2 * sysctl.c: General linux system control interface
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
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
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
21 #include <linux/module.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/signal.h>
27 #include <linux/printk.h>
28 #include <linux/proc_fs.h>
29 #include <linux/security.h>
30 #include <linux/ctype.h>
31 #include <linux/kmemcheck.h>
33 #include <linux/init.h>
34 #include <linux/kernel.h>
35 #include <linux/kobject.h>
36 #include <linux/net.h>
37 #include <linux/sysrq.h>
38 #include <linux/highuid.h>
39 #include <linux/writeback.h>
40 #include <linux/ratelimit.h>
41 #include <linux/compaction.h>
42 #include <linux/hugetlb.h>
43 #include <linux/initrd.h>
44 #include <linux/key.h>
45 #include <linux/times.h>
46 #include <linux/limits.h>
47 #include <linux/dcache.h>
48 #include <linux/dnotify.h>
49 #include <linux/syscalls.h>
50 #include <linux/vmstat.h>
51 #include <linux/nfs_fs.h>
52 #include <linux/acpi.h>
53 #include <linux/reboot.h>
54 #include <linux/ftrace.h>
55 #include <linux/perf_event.h>
56 #include <linux/kprobes.h>
57 #include <linux/pipe_fs_i.h>
58 #include <linux/oom.h>
59 #include <linux/kmod.h>
60 #include <linux/capability.h>
62 #include <asm/uaccess.h>
63 #include <asm/processor.h>
67 #include <asm/stacktrace.h>
70 #ifdef CONFIG_BSD_PROCESS_ACCT
71 #include <linux/acct.h>
73 #ifdef CONFIG_RT_MUTEXES
74 #include <linux/rtmutex.h>
76 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
77 #include <linux/lockdep.h>
79 #ifdef CONFIG_CHR_DEV_SG
83 #ifdef CONFIG_LOCKUP_DETECTOR
84 #include <linux/nmi.h>
88 #if defined(CONFIG_SYSCTL)
90 /* External variables not in a header file. */
91 extern int sysctl_overcommit_memory;
92 extern int sysctl_overcommit_ratio;
93 extern int max_threads;
94 extern int core_uses_pid;
95 extern int suid_dumpable;
96 extern char core_pattern[];
97 extern unsigned int core_pipe_limit;
99 extern int min_free_kbytes;
100 extern int pid_max_min, pid_max_max;
101 extern int sysctl_drop_caches;
102 extern int percpu_pagelist_fraction;
103 extern int compat_log;
104 extern int latencytop_enabled;
105 extern int sysctl_nr_open_min, sysctl_nr_open_max;
107 extern int sysctl_nr_trim_pages;
110 extern int blk_iopoll_enabled;
113 /* Constants used for minimum and maximum */
114 #ifdef CONFIG_LOCKUP_DETECTOR
115 static int sixty = 60;
116 static int neg_one = -1;
120 static int __maybe_unused one = 1;
121 static int __maybe_unused two = 2;
122 static int __maybe_unused three = 3;
123 static unsigned long one_ul = 1;
124 static int one_hundred = 100;
126 static int ten_thousand = 10000;
129 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
130 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
132 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
133 static int maxolduid = 65535;
134 static int minolduid;
135 static int min_percpu_pagelist_fract = 8;
137 static int ngroups_max = NGROUPS_MAX;
138 static const int cap_last_cap = CAP_LAST_CAP;
140 #ifdef CONFIG_INOTIFY_USER
141 #include <linux/inotify.h>
144 #include <asm/system.h>
147 #ifdef CONFIG_SPARC64
148 extern int sysctl_tsb_ratio;
152 extern int pwrsw_enabled;
153 extern int unaligned_enabled;
157 extern int no_unaligned_warning;
158 extern int unaligned_dump_stack;
161 #ifdef CONFIG_PROC_SYSCTL
162 static int proc_do_cad_pid(struct ctl_table *table, int write,
163 void __user *buffer, size_t *lenp, loff_t *ppos);
164 static int proc_taint(struct ctl_table *table, int write,
165 void __user *buffer, size_t *lenp, loff_t *ppos);
