projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] v850: Define L1_CACHE_SHIFT and L1_CACHE_SHIFT_MAX
[linux-2.6-block.git] / kernel / sysctl.c
CommitLineData
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>
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/sysrq.h>
35#include <linux/highuid.h>
36#include <linux/writeback.h>
37#include <linux/hugetlb.h>
38#include <linux/security.h>
39#include <linux/initrd.h>
40#include <linux/times.h>
41#include <linux/limits.h>
42#include <linux/dcache.h>
43#include <linux/syscalls.h>
44
45#include <asm/uaccess.h>
46#include <asm/processor.h>
47
48#ifdef CONFIG_ROOT_NFS
49#include <linux/nfs_fs.h>
50#endif
51
52#if defined(CONFIG_SYSCTL)
53
54/* External variables not in a header file. */
55extern int C_A_D;
56extern int sysctl_overcommit_memory;
57extern int sysctl_overcommit_ratio;
58extern int max_threads;
59extern int sysrq_enabled;
60extern int core_uses_pid;
d6e71144 61extern int suid_dumpable;
1da177e4
LT		 62extern char core_pattern[];
63extern int cad_pid;
64extern int pid_max;
65extern int min_free_kbytes;
66extern int printk_ratelimit_jiffies;
67extern int printk_ratelimit_burst;
68extern int pid_max_min, pid_max_max;
69
70#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
71int unknown_nmi_panic;
72extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
73 void __user *, size_t *, loff_t *);
74#endif
75
76/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
77static int maxolduid = 65535;
78static int minolduid;
79
80static int ngroups_max = NGROUPS_MAX;
81
82#ifdef CONFIG_KMOD
83extern char modprobe_path[];
84#endif
85#ifdef CONFIG_HOTPLUG
86extern char hotplug_path[];
87#endif
88#ifdef CONFIG_CHR_DEV_SG
89extern int sg_big_buff;
90#endif
91#ifdef CONFIG_SYSVIPC
92extern size_t shm_ctlmax;
93extern size_t shm_ctlall;
94extern int shm_ctlmni;
95extern int msg_ctlmax;
96extern int msg_ctlmnb;
97extern int msg_ctlmni;
98extern int sem_ctls[];
99#endif
100
101#ifdef __sparc__
102extern char reboot_command [];
103extern int stop_a_enabled;
104extern int scons_pwroff;
105#endif
106
107#ifdef __hppa__
108extern int pwrsw_enabled;
109extern int unaligned_enabled;
110#endif
111
112#ifdef CONFIG_ARCH_S390
113#ifdef CONFIG_MATHEMU
114extern int sysctl_ieee_emulation_warnings;
115#endif
116extern int sysctl_userprocess_debug;
117#endif
118
119extern int sysctl_hz_timer;
120
121#ifdef CONFIG_BSD_PROCESS_ACCT
122extern int acct_parm[];
123#endif
124
125int randomize_va_space = 1;
126
127static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
128 ctl_table *, void **);
129static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
130 void __user *buffer, size_t *lenp, loff_t *ppos);
131
132static ctl_table root_table[];
133static struct ctl_table_header root_table_header =
134 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
135
136static ctl_table kern_table[];
137static ctl_table vm_table[];
138#ifdef CONFIG_NET
139extern ctl_table net_table[];
140#endif
141static ctl_table proc_table[];
142static ctl_table fs_table[];
143static ctl_table debug_table[];
144static ctl_table dev_table[];
145extern ctl_table random_table[];
146#ifdef CONFIG_UNIX98_PTYS
147extern ctl_table pty_table[];
148#endif
0399cb08
RL		 149#ifdef CONFIG_INOTIFY
150extern ctl_table inotify_table[];
151#endif
1da177e4
LT		 152
153#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
154int sysctl_legacy_va_layout;
155#endif
156
157/* /proc declarations: */
158
159#ifdef CONFIG_PROC_FS
160
161static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
162static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
163static int proc_opensys(struct inode *, struct file *);
164
165struct file_operations proc_sys_file_operations = {
166 .open = proc_opensys,
167 .read = proc_readsys,
168 .write = proc_writesys,
169};
170
171extern struct proc_dir_entry *proc_sys_root;
172
173static void register_proc_table(ctl_table *, struct proc_dir_entry *);
174static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
175#endif
176
177/* The default sysctl tables: */
178
179static ctl_table root_table[] = {
180 {
181 .ctl_name = CTL_KERN,
182 .procname = "kernel",
183 .mode = 0555,
184 .child = kern_table,
185 },
186 {
187 .ctl_name = CTL_VM,
188 .procname = "vm",
189 .mode = 0555,
190 .child = vm_table,
191 },
192#ifdef CONFIG_NET
193 {
194 .ctl_name = CTL_NET,
195 .procname = "net",
196 .mode = 0555,
197 .child = net_table,
198 },
199#endif
200 {
201 .ctl_name = CTL_PROC,
202 .procname = "proc",
203 .mode = 0555,
204 .child = proc_table,
205 },
206 {
207 .ctl_name = CTL_FS,
208 .procname = "fs",
209 .mode = 0555,
210 .child = fs_table,
211 },
212 {
213 .ctl_name = CTL_DEBUG,
214 .procname = "debug",
215 .mode = 0555,
216 .child = debug_table,
217 },
218 {
219 .ctl_name = CTL_DEV,
220 .procname = "dev",
221 .mode = 0555,
222 .child = dev_table,
223 },
0eeca283 224
1da177e4
LT		 225 { .ctl_name = 0 }
226};
227
228static ctl_table kern_table[] = {
229 {
230 .ctl_name = KERN_OSTYPE,
231 .procname = "ostype",
232 .data = system_utsname.sysname,
233 .maxlen = sizeof(system_utsname.sysname),
234 .mode = 0444,
235 .proc_handler = &proc_doutsstring,
236 .strategy = &sysctl_string,
237 },
238 {
239 .ctl_name = KERN_OSRELEASE,
240 .procname = "osrelease",
241 .data = system_utsname.release,
242 .maxlen = sizeof(system_utsname.release),
243 .mode = 0444,
244 .proc_handler = &proc_doutsstring,
245 .strategy = &sysctl_string,
246 },
247 {
248 .ctl_name = KERN_VERSION,
249 .procname = "version",
250 .data = system_utsname.version,
251 .maxlen = sizeof(system_utsname.version),
252 .mode = 0444,
253 .proc_handler = &proc_doutsstring,
254 .strategy = &sysctl_string,
255 },
256 {
257 .ctl_name = KERN_NODENAME,
258 .procname = "hostname",
259 .data = system_utsname.nodename,
260 .maxlen = sizeof(system_utsname.nodename),
261 .mode = 0644,
262 .proc_handler = &proc_doutsstring,
263 .strategy = &sysctl_string,
264 },
265 {
266 .ctl_name = KERN_DOMAINNAME,
267 .procname = "domainname",
268 .data = system_utsname.domainname,
269 .maxlen = sizeof(system_utsname.domainname),
270 .mode = 0644,
271 .proc_handler = &proc_doutsstring,
272 .strategy = &sysctl_string,
273 },
274 {
275 .ctl_name = KERN_PANIC,
276 .procname = "panic",
277 .data = &panic_timeout,
278 .maxlen = sizeof(int),
279 .mode = 0644,
280 .proc_handler = &proc_dointvec,
281 },
282 {
283 .ctl_name = KERN_CORE_USES_PID,
284 .procname = "core_uses_pid",
285 .data = &core_uses_pid,
286 .maxlen = sizeof(int),
287 .mode = 0644,
288 .proc_handler = &proc_dointvec,
289 },
290 {
291 .ctl_name = KERN_CORE_PATTERN,
292 .procname = "core_pattern",
293 .data = core_pattern,
294 .maxlen = 64,
295 .mode = 0644,
296 .proc_handler = &proc_dostring,
297 .strategy = &sysctl_string,
298 },
299 {
300 .ctl_name = KERN_TAINTED,
301 .procname = "tainted",
302 .data = &tainted,
303 .maxlen = sizeof(int),
304 .mode = 0444,
305 .proc_handler = &proc_dointvec,
306 },
307 {
308 .ctl_name = KERN_CAP_BSET,
309 .procname = "cap-bound",
310 .data = &cap_bset,
311 .maxlen = sizeof(kernel_cap_t),
312 .mode = 0600,
313 .proc_handler = &proc_dointvec_bset,
314 },
315#ifdef CONFIG_BLK_DEV_INITRD
316 {
317 .ctl_name = KERN_REALROOTDEV,
318 .procname = "real-root-dev",
319 .data = &real_root_dev,
320 .maxlen = sizeof(int),
321 .mode = 0644,
322 .proc_handler = &proc_dointvec,
323 },
324#endif
325#ifdef __sparc__
326 {
327 .ctl_name = KERN_SPARC_REBOOT,
328 .procname = "reboot-cmd",
329 .data = reboot_command,
330 .maxlen = 256,
331 .mode = 0644,
332 .proc_handler = &proc_dostring,
