
89extern char modprobe_path[];
90#endif
1da177e4
LT		 91#ifdef CONFIG_CHR_DEV_SG
92extern int sg_big_buff;
93#endif
94#ifdef CONFIG_SYSVIPC
95extern size_t shm_ctlmax;
96extern size_t shm_ctlall;
97extern int shm_ctlmni;
98extern int msg_ctlmax;
99extern int msg_ctlmnb;
100extern int msg_ctlmni;
101extern int sem_ctls[];
102#endif
103
104#ifdef __sparc__
105extern char reboot_command [];
106extern int stop_a_enabled;
107extern int scons_pwroff;
108#endif
109
110#ifdef __hppa__
111extern int pwrsw_enabled;
112extern int unaligned_enabled;
113#endif
114
347a8dc3 115#ifdef CONFIG_S390
1da177e4
LT		 116#ifdef CONFIG_MATHEMU
117extern int sysctl_ieee_emulation_warnings;
118#endif
119extern int sysctl_userprocess_debug;
951f22d5 120extern int spin_retry;
1da177e4
LT		 121#endif
122
123extern int sysctl_hz_timer;
124
125#ifdef CONFIG_BSD_PROCESS_ACCT
126extern int acct_parm[];
127#endif
128
1da177e4
LT		 129static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
130 ctl_table *, void **);
131static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
132 void __user *buffer, size_t *lenp, loff_t *ppos);
133
134static ctl_table root_table[];
135static struct ctl_table_header root_table_header =
136 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
137
138static ctl_table kern_table[];
139static ctl_table vm_table[];
1da177e4
LT		 140static ctl_table proc_table[];
141static ctl_table fs_table[];
142static ctl_table debug_table[];
143static ctl_table dev_table[];
144extern ctl_table random_table[];
145#ifdef CONFIG_UNIX98_PTYS
146extern ctl_table pty_table[];
147#endif
0399cb08
RL		 148#ifdef CONFIG_INOTIFY
149extern ctl_table inotify_table[];
150#endif
1da177e4
LT		 151
152#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
153int sysctl_legacy_va_layout;
154#endif
155
156/* /proc declarations: */
157
158#ifdef CONFIG_PROC_FS
159
160static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
161static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
162static int proc_opensys(struct inode *, struct file *);
163
164struct file_operations proc_sys_file_operations = {
165 .open = proc_opensys,
166 .read = proc_readsys,
167 .write = proc_writesys,
168};
169
170extern struct proc_dir_entry *proc_sys_root;
171
330d57fb 172static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *);
1da177e4
LT		 173static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
174#endif
175
176/* The default sysctl tables: */
177
178static 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 },
0eeca283 223
1da177e4
LT		 224 { .ctl_name = 0 }
225};
226
227static 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",
312c004d
KS		 400 .data = &uevent_helper,
401 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 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 },
347a8dc3 547#ifdef CONFIG_S390
1da177e4
LT		 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 },
0152fb37 649#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 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
1da177e4
LT		 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. */
664static int zero;
665static int one_hundred = 100;
666
667
668static 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 },
9d0243bc
AM		 779 {
780 .ctl_name = VM_DROP_PAGECACHE,
781 .procname = "drop_caches",
782 .data = &sysctl_drop_caches,
783 .maxlen = sizeof(int),
784 .mode = 0644,
785 .proc_handler = drop_caches_sysctl_handler,
786 .strategy = &sysctl_intvec,
787 },
1da177e4
LT		 788 {
789 .ctl_name = VM_MIN_FREE_KBYTES,
790 .procname = "min_free_kbytes",
791 .data = &min_free_kbytes,
792 .maxlen = sizeof(min_free_kbytes),
793 .mode = 0644,
794 .proc_handler = &min_free_kbytes_sysctl_handler,
795 .strategy = &sysctl_intvec,
796 .extra1 = &zero,
797 },
8ad4b1fb
RS		 798 {
799 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
800 .procname = "percpu_pagelist_fraction",
801 .data = &percpu_pagelist_fraction,
802 .maxlen = sizeof(percpu_pagelist_fraction),
803 .mode = 0644,
804 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
805 .strategy = &sysctl_intvec,
806 .extra1 = &min_percpu_pagelist_fract,
807 },
1da177e4
LT		 808#ifdef CONFIG_MMU
809 {
810 .ctl_name = VM_MAX_MAP_COUNT,
811 .procname = "max_map_count",
812 .data = &sysctl_max_map_count,
813 .maxlen = sizeof(sysctl_max_map_count),
814 .mode = 0644,
815 .proc_handler = &proc_dointvec
816 },
817#endif
818 {
819 .ctl_name = VM_LAPTOP_MODE,
820 .procname = "laptop_mode",
821 .data = &laptop_mode,
822 .maxlen = sizeof(laptop_mode),
823 .mode = 0644,
824 .proc_handler = &proc_dointvec,
825 .strategy = &sysctl_intvec,
826 .extra1 = &zero,
827 },
828 {
829 .ctl_name = VM_BLOCK_DUMP,
830 .procname = "block_dump",
831 .data = &block_dump,
832 .maxlen = sizeof(block_dump),
833 .mode = 0644,
834 .proc_handler = &proc_dointvec,
835 .strategy = &sysctl_intvec,
836 .extra1 = &zero,
837 },
838 {
839 .ctl_name = VM_VFS_CACHE_PRESSURE,
840 .procname = "vfs_cache_pressure",
841 .data = &sysctl_vfs_cache_pressure,
842 .maxlen = sizeof(sysctl_vfs_cache_pressure),
843 .mode = 0644,
844 .proc_handler = &proc_dointvec,
845 .strategy = &sysctl_intvec,
846 .extra1 = &zero,
847 },
848#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
849 {
850 .ctl_name = VM_LEGACY_VA_LAYOUT,
851 .procname = "legacy_va_layout",
852 .data = &sysctl_legacy_va_layout,
853 .maxlen = sizeof(sysctl_legacy_va_layout),
854 .mode = 0644,