169 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
170 void __user *buffer, size_t *lenp, loff_t *ppos);
173 #ifdef CONFIG_MAGIC_SYSRQ
174 /* Note: sysrq code uses it's own private copy */
175 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
177 static int sysrq_sysctl_handler(ctl_table *table, int write,
178 void __user *buffer, size_t *lenp,
183 error = proc_dointvec(table, write, buffer, lenp, ppos);
188 sysrq_toggle_support(__sysrq_enabled);
195 static struct ctl_table root_table[];
196 static struct ctl_table_root sysctl_table_root;
197 static struct ctl_table_header root_table_header = {
199 .ctl_table = root_table,
200 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}},
201 .root = &sysctl_table_root,
202 .set = &sysctl_table_root.default_set,
204 static struct ctl_table_root sysctl_table_root = {
205 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
206 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
209 static struct ctl_table kern_table[];
210 static struct ctl_table vm_table[];
211 static struct ctl_table fs_table[];
212 static struct ctl_table debug_table[];
213 static struct ctl_table dev_table[];
214 extern struct ctl_table random_table[];
216 extern struct ctl_table epoll_table[];
219 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
220 int sysctl_legacy_va_layout;
223 /* The default sysctl tables: */
225 static struct ctl_table root_table[] = {
227 .procname = "kernel",
244 .child = debug_table,
254 #ifdef CONFIG_SCHED_DEBUG
255 static int min_sched_granularity_ns = 100000; /* 100 usecs */
256 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
257 static int min_wakeup_granularity_ns; /* 0 usecs */
258 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
259 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
260 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
263 #ifdef CONFIG_COMPACTION
264 static int min_extfrag_threshold;
265 static int max_extfrag_threshold = 1000;
268 static struct ctl_table kern_table[] = {
270 .procname = "sched_child_runs_first",
271 .data = &sysctl_sched_child_runs_first,
272 .maxlen = sizeof(unsigned int),
274 .proc_handler = proc_dointvec,
276 #ifdef CONFIG_SCHED_DEBUG
278 .procname = "sched_min_granularity_ns",
279 .data = &sysctl_sched_min_granularity,
280 .maxlen = sizeof(unsigned int),
282 .proc_handler = sched_proc_update_handler,
283 .extra1 = &min_sched_granularity_ns,
284 .extra2 = &max_sched_granularity_ns,
287 .procname = "sched_latency_ns",
288 .data = &sysctl_sched_latency,
289 .maxlen = sizeof(unsigned int),
291 .proc_handler = sched_proc_update_handler,
292 .extra1 = &min_sched_granularity_ns,
293 .extra2 = &max_sched_granularity_ns,
296 .procname = "sched_wakeup_granularity_ns",
297 .data = &sysctl_sched_wakeup_granularity,
298 .maxlen = sizeof(unsigned int),
300 .proc_handler = sched_proc_update_handler,
301 .extra1 = &min_wakeup_granularity_ns,
302 .extra2 = &max_wakeup_granularity_ns,
305 .procname = "sched_tunable_scaling",
306 .data = &sysctl_sched_tunable_scaling,
307 .maxlen = sizeof(enum sched_tunable_scaling),
309 .proc_handler = sched_proc_update_handler,
310 .extra1 = &min_sched_tunable_scaling,
311 .extra2 = &max_sched_tunable_scaling,
314 .procname = "sched_migration_cost",
315 .data = &sysctl_sched_migration_cost,
316 .maxlen = sizeof(unsigned int),
318 .proc_handler = proc_dointvec,
321 .procname = "sched_nr_migrate",
322 .data = &sysctl_sched_nr_migrate,
323 .maxlen = sizeof(unsigned int),
325 .proc_handler = proc_dointvec,
328 .procname = "sched_time_avg",
329 .data = &sysctl_sched_time_avg,
330 .maxlen = sizeof(unsigned int),