333 .strategy = &sysctl_string,
334 },
335 {
336 .ctl_name = KERN_SPARC_STOP_A,
337 .procname = "stop-a",
338 .data = &stop_a_enabled,
339 .maxlen = sizeof (int),
340 .mode = 0644,
341 .proc_handler = &proc_dointvec,
342 },
343 {
344 .ctl_name = KERN_SPARC_SCONS_PWROFF,
345 .procname = "scons-poweroff",
346 .data = &scons_pwroff,
347 .maxlen = sizeof (int),
348 .mode = 0644,
349 .proc_handler = &proc_dointvec,
350 },
351#endif
352#ifdef __hppa__
353 {
354 .ctl_name = KERN_HPPA_PWRSW,
355 .procname = "soft-power",
356 .data = &pwrsw_enabled,
357 .maxlen = sizeof (int),
358 .mode = 0644,
359 .proc_handler = &proc_dointvec,
360 },
361 {
362 .ctl_name = KERN_HPPA_UNALIGNED,
363 .procname = "unaligned-trap",
364 .data = &unaligned_enabled,
365 .maxlen = sizeof (int),
366 .mode = 0644,
367 .proc_handler = &proc_dointvec,
368 },
369#endif
370 {
371 .ctl_name = KERN_CTLALTDEL,
372 .procname = "ctrl-alt-del",
373 .data = &C_A_D,
374 .maxlen = sizeof(int),
375 .mode = 0644,
376 .proc_handler = &proc_dointvec,
377 },
378 {
379 .ctl_name = KERN_PRINTK,
380 .procname = "printk",
381 .data = &console_loglevel,
382 .maxlen = 4*sizeof(int),
383 .mode = 0644,
384 .proc_handler = &proc_dointvec,
385 },
386#ifdef CONFIG_KMOD
387 {
388 .ctl_name = KERN_MODPROBE,
389 .procname = "modprobe",
390 .data = &modprobe_path,
391 .maxlen = KMOD_PATH_LEN,
392 .mode = 0644,
393 .proc_handler = &proc_dostring,
394 .strategy = &sysctl_string,
395 },
396#endif
397#ifdef CONFIG_HOTPLUG
398 {
399 .ctl_name = KERN_HOTPLUG,
400 .procname = "hotplug",
401 .data = &hotplug_path,
402 .maxlen = HOTPLUG_PATH_LEN,
403 .mode = 0644,
404 .proc_handler = &proc_dostring,
405 .strategy = &sysctl_string,
406 },
407#endif
408#ifdef CONFIG_CHR_DEV_SG
409 {
410 .ctl_name = KERN_SG_BIG_BUFF,
411 .procname = "sg-big-buff",
412 .data = &sg_big_buff,
413 .maxlen = sizeof (int),
414 .mode = 0444,
415 .proc_handler = &proc_dointvec,
416 },
417#endif
418#ifdef CONFIG_BSD_PROCESS_ACCT
419 {
420 .ctl_name = KERN_ACCT,
421 .procname = "acct",
422 .data = &acct_parm,
423 .maxlen = 3*sizeof(int),
424 .mode = 0644,
425 .proc_handler = &proc_dointvec,
426 },
427#endif
428#ifdef CONFIG_SYSVIPC
429 {
430 .ctl_name = KERN_SHMMAX,
431 .procname = "shmmax",
432 .data = &shm_ctlmax,
433 .maxlen = sizeof (size_t),
434 .mode = 0644,
435 .proc_handler = &proc_doulongvec_minmax,
436 },
437 {
438 .ctl_name = KERN_SHMALL,
439 .procname = "shmall",
440 .data = &shm_ctlall,
441 .maxlen = sizeof (size_t),
442 .mode = 0644,
443 .proc_handler = &proc_doulongvec_minmax,
444 },
445 {
446 .ctl_name = KERN_SHMMNI,
447 .procname = "shmmni",
448 .data = &shm_ctlmni,
449 .maxlen = sizeof (int),
450 .mode = 0644,
451 .proc_handler = &proc_dointvec,
452 },
453 {
454 .ctl_name = KERN_MSGMAX,
455 .procname = "msgmax",
456 .data = &msg_ctlmax,
457 .maxlen = sizeof (int),
458 .mode = 0644,
459 .proc_handler = &proc_dointvec,
460 },
461 {
462 .ctl_name = KERN_MSGMNI,
463 .procname = "msgmni",
464 .data = &msg_ctlmni,
465 .maxlen = sizeof (int),
466 .mode = 0644,
467 .proc_handler = &proc_dointvec,
468 },
469 {
470 .ctl_name = KERN_MSGMNB,
471 .procname = "msgmnb",
472 .data = &msg_ctlmnb,
473 .maxlen = sizeof (int),
474 .mode = 0644,
475 .proc_handler = &proc_dointvec,
476 },
477 {
478 .ctl_name = KERN_SEM,
479 .procname = "sem",
480 .data = &sem_ctls,
481 .maxlen = 4*sizeof (int),
482 .mode = 0644,
483 .proc_handler = &proc_dointvec,
484 },
485#endif
486#ifdef CONFIG_MAGIC_SYSRQ
487 {
488 .ctl_name = KERN_SYSRQ,
489 .procname = "sysrq",
490 .data = &sysrq_enabled,
491 .maxlen = sizeof (int),
492 .mode = 0644,
493 .proc_handler = &proc_dointvec,
494 },
495#endif
496 {
497 .ctl_name = KERN_CADPID,
498 .procname = "cad_pid",
499 .data = &cad_pid,
500 .maxlen = sizeof (int),
501 .mode = 0600,
502 .proc_handler = &proc_dointvec,
503 },
504 {
505 .ctl_name = KERN_MAX_THREADS,
506 .procname = "threads-max",
507 .data = &max_threads,
508 .maxlen = sizeof(int),
509 .mode = 0644,
510 .proc_handler = &proc_dointvec,
511 },
512 {
513 .ctl_name = KERN_RANDOM,
514 .procname = "random",
515 .mode = 0555,
516 .child = random_table,
517 },
518#ifdef CONFIG_UNIX98_PTYS
519 {
520 .ctl_name = KERN_PTY,
521 .procname = "pty",
522 .mode = 0555,
523 .child = pty_table,
524 },
525#endif
526 {
527 .ctl_name = KERN_OVERFLOWUID,
528 .procname = "overflowuid",
529 .data = &overflowuid,
530 .maxlen = sizeof(int),
531 .mode = 0644,
532 .proc_handler = &proc_dointvec_minmax,
533 .strategy = &sysctl_intvec,
534 .extra1 = &minolduid,
535 .extra2 = &maxolduid,
536 },
537 {
538 .ctl_name = KERN_OVERFLOWGID,
539 .procname = "overflowgid",
540 .data = &overflowgid,
541 .maxlen = sizeof(int),
542 .mode = 0644,
543 .proc_handler = &proc_dointvec_minmax,
544 .strategy = &sysctl_intvec,
545 .extra1 = &minolduid,
546 .extra2 = &maxolduid,
547 },
548#ifdef CONFIG_ARCH_S390
549#ifdef CONFIG_MATHEMU
550 {
551 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
552 .procname = "ieee_emulation_warnings",
553 .data = &sysctl_ieee_emulation_warnings,
554 .maxlen = sizeof(int),
555 .mode = 0644,
556 .proc_handler = &proc_dointvec,
557 },
558#endif
559#ifdef CONFIG_NO_IDLE_HZ
560 {
561 .ctl_name = KERN_HZ_TIMER,
562 .procname = "hz_timer",
563 .data = &sysctl_hz_timer,
564 .maxlen = sizeof(int),
565 .mode = 0644,
566 .proc_handler = &proc_dointvec,
567 },
568#endif
569 {
570 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
571 .procname = "userprocess_debug",
572 .data = &sysctl_userprocess_debug,
573 .maxlen = sizeof(int),
574 .mode = 0644,
575 .proc_handler = &proc_dointvec,
576 },
577#endif
578 {
579 .ctl_name = KERN_PIDMAX,
580 .procname = "pid_max",
581 .data = &pid_max,
582 .maxlen = sizeof (int),
583 .mode = 0644,
584 .proc_handler = &proc_dointvec_minmax,
585 .strategy = sysctl_intvec,
586 .extra1 = &pid_max_min,
587 .extra2 = &pid_max_max,
588 },
589 {
590 .ctl_name = KERN_PANIC_ON_OOPS,
591 .procname = "panic_on_oops",
592 .data = &panic_on_oops,
593 .maxlen = sizeof(int),
594 .mode = 0644,
595 .proc_handler = &proc_dointvec,
596 },
597 {
598 .ctl_name = KERN_PRINTK_RATELIMIT,
599 .procname = "printk_ratelimit",
600 .data = &printk_ratelimit_jiffies,
601 .maxlen = sizeof(int),
602 .mode = 0644,
603 .proc_handler = &proc_dointvec_jiffies,
604 .strategy = &sysctl_jiffies,
605 },
606 {
607 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
608 .procname = "printk_ratelimit_burst",
609 .data = &printk_ratelimit_burst,
610 .maxlen = sizeof(int),
611 .mode = 0644,
612 .proc_handler = &proc_dointvec,
613 },
614 {
615 .ctl_name = KERN_NGROUPS_MAX,
616 .procname = "ngroups_max",
617 .data = &ngroups_max,
618 .maxlen = sizeof (int),
619 .mode = 0444,
620 .proc_handler = &proc_dointvec,
621 },
622#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
623 {
624 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
625 .procname = "unknown_nmi_panic",
626 .data = &unknown_nmi_panic,
627 .maxlen = sizeof (int),
628 .mode = 0644,
629 .proc_handler = &proc_unknown_nmi_panic,
630 },
631#endif
632#if defined(CONFIG_X86)
633 {
634 .ctl_name = KERN_BOOTLOADER_TYPE,
635 .procname = "bootloader_type",
636 .data = &bootloader_type,
637 .maxlen = sizeof (int),
638 .mode = 0444,
639 .proc_handler = &proc_dointvec,
640 },
641#endif
642 {
643 .ctl_name = KERN_RANDOMIZE,
644 .procname = "randomize_va_space",
645 .data = &randomize_va_space,
646 .maxlen = sizeof(int),
647 .mode = 0644,
648 .proc_handler = &proc_dointvec,
649 },
650
651 { .ctl_name = 0 }
652};
653
654/* Constants for minimum and maximum testing in vm_table.