855 .proc_handler = &proc_dointvec,
856 .strategy = &sysctl_intvec,
857 .extra1 = &zero,
858 },
859#endif
860#ifdef CONFIG_SWAP
861 {
862 .ctl_name = VM_SWAP_TOKEN_TIMEOUT,
863 .procname = "swap_token_timeout",
864 .data = &swap_token_default_timeout,
865 .maxlen = sizeof(swap_token_default_timeout),
866 .mode = 0644,
867 .proc_handler = &proc_dointvec_jiffies,
868 .strategy = &sysctl_jiffies,
869 },
1743660b
CL		 870#endif
871#ifdef CONFIG_NUMA
872 {
873 .ctl_name = VM_ZONE_RECLAIM_MODE,
874 .procname = "zone_reclaim_mode",
875 .data = &zone_reclaim_mode,
876 .maxlen = sizeof(zone_reclaim_mode),
877 .mode = 0644,
878 .proc_handler = &proc_dointvec,
c84db23c
CL		 879 .strategy = &sysctl_intvec,
880 .extra1 = &zero,
1743660b 881 },
2a11ff06
CL		 882 {
883 .ctl_name = VM_ZONE_RECLAIM_INTERVAL,
884 .procname = "zone_reclaim_interval",
885 .data = &zone_reclaim_interval,
886 .maxlen = sizeof(zone_reclaim_interval),
887 .mode = 0644,
888 .proc_handler = &proc_dointvec_jiffies,
889 .strategy = &sysctl_jiffies,
890 },
1da177e4
LT		 891#endif
892 { .ctl_name = 0 }
893};
894
895static ctl_table proc_table[] = {
896 { .ctl_name = 0 }
897};
898
899static ctl_table fs_table[] = {
900 {
901 .ctl_name = FS_NRINODE,
902 .procname = "inode-nr",
903 .data = &inodes_stat,
904 .maxlen = 2*sizeof(int),
905 .mode = 0444,
906 .proc_handler = &proc_dointvec,
907 },
908 {
909 .ctl_name = FS_STATINODE,
910 .procname = "inode-state",
911 .data = &inodes_stat,
912 .maxlen = 7*sizeof(int),
913 .mode = 0444,
914 .proc_handler = &proc_dointvec,
915 },
916 {
917 .ctl_name = FS_NRFILE,
918 .procname = "file-nr",
919 .data = &files_stat,
920 .maxlen = 3*sizeof(int),
921 .mode = 0444,
922 .proc_handler = &proc_dointvec,
923 },
924 {
925 .ctl_name = FS_MAXFILE,
926 .procname = "file-max",
927 .data = &files_stat.max_files,
928 .maxlen = sizeof(int),
929 .mode = 0644,
930 .proc_handler = &proc_dointvec,
931 },
932 {
933 .ctl_name = FS_DENTRY,
934 .procname = "dentry-state",
935 .data = &dentry_stat,
936 .maxlen = 6*sizeof(int),
937 .mode = 0444,
938 .proc_handler = &proc_dointvec,
939 },
940 {
941 .ctl_name = FS_OVERFLOWUID,
942 .procname = "overflowuid",
943 .data = &fs_overflowuid,
944 .maxlen = sizeof(int),
945 .mode = 0644,
946 .proc_handler = &proc_dointvec_minmax,
947 .strategy = &sysctl_intvec,
948 .extra1 = &minolduid,
949 .extra2 = &maxolduid,
950 },
951 {
952 .ctl_name = FS_OVERFLOWGID,
953 .procname = "overflowgid",
954 .data = &fs_overflowgid,
955 .maxlen = sizeof(int),
956 .mode = 0644,
957 .proc_handler = &proc_dointvec_minmax,
958 .strategy = &sysctl_intvec,
959 .extra1 = &minolduid,
960 .extra2 = &maxolduid,
961 },
962 {
963 .ctl_name = FS_LEASES,
964 .procname = "leases-enable",
965 .data = &leases_enable,
966 .maxlen = sizeof(int),
967 .mode = 0644,
968 .proc_handler = &proc_dointvec,
969 },
970#ifdef CONFIG_DNOTIFY
971 {
972 .ctl_name = FS_DIR_NOTIFY,
973 .procname = "dir-notify-enable",
974 .data = &dir_notify_enable,
975 .maxlen = sizeof(int),
976 .mode = 0644,
977 .proc_handler = &proc_dointvec,
978 },
979#endif
980#ifdef CONFIG_MMU
981 {
982 .ctl_name = FS_LEASE_TIME,
983 .procname = "lease-break-time",
984 .data = &lease_break_time,
985 .maxlen = sizeof(int),
986 .mode = 0644,
987 .proc_handler = &proc_dointvec,
988 },
989 {
990 .ctl_name = FS_AIO_NR,
991 .procname = "aio-nr",
992 .data = &aio_nr,
993 .maxlen = sizeof(aio_nr),
994 .mode = 0444,
d55b5fda 995 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 996 },
997 {
998 .ctl_name = FS_AIO_MAX_NR,
999 .procname = "aio-max-nr",
1000 .data = &aio_max_nr,
1001 .maxlen = sizeof(aio_max_nr),
1002 .mode = 0644,
d55b5fda 1003 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1004 },
0399cb08
RL		 1005#ifdef CONFIG_INOTIFY
1006 {
1007 .ctl_name = FS_INOTIFY,
1008 .procname = "inotify",
1009 .mode = 0555,
1010 .child = inotify_table,
1011 },
1012#endif
1da177e4 1013#endif
d6e71144
AC		 1014 {
1015 .ctl_name = KERN_SETUID_DUMPABLE,
1016 .procname = "suid_dumpable",
1017 .data = &suid_dumpable,
1018 .maxlen = sizeof(int),
1019 .mode = 0644,
1020 .proc_handler = &proc_dointvec,
1021 },
1da177e4
LT		 1022 { .ctl_name = 0 }
1023};
1024
1025static ctl_table debug_table[] = {
1026 { .ctl_name = 0 }
1027};
1028
1029static ctl_table dev_table[] = {
1030 { .ctl_name = 0 }
0eeca283 1031};
1da177e4
LT		 1032
1033extern void init_irq_proc (void);
1034
330d57fb
AV		 1035static DEFINE_SPINLOCK(sysctl_lock);
1036
1037/* called under sysctl_lock */
1038static int use_table(struct ctl_table_header *p)
1039{
1040 if (unlikely(p->unregistering))
1041 return 0;
1042 p->used++;
1043 return 1;
1044}
1045
1046/* called under sysctl_lock */
1047static void unuse_table(struct ctl_table_header *p)
1048{
1049 if (!--p->used)
1050 if (unlikely(p->unregistering))
1051 complete(p->unregistering);
1052}
1053
1054/* called under sysctl_lock, will reacquire if has to wait */
1055static void start_unregistering(struct ctl_table_header *p)
1056{
1057 /*
1058 * if p->used is 0, nobody will ever touch that entry again;
1059 * we'll eliminate all paths to it before dropping sysctl_lock
1060 */
1061 if (unlikely(p->used)) {
1062 struct completion wait;
1063 init_completion(&wait);
1064 p->unregistering = &wait;
1065 spin_unlock(&sysctl_lock);
1066 wait_for_completion(&wait);
1067 spin_lock(&sysctl_lock);
1068 }
1069 /*
1070 * do not remove from the list until nobody holds it; walking the
1071 * list in do_sysctl() relies on that.