332 .proc_handler = proc_dointvec_minmax,
336 .procname = "sched_shares_window",
337 .data = &sysctl_sched_shares_window,
338 .maxlen = sizeof(unsigned int),
340 .proc_handler = proc_dointvec,
343 .procname = "timer_migration",
344 .data = &sysctl_timer_migration,
345 .maxlen = sizeof(unsigned int),
347 .proc_handler = proc_dointvec_minmax,
353 .procname = "sched_rt_period_us",
354 .data = &sysctl_sched_rt_period,
355 .maxlen = sizeof(unsigned int),
357 .proc_handler = sched_rt_handler,
360 .procname = "sched_rt_runtime_us",
361 .data = &sysctl_sched_rt_runtime,
362 .maxlen = sizeof(int),
364 .proc_handler = sched_rt_handler,
366 #ifdef CONFIG_SCHED_AUTOGROUP
368 .procname = "sched_autogroup_enabled",
369 .data = &sysctl_sched_autogroup_enabled,
370 .maxlen = sizeof(unsigned int),
372 .proc_handler = proc_dointvec_minmax,
377 #ifdef CONFIG_CFS_BANDWIDTH
379 .procname = "sched_cfs_bandwidth_slice_us",
380 .data = &sysctl_sched_cfs_bandwidth_slice,
381 .maxlen = sizeof(unsigned int),
383 .proc_handler = proc_dointvec_minmax,
387 #ifdef CONFIG_PROVE_LOCKING
389 .procname = "prove_locking",
390 .data = &prove_locking,
391 .maxlen = sizeof(int),
393 .proc_handler = proc_dointvec,
396 #ifdef CONFIG_LOCK_STAT
398 .procname = "lock_stat",
400 .maxlen = sizeof(int),
402 .proc_handler = proc_dointvec,
407 .data = &panic_timeout,
408 .maxlen = sizeof(int),
410 .proc_handler = proc_dointvec,
413 .procname = "core_uses_pid",
414 .data = &core_uses_pid,
415 .maxlen = sizeof(int),
417 .proc_handler = proc_dointvec,
420 .procname = "core_pattern",
421 .data = core_pattern,
422 .maxlen = CORENAME_MAX_SIZE,
424 .proc_handler = proc_dostring,
427 .procname = "core_pipe_limit",
428 .data = &core_pipe_limit,
429 .maxlen = sizeof(unsigned int),
431 .proc_handler = proc_dointvec,
433 #ifdef CONFIG_PROC_SYSCTL
435 .procname = "tainted",
436 .maxlen = sizeof(long),
438 .proc_handler = proc_taint,
441 #ifdef CONFIG_LATENCYTOP
443 .procname = "latencytop",
444 .data = &latencytop_enabled,
445 .maxlen = sizeof(int),
447 .proc_handler = proc_dointvec,
450 #ifdef CONFIG_BLK_DEV_INITRD
452 .procname = "real-root-dev",
453 .data = &real_root_dev,
454 .maxlen = sizeof(int),
456 .proc_handler = proc_dointvec,
460 .procname = "print-fatal-signals",
461 .data = &print_fatal_signals,
462 .maxlen = sizeof(int),
464 .proc_handler = proc_dointvec,
468 .procname = "reboot-cmd",
469 .data = reboot_command,
472 .proc_handler = proc_dostring,
475 .procname = "stop-a",
476 .data = &stop_a_enabled,
477 .maxlen = sizeof (int),
479 .proc_handler = proc_dointvec,
482 .procname = "scons-poweroff",
483 .data = &scons_pwroff,
484 .maxlen = sizeof (int),
486 .proc_handler = proc_dointvec,
489 #ifdef CONFIG_SPARC64
491 .procname = "tsb-ratio",
492 .data = &sysctl_tsb_ratio,
493 .maxlen = sizeof (int),
495 .proc_handler = proc_dointvec,
500 .procname = "soft-power",
501 .data = &pwrsw_enabled,
502 .maxlen = sizeof (int),
504 .proc_handler = proc_dointvec,
507 .procname = "unaligned-trap",
508 .data = &unaligned_enabled,
509 .maxlen = sizeof (int),
511 .proc_handler = proc_dointvec,
515 .procname = "ctrl-alt-del",
517 .maxlen = sizeof(int),
519 .proc_handler = proc_dointvec,
521 #ifdef CONFIG_FUNCTION_TRACER
523 .procname = "ftrace_enabled",
524 .data = &ftrace_enabled,
525 .maxlen = sizeof(int),
527 .proc_handler = ftrace_enable_sysctl,
530 #ifdef CONFIG_STACK_TRACER
532 .procname = "stack_tracer_enabled",
533 .data = &stack_tracer_enabled,
534 .maxlen = sizeof(int),
536 .proc_handler = stack_trace_sysctl,
539 #ifdef CONFIG_TRACING
541 .procname = "ftrace_dump_on_oops",