655 We use these as one-element integer vectors. */
656static int zero;
657static int one_hundred = 100;
658
659
660static ctl_table vm_table[] = {
661 {
662 .ctl_name = VM_OVERCOMMIT_MEMORY,
663 .procname = "overcommit_memory",
664 .data = &sysctl_overcommit_memory,
665 .maxlen = sizeof(sysctl_overcommit_memory),
666 .mode = 0644,
667 .proc_handler = &proc_dointvec,
668 },
669 {
670 .ctl_name = VM_OVERCOMMIT_RATIO,
671 .procname = "overcommit_ratio",
672 .data = &sysctl_overcommit_ratio,
673 .maxlen = sizeof(sysctl_overcommit_ratio),
674 .mode = 0644,
675 .proc_handler = &proc_dointvec,
676 },
677 {
678 .ctl_name = VM_PAGE_CLUSTER,
679 .procname = "page-cluster",
680 .data = &page_cluster,
681 .maxlen = sizeof(int),
682 .mode = 0644,
683 .proc_handler = &proc_dointvec,
684 },
685 {
686 .ctl_name = VM_DIRTY_BACKGROUND,
687 .procname = "dirty_background_ratio",
688 .data = &dirty_background_ratio,
689 .maxlen = sizeof(dirty_background_ratio),
690 .mode = 0644,
691 .proc_handler = &proc_dointvec_minmax,
692 .strategy = &sysctl_intvec,
693 .extra1 = &zero,
694 .extra2 = &one_hundred,
695 },
696 {
697 .ctl_name = VM_DIRTY_RATIO,
698 .procname = "dirty_ratio",
699 .data = &vm_dirty_ratio,
700 .maxlen = sizeof(vm_dirty_ratio),
701 .mode = 0644,
702 .proc_handler = &proc_dointvec_minmax,
703 .strategy = &sysctl_intvec,
704 .extra1 = &zero,
705 .extra2 = &one_hundred,
706 },
707 {
708 .ctl_name = VM_DIRTY_WB_CS,
709 .procname = "dirty_writeback_centisecs",
710 .data = &dirty_writeback_centisecs,
711 .maxlen = sizeof(dirty_writeback_centisecs),
712 .mode = 0644,
713 .proc_handler = &dirty_writeback_centisecs_handler,
714 },
715 {
716 .ctl_name = VM_DIRTY_EXPIRE_CS,
717 .procname = "dirty_expire_centisecs",
718 .data = &dirty_expire_centisecs,
719 .maxlen = sizeof(dirty_expire_centisecs),
720 .mode = 0644,
721 .proc_handler = &proc_dointvec,
722 },
723 {
724 .ctl_name = VM_NR_PDFLUSH_THREADS,
725 .procname = "nr_pdflush_threads",
726 .data = &nr_pdflush_threads,
727 .maxlen = sizeof nr_pdflush_threads,
728 .mode = 0444 /* read-only*/,
729 .proc_handler = &proc_dointvec,
730 },
731 {
732 .ctl_name = VM_SWAPPINESS,
733 .procname = "swappiness",
734 .data = &vm_swappiness,
735 .maxlen = sizeof(vm_swappiness),
736 .mode = 0644,
737 .proc_handler = &proc_dointvec_minmax,
738 .strategy = &sysctl_intvec,
739 .extra1 = &zero,
740 .extra2 = &one_hundred,
741 },
742#ifdef CONFIG_HUGETLB_PAGE
743 {
744 .ctl_name = VM_HUGETLB_PAGES,
745 .procname = "nr_hugepages",
746 .data = &max_huge_pages,
747 .maxlen = sizeof(unsigned long),
748 .mode = 0644,
749 .proc_handler = &hugetlb_sysctl_handler,
750 .extra1 = (void *)&hugetlb_zero,
751 .extra2 = (void *)&hugetlb_infinity,
752 },
753 {
754 .ctl_name = VM_HUGETLB_GROUP,
755 .procname = "hugetlb_shm_group",
756 .data = &sysctl_hugetlb_shm_group,
757 .maxlen = sizeof(gid_t),
758 .mode = 0644,
759 .proc_handler = &proc_dointvec,
760 },
761#endif
762 {
763 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
764 .procname = "lowmem_reserve_ratio",
765 .data = &sysctl_lowmem_reserve_ratio,
766 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
767 .mode = 0644,
768 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
769 .strategy = &sysctl_intvec,
770 },
771 {
772 .ctl_name = VM_MIN_FREE_KBYTES,
773 .procname = "min_free_kbytes",
774 .data = &min_free_kbytes,
775 .maxlen = sizeof(min_free_kbytes),
776 .mode = 0644,
777 .proc_handler = &min_free_kbytes_sysctl_handler,
778 .strategy = &sysctl_intvec,
779 .extra1 = &zero,
780 },
781#ifdef CONFIG_MMU
782 {
783 .ctl_name = VM_MAX_MAP_COUNT,
784 .procname = "max_map_count",
785 .data = &sysctl_max_map_count,
786 .maxlen = sizeof(sysctl_max_map_count),
787 .mode = 0644,
788 .proc_handler = &proc_dointvec
789 },
790#endif
791 {
792 .ctl_name = VM_LAPTOP_MODE,
793 .procname = "laptop_mode",
794 .data = &laptop_mode,
795 .maxlen = sizeof(laptop_mode),
796 .mode = 0644,
797 .proc_handler = &proc_dointvec,
798 .strategy = &sysctl_intvec,
799 .extra1 = &zero,
800 },
801 {
802 .ctl_name = VM_BLOCK_DUMP,
803 .procname = "block_dump",
804 .data = &block_dump,
805 .maxlen = sizeof(block_dump),
806 .mode = 0644,
807 .proc_handler = &proc_dointvec,
808 .strategy = &sysctl_intvec,
809 .extra1 = &zero,
810 },
811 {
812 .ctl_name = VM_VFS_CACHE_PRESSURE,
813 .procname = "vfs_cache_pressure",
814 .data = &sysctl_vfs_cache_pressure,
815 .maxlen = sizeof(sysctl_vfs_cache_pressure),
816 .mode = 0644,
817 .proc_handler = &proc_dointvec,
818 .strategy = &sysctl_intvec,
819 .extra1 = &zero,
820 },
821#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
822 {
823 .ctl_name = VM_LEGACY_VA_LAYOUT,
824 .procname = "legacy_va_layout",
825 .data = &sysctl_legacy_va_layout,
826 .maxlen = sizeof(sysctl_legacy_va_layout),
827 .mode = 0644,
828 .proc_handler = &proc_dointvec,
829 .strategy = &sysctl_intvec,
830 .extra1 = &zero,
831 },
832#endif
833#ifdef CONFIG_SWAP
834 {
835 .ctl_name = VM_SWAP_TOKEN_TIMEOUT,
836 .procname = "swap_token_timeout",
837 .data = &swap_token_default_timeout,
838 .maxlen = sizeof(swap_token_default_timeout),
839 .mode = 0644,
840 .proc_handler = &proc_dointvec_jiffies,
841 .strategy = &sysctl_jiffies,
842 },
843#endif
844 { .ctl_name = 0 }
845};
846
847static ctl_table proc_table[] = {
848 { .ctl_name = 0 }
849};
850
851static ctl_table fs_table[] = {
852 {
853 .ctl_name = FS_NRINODE,
854 .procname = "inode-nr",
855 .data = &inodes_stat,
856 .maxlen = 2*sizeof(int),
857 .mode = 0444,
858 .proc_handler = &proc_dointvec,
859 },
860 {
861 .ctl_name = FS_STATINODE,
862 .procname = "inode-state",
863 .data = &inodes_stat,
864 .maxlen = 7*sizeof(int),
865 .mode = 0444,
866 .proc_handler = &proc_dointvec,
867 },
868 {
869 .ctl_name = FS_NRFILE,
870 .procname = "file-nr",
871 .data = &files_stat,
872 .maxlen = 3*sizeof(int),
873 .mode = 0444,
874 .proc_handler = &proc_dointvec,
875 },
876 {
877 .ctl_name = FS_MAXFILE,
878 .procname = "file-max",
879 .data = &files_stat.max_files,
880 .maxlen = sizeof(int),
881 .mode = 0644,
882 .proc_handler = &proc_dointvec,
883 },
884 {
885 .ctl_name = FS_DENTRY,
886 .procname = "dentry-state",
887 .data = &dentry_stat,
888 .maxlen = 6*sizeof(int),
889 .mode = 0444,
890 .proc_handler = &proc_dointvec,
891 },
892 {
893 .ctl_name = FS_OVERFLOWUID,
894 .procname = "overflowuid",
895 .data = &fs_overflowuid,
896 .maxlen = sizeof(int),
897 .mode = 0644,
898 .proc_handler = &proc_dointvec_minmax,