1072 */
1073 list_del_init(&p->ctl_entry);
1074}
1075
1da177e4
LT		 1076void __init sysctl_init(void)
1077{
1078#ifdef CONFIG_PROC_FS
330d57fb 1079 register_proc_table(root_table, proc_sys_root, &root_table_header);
1da177e4
LT		 1080 init_irq_proc();
1081#endif
1082}
1083
1084int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1085 void __user *newval, size_t newlen)
1086{
1087 struct list_head *tmp;
330d57fb 1088 int error = -ENOTDIR;
1da177e4
LT		 1089
1090 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1091 return -ENOTDIR;
1092 if (oldval) {
1093 int old_len;
1094 if (!oldlenp || get_user(old_len, oldlenp))
1095 return -EFAULT;
1096 }
330d57fb 1097 spin_lock(&sysctl_lock);
1da177e4
LT		 1098 tmp = &root_table_header.ctl_entry;
1099 do {
1100 struct ctl_table_header *head =
1101 list_entry(tmp, struct ctl_table_header, ctl_entry);
1102 void *context = NULL;
330d57fb
AV		 1103
1104 if (!use_table(head))
1105 continue;
1106
1107 spin_unlock(&sysctl_lock);
1108
1109 error = parse_table(name, nlen, oldval, oldlenp,
1da177e4
LT		 1110 newval, newlen, head->ctl_table,
1111 &context);
5a6b454f 1112 kfree(context);
330d57fb
AV		 1113
1114 spin_lock(&sysctl_lock);
1115 unuse_table(head);
1da177e4 1116 if (error != -ENOTDIR)
330d57fb
AV		 1117 break;
1118 } while ((tmp = tmp->next) != &root_table_header.ctl_entry);
1119 spin_unlock(&sysctl_lock);
1120 return error;
1da177e4
LT		 1121}
1122
1123asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1124{
1125 struct __sysctl_args tmp;
1126 int error;
1127
1128 if (copy_from_user(&tmp, args, sizeof(tmp)))
1129 return -EFAULT;
1130
1131 lock_kernel();
1132 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1133 tmp.newval, tmp.newlen);
1134 unlock_kernel();
1135 return error;
1136}
1137
1138/*
1139 * ctl_perm does NOT grant the superuser all rights automatically, because
1140 * some sysctl variables are readonly even to root.
1141 */
1142
1143static int test_perm(int mode, int op)
1144{
1145 if (!current->euid)
1146 mode >>= 6;
1147 else if (in_egroup_p(0))
1148 mode >>= 3;
1149 if ((mode & op & 0007) == op)
1150 return 0;
1151 return -EACCES;
1152}
1153
1154static inline int ctl_perm(ctl_table *table, int op)
1155{
1156 int error;
1157 error = security_sysctl(table, op);
1158 if (error)
1159 return error;
1160 return test_perm(table->mode, op);
1161}
1162
1163static int parse_table(int __user *name, int nlen,
1164 void __user *oldval, size_t __user *oldlenp,
1165 void __user *newval, size_t newlen,
1166 ctl_table *table, void **context)
1167{
1168 int n;
1169repeat:
1170 if (!nlen)
1171 return -ENOTDIR;
1172 if (get_user(n, name))
1173 return -EFAULT;
1174 for ( ; table->ctl_name; table++) {
1175 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1176 int error;
1177 if (table->child) {
1178 if (ctl_perm(table, 001))
1179 return -EPERM;
1180 if (table->strategy) {
1181 error = table->strategy(
1182 table, name, nlen,
1183 oldval, oldlenp,
1184 newval, newlen, context);
1185 if (error)
1186 return error;
1187 }
1188 name++;
1189 nlen--;
1190 table = table->child;
1191 goto repeat;
1192 }
1193 error = do_sysctl_strategy(table, name, nlen,
1194 oldval, oldlenp,
1195 newval, newlen, context);
1196 return error;
1197 }
1198 }
1199 return -ENOTDIR;
1200}
1201
1202/* Perform the actual read/write of a sysctl table entry. */
1203int do_sysctl_strategy (ctl_table *table,
1204 int __user *name, int nlen,
1205 void __user *oldval, size_t __user *oldlenp,
1206 void __user *newval, size_t newlen, void **context)
1207{
1208 int op = 0, rc;
1209 size_t len;
1210
1211 if (oldval)
1212 op |= 004;
1213 if (newval)
1214 op |= 002;
1215 if (ctl_perm(table, op))
1216 return -EPERM;
1217
1218 if (table->strategy) {
1219 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1220 newval, newlen, context);
1221 if (rc < 0)
1222 return rc;
1223 if (rc > 0)
1224 return 0;
1225 }
1226
1227 /* If there is no strategy routine, or if the strategy returns
1228 * zero, proceed with automatic r/w */
1229 if (table->data && table->maxlen) {
1230 if (oldval && oldlenp) {
1231 if (get_user(len, oldlenp))
1232 return -EFAULT;
1233 if (len) {
1234 if (len > table->maxlen)
1235 len = table->maxlen;
1236 if(copy_to_user(oldval, table->data, len))
1237 return -EFAULT;
1238 if(put_user(len, oldlenp))
1239 return -EFAULT;
1240 }
1241 }
1242 if (newval && newlen) {
1243 len = newlen;
1244 if (len > table->maxlen)
1245 len = table->maxlen;
1246 if(copy_from_user(table->data, newval, len))
1247 return -EFAULT;
1248 }
1249 }
1250 return 0;
1251}
1252
1253/**
1254 * register_sysctl_table - register a sysctl hierarchy
1255 * @table: the top-level table structure
1256 * @insert_at_head: whether the entry should be inserted in front or at the end
1257 *
1258 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1259 * array. An entry with a ctl_name of 0 terminates the table.
1260 *
1261 * The members of the &ctl_table structure are used as follows:
1262 *
1263 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1264 * must be unique within that level of sysctl
1265 *
1266 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1267 * enter a sysctl file
1268 *
1269 * data - a pointer to data for use by proc_handler
1270 *
1271 * maxlen - the maximum size in bytes of the data
1272 *
1273 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1274 *
1275 * child - a pointer to the child sysctl table if this entry is a directory, or
1276 * %NULL.
1277 *
1278 * proc_handler - the text handler routine (described below)
1279 *
1280 * strategy - the strategy routine (described below)
1281 *
1282 * de - for internal use by the sysctl routines
1283 *
1284 * extra1, extra2 - extra pointers usable by the proc handler routines
1285 *
1286 * Leaf nodes in the sysctl tree will be represented by a single file
1287 * under /proc; non-leaf nodes will be represented by directories.
1288 *
1289 * sysctl(2) can automatically manage read and write requests through
1290 * the sysctl table. The data and maxlen fields of the ctl_table
1291 * struct enable minimal validation of the values being written to be
1292 * performed, and the mode field allows minimal authentication.
1293 *
1294 * More sophisticated management can be enabled by the provision of a
1295 * strategy routine with the table entry. This will be called before
1296 * any automatic read or write of the data is performed.
1297 *
1298 * The strategy routine may return
1299 *
1300 * < 0 - Error occurred (error is passed to user process)
1301 *
1302 * 0 - OK - proceed with automatic read or write.
1303 *
1304 * > 0 - OK - read or write has been done by the strategy routine, so
1305 * return immediately.