542 .data = &ftrace_dump_on_oops,
543 .maxlen = sizeof(int),
545 .proc_handler = proc_dointvec,
548 #ifdef CONFIG_MODULES
550 .procname = "modprobe",
551 .data = &modprobe_path,
552 .maxlen = KMOD_PATH_LEN,
554 .proc_handler = proc_dostring,
557 .procname = "modules_disabled",
558 .data = &modules_disabled,
559 .maxlen = sizeof(int),
561 /* only handle a transition from default "0" to "1" */
562 .proc_handler = proc_dointvec_minmax,
567 #ifdef CONFIG_HOTPLUG
569 .procname = "hotplug",
570 .data = &uevent_helper,
571 .maxlen = UEVENT_HELPER_PATH_LEN,
573 .proc_handler = proc_dostring,
576 #ifdef CONFIG_CHR_DEV_SG
578 .procname = "sg-big-buff",
579 .data = &sg_big_buff,
580 .maxlen = sizeof (int),
582 .proc_handler = proc_dointvec,
585 #ifdef CONFIG_BSD_PROCESS_ACCT
589 .maxlen = 3*sizeof(int),
591 .proc_handler = proc_dointvec,
594 #ifdef CONFIG_MAGIC_SYSRQ
597 .data = &__sysrq_enabled,
598 .maxlen = sizeof (int),
600 .proc_handler = sysrq_sysctl_handler,
603 #ifdef CONFIG_PROC_SYSCTL
605 .procname = "cad_pid",
607 .maxlen = sizeof (int),
609 .proc_handler = proc_do_cad_pid,
613 .procname = "threads-max",
614 .data = &max_threads,
615 .maxlen = sizeof(int),
617 .proc_handler = proc_dointvec,
620 .procname = "random",
622 .child = random_table,
625 .procname = "usermodehelper",
627 .child = usermodehelper_table,
630 .procname = "overflowuid",
631 .data = &overflowuid,
632 .maxlen = sizeof(int),
634 .proc_handler = proc_dointvec_minmax,
635 .extra1 = &minolduid,
636 .extra2 = &maxolduid,
639 .procname = "overflowgid",
640 .data = &overflowgid,
641 .maxlen = sizeof(int),
643 .proc_handler = proc_dointvec_minmax,
644 .extra1 = &minolduid,
645 .extra2 = &maxolduid,
648 #ifdef CONFIG_MATHEMU
650 .procname = "ieee_emulation_warnings",
651 .data = &sysctl_ieee_emulation_warnings,
652 .maxlen = sizeof(int),
654 .proc_handler = proc_dointvec,
658 .procname = "userprocess_debug",
659 .data = &show_unhandled_signals,
660 .maxlen = sizeof(int),
662 .proc_handler = proc_dointvec,
666 .procname = "pid_max",
668 .maxlen = sizeof (int),
670 .proc_handler = proc_dointvec_minmax,
671 .extra1 = &pid_max_min,
672 .extra2 = &pid_max_max,
675 .procname = "panic_on_oops",
676 .data = &panic_on_oops,
677 .maxlen = sizeof(int),
679 .proc_handler = proc_dointvec,
681 #if defined CONFIG_PRINTK
683 .procname = "printk",
684 .data = &console_loglevel,
685 .maxlen = 4*sizeof(int),
687 .proc_handler = proc_dointvec,
690 .procname = "printk_ratelimit",
691 .data = &printk_ratelimit_state.interval,
692 .maxlen = sizeof(int),
694 .proc_handler = proc_dointvec_jiffies,
697 .procname = "printk_ratelimit_burst",
698 .data = &printk_ratelimit_state.burst,
699 .maxlen = sizeof(int),
701 .proc_handler = proc_dointvec,
704 .procname = "printk_delay",
705 .data = &printk_delay_msec,
706 .maxlen = sizeof(int),
708 .proc_handler = proc_dointvec_minmax,
710 .extra2 = &ten_thousand,
713 .procname = "dmesg_restrict",
714 .data = &dmesg_restrict,
715 .maxlen = sizeof(int),
717 .proc_handler = proc_dointvec_minmax_sysadmin,
722 .procname = "kptr_restrict",
723 .data = &kptr_restrict,
724 .maxlen = sizeof(int),
726 .proc_handler = proc_dointvec_minmax_sysadmin,
732 .procname = "ngroups_max",
733 .data = &ngroups_max,
734 .maxlen = sizeof (int),
736 .proc_handler = proc_dointvec,
739 .procname = "cap_last_cap",
740 .data = (void *)&cap_last_cap,
741 .maxlen = sizeof(int),
743 .proc_handler = proc_dointvec,
745 #if defined(CONFIG_LOCKUP_DETECTOR)
747 .procname = "watchdog",
748 .data = &watchdog_enabled,
749 .maxlen = sizeof (int),
751 .proc_handler = proc_dowatchdog,
756 .procname = "watchdog_thresh",