899 .strategy = &sysctl_intvec,
900 .extra1 = &minolduid,
901 .extra2 = &maxolduid,
902 },
903 {
904 .ctl_name = FS_OVERFLOWGID,
905 .procname = "overflowgid",
906 .data = &fs_overflowgid,
907 .maxlen = sizeof(int),
908 .mode = 0644,
909 .proc_handler = &proc_dointvec_minmax,
910 .strategy = &sysctl_intvec,
911 .extra1 = &minolduid,
912 .extra2 = &maxolduid,
913 },
914 {
915 .ctl_name = FS_LEASES,
916 .procname = "leases-enable",
917 .data = &leases_enable,
918 .maxlen = sizeof(int),
919 .mode = 0644,
920 .proc_handler = &proc_dointvec,
921 },
922#ifdef CONFIG_DNOTIFY
923 {
924 .ctl_name = FS_DIR_NOTIFY,
925 .procname = "dir-notify-enable",
926 .data = &dir_notify_enable,
927 .maxlen = sizeof(int),
928 .mode = 0644,
929 .proc_handler = &proc_dointvec,
930 },
931#endif
932#ifdef CONFIG_MMU
933 {
934 .ctl_name = FS_LEASE_TIME,
935 .procname = "lease-break-time",
936 .data = &lease_break_time,
937 .maxlen = sizeof(int),
938 .mode = 0644,
939 .proc_handler = &proc_dointvec,
940 },
941 {
942 .ctl_name = FS_AIO_NR,
943 .procname = "aio-nr",
944 .data = &aio_nr,
945 .maxlen = sizeof(aio_nr),
946 .mode = 0444,
947 .proc_handler = &proc_dointvec,
948 },
949 {
950 .ctl_name = FS_AIO_MAX_NR,
951 .procname = "aio-max-nr",
952 .data = &aio_max_nr,
953 .maxlen = sizeof(aio_max_nr),
954 .mode = 0644,
955 .proc_handler = &proc_dointvec,
956 },
0399cb08
RL		 957#ifdef CONFIG_INOTIFY
958 {
959 .ctl_name = FS_INOTIFY,
960 .procname = "inotify",
961 .mode = 0555,
962 .child = inotify_table,
963 },
964#endif
1da177e4 965#endif
d6e71144
AC		 966 {
967 .ctl_name = KERN_SETUID_DUMPABLE,
968 .procname = "suid_dumpable",
969 .data = &suid_dumpable,
970 .maxlen = sizeof(int),
971 .mode = 0644,
972 .proc_handler = &proc_dointvec,
973 },
1da177e4
LT		 974 { .ctl_name = 0 }
975};
976
977static ctl_table debug_table[] = {
978 { .ctl_name = 0 }
979};
980
981static ctl_table dev_table[] = {
982 { .ctl_name = 0 }
0eeca283 983};
1da177e4
LT		 984
985extern void init_irq_proc (void);
986
987void __init sysctl_init(void)
988{
989#ifdef CONFIG_PROC_FS
990 register_proc_table(root_table, proc_sys_root);
991 init_irq_proc();
992#endif
993}
994
995int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
996 void __user *newval, size_t newlen)
997{
998 struct list_head *tmp;
999
1000 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1001 return -ENOTDIR;
1002 if (oldval) {
1003 int old_len;
1004 if (!oldlenp || get_user(old_len, oldlenp))
1005 return -EFAULT;
1006 }
1007 tmp = &root_table_header.ctl_entry;
1008 do {
1009 struct ctl_table_header *head =
1010 list_entry(tmp, struct ctl_table_header, ctl_entry);
1011 void *context = NULL;
1012 int error = parse_table(name, nlen, oldval, oldlenp,
1013 newval, newlen, head->ctl_table,
1014 &context);
5a6b454f 1015 kfree(context);
1da177e4
LT		 1016 if (error != -ENOTDIR)
1017 return error;
1018 tmp = tmp->next;
1019 } while (tmp != &root_table_header.ctl_entry);
1020 return -ENOTDIR;
1021}
1022
1023asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1024{
1025 struct __sysctl_args tmp;
1026 int error;
1027
1028 if (copy_from_user(&tmp, args, sizeof(tmp)))
1029 return -EFAULT;
1030
1031 lock_kernel();
1032 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1033 tmp.newval, tmp.newlen);
1034 unlock_kernel();
1035 return error;
1036}
1037
1038/*
1039 * ctl_perm does NOT grant the superuser all rights automatically, because
1040 * some sysctl variables are readonly even to root.
1041 */
1042
1043static int test_perm(int mode, int op)
1044{
1045 if (!current->euid)
1046 mode >>= 6;
1047 else if (in_egroup_p(0))
1048 mode >>= 3;
1049 if ((mode & op & 0007) == op)
1050 return 0;
1051 return -EACCES;
1052}
1053
1054static inline int ctl_perm(ctl_table *table, int op)
1055{
1056 int error;
1057 error = security_sysctl(table, op);
1058 if (error)
1059 return error;
1060 return test_perm(table->mode, op);
1061}
1062
1063static int parse_table(int __user *name, int nlen,
1064 void __user *oldval, size_t __user *oldlenp,
1065 void __user *newval, size_t newlen,
1066 ctl_table *table, void **context)
1067{
1068 int n;
1069repeat:
1070 if (!nlen)
1071 return -ENOTDIR;
1072 if (get_user(n, name))
1073 return -EFAULT;
1074 for ( ; table->ctl_name; table++) {
1075 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1076 int error;
1077 if (table->child) {
1078 if (ctl_perm(table, 001))
1079 return -EPERM;
1080 if (table->strategy) {
1081 error = table->strategy(
1082 table, name, nlen,
1083 oldval, oldlenp,
1084 newval, newlen, context);
1085 if (error)
1086 return error;
1087 }
1088 name++;
1089 nlen--;
1090 table = table->child;
1091 goto repeat;
1092 }
1093 error = do_sysctl_strategy(table, name, nlen,
1094 oldval, oldlenp,
1095 newval, newlen, context);
1096 return error;
1097 }
1098 }
1099 return -ENOTDIR;
1100}
1101
1102/* Perform the actual read/write of a sysctl table entry. */
1103int do_sysctl_strategy (ctl_table *table,
1104 int __user *name, int nlen,
1105 void __user *oldval, size_t __user *oldlenp,
1106 void __user *newval, size_t newlen, void **context)
1107{
1108 int op = 0, rc;
1109 size_t len;
1110
1111 if (oldval)
1112 op |= 004;
1113 if (newval)
1114 op |= 002;
1115 if (ctl_perm(table, op))
1116 return -EPERM;
1117
1118 if (table->strategy) {
1119 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1120 newval, newlen, context);
1121 if (rc < 0)
1122 return rc;
1123 if (rc > 0)
1124 return 0;
1125 }
1126
1127 /* If there is no strategy routine, or if the strategy returns
1128 * zero, proceed with automatic r/w */
1129 if (table->data && table->maxlen) {
1130 if (oldval && oldlenp) {
1131 if (get_user(len, oldlenp))
1132 return -EFAULT;
1133 if (len) {
1134 if (len > table->maxlen)
1135 len = table->maxlen;
1136 if(copy_to_user(oldval, table->data, len))
1137 return -EFAULT;
1138 if(put_user(len, oldlenp))
1139 return -EFAULT;
1140 }
1141 }
1142 if (newval && newlen) {
1143 len = newlen;
1144 if (len > table->maxlen)
1145 len = table->maxlen;
1146 if(copy_from_user(table->data, newval, len))
1147 return -EFAULT;
1148 }
1149 }
1150 return 0;
1151}
1152
1153/**
1154 * register_sysctl_table - register a sysctl hierarchy
1155 * @table: the top-level table structure
1156 * @insert_at_head: whether the entry should be inserted in front or at the end
1157 *
1158 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1159 * array. An entry with a ctl_name of 0 terminates the table.