1306 *
1307 * There must be a proc_handler routine for any terminal nodes
1308 * mirrored under /proc/sys (non-terminals are handled by a built-in
1309 * directory handler). Several default handlers are available to
1310 * cover common cases -
1311 *
1312 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1313 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1314 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1315 *
1316 * It is the handler's job to read the input buffer from user memory
1317 * and process it. The handler should return 0 on success.
1318 *
1319 * This routine returns %NULL on a failure to register, and a pointer
1320 * to the table header on success.
1321 */
1322struct ctl_table_header *register_sysctl_table(ctl_table * table,
1323 int insert_at_head)
1324{
1325 struct ctl_table_header *tmp;
1326 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1327 if (!tmp)
1328 return NULL;
1329 tmp->ctl_table = table;
1330 INIT_LIST_HEAD(&tmp->ctl_entry);
330d57fb
AV		 1331 tmp->used = 0;
1332 tmp->unregistering = NULL;
1333 spin_lock(&sysctl_lock);
1da177e4
LT		 1334 if (insert_at_head)
1335 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1336 else
1337 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
330d57fb 1338 spin_unlock(&sysctl_lock);
1da177e4 1339#ifdef CONFIG_PROC_FS
330d57fb 1340 register_proc_table(table, proc_sys_root, tmp);
1da177e4
LT		 1341#endif
1342 return tmp;
1343}
1344
1345/**
1346 * unregister_sysctl_table - unregister a sysctl table hierarchy
1347 * @header: the header returned from register_sysctl_table
1348 *
1349 * Unregisters the sysctl table and all children. proc entries may not
1350 * actually be removed until they are no longer used by anyone.
1351 */
1352void unregister_sysctl_table(struct ctl_table_header * header)
1353{
330d57fb
AV		 1354 might_sleep();
1355 spin_lock(&sysctl_lock);
1356 start_unregistering(header);
1da177e4
LT		 1357#ifdef CONFIG_PROC_FS
1358 unregister_proc_table(header->ctl_table, proc_sys_root);
1359#endif
330d57fb 1360 spin_unlock(&sysctl_lock);
1da177e4
LT		 1361 kfree(header);
1362}
1363
1364/*
1365 * /proc/sys support
1366 */
1367
1368#ifdef CONFIG_PROC_FS
1369
1370/* Scan the sysctl entries in table and add them all into /proc */
330d57fb 1371static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set)
1da177e4
LT		 1372{
1373 struct proc_dir_entry *de;
1374 int len;
1375 mode_t mode;
1376
1377 for (; table->ctl_name; table++) {
1378 /* Can't do anything without a proc name. */
1379 if (!table->procname)
1380 continue;
1381 /* Maybe we can't do anything with it... */
1382 if (!table->proc_handler && !table->child) {
1383 printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1384 table->procname);
1385 continue;
1386 }
1387
1388 len = strlen(table->procname);
1389 mode = table->mode;
1390
1391 de = NULL;
1392 if (table->proc_handler)
1393 mode |= S_IFREG;
1394 else {
1395 mode |= S_IFDIR;
1396 for (de = root->subdir; de; de = de->next) {
1397 if (proc_match(len, table->procname, de))
1398 break;
1399 }
1400 /* If the subdir exists already, de is non-NULL */
1401 }
1402
1403 if (!de) {
1404 de = create_proc_entry(table->procname, mode, root);
1405 if (!de)
1406 continue;
330d57fb 1407 de->set = set;
1da177e4
LT		 1408 de->data = (void *) table;
1409 if (table->proc_handler)
1410 de->proc_fops = &proc_sys_file_operations;
1411 }
1412 table->de = de;
1413 if (de->mode & S_IFDIR)
330d57fb 1414 register_proc_table(table->child, de, set);
1da177e4
LT		 1415 }
1416}
1417
1418/*
1419 * Unregister a /proc sysctl table and any subdirectories.
1420 */
1421static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1422{
1423 struct proc_dir_entry *de;
1424 for (; table->ctl_name; table++) {
1425 if (!(de = table->de))
1426 continue;
1427 if (de->mode & S_IFDIR) {
1428 if (!table->child) {
1429 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1430 continue;
1431 }
1432 unregister_proc_table(table->child, de);
1433
1434 /* Don't unregister directories which still have entries.. */
1435 if (de->subdir)
1436 continue;
1437 }
1438
330d57fb
AV		 1439 /*
1440 * In any case, mark the entry as goner; we'll keep it
1441 * around if it's busy, but we'll know to do nothing with
1442 * its fields. We are under sysctl_lock here.
1443 */
1444 de->data = NULL;
1445
1da177e4
LT		 1446 /* Don't unregister proc entries that are still being used.. */
1447 if (atomic_read(&de->count))
1448 continue;
1449
1450 table->de = NULL;
1451 remove_proc_entry(table->procname, root);
1452 }
1453}
1454
1455static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1456 size_t count, loff_t *ppos)
1457{
1458 int op;
330d57fb 1459 struct proc_dir_entry *de = PDE(file->f_dentry->d_inode);
1da177e4
LT		 1460 struct ctl_table *table;
1461 size_t res;
330d57fb 1462 ssize_t error = -ENOTDIR;
1da177e4 1463
330d57fb
AV		 1464 spin_lock(&sysctl_lock);
1465 if (de && de->data && use_table(de->set)) {
1466 /*
1467 * at that point we know that sysctl was not unregistered
1468 * and won't be until we finish
1469 */
1470 spin_unlock(&sysctl_lock);
1471 table = (struct ctl_table *) de->data;
1472 if (!table || !table->proc_handler)
1473 goto out;
1474 error = -EPERM;
1475 op = (write ? 002 : 004);
1476 if (ctl_perm(table, op))
1477 goto out;
1478
1479 /* careful: calling conventions are nasty here */
1480 res = count;
1481 error = (*table->proc_handler)(table, write, file,
1482 buf, &res, ppos);
1483 if (!error)
1484 error = res;
1485 out:
1486 spin_lock(&sysctl_lock);
1487 unuse_table(de->set);
1488 }
1489 spin_unlock(&sysctl_lock);
1490 return error;
1da177e4
LT		 1491}
1492
1493static int proc_opensys(struct inode *inode, struct file *file)
1494{
1495 if (file->f_mode & FMODE_WRITE) {
1496 /*
1497 * sysctl entries that are not writable,
1498 * are _NOT_ writable, capabilities or not.
1499 */
1500 if (!(inode->i_mode & S_IWUSR))
1501 return -EPERM;
1502 }
1503
1504 return 0;
1505}
1506
1507static ssize_t proc_readsys(struct file * file, char __user * buf,
1508 size_t count, loff_t *ppos)
1509{
1510 return do_rw_proc(0, file, buf, count, ppos);
1511}
1512
1513static ssize_t proc_writesys(struct file * file, const char __user * buf,
1514 size_t count, loff_t *ppos)
1515{
1516 return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1517}
1518
1519/**
1520 * proc_dostring - read a string sysctl
1521 * @table: the sysctl table
1522 * @write: %TRUE if this is a write to the sysctl file
1523 * @filp: the file structure
1524 * @buffer: the user buffer
1525 * @lenp: the size of the user buffer
1526 * @ppos: file position
1527 *
1528 * Reads/writes a string from/to the user buffer. If the kernel
1529 * buffer provided is not large enough to hold the string, the
1530 * string is truncated. The copied string is %NULL-terminated.