757 .data = &watchdog_thresh,
758 .maxlen = sizeof(int),
760 .proc_handler = proc_dowatchdog,
765 .procname = "softlockup_panic",
766 .data = &softlockup_panic,
767 .maxlen = sizeof(int),
769 .proc_handler = proc_dointvec_minmax,
774 .procname = "nmi_watchdog",
775 .data = &watchdog_enabled,
776 .maxlen = sizeof (int),
778 .proc_handler = proc_dowatchdog,
783 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
785 .procname = "unknown_nmi_panic",
786 .data = &unknown_nmi_panic,
787 .maxlen = sizeof (int),
789 .proc_handler = proc_dointvec,
792 #if defined(CONFIG_X86)
794 .procname = "panic_on_unrecovered_nmi",
795 .data = &panic_on_unrecovered_nmi,
796 .maxlen = sizeof(int),
798 .proc_handler = proc_dointvec,
801 .procname = "panic_on_io_nmi",
802 .data = &panic_on_io_nmi,
803 .maxlen = sizeof(int),
805 .proc_handler = proc_dointvec,
808 .procname = "bootloader_type",
809 .data = &bootloader_type,
810 .maxlen = sizeof (int),
812 .proc_handler = proc_dointvec,
815 .procname = "bootloader_version",
816 .data = &bootloader_version,
817 .maxlen = sizeof (int),
819 .proc_handler = proc_dointvec,
822 .procname = "kstack_depth_to_print",
823 .data = &kstack_depth_to_print,
824 .maxlen = sizeof(int),
826 .proc_handler = proc_dointvec,
829 .procname = "io_delay_type",
830 .data = &io_delay_type,
831 .maxlen = sizeof(int),
833 .proc_handler = proc_dointvec,
836 #if defined(CONFIG_MMU)
838 .procname = "randomize_va_space",
839 .data = &randomize_va_space,
840 .maxlen = sizeof(int),
842 .proc_handler = proc_dointvec,
845 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
847 .procname = "spin_retry",
849 .maxlen = sizeof (int),
851 .proc_handler = proc_dointvec,
854 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
856 .procname = "acpi_video_flags",
857 .data = &acpi_realmode_flags,
858 .maxlen = sizeof (unsigned long),
860 .proc_handler = proc_doulongvec_minmax,
865 .procname = "ignore-unaligned-usertrap",
866 .data = &no_unaligned_warning,
867 .maxlen = sizeof (int),
869 .proc_handler = proc_dointvec,
872 .procname = "unaligned-dump-stack",
873 .data = &unaligned_dump_stack,
874 .maxlen = sizeof (int),
876 .proc_handler = proc_dointvec,
879 #ifdef CONFIG_DETECT_HUNG_TASK
881 .procname = "hung_task_panic",
882 .data = &sysctl_hung_task_panic,
883 .maxlen = sizeof(int),
885 .proc_handler = proc_dointvec_minmax,
890 .procname = "hung_task_check_count",
891 .data = &sysctl_hung_task_check_count,
892 .maxlen = sizeof(unsigned long),
894 .proc_handler = proc_doulongvec_minmax,
897 .procname = "hung_task_timeout_secs",
898 .data = &sysctl_hung_task_timeout_secs,
899 .maxlen = sizeof(unsigned long),
901 .proc_handler = proc_dohung_task_timeout_secs,
904 .procname = "hung_task_warnings",
905 .data = &sysctl_hung_task_warnings,
906 .maxlen = sizeof(unsigned long),
908 .proc_handler = proc_doulongvec_minmax,
913 .procname = "compat-log",
915 .maxlen = sizeof (int),
917 .proc_handler = proc_dointvec,
920 #ifdef CONFIG_RT_MUTEXES
922 .procname = "max_lock_depth",
923 .data = &max_lock_depth,
924 .maxlen = sizeof(int),
926 .proc_handler = proc_dointvec,
930 .procname = "poweroff_cmd",
931 .data = &poweroff_cmd,
932 .maxlen = POWEROFF_CMD_PATH_LEN,
934 .proc_handler = proc_dostring,
940 .child = key_sysctls,
943 #ifdef CONFIG_RCU_TORTURE_TEST
945 .procname = "rcutorture_runnable",
946 .data = &rcutorture_runnable,
947 .maxlen = sizeof(int),
949 .proc_handler = proc_dointvec,
952 #ifdef CONFIG_PERF_EVENTS
954 * User-space scripts rely on the existence of this file
955 * as a feature check for perf_events being enabled.
957 * So it's an ABI, do not remove!