1160 *
1161 * The members of the &ctl_table structure are used as follows:
1162 *
1163 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1164 * must be unique within that level of sysctl
1165 *
1166 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1167 * enter a sysctl file
1168 *
1169 * data - a pointer to data for use by proc_handler
1170 *
1171 * maxlen - the maximum size in bytes of the data
1172 *
1173 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1174 *
1175 * child - a pointer to the child sysctl table if this entry is a directory, or
1176 * %NULL.
1177 *
1178 * proc_handler - the text handler routine (described below)
1179 *
1180 * strategy - the strategy routine (described below)
1181 *
1182 * de - for internal use by the sysctl routines
1183 *
1184 * extra1, extra2 - extra pointers usable by the proc handler routines
1185 *
1186 * Leaf nodes in the sysctl tree will be represented by a single file
1187 * under /proc; non-leaf nodes will be represented by directories.
1188 *
1189 * sysctl(2) can automatically manage read and write requests through
1190 * the sysctl table. The data and maxlen fields of the ctl_table
1191 * struct enable minimal validation of the values being written to be
1192 * performed, and the mode field allows minimal authentication.
1193 *
1194 * More sophisticated management can be enabled by the provision of a
1195 * strategy routine with the table entry. This will be called before
1196 * any automatic read or write of the data is performed.
1197 *
1198 * The strategy routine may return
1199 *
1200 * < 0 - Error occurred (error is passed to user process)
1201 *
1202 * 0 - OK - proceed with automatic read or write.
1203 *
1204 * > 0 - OK - read or write has been done by the strategy routine, so
1205 * return immediately.
1206 *
1207 * There must be a proc_handler routine for any terminal nodes
1208 * mirrored under /proc/sys (non-terminals are handled by a built-in
1209 * directory handler). Several default handlers are available to
1210 * cover common cases -
1211 *
1212 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1213 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1214 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1215 *
1216 * It is the handler's job to read the input buffer from user memory
1217 * and process it. The handler should return 0 on success.
1218 *
1219 * This routine returns %NULL on a failure to register, and a pointer
1220 * to the table header on success.
1221 */
1222struct ctl_table_header *register_sysctl_table(ctl_table * table,
1223 int insert_at_head)
1224{
1225 struct ctl_table_header *tmp;
1226 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1227 if (!tmp)
1228 return NULL;
1229 tmp->ctl_table = table;
1230 INIT_LIST_HEAD(&tmp->ctl_entry);
1231 if (insert_at_head)
1232 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1233 else
1234 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1235#ifdef CONFIG_PROC_FS
1236 register_proc_table(table, proc_sys_root);
1237#endif
1238 return tmp;
1239}
1240
1241/**
1242 * unregister_sysctl_table - unregister a sysctl table hierarchy
1243 * @header: the header returned from register_sysctl_table
1244 *
1245 * Unregisters the sysctl table and all children. proc entries may not
1246 * actually be removed until they are no longer used by anyone.
1247 */
1248void unregister_sysctl_table(struct ctl_table_header * header)
1249{
1250 list_del(&header->ctl_entry);
1251#ifdef CONFIG_PROC_FS
1252 unregister_proc_table(header->ctl_table, proc_sys_root);
1253#endif
1254 kfree(header);
1255}
1256
1257/*
1258 * /proc/sys support
1259 */
1260
1261#ifdef CONFIG_PROC_FS
1262
1263/* Scan the sysctl entries in table and add them all into /proc */
1264static void register_proc_table(ctl_table * table, struct proc_dir_entry *root)
1265{
1266 struct proc_dir_entry *de;
1267 int len;
1268 mode_t mode;
1269
1270 for (; table->ctl_name; table++) {
1271 /* Can't do anything without a proc name. */
1272 if (!table->procname)
1273 continue;
1274 /* Maybe we can't do anything with it... */
1275 if (!table->proc_handler && !table->child) {
1276 printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1277 table->procname);
1278 continue;
1279 }
1280
1281 len = strlen(table->procname);
1282 mode = table->mode;
1283
1284 de = NULL;
1285 if (table->proc_handler)
1286 mode |= S_IFREG;
1287 else {
1288 mode |= S_IFDIR;
1289 for (de = root->subdir; de; de = de->next) {
1290 if (proc_match(len, table->procname, de))
1291 break;
1292 }
1293 /* If the subdir exists already, de is non-NULL */
1294 }
1295
1296 if (!de) {
1297 de = create_proc_entry(table->procname, mode, root);
1298 if (!de)
1299 continue;
1300 de->data = (void *) table;
1301 if (table->proc_handler)
1302 de->proc_fops = &proc_sys_file_operations;
1303 }
1304 table->de = de;
1305 if (de->mode & S_IFDIR)
1306 register_proc_table(table->child, de);
1307 }
1308}
1309
1310/*
1311 * Unregister a /proc sysctl table and any subdirectories.
1312 */
1313static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1314{
1315 struct proc_dir_entry *de;
1316 for (; table->ctl_name; table++) {
1317 if (!(de = table->de))
1318 continue;
1319 if (de->mode & S_IFDIR) {
1320 if (!table->child) {
1321 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1322 continue;
1323 }
1324 unregister_proc_table(table->child, de);
1325
1326 /* Don't unregister directories which still have entries.. */
1327 if (de->subdir)
1328 continue;
1329 }
1330
1331 /* Don't unregister proc entries that are still being used.. */
1332 if (atomic_read(&de->count))
1333 continue;
1334
1335 table->de = NULL;
1336 remove_proc_entry(table->procname, root);
1337 }
1338}
1339
1340static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1341 size_t count, loff_t *ppos)
1342{
1343 int op;
1344 struct proc_dir_entry *de;
1345 struct ctl_table *table;
1346 size_t res;
1347 ssize_t error;
1348
1349 de = PDE(file->f_dentry->d_inode);
1350 if (!de || !de->data)
1351 return -ENOTDIR;
1352 table = (struct ctl_table *) de->data;
1353 if (!table || !table->proc_handler)
1354 return -ENOTDIR;
1355 op = (write ? 002 : 004);
1356 if (ctl_perm(table, op))
1357 return -EPERM;
1358
1359 res = count;
1360
1361 error = (*table->proc_handler) (table, write, file, buf, &res, ppos);
1362 if (error)
1363 return error;
1364 return res;
1365}
1366
1367static int proc_opensys(struct inode *inode, struct file *file)
1368{
1369 if (file->f_mode & FMODE_WRITE) {
1370 /*
1371 * sysctl entries that are not writable,
1372 * are _NOT_ writable, capabilities or not.
1373 */
1374 if (!(inode->i_mode & S_IWUSR))
1375 return -EPERM;
1376 }
1377
1378 return 0;
1379}
1380
1381static ssize_t proc_readsys(struct file * file, char __user * buf,
1382 size_t count, loff_t *ppos)
1383{
1384 return do_rw_proc(0, file, buf, count, ppos);
1385}
1386
1387static ssize_t proc_writesys(struct file * file, const char __user * buf,
1388 size_t count, loff_t *ppos)
1389{
1390 return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1391}
1392
1393/**
1394 * proc_dostring - read a string sysctl
1395 * @table: the sysctl table
1396 * @write: %TRUE if this is a write to the sysctl file
1397 * @filp: the file structure
1398 * @buffer: the user buffer
1399 * @lenp: the size of the user buffer
1400 * @ppos: file position
1401 *
1402 * Reads/writes a string from/to the user buffer. If the kernel
1403 * buffer provided is not large enough to hold the string, the
1404 * string is truncated. The copied string is %NULL-terminated.
1405 * If the string is being read by the user process, it is copied
1406 * and a newline '\n' is added. It is truncated if the buffer is
1407 * not large enough.
1408 *
1409 * Returns 0 on success.