1531 * If the string is being read by the user process, it is copied
1532 * and a newline '\n' is added. It is truncated if the buffer is
1533 * not large enough.
1534 *
1535 * Returns 0 on success.
1536 */
1537int proc_dostring(ctl_table *table, int write, struct file *filp,
1538 void __user *buffer, size_t *lenp, loff_t *ppos)
1539{
1540 size_t len;
1541 char __user *p;
1542 char c;
1543
1544 if (!table->data || !table->maxlen || !*lenp ||
1545 (*ppos && !write)) {
1546 *lenp = 0;
1547 return 0;
1548 }
1549
1550 if (write) {
1551 len = 0;
1552 p = buffer;
1553 while (len < *lenp) {
1554 if (get_user(c, p++))
1555 return -EFAULT;
1556 if (c == 0 || c == '\n')
1557 break;
1558 len++;
1559 }
1560 if (len >= table->maxlen)
1561 len = table->maxlen-1;
1562 if(copy_from_user(table->data, buffer, len))
1563 return -EFAULT;
1564 ((char *) table->data)[len] = 0;
1565 *ppos += *lenp;
1566 } else {
1567 len = strlen(table->data);
1568 if (len > table->maxlen)
1569 len = table->maxlen;
1570 if (len > *lenp)
1571 len = *lenp;
1572 if (len)
1573 if(copy_to_user(buffer, table->data, len))
1574 return -EFAULT;
1575 if (len < *lenp) {
1576 if(put_user('\n', ((char __user *) buffer) + len))
1577 return -EFAULT;
1578 len++;
1579 }
1580 *lenp = len;
1581 *ppos += len;
1582 }
1583 return 0;
1584}
1585
1586/*
1587 * Special case of dostring for the UTS structure. This has locks
1588 * to observe. Should this be in kernel/sys.c ????
1589 */
1590
1591static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1592 void __user *buffer, size_t *lenp, loff_t *ppos)
1593{
1594 int r;
1595
1596 if (!write) {
1597 down_read(&uts_sem);
1598 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1599 up_read(&uts_sem);
1600 } else {
1601 down_write(&uts_sem);
1602 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1603 up_write(&uts_sem);
1604 }
1605 return r;
1606}
1607
1608static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1609 int *valp,
1610 int write, void *data)
1611{
1612 if (write) {
1613 *valp = *negp ? -*lvalp : *lvalp;
1614 } else {
1615 int val = *valp;
1616 if (val < 0) {
1617 *negp = -1;
1618 *lvalp = (unsigned long)-val;
1619 } else {
1620 *negp = 0;
1621 *lvalp = (unsigned long)val;
1622 }
1623 }
1624 return 0;
1625}
1626
1627static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1628 void __user *buffer, size_t *lenp, loff_t *ppos,
1629 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1630 int write, void *data),
1631 void *data)
1632{
1633#define TMPBUFLEN 21
1634 int *i, vleft, first=1, neg, val;
1635 unsigned long lval;
1636 size_t left, len;
1637
1638 char buf[TMPBUFLEN], *p;
1639 char __user *s = buffer;
1640
1641 if (!table->data || !table->maxlen || !*lenp ||
1642 (*ppos && !write)) {
1643 *lenp = 0;
1644 return 0;
1645 }
1646
1647 i = (int *) table->data;
1648 vleft = table->maxlen / sizeof(*i);
1649 left = *lenp;
1650
1651 if (!conv)
1652 conv = do_proc_dointvec_conv;
1653
1654 for (; left && vleft--; i++, first=0) {
1655 if (write) {
1656 while (left) {
1657 char c;
1658 if (get_user(c, s))
1659 return -EFAULT;
1660 if (!isspace(c))
1661 break;
1662 left--;
1663 s++;
1664 }
1665 if (!left)
1666 break;
1667 neg = 0;
1668 len = left;
1669 if (len > sizeof(buf) - 1)
1670 len = sizeof(buf) - 1;
1671 if (copy_from_user(buf, s, len))
1672 return -EFAULT;
1673 buf[len] = 0;
1674 p = buf;
1675 if (*p == '-' && left > 1) {
1676 neg = 1;
1677 left--, p++;
1678 }
1679 if (*p < '0' || *p > '9')
1680 break;
1681
1682 lval = simple_strtoul(p, &p, 0);
1683
1684 len = p-buf;
1685 if ((len < left) && *p && !isspace(*p))
1686 break;
1687 if (neg)
1688 val = -val;
1689 s += len;
1690 left -= len;
1691
1692 if (conv(&neg, &lval, i, 1, data))
1693 break;
1694 } else {
1695 p = buf;
1696 if (!first)
1697 *p++ = '\t';
1698
1699 if (conv(&neg, &lval, i, 0, data))
1700 break;
1701
1702 sprintf(p, "%s%lu", neg ? "-" : "", lval);
1703 len = strlen(buf);
1704 if (len > left)
1705 len = left;
1706 if(copy_to_user(s, buf, len))
1707 return -EFAULT;
1708 left -= len;
1709 s += len;
1710 }
1711 }
1712
1713 if (!write && !first && left) {
1714 if(put_user('\n', s))
1715 return -EFAULT;
1716 left--, s++;
1717 }
1718 if (write) {
1719 while (left) {
1720 char c;
1721 if (get_user(c, s++))
1722 return -EFAULT;
1723 if (!isspace(c))
1724 break;
1725 left--;
1726 }
1727 }
1728 if (write && first)
1729 return -EINVAL;
1730 *lenp -= left;
1731 *ppos += *lenp;
1732 return 0;
1733#undef TMPBUFLEN
1734}
1735
1736/**
1737 * proc_dointvec - read a vector of integers
1738 * @table: the sysctl table
1739 * @write: %TRUE if this is a write to the sysctl file
1740 * @filp: the file structure
1741 * @buffer: the user buffer
1742 * @lenp: the size of the user buffer
1743 * @ppos: file position
1744 *
1745 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1746 * values from/to the user buffer, treated as an ASCII string.
1747 *
1748 * Returns 0 on success.
1749 */
1750int proc_dointvec(ctl_table *table, int write, struct file *filp,
1751 void __user *buffer, size_t *lenp, loff_t *ppos)
1752{
1753 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1754 NULL,NULL);
1755}
1756
1757#define OP_SET 0
1758#define OP_AND 1
1759#define OP_OR 2
1760#define OP_MAX 3
1761#define OP_MIN 4
1762
1763static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1764 int *valp,
1765 int write, void *data)
1766{
1767 int op = *(int *)data;
1768 if (write) {
1769 int val = *negp ? -*lvalp : *lvalp;
1770 switch(op) {
1771 case OP_SET: *valp = val; break;
1772 case OP_AND: *valp &= val; break;
1773 case OP_OR: *valp |= val; break;
1774 case OP_MAX: if(*valp < val)
1775 *valp = val;
1776 break;
1777 case OP_MIN: if(*valp > val)
1778 *valp = val;
1779 break;
1780 }
1781 } else {
1782 int val = *valp;
1783 if (val < 0) {
1784 *negp = -1;
1785 *lvalp = (unsigned long)-val;
1786 } else {
1787 *negp = 0;
1788 *lvalp = (unsigned long)val;
1789 }
1790 }
1791 return 0;
1792}
1793
1794/*
1795 * init may raise the set.