960 .procname = "perf_event_paranoid",
961 .data = &sysctl_perf_event_paranoid,
962 .maxlen = sizeof(sysctl_perf_event_paranoid),
964 .proc_handler = proc_dointvec,
967 .procname = "perf_event_mlock_kb",
968 .data = &sysctl_perf_event_mlock,
969 .maxlen = sizeof(sysctl_perf_event_mlock),
971 .proc_handler = proc_dointvec,
974 .procname = "perf_event_max_sample_rate",
975 .data = &sysctl_perf_event_sample_rate,
976 .maxlen = sizeof(sysctl_perf_event_sample_rate),
978 .proc_handler = perf_proc_update_handler,
981 #ifdef CONFIG_KMEMCHECK
983 .procname = "kmemcheck",
984 .data = &kmemcheck_enabled,
985 .maxlen = sizeof(int),
987 .proc_handler = proc_dointvec,
992 .procname = "blk_iopoll",
993 .data = &blk_iopoll_enabled,
994 .maxlen = sizeof(int),
996 .proc_handler = proc_dointvec,
1002 static struct ctl_table vm_table[] = {
1004 .procname = "overcommit_memory",
1005 .data = &sysctl_overcommit_memory,
1006 .maxlen = sizeof(sysctl_overcommit_memory),
1008 .proc_handler = proc_dointvec_minmax,
1013 .procname = "panic_on_oom",
1014 .data = &sysctl_panic_on_oom,
1015 .maxlen = sizeof(sysctl_panic_on_oom),
1017 .proc_handler = proc_dointvec_minmax,
1022 .procname = "oom_kill_allocating_task",
1023 .data = &sysctl_oom_kill_allocating_task,
1024 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1026 .proc_handler = proc_dointvec,
1029 .procname = "oom_dump_tasks",
1030 .data = &sysctl_oom_dump_tasks,
1031 .maxlen = sizeof(sysctl_oom_dump_tasks),
1033 .proc_handler = proc_dointvec,
1036 .procname = "overcommit_ratio",
1037 .data = &sysctl_overcommit_ratio,
1038 .maxlen = sizeof(sysctl_overcommit_ratio),
1040 .proc_handler = proc_dointvec,
1043 .procname = "page-cluster",
1044 .data = &page_cluster,
1045 .maxlen = sizeof(int),
1047 .proc_handler = proc_dointvec_minmax,
1051 .procname = "dirty_background_ratio",
1052 .data = &dirty_background_ratio,
1053 .maxlen = sizeof(dirty_background_ratio),
1055 .proc_handler = dirty_background_ratio_handler,
1057 .extra2 = &one_hundred,
1060 .procname = "dirty_background_bytes",
1061 .data = &dirty_background_bytes,
1062 .maxlen = sizeof(dirty_background_bytes),
1064 .proc_handler = dirty_background_bytes_handler,
1068 .procname = "dirty_ratio",
1069 .data = &vm_dirty_ratio,
1070 .maxlen = sizeof(vm_dirty_ratio),
1072 .proc_handler = dirty_ratio_handler,
1074 .extra2 = &one_hundred,
1077 .procname = "dirty_bytes",
1078 .data = &vm_dirty_bytes,
1079 .maxlen = sizeof(vm_dirty_bytes),
1081 .proc_handler = dirty_bytes_handler,
1082 .extra1 = &dirty_bytes_min,
1085 .procname = "dirty_writeback_centisecs",
1086 .data = &dirty_writeback_interval,
1087 .maxlen = sizeof(dirty_writeback_interval),
1089 .proc_handler = dirty_writeback_centisecs_handler,
1092 .procname = "dirty_expire_centisecs",
1093 .data = &dirty_expire_interval,
1094 .maxlen = sizeof(dirty_expire_interval),
1096 .proc_handler = proc_dointvec_minmax,
1100 .procname = "nr_pdflush_threads",
1101 .data = &nr_pdflush_threads,
1102 .maxlen = sizeof nr_pdflush_threads,
1103 .mode = 0444 /* read-only*/,
1104 .proc_handler = proc_dointvec,
1107 .procname = "swappiness",
1108 .data = &vm_swappiness,
1109 .maxlen = sizeof(vm_swappiness),
1111 .proc_handler = proc_dointvec_minmax,
1113 .extra2 = &one_hundred,
1115 #ifdef CONFIG_HUGETLB_PAGE
1117 .procname = "nr_hugepages",
1119 .maxlen = sizeof(unsigned long),
1121 .proc_handler = hugetlb_sysctl_handler,
1122 .extra1 = (void *)&hugetlb_zero,
1123 .extra2 = (void *)&hugetlb_infinity,
1127 .procname = "nr_hugepages_mempolicy",
1129 .maxlen = sizeof(unsigned long),
1131 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1132 .extra1 = (void *)&hugetlb_zero,
1133 .extra2 = (void *)&hugetlb_infinity,
1137 .procname = "hugetlb_shm_group",
1138 .data = &sysctl_hugetlb_shm_group,
1139 .maxlen = sizeof(gid_t),
1141 .proc_handler = proc_dointvec,