1410 */
1411int proc_dostring(ctl_table *table, int write, struct file *filp,
1412 void __user *buffer, size_t *lenp, loff_t *ppos)
1413{
1414 size_t len;
1415 char __user *p;
1416 char c;
1417
1418 if (!table->data || !table->maxlen || !*lenp ||
1419 (*ppos && !write)) {
1420 *lenp = 0;
1421 return 0;
1422 }
1423
1424 if (write) {
1425 len = 0;
1426 p = buffer;
1427 while (len < *lenp) {
1428 if (get_user(c, p++))
1429 return -EFAULT;
1430 if (c == 0 || c == '\n')
1431 break;
1432 len++;
1433 }
1434 if (len >= table->maxlen)
1435 len = table->maxlen-1;
1436 if(copy_from_user(table->data, buffer, len))
1437 return -EFAULT;
1438 ((char *) table->data)[len] = 0;
1439 *ppos += *lenp;
1440 } else {
1441 len = strlen(table->data);
1442 if (len > table->maxlen)
1443 len = table->maxlen;
1444 if (len > *lenp)
1445 len = *lenp;
1446 if (len)
1447 if(copy_to_user(buffer, table->data, len))
1448 return -EFAULT;
1449 if (len < *lenp) {
1450 if(put_user('\n', ((char __user *) buffer) + len))
1451 return -EFAULT;
1452 len++;
1453 }
1454 *lenp = len;
1455 *ppos += len;
1456 }
1457 return 0;
1458}
1459
1460/*
1461 * Special case of dostring for the UTS structure. This has locks
1462 * to observe. Should this be in kernel/sys.c ????
1463 */
1464
1465static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1466 void __user *buffer, size_t *lenp, loff_t *ppos)
1467{
1468 int r;
1469
1470 if (!write) {
1471 down_read(&uts_sem);
1472 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1473 up_read(&uts_sem);
1474 } else {
1475 down_write(&uts_sem);
1476 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1477 up_write(&uts_sem);
1478 }
1479 return r;
1480}
1481
1482static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1483 int *valp,
1484 int write, void *data)
1485{
1486 if (write) {
1487 *valp = *negp ? -*lvalp : *lvalp;
1488 } else {
1489 int val = *valp;
1490 if (val < 0) {
1491 *negp = -1;
1492 *lvalp = (unsigned long)-val;
1493 } else {
1494 *negp = 0;
1495 *lvalp = (unsigned long)val;
1496 }
1497 }
1498 return 0;
1499}
1500
1501static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1502 void __user *buffer, size_t *lenp, loff_t *ppos,
1503 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1504 int write, void *data),
1505 void *data)
1506{
1507#define TMPBUFLEN 21
1508 int *i, vleft, first=1, neg, val;
1509 unsigned long lval;
1510 size_t left, len;
1511
1512 char buf[TMPBUFLEN], *p;
1513 char __user *s = buffer;
1514
1515 if (!table->data || !table->maxlen || !*lenp ||
1516 (*ppos && !write)) {
1517 *lenp = 0;
1518 return 0;
1519 }
1520
1521 i = (int *) table->data;
1522 vleft = table->maxlen / sizeof(*i);
1523 left = *lenp;
1524
1525 if (!conv)
1526 conv = do_proc_dointvec_conv;
1527
1528 for (; left && vleft--; i++, first=0) {
1529 if (write) {
1530 while (left) {
1531 char c;
1532 if (get_user(c, s))
1533 return -EFAULT;
1534 if (!isspace(c))
1535 break;
1536 left--;
1537 s++;
1538 }
1539 if (!left)
1540 break;
1541 neg = 0;
1542 len = left;
1543 if (len > sizeof(buf) - 1)
1544 len = sizeof(buf) - 1;
1545 if (copy_from_user(buf, s, len))
1546 return -EFAULT;
1547 buf[len] = 0;
1548 p = buf;
1549 if (*p == '-' && left > 1) {
1550 neg = 1;
1551 left--, p++;
1552 }
1553 if (*p < '0' || *p > '9')
1554 break;
1555
1556 lval = simple_strtoul(p, &p, 0);
1557
1558 len = p-buf;
1559 if ((len < left) && *p && !isspace(*p))
1560 break;
1561 if (neg)
1562 val = -val;
1563 s += len;
1564 left -= len;
1565
1566 if (conv(&neg, &lval, i, 1, data))
1567 break;
1568 } else {
1569 p = buf;
1570 if (!first)
1571 *p++ = '\t';
1572
1573 if (conv(&neg, &lval, i, 0, data))
1574 break;
1575
1576 sprintf(p, "%s%lu", neg ? "-" : "", lval);
1577 len = strlen(buf);
1578 if (len > left)
1579 len = left;
1580 if(copy_to_user(s, buf, len))
1581 return -EFAULT;
1582 left -= len;
1583 s += len;
1584 }
1585 }
1586
1587 if (!write && !first && left) {
1588 if(put_user('\n', s))
1589 return -EFAULT;
1590 left--, s++;
1591 }
1592 if (write) {
1593 while (left) {
1594 char c;
1595 if (get_user(c, s++))
1596 return -EFAULT;
1597 if (!isspace(c))
1598 break;
1599 left--;
1600 }
1601 }
1602 if (write && first)
1603 return -EINVAL;
1604 *lenp -= left;
1605 *ppos += *lenp;
1606 return 0;
1607#undef TMPBUFLEN
1608}
1609
1610/**
1611 * proc_dointvec - read a vector of integers
1612 * @table: the sysctl table
1613 * @write: %TRUE if this is a write to the sysctl file
1614 * @filp: the file structure
1615 * @buffer: the user buffer
1616 * @lenp: the size of the user buffer
1617 * @ppos: file position
1618 *
1619 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1620 * values from/to the user buffer, treated as an ASCII string.
1621 *
1622 * Returns 0 on success.
1623 */
1624int proc_dointvec(ctl_table *table, int write, struct file *filp,
1625 void __user *buffer, size_t *lenp, loff_t *ppos)
1626{
1627 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1628 NULL,NULL);
1629}
1630
1631#define OP_SET 0
1632#define OP_AND 1
1633#define OP_OR 2
1634#define OP_MAX 3
1635#define OP_MIN 4
1636
1637static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1638 int *valp,
1639 int write, void *data)
1640{
1641 int op = *(int *)data;
1642 if (write) {
1643 int val = *negp ? -*lvalp : *lvalp;
1644 switch(op) {
1645 case OP_SET: *valp = val; break;
1646 case OP_AND: *valp &= val; break;
1647 case OP_OR: *valp |= val; break;
1648 case OP_MAX: if(*valp < val)
1649 *valp = val;
1650 break;
1651 case OP_MIN: if(*valp > val)
1652 *valp = val;
1653 break;
1654 }
1655 } else {
1656 int val = *valp;
1657 if (val < 0) {
1658 *negp = -1;
1659 *lvalp = (unsigned long)-val;
1660 } else {
1661 *negp = 0;
1662 *lvalp = (unsigned long)val;
1663 }
1664 }
1665 return 0;
1666}
1667
1668/*
1669 * init may raise the set.
1670 */
1671
1672int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1673 void __user *buffer, size_t *lenp, loff_t *ppos)
1674{
1675 int op;
1676
1677 if (!capable(CAP_SYS_MODULE)) {
1678 return -EPERM;
1679 }
1680
1681 op = (current->pid == 1) ? OP_SET : OP_AND;
1682 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1683 do_proc_dointvec_bset_conv,&op);
1684}
1685
1686struct do_proc_dointvec_minmax_conv_param {
1687 int *min;
1688 int *max;
1689};
1690
1691static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1692 int *valp,
1693 int write, void *data)
1694{
1695 struct do_proc_dointvec_minmax_conv_param *param = data;
1696 if (write) {
1697 int val = *negp ? -*lvalp : *lvalp;
1698 if ((param->min && *param->min > val) ||
1699 (param->max && *param->max < val))
1700 return -EINVAL;
1701 *valp = val;
1702 } else {
1703 int val = *valp;
1704 if (val < 0) {
1705 *negp = -1;
1706 *lvalp = (unsigned long)-val;
1707 } else {
1708 *negp = 0;
1709 *lvalp = (unsigned long)val;
1710 }
1711 }
1712 return 0;
1713}
1714
1715/**
1716 * proc_dointvec_minmax - read a vector of integers with min/max values
1717 * @table: the sysctl table
1718 * @write: %TRUE if this is a write to the sysctl file
1719 * @filp: the file structure
1720 * @buffer: the user buffer
1721 * @lenp: the size of the user buffer
1722 * @ppos: file position
1723 *
1724 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1725 * values from/to the user buffer, treated as an ASCII string.
1726 *
1727 * This routine will ensure the values are within the range specified by
1728 * table->extra1 (min) and table->extra2 (max).
1729 *
1730 * Returns 0 on success.