1796 */
1797
1798int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1799 void __user *buffer, size_t *lenp, loff_t *ppos)
1800{
1801 int op;
1802
1803 if (!capable(CAP_SYS_MODULE)) {
1804 return -EPERM;
1805 }
1806
1807 op = (current->pid == 1) ? OP_SET : OP_AND;
1808 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1809 do_proc_dointvec_bset_conv,&op);
1810}
1811
1812struct do_proc_dointvec_minmax_conv_param {
1813 int *min;
1814 int *max;
1815};
1816
1817static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1818 int *valp,
1819 int write, void *data)
1820{
1821 struct do_proc_dointvec_minmax_conv_param *param = data;
1822 if (write) {
1823 int val = *negp ? -*lvalp : *lvalp;
1824 if ((param->min && *param->min > val) ||
1825 (param->max && *param->max < val))
1826 return -EINVAL;
1827 *valp = val;
1828 } else {
1829 int val = *valp;
1830 if (val < 0) {
1831 *negp = -1;
1832 *lvalp = (unsigned long)-val;
1833 } else {
1834 *negp = 0;
1835 *lvalp = (unsigned long)val;
1836 }
1837 }
1838 return 0;
1839}
1840
1841/**
1842 * proc_dointvec_minmax - read a vector of integers with min/max values
1843 * @table: the sysctl table
1844 * @write: %TRUE if this is a write to the sysctl file
1845 * @filp: the file structure
1846 * @buffer: the user buffer
1847 * @lenp: the size of the user buffer
1848 * @ppos: file position
1849 *
1850 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1851 * values from/to the user buffer, treated as an ASCII string.
1852 *
1853 * This routine will ensure the values are within the range specified by
1854 * table->extra1 (min) and table->extra2 (max).
1855 *
1856 * Returns 0 on success.
1857 */
1858int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1859 void __user *buffer, size_t *lenp, loff_t *ppos)
1860{
1861 struct do_proc_dointvec_minmax_conv_param param = {
1862 .min = (int *) table->extra1,
1863 .max = (int *) table->extra2,
1864 };
1865 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1866 do_proc_dointvec_minmax_conv, &param);
1867}
1868
1869static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1870 struct file *filp,
1871 void __user *buffer,
1872 size_t *lenp, loff_t *ppos,
1873 unsigned long convmul,
1874 unsigned long convdiv)
1875{
1876#define TMPBUFLEN 21
1877 unsigned long *i, *min, *max, val;
1878 int vleft, first=1, neg;
1879 size_t len, left;
1880 char buf[TMPBUFLEN], *p;
1881 char __user *s = buffer;
1882
1883 if (!table->data || !table->maxlen || !*lenp ||
1884 (*ppos && !write)) {
1885 *lenp = 0;
1886 return 0;
1887 }
1888
1889 i = (unsigned long *) table->data;
1890 min = (unsigned long *) table->extra1;
1891 max = (unsigned long *) table->extra2;
1892 vleft = table->maxlen / sizeof(unsigned long);
1893 left = *lenp;
1894
1895 for (; left && vleft--; i++, min++, max++, first=0) {
1896 if (write) {
1897 while (left) {
1898 char c;
1899 if (get_user(c, s))
1900 return -EFAULT;
1901 if (!isspace(c))
1902 break;
1903 left--;
1904 s++;
1905 }
1906 if (!left)
1907 break;
1908 neg = 0;
1909 len = left;
1910 if (len > TMPBUFLEN-1)
1911 len = TMPBUFLEN-1;
1912 if (copy_from_user(buf, s, len))
1913 return -EFAULT;
1914 buf[len] = 0;
1915 p = buf;
1916 if (*p == '-' && left > 1) {
1917 neg = 1;
1918 left--, p++;
1919 }
1920 if (*p < '0' || *p > '9')
1921 break;
1922 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1923 len = p-buf;
1924 if ((len < left) && *p && !isspace(*p))
1925 break;
1926 if (neg)
1927 val = -val;
1928 s += len;
1929 left -= len;
1930
1931 if(neg)
1932 continue;
1933 if ((min && val < *min) || (max && val > *max))
1934 continue;
1935 *i = val;
1936 } else {
1937 p = buf;
1938 if (!first)
1939 *p++ = '\t';
1940 sprintf(p, "%lu", convdiv * (*i) / convmul);
1941 len = strlen(buf);
1942 if (len > left)
1943 len = left;
1944 if(copy_to_user(s, buf, len))
1945 return -EFAULT;
1946 left -= len;
1947 s += len;
1948 }
1949 }
1950
1951 if (!write && !first && left) {
1952 if(put_user('\n', s))
1953 return -EFAULT;
1954 left--, s++;
1955 }
1956 if (write) {
1957 while (left) {
1958 char c;
1959 if (get_user(c, s++))
1960 return -EFAULT;
1961 if (!isspace(c))
1962 break;
1963 left--;
1964 }
1965 }
1966 if (write && first)
1967 return -EINVAL;
1968 *lenp -= left;
1969 *ppos += *lenp;
1970 return 0;
1971#undef TMPBUFLEN
1972}
1973
1974/**
1975 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1976 * @table: the sysctl table
1977 * @write: %TRUE if this is a write to the sysctl file
1978 * @filp: the file structure
1979 * @buffer: the user buffer
1980 * @lenp: the size of the user buffer
1981 * @ppos: file position
1982 *
1983 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1984 * values from/to the user buffer, treated as an ASCII string.
1985 *
1986 * This routine will ensure the values are within the range specified by
1987 * table->extra1 (min) and table->extra2 (max).
1988 *
1989 * Returns 0 on success.
1990 */
1991int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
1992 void __user *buffer, size_t *lenp, loff_t *ppos)
1993{
1994 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
1995}
1996
1997/**
1998 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1999 * @table: the sysctl table
2000 * @write: %TRUE if this is a write to the sysctl file
2001 * @filp: the file structure
2002 * @buffer: the user buffer
2003 * @lenp: the size of the user buffer
2004 * @ppos: file position
2005 *
2006 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2007 * values from/to the user buffer, treated as an ASCII string. The values
2008 * are treated as milliseconds, and converted to jiffies when they are stored.
2009 *
2010 * This routine will ensure the values are within the range specified by
2011 * table->extra1 (min) and table->extra2 (max).
2012 *
2013 * Returns 0 on success.