1144 .procname = "hugepages_treat_as_movable",
1145 .data = &hugepages_treat_as_movable,
1146 .maxlen = sizeof(int),
1148 .proc_handler = hugetlb_treat_movable_handler,
1151 .procname = "nr_overcommit_hugepages",
1153 .maxlen = sizeof(unsigned long),
1155 .proc_handler = hugetlb_overcommit_handler,
1156 .extra1 = (void *)&hugetlb_zero,
1157 .extra2 = (void *)&hugetlb_infinity,
1161 .procname = "lowmem_reserve_ratio",
1162 .data = &sysctl_lowmem_reserve_ratio,
1163 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1165 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1168 .procname = "drop_caches",
1169 .data = &sysctl_drop_caches,
1170 .maxlen = sizeof(int),
1172 .proc_handler = drop_caches_sysctl_handler,
1176 #ifdef CONFIG_COMPACTION
1178 .procname = "compact_memory",
1179 .data = &sysctl_compact_memory,
1180 .maxlen = sizeof(int),
1182 .proc_handler = sysctl_compaction_handler,
1185 .procname = "extfrag_threshold",
1186 .data = &sysctl_extfrag_threshold,
1187 .maxlen = sizeof(int),
1189 .proc_handler = sysctl_extfrag_handler,
1190 .extra1 = &min_extfrag_threshold,
1191 .extra2 = &max_extfrag_threshold,
1194 #endif /* CONFIG_COMPACTION */
1196 .procname = "min_free_kbytes",
1197 .data = &min_free_kbytes,
1198 .maxlen = sizeof(min_free_kbytes),
1200 .proc_handler = min_free_kbytes_sysctl_handler,
1204 .procname = "percpu_pagelist_fraction",
1205 .data = &percpu_pagelist_fraction,
1206 .maxlen = sizeof(percpu_pagelist_fraction),
1208 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1209 .extra1 = &min_percpu_pagelist_fract,
1213 .procname = "max_map_count",
1214 .data = &sysctl_max_map_count,
1215 .maxlen = sizeof(sysctl_max_map_count),
1217 .proc_handler = proc_dointvec_minmax,
1222 .procname = "nr_trim_pages",
1223 .data = &sysctl_nr_trim_pages,
1224 .maxlen = sizeof(sysctl_nr_trim_pages),
1226 .proc_handler = proc_dointvec_minmax,
1231 .procname = "laptop_mode",
1232 .data = &laptop_mode,
1233 .maxlen = sizeof(laptop_mode),
1235 .proc_handler = proc_dointvec_jiffies,
1238 .procname = "block_dump",
1239 .data = &block_dump,
1240 .maxlen = sizeof(block_dump),
1242 .proc_handler = proc_dointvec,
1246 .procname = "vfs_cache_pressure",
1247 .data = &sysctl_vfs_cache_pressure,
1248 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1250 .proc_handler = proc_dointvec,
1253 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1255 .procname = "legacy_va_layout",
1256 .data = &sysctl_legacy_va_layout,
1257 .maxlen = sizeof(sysctl_legacy_va_layout),
1259 .proc_handler = proc_dointvec,
1265 .procname = "zone_reclaim_mode",
1266 .data = &zone_reclaim_mode,
1267 .maxlen = sizeof(zone_reclaim_mode),
1269 .proc_handler = proc_dointvec,
1273 .procname = "min_unmapped_ratio",
1274 .data = &sysctl_min_unmapped_ratio,
1275 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1277 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1279 .extra2 = &one_hundred,
1282 .procname = "min_slab_ratio",
1283 .data = &sysctl_min_slab_ratio,
1284 .maxlen = sizeof(sysctl_min_slab_ratio),
1286 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1288 .extra2 = &one_hundred,
1293 .procname = "stat_interval",
1294 .data = &sysctl_stat_interval,
1295 .maxlen = sizeof(sysctl_stat_interval),
1297 .proc_handler = proc_dointvec_jiffies,
1302 .procname = "mmap_min_addr",
1303 .data = &dac_mmap_min_addr,
1304 .maxlen = sizeof(unsigned long),
1306 .proc_handler = mmap_min_addr_handler,
1311 .procname = "numa_zonelist_order",
1312 .data = &numa_zonelist_order,
1313 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1315 .proc_handler = numa_zonelist_order_handler,
1318 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1319 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1321 .procname = "vdso_enabled",
1322 .data = &vdso_enabled,
1323 .maxlen = sizeof(vdso_enabled),