1731 */
1732int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1733 void __user *buffer, size_t *lenp, loff_t *ppos)
1734{
1735 struct do_proc_dointvec_minmax_conv_param param = {
1736 .min = (int *) table->extra1,
1737 .max = (int *) table->extra2,
1738 };
1739 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1740 do_proc_dointvec_minmax_conv, &param);
1741}
1742
1743static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1744 struct file *filp,
1745 void __user *buffer,
1746 size_t *lenp, loff_t *ppos,
1747 unsigned long convmul,
1748 unsigned long convdiv)
1749{
1750#define TMPBUFLEN 21
1751 unsigned long *i, *min, *max, val;
1752 int vleft, first=1, neg;
1753 size_t len, left;
1754 char buf[TMPBUFLEN], *p;
1755 char __user *s = buffer;
1756
1757 if (!table->data || !table->maxlen || !*lenp ||
1758 (*ppos && !write)) {
1759 *lenp = 0;
1760 return 0;
1761 }
1762
1763 i = (unsigned long *) table->data;
1764 min = (unsigned long *) table->extra1;
1765 max = (unsigned long *) table->extra2;
1766 vleft = table->maxlen / sizeof(unsigned long);
1767 left = *lenp;
1768
1769 for (; left && vleft--; i++, min++, max++, first=0) {
1770 if (write) {
1771 while (left) {
1772 char c;
1773 if (get_user(c, s))
1774 return -EFAULT;
1775 if (!isspace(c))
1776 break;
1777 left--;
1778 s++;
1779 }
1780 if (!left)
1781 break;
1782 neg = 0;
1783 len = left;
1784 if (len > TMPBUFLEN-1)
1785 len = TMPBUFLEN-1;
1786 if (copy_from_user(buf, s, len))
1787 return -EFAULT;
1788 buf[len] = 0;
1789 p = buf;
1790 if (*p == '-' && left > 1) {
1791 neg = 1;
1792 left--, p++;
1793 }
1794 if (*p < '0' || *p > '9')
1795 break;
1796 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1797 len = p-buf;
1798 if ((len < left) && *p && !isspace(*p))
1799 break;
1800 if (neg)
1801 val = -val;
1802 s += len;
1803 left -= len;
1804
1805 if(neg)
1806 continue;
1807 if ((min && val < *min) || (max && val > *max))
1808 continue;
1809 *i = val;
1810 } else {
1811 p = buf;
1812 if (!first)
1813 *p++ = '\t';
1814 sprintf(p, "%lu", convdiv * (*i) / convmul);
1815 len = strlen(buf);
1816 if (len > left)
1817 len = left;
1818 if(copy_to_user(s, buf, len))
1819 return -EFAULT;
1820 left -= len;
1821 s += len;
1822 }
1823 }
1824
1825 if (!write && !first && left) {
1826 if(put_user('\n', s))
1827 return -EFAULT;
1828 left--, s++;
1829 }
1830 if (write) {
1831 while (left) {
1832 char c;
1833 if (get_user(c, s++))
1834 return -EFAULT;
1835 if (!isspace(c))
1836 break;
1837 left--;
1838 }
1839 }
1840 if (write && first)
1841 return -EINVAL;
1842 *lenp -= left;
1843 *ppos += *lenp;
1844 return 0;
1845#undef TMPBUFLEN
1846}
1847
1848/**
1849 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1850 * @table: the sysctl table
1851 * @write: %TRUE if this is a write to the sysctl file
1852 * @filp: the file structure
1853 * @buffer: the user buffer
1854 * @lenp: the size of the user buffer
1855 * @ppos: file position
1856 *
1857 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1858 * values from/to the user buffer, treated as an ASCII string.
1859 *
1860 * This routine will ensure the values are within the range specified by
1861 * table->extra1 (min) and table->extra2 (max).
1862 *
1863 * Returns 0 on success.
1864 */
1865int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
1866 void __user *buffer, size_t *lenp, loff_t *ppos)
1867{
1868 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
1869}
1870
1871/**
1872 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1873 * @table: the sysctl table
1874 * @write: %TRUE if this is a write to the sysctl file
1875 * @filp: the file structure
1876 * @buffer: the user buffer
1877 * @lenp: the size of the user buffer
1878 * @ppos: file position
1879 *
1880 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1881 * values from/to the user buffer, treated as an ASCII string. The values
1882 * are treated as milliseconds, and converted to jiffies when they are stored.
1883 *
1884 * This routine will ensure the values are within the range specified by
1885 * table->extra1 (min) and table->extra2 (max).
1886 *
1887 * Returns 0 on success.
1888 */
1889int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
1890 struct file *filp,
1891 void __user *buffer,
1892 size_t *lenp, loff_t *ppos)
1893{
1894 return do_proc_doulongvec_minmax(table, write, filp, buffer,
1895 lenp, ppos, HZ, 1000l);
1896}
1897
1898
1899static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
1900 int *valp,
1901 int write, void *data)
1902{
1903 if (write) {
1904 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1905 } else {
1906 int val = *valp;
1907 unsigned long lval;
1908 if (val < 0) {
1909 *negp = -1;
1910 lval = (unsigned long)-val;
1911 } else {
1912 *negp = 0;
1913 lval = (unsigned long)val;
1914 }
1915 *lvalp = lval / HZ;
1916 }
1917 return 0;
1918}
1919
1920static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
1921 int *valp,
1922 int write, void *data)
1923{
1924 if (write) {
1925 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1926 } else {
1927 int val = *valp;
1928 unsigned long lval;
1929 if (val < 0) {
1930 *negp = -1;
1931 lval = (unsigned long)-val;
1932 } else {
1933 *negp = 0;
1934 lval = (unsigned long)val;
1935 }
1936 *lvalp = jiffies_to_clock_t(lval);
1937 }
1938 return 0;
1939}
1940
1941static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
1942 int *valp,
1943 int write, void *data)
1944{
1945 if (write) {
1946 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1947 } else {
1948 int val = *valp;
1949 unsigned long lval;
1950 if (val < 0) {
1951 *negp = -1;
1952 lval = (unsigned long)-val;
1953 } else {
1954 *negp = 0;
1955 lval = (unsigned long)val;
1956 }
1957 *lvalp = jiffies_to_msecs(lval);
1958 }
1959 return 0;
1960}
1961
1962/**
1963 * proc_dointvec_jiffies - read a vector of integers as seconds
1964 * @table: the sysctl table
1965 * @write: %TRUE if this is a write to the sysctl file
1966 * @filp: the file structure
1967 * @buffer: the user buffer
1968 * @lenp: the size of the user buffer
1969 * @ppos: file position
1970 *
1971 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1972 * values from/to the user buffer, treated as an ASCII string.
1973 * The values read are assumed to be in seconds, and are converted into
1974 * jiffies.
1975 *
1976 * Returns 0 on success.
1977 */
1978int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
1979 void __user *buffer, size_t *lenp, loff_t *ppos)
1980{
1981 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1982 do_proc_dointvec_jiffies_conv,NULL);
1983}
1984
1985/**
1986 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1987 * @table: the sysctl table
1988 * @write: %TRUE if this is a write to the sysctl file
1989 * @filp: the file structure
1990 * @buffer: the user buffer
1991 * @lenp: the size of the user buffer
1992 *
1993 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1994 * values from/to the user buffer, treated as an ASCII string.
1995 * The values read are assumed to be in 1/USER_HZ seconds, and
1996 * are converted into jiffies.
1997 *
1998 * Returns 0 on success.
1999 */
2000int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2001 void __user *buffer, size_t *lenp, loff_t *ppos)
2002{
2003 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2004 do_proc_dointvec_userhz_jiffies_conv,NULL);
2005}
2006
2007/**
2008 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2009 * @table: the sysctl table
2010 * @write: %TRUE if this is a write to the sysctl file
2011 * @filp: the file structure
2012 * @buffer: the user buffer
2013 * @lenp: the size of the user buffer
67be2dd1
MW		 2014 * @ppos: file position
2015 * @ppos: the current position in the file
1da177e4
LT		 2016 *
2017 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2018 * values from/to the user buffer, treated as an ASCII string.
2019 * The values read are assumed to be in 1/1000 seconds, and
2020 * are converted into jiffies.
2021 *
2022 * Returns 0 on success.