2014 */
2015int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2016 struct file *filp,
2017 void __user *buffer,
2018 size_t *lenp, loff_t *ppos)
2019{
2020 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2021 lenp, ppos, HZ, 1000l);
2022}
2023
2024
2025static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2026 int *valp,
2027 int write, void *data)
2028{
2029 if (write) {
2030 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2031 } else {
2032 int val = *valp;
2033 unsigned long lval;
2034 if (val < 0) {
2035 *negp = -1;
2036 lval = (unsigned long)-val;
2037 } else {
2038 *negp = 0;
2039 lval = (unsigned long)val;
2040 }
2041 *lvalp = lval / HZ;
2042 }
2043 return 0;
2044}
2045
2046static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2047 int *valp,
2048 int write, void *data)
2049{
2050 if (write) {
2051 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2052 } else {
2053 int val = *valp;
2054 unsigned long lval;
2055 if (val < 0) {
2056 *negp = -1;
2057 lval = (unsigned long)-val;
2058 } else {
2059 *negp = 0;
2060 lval = (unsigned long)val;
2061 }
2062 *lvalp = jiffies_to_clock_t(lval);
2063 }
2064 return 0;
2065}
2066
2067static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2068 int *valp,
2069 int write, void *data)
2070{
2071 if (write) {
2072 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2073 } else {
2074 int val = *valp;
2075 unsigned long lval;
2076 if (val < 0) {
2077 *negp = -1;
2078 lval = (unsigned long)-val;
2079 } else {
2080 *negp = 0;
2081 lval = (unsigned long)val;
2082 }
2083 *lvalp = jiffies_to_msecs(lval);
2084 }
2085 return 0;
2086}
2087
2088/**
2089 * proc_dointvec_jiffies - read a vector of integers as seconds
2090 * @table: the sysctl table
2091 * @write: %TRUE if this is a write to the sysctl file
2092 * @filp: the file structure
2093 * @buffer: the user buffer
2094 * @lenp: the size of the user buffer
2095 * @ppos: file position
2096 *
2097 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2098 * values from/to the user buffer, treated as an ASCII string.
2099 * The values read are assumed to be in seconds, and are converted into
2100 * jiffies.
2101 *
2102 * Returns 0 on success.
2103 */
2104int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2105 void __user *buffer, size_t *lenp, loff_t *ppos)
2106{
2107 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2108 do_proc_dointvec_jiffies_conv,NULL);
2109}
2110
2111/**
2112 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2113 * @table: the sysctl table
2114 * @write: %TRUE if this is a write to the sysctl file
2115 * @filp: the file structure
2116 * @buffer: the user buffer
2117 * @lenp: the size of the user buffer
1e5d5331 2118 * @ppos: pointer to the file position
1da177e4
LT		 2119 *
2120 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2121 * values from/to the user buffer, treated as an ASCII string.
2122 * The values read are assumed to be in 1/USER_HZ seconds, and
2123 * are converted into jiffies.
2124 *
2125 * Returns 0 on success.
2126 */
2127int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2128 void __user *buffer, size_t *lenp, loff_t *ppos)
2129{
2130 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2131 do_proc_dointvec_userhz_jiffies_conv,NULL);
2132}
2133
2134/**
2135 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2136 * @table: the sysctl table
2137 * @write: %TRUE if this is a write to the sysctl file
2138 * @filp: the file structure
2139 * @buffer: the user buffer
2140 * @lenp: the size of the user buffer
67be2dd1
MW		 2141 * @ppos: file position
2142 * @ppos: the current position in the file
1da177e4
LT		 2143 *
2144 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2145 * values from/to the user buffer, treated as an ASCII string.
2146 * The values read are assumed to be in 1/1000 seconds, and
2147 * are converted into jiffies.
2148 *
2149 * Returns 0 on success.
2150 */
2151int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2152 void __user *buffer, size_t *lenp, loff_t *ppos)
2153{
2154 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2155 do_proc_dointvec_ms_jiffies_conv, NULL);
2156}
2157
2158#else /* CONFIG_PROC_FS */
2159
2160int proc_dostring(ctl_table *table, int write, struct file *filp,
2161 void __user *buffer, size_t *lenp, loff_t *ppos)
2162{
2163 return -ENOSYS;
2164}
2165
2166static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2167 void __user *buffer, size_t *lenp, loff_t *ppos)
2168{
2169 return -ENOSYS;
2170}
2171
2172int proc_dointvec(ctl_table *table, int write, struct file *filp,
2173 void __user *buffer, size_t *lenp, loff_t *ppos)
2174{
2175 return -ENOSYS;
2176}
2177
2178int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2179 void __user *buffer, size_t *lenp, loff_t *ppos)
2180{
2181 return -ENOSYS;
2182}
2183
2184int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2185 void __user *buffer, size_t *lenp, loff_t *ppos)
2186{
2187 return -ENOSYS;
2188}
2189
2190int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2191 void __user *buffer, size_t *lenp, loff_t *ppos)
2192{
2193 return -ENOSYS;
2194}
2195
2196int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2197 void __user *buffer, size_t *lenp, loff_t *ppos)
2198{
2199 return -ENOSYS;
2200}
2201
2202int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2203 void __user *buffer, size_t *lenp, loff_t *ppos)
2204{
2205 return -ENOSYS;
2206}
2207
2208int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2209 void __user *buffer, size_t *lenp, loff_t *ppos)
2210{
2211 return -ENOSYS;
2212}
2213
2214int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2215 struct file *filp,
2216 void __user *buffer,
2217 size_t *lenp, loff_t *ppos)
2218{
2219 return -ENOSYS;
2220}
2221
2222
2223#endif /* CONFIG_PROC_FS */
2224
2225
2226/*
2227 * General sysctl support routines
2228 */
2229
2230/* The generic string strategy routine: */
2231int sysctl_string(ctl_table *table, int __user *name, int nlen,
2232 void __user *oldval, size_t __user *oldlenp,
2233 void __user *newval, size_t newlen, void **context)
2234{
1da177e4
LT		 2235 if (!table->data || !table->maxlen)
2236 return -ENOTDIR;
2237
2238 if (oldval && oldlenp) {
de9e007d
LT		 2239 size_t bufsize;
2240 if (get_user(bufsize, oldlenp))
1da177e4 2241 return -EFAULT;
de9e007d
LT		 2242 if (bufsize) {
2243 size_t len = strlen(table->data), copied;
2244
2245 /* This shouldn't trigger for a well-formed sysctl */
2246 if (len > table->maxlen)
1da177e4 2247 len = table->maxlen;
de9e007d
LT		 2248
2249 /* Copy up to a max of bufsize-1 bytes of the string */
2250 copied = (len >= bufsize) ? bufsize - 1 : len;
2251
2252 if (copy_to_user(oldval, table->data, copied) ||
2253 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2254 return -EFAULT;
de9e007d 2255 if (put_user(len, oldlenp))
1da177e4
LT		 2256 return -EFAULT;
2257 }
2258 }
2259 if (newval && newlen) {
de9e007d 2260 size_t len = newlen;
1da177e4
LT		 2261 if (len > table->maxlen)
2262 len = table->maxlen;
2263 if(copy_from_user(table->data, newval, len))
2264 return -EFAULT;
2265 if (len == table->maxlen)
2266 len--;
2267 ((char *) table->data)[len] = 0;
2268 }
82c9df82 2269 return 1;
1da177e4
LT		 2270}
2271
2272/*
2273 * This function makes sure that all of the integers in the vector
2274 * are between the minimum and maximum values given in the arrays
2275 * table->extra1 and table->extra2, respectively.
2276 */
2277int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2278 void __user *oldval, size_t __user *oldlenp,
2279 void __user *newval, size_t newlen, void **context)
2280{
2281
2282 if (newval && newlen) {
2283 int __user *vec = (int __user *) newval;
2284 int *min = (int *) table->extra1;
2285 int *max = (int *) table->extra2;
2286 size_t length;
2287 int i;
2288
2289 if (newlen % sizeof(int) != 0)
2290 return -EINVAL;
2291
2292 if (!table->extra1 && !table->extra2)
2293 return 0;
2294
2295 if (newlen > table->maxlen)
2296 newlen = table->maxlen;
2297 length = newlen / sizeof(int);
2298
2299 for (i = 0; i < length; i++) {
2300 int value;
2301 if (get_user(value, vec + i))
2302 return -EFAULT;
2303 if (min && value < min[i])
2304 return -EINVAL;
2305 if (max && value > max[i])
2306 return -EINVAL;
2307 }
2308 }
2309 return 0;
2310}
2311
2312/* Strategy function to convert jiffies to seconds */
2313int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2314 void __user *oldval, size_t __user *oldlenp,
2315 void __user *newval, size_t newlen, void **context)
2316{
2317 if (oldval) {
2318 size_t olen;
2319 if (oldlenp) {
2320 if (get_user(olen, oldlenp))
2321 return -EFAULT;
2322 if (olen!=sizeof(int))
2323 return -EINVAL;
2324 }
2325 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2326 (oldlenp && put_user(sizeof(int),oldlenp)))
2327 return -EFAULT;
2328 }
2329 if (newval && newlen) {
2330 int new;
2331 if (newlen != sizeof(int))
2332 return -EINVAL;
2333 if (get_user(new, (int __user *)newval))
2334 return -EFAULT;
2335 *(int *)(table->data) = new*HZ;
2336 }
2337 return 1;
2338}
2339
2340/* Strategy function to convert jiffies to seconds */
2341int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2342 void __user *oldval, size_t __user *oldlenp,
2343 void __user *newval, size_t newlen, void **context)
2344{
2345 if (oldval) {
2346 size_t olen;
2347 if (oldlenp) {
2348 if (get_user(olen, oldlenp))
2349 return -EFAULT;
2350 if (olen!=sizeof(int))
2351 return -EINVAL;
2352 }
2353 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2354 (oldlenp && put_user(sizeof(int),oldlenp)))
2355 return -EFAULT;
2356 }
2357 if (newval && newlen) {
2358 int new;
2359 if (newlen != sizeof(int))
2360 return -EINVAL;
2361 if (get_user(new, (int __user *)newval))
2362 return -EFAULT;
2363 *(int *)(table->data) = msecs_to_jiffies(new);
2364 }
2365 return 1;
2366}
2367
2368#else /* CONFIG_SYSCTL */
2369
2370
2371asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2372{
2373 return -ENOSYS;
2374}
2375
2376int sysctl_string(ctl_table *table, int __user *name, int nlen,
2377 void __user *oldval, size_t __user *oldlenp,
2378 void __user *newval, size_t newlen, void **context)
2379{
2380 return -ENOSYS;
2381}
2382
2383int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2384 void __user *oldval, size_t __user *oldlenp,
2385 void __user *newval, size_t newlen, void **context)
2386{
2387 return -ENOSYS;
2388}
2389
2390int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2391 void __user *oldval, size_t __user *oldlenp,
2392 void __user *newval, size_t newlen, void **context)
2393{
2394 return -ENOSYS;
2395}
2396
2397int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2398 void __user *oldval, size_t __user *oldlenp,
2399 void __user *newval, size_t newlen, void **context)
2400{
2401 return -ENOSYS;
2402}
2403
2404int proc_dostring(ctl_table *table, int write, struct file *filp,
2405 void __user *buffer, size_t *lenp, loff_t *ppos)
2406{
2407 return -ENOSYS;
2408}
2409
2410int proc_dointvec(ctl_table *table, int write, struct file *filp,
2411 void __user *buffer, size_t *lenp, loff_t *ppos)
2412{
2413 return -ENOSYS;
2414}
2415
2416int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2417 void __user *buffer, size_t *lenp, loff_t *ppos)
2418{
2419 return -ENOSYS;
2420}
2421
2422int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2423 void __user *buffer, size_t *lenp, loff_t *ppos)
2424{
2425 return -ENOSYS;
2426}
2427
2428int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2429 void __user *buffer, size_t *lenp, loff_t *ppos)
2430{
2431 return -ENOSYS;
2432}
2433
2434int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2435 void __user *buffer, size_t *lenp, loff_t *ppos)
2436{
2437 return -ENOSYS;
2438}
2439
2440int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2441 void __user *buffer, size_t *lenp, loff_t *ppos)
2442{
2443 return -ENOSYS;
2444}
2445
2446int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2447 void __user *buffer, size_t *lenp, loff_t *ppos)
2448{
2449 return -ENOSYS;
2450}
2451
2452int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2453 struct file *filp,
2454 void __user *buffer,
2455 size_t *lenp, loff_t *ppos)
2456{
2457 return -ENOSYS;
2458}
2459
2460struct ctl_table_header * register_sysctl_table(ctl_table * table,
2461 int insert_at_head)
2462{
2463 return NULL;
2464}
2465
2466void unregister_sysctl_table(struct ctl_table_header * table)
2467{
2468}
2469
2470#endif /* CONFIG_SYSCTL */
2471
2472/*
2473 * No sense putting this after each symbol definition, twice,
2474 * exception granted :-)
2475 */
2476EXPORT_SYMBOL(proc_dointvec);
2477EXPORT_SYMBOL(proc_dointvec_jiffies);
2478EXPORT_SYMBOL(proc_dointvec_minmax);
2479EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2480EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2481EXPORT_SYMBOL(proc_dostring);
2482EXPORT_SYMBOL(proc_doulongvec_minmax);
2483EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2484EXPORT_SYMBOL(register_sysctl_table);
2485EXPORT_SYMBOL(sysctl_intvec);
2486EXPORT_SYMBOL(sysctl_jiffies);
2487EXPORT_SYMBOL(sysctl_ms_jiffies);
2488EXPORT_SYMBOL(sysctl_string);
2489EXPORT_SYMBOL(unregister_sysctl_table);
kernel source for telekom puls (alcatel/mediatek)