1325 .proc_handler = proc_dointvec,
1329 #ifdef CONFIG_HIGHMEM
1331 .procname = "highmem_is_dirtyable",
1332 .data = &vm_highmem_is_dirtyable,
1333 .maxlen = sizeof(vm_highmem_is_dirtyable),
1335 .proc_handler = proc_dointvec_minmax,
1341 .procname = "scan_unevictable_pages",
1342 .data = &scan_unevictable_pages,
1343 .maxlen = sizeof(scan_unevictable_pages),
1345 .proc_handler = scan_unevictable_handler,
1347 #ifdef CONFIG_MEMORY_FAILURE
1349 .procname = "memory_failure_early_kill",
1350 .data = &sysctl_memory_failure_early_kill,
1351 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1353 .proc_handler = proc_dointvec_minmax,
1358 .procname = "memory_failure_recovery",
1359 .data = &sysctl_memory_failure_recovery,
1360 .maxlen = sizeof(sysctl_memory_failure_recovery),
1362 .proc_handler = proc_dointvec_minmax,
1370 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1371 static struct ctl_table binfmt_misc_table[] = {
1376 static struct ctl_table fs_table[] = {
1378 .procname = "inode-nr",
1379 .data = &inodes_stat,
1380 .maxlen = 2*sizeof(int),
1382 .proc_handler = proc_nr_inodes,
1385 .procname = "inode-state",
1386 .data = &inodes_stat,
1387 .maxlen = 7*sizeof(int),
1389 .proc_handler = proc_nr_inodes,
1392 .procname = "file-nr",
1393 .data = &files_stat,
1394 .maxlen = sizeof(files_stat),
1396 .proc_handler = proc_nr_files,
1399 .procname = "file-max",
1400 .data = &files_stat.max_files,
1401 .maxlen = sizeof(files_stat.max_files),
1403 .proc_handler = proc_doulongvec_minmax,
1406 .procname = "nr_open",
1407 .data = &sysctl_nr_open,
1408 .maxlen = sizeof(int),
1410 .proc_handler = proc_dointvec_minmax,
1411 .extra1 = &sysctl_nr_open_min,
1412 .extra2 = &sysctl_nr_open_max,
1415 .procname = "dentry-state",
1416 .data = &dentry_stat,
1417 .maxlen = 6*sizeof(int),
1419 .proc_handler = proc_nr_dentry,
1422 .procname = "overflowuid",
1423 .data = &fs_overflowuid,
1424 .maxlen = sizeof(int),
1426 .proc_handler = proc_dointvec_minmax,
1427 .extra1 = &minolduid,
1428 .extra2 = &maxolduid,
1431 .procname = "overflowgid",
1432 .data = &fs_overflowgid,
1433 .maxlen = sizeof(int),
1435 .proc_handler = proc_dointvec_minmax,
1436 .extra1 = &minolduid,
1437 .extra2 = &maxolduid,
1439 #ifdef CONFIG_FILE_LOCKING
1441 .procname = "leases-enable",
1442 .data = &leases_enable,
1443 .maxlen = sizeof(int),
1445 .proc_handler = proc_dointvec,
1448 #ifdef CONFIG_DNOTIFY
1450 .procname = "dir-notify-enable",
1451 .data = &dir_notify_enable,
1452 .maxlen = sizeof(int),
1454 .proc_handler = proc_dointvec,
1458 #ifdef CONFIG_FILE_LOCKING
1460 .procname = "lease-break-time",
1461 .data = &lease_break_time,
1462 .maxlen = sizeof(int),
1464 .proc_handler = proc_dointvec,
1469 .procname = "aio-nr",
1471 .maxlen = sizeof(aio_nr),
1473 .proc_handler = proc_doulongvec_minmax,
1476 .procname = "aio-max-nr",
1477 .data = &aio_max_nr,
1478 .maxlen = sizeof(aio_max_nr),
1480 .proc_handler = proc_doulongvec_minmax,
1482 #endif /* CONFIG_AIO */
1483 #ifdef CONFIG_INOTIFY_USER
1485 .procname = "inotify",
1487 .child = inotify_table,
1492 .procname = "epoll",
1494 .child = epoll_table,
1499 .procname = "suid_dumpable",
1500 .data = &suid_dumpable,
1501 .maxlen = sizeof(int),
1503 .proc_handler = proc_dointvec_minmax,
1507 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1509 .procname = "binfmt_misc",
1511 .child = binfmt_misc_table,
1515 .procname = "pipe-max-size",
1516 .data = &pipe_max_size,
1517 .maxlen = sizeof(int),
1519 .proc_handler = &pipe_proc_fn,
1520 .extra1 = &pipe_min_size,
1523 .procname = "pipe-user-pages-hard",
1524 .data = &pipe_user_pages_hard,
1525 .maxlen = sizeof(pipe_user_pages_hard),
1527 .proc_handler = proc_doulongvec_minmax,
1530 .procname = "pipe-user-pages-soft",
1531 .data = &pipe_user_pages_soft,
1532 .maxlen = sizeof(pipe_user_pages_soft),
1534 .proc_handler = proc_