2023 */
2024int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2025 void __user *buffer, size_t *lenp, loff_t *ppos)
2026{
2027 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2028 do_proc_dointvec_ms_jiffies_conv, NULL);
2029}
2030
2031#else /* CONFIG_PROC_FS */
2032
2033int proc_dostring(ctl_table *table, int write, struct file *filp,
2034 void __user *buffer, size_t *lenp, loff_t *ppos)
2035{
2036 return -ENOSYS;
2037}
2038
2039static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2040 void __user *buffer, size_t *lenp, loff_t *ppos)
2041{
2042 return -ENOSYS;
2043}
2044
2045int proc_dointvec(ctl_table *table, int write, struct file *filp,
2046 void __user *buffer, size_t *lenp, loff_t *ppos)
2047{
2048 return -ENOSYS;
2049}
2050
2051int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2052 void __user *buffer, size_t *lenp, loff_t *ppos)
2053{
2054 return -ENOSYS;
2055}
2056
2057int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2058 void __user *buffer, size_t *lenp, loff_t *ppos)
2059{
2060 return -ENOSYS;
2061}
2062
2063int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2064 void __user *buffer, size_t *lenp, loff_t *ppos)
2065{
2066 return -ENOSYS;
2067}
2068
2069int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2070 void __user *buffer, size_t *lenp, loff_t *ppos)
2071{
2072 return -ENOSYS;
2073}
2074
2075int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2076 void __user *buffer, size_t *lenp, loff_t *ppos)
2077{
2078 return -ENOSYS;
2079}
2080
2081int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2082 void __user *buffer, size_t *lenp, loff_t *ppos)
2083{
2084 return -ENOSYS;
2085}
2086
2087int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2088 struct file *filp,
2089 void __user *buffer,
2090 size_t *lenp, loff_t *ppos)
2091{
2092 return -ENOSYS;
2093}
2094
2095
2096#endif /* CONFIG_PROC_FS */
2097
2098
2099/*
2100 * General sysctl support routines
2101 */
2102
2103/* The generic string strategy routine: */
2104int sysctl_string(ctl_table *table, int __user *name, int nlen,
2105 void __user *oldval, size_t __user *oldlenp,
2106 void __user *newval, size_t newlen, void **context)
2107{
2108 size_t l, len;
2109
2110 if (!table->data || !table->maxlen)
2111 return -ENOTDIR;
2112
2113 if (oldval && oldlenp) {
2114 if (get_user(len, oldlenp))
2115 return -EFAULT;
2116 if (len) {
2117 l = strlen(table->data);
2118 if (len > l) len = l;
2119 if (len >= table->maxlen)
2120 len = table->maxlen;
2121 if(copy_to_user(oldval, table->data, len))
2122 return -EFAULT;
2123 if(put_user(0, ((char __user *) oldval) + len))
2124 return -EFAULT;
2125 if(put_user(len, oldlenp))
2126 return -EFAULT;
2127 }
2128 }
2129 if (newval && newlen) {
2130 len = newlen;
2131 if (len > table->maxlen)
2132 len = table->maxlen;
2133 if(copy_from_user(table->data, newval, len))
2134 return -EFAULT;
2135 if (len == table->maxlen)
2136 len--;
2137 ((char *) table->data)[len] = 0;
2138 }
2139 return 0;
2140}
2141
2142/*
2143 * This function makes sure that all of the integers in the vector
2144 * are between the minimum and maximum values given in the arrays
2145 * table->extra1 and table->extra2, respectively.
2146 */
2147int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2148 void __user *oldval, size_t __user *oldlenp,
2149 void __user *newval, size_t newlen, void **context)
2150{
2151
2152 if (newval && newlen) {
2153 int __user *vec = (int __user *) newval;
2154 int *min = (int *) table->extra1;
2155 int *max = (int *) table->extra2;
2156 size_t length;
2157 int i;
2158
2159 if (newlen % sizeof(int) != 0)
2160 return -EINVAL;
2161
2162 if (!table->extra1 && !table->extra2)
2163 return 0;
2164
2165 if (newlen > table->maxlen)
2166 newlen = table->maxlen;
2167 length = newlen / sizeof(int);
2168
2169 for (i = 0; i < length; i++) {
2170 int value;
2171 if (get_user(value, vec + i))
2172 return -EFAULT;
2173 if (min && value < min[i])
2174 return -EINVAL;
2175 if (max && value > max[i])
2176 return -EINVAL;
2177 }
2178 }
2179 return 0;
2180}
2181
2182/* Strategy function to convert jiffies to seconds */
2183int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2184 void __user *oldval, size_t __user *oldlenp,
2185 void __user *newval, size_t newlen, void **context)
2186{
2187 if (oldval) {
2188 size_t olen;
2189 if (oldlenp) {
2190 if (get_user(olen, oldlenp))
2191 return -EFAULT;
2192 if (olen!=sizeof(int))
2193 return -EINVAL;
2194 }
2195 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2196 (oldlenp && put_user(sizeof(int),oldlenp)))
2197 return -EFAULT;
2198 }
2199 if (newval && newlen) {
2200 int new;
2201 if (newlen != sizeof(int))
2202 return -EINVAL;
2203 if (get_user(new, (int __user *)newval))
2204 return -EFAULT;
2205 *(int *)(table->data) = new*HZ;
2206 }
2207 return 1;
2208}
2209
2210/* Strategy function to convert jiffies to seconds */
2211int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2212 void __user *oldval, size_t __user *oldlenp,
2213 void __user *newval, size_t newlen, void **context)
2214{
2215 if (oldval) {
2216 size_t olen;
2217 if (oldlenp) {
2218 if (get_user(olen, oldlenp))
2219 return -EFAULT;
2220 if (olen!=sizeof(int))
2221 return -EINVAL;
2222 }
2223 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2224 (oldlenp && put_user(sizeof(int),oldlenp)))
2225 return -EFAULT;
2226 }
2227 if (newval && newlen) {
2228 int new;
2229 if (newlen != sizeof(int))
2230 return -EINVAL;
2231 if (get_user(new, (int __user *)newval))
2232 return -EFAULT;
2233 *(int *)(table->data) = msecs_to_jiffies(new);
2234 }
2235 return 1;
2236}
2237
2238#else /* CONFIG_SYSCTL */
2239
2240
2241asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2242{
2243 return -ENOSYS;
2244}
2245
2246int sysctl_string(ctl_table *table, int __user *name, int nlen,
2247 void __user *oldval, size_t __user *oldlenp,
2248 void __user *newval, size_t newlen, void **context)
2249{
2250 return -ENOSYS;
2251}
2252
2253int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2254 void __user *oldval, size_t __user *oldlenp,
2255 void __user *newval, size_t newlen, void **context)
2256{
2257 return -ENOSYS;
2258}
2259
2260int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2261 void __user *oldval, size_t __user *oldlenp,
2262 void __user *newval, size_t newlen, void **context)
2263{
2264 return -ENOSYS;
2265}
2266
2267int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2268 void __user *oldval, size_t __user *oldlenp,
2269 void __user *newval, size_t newlen, void **context)
2270{
2271 return -ENOSYS;
2272}
2273
2274int proc_dostring(ctl_table *table, int write, struct file *filp,
2275 void __user *buffer, size_t *lenp, loff_t *ppos)
2276{
2277 return -ENOSYS;
2278}
2279
2280int proc_dointvec(ctl_table *table, int write, struct file *filp,
2281 void __user *buffer, size_t *lenp, loff_t *ppos)
2282{
2283 return -ENOSYS;
2284}
2285
2286int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2287 void __user *buffer, size_t *lenp, loff_t *ppos)
2288{
2289 return -ENOSYS;
2290}
2291
2292int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2293 void __user *buffer, size_t *lenp, loff_t *ppos)
2294{
2295 return -ENOSYS;
2296}
2297
2298int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2299 void __user *buffer, size_t *lenp, loff_t *ppos)
2300{
2301 return -ENOSYS;
2302}
2303
2304int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2305 void __user *buffer, size_t *lenp, loff_t *ppos)
2306{
2307 return -ENOSYS;
2308}
2309
2310int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2311 void __user *buffer, size_t *lenp, loff_t *ppos)
2312{
2313 return -ENOSYS;
2314}
2315
2316int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2317 void __user *buffer, size_t *lenp, loff_t *ppos)
2318{
2319 return -ENOSYS;
2320}
2321
2322int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2323 struct file *filp,
2324 void __user *buffer,
2325 size_t *lenp, loff_t *ppos)
2326{
2327 return -ENOSYS;
2328}
2329
2330struct ctl_table_header * register_sysctl_table(ctl_table * table,
2331 int insert_at_head)
2332{
2333 return NULL;
2334}
2335
2336void unregister_sysctl_table(struct ctl_table_header * table)
2337{
2338}
2339
2340#endif /* CONFIG_SYSCTL */
2341
2342/*
2343 * No sense putting this after each symbol definition, twice,
2344 * exception granted :-)
2345 */
2346EXPORT_SYMBOL(proc_dointvec);
2347EXPORT_SYMBOL(proc_dointvec_jiffies);
2348EXPORT_SYMBOL(proc_dointvec_minmax);
2349EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2350EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2351EXPORT_SYMBOL(proc_dostring);
2352EXPORT_SYMBOL(proc_doulongvec_minmax);
2353EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2354EXPORT_SYMBOL(register_sysctl_table);
2355EXPORT_SYMBOL(sysctl_intvec);
2356EXPORT_SYMBOL(sysctl_jiffies);
2357EXPORT_SYMBOL(sysctl_ms_jiffies);
2358EXPORT_SYMBOL(sysctl_string);
2359EXPORT_SYMBOL(unregister_sysctl_table);
Linux 6.x block layer and io_uring tree(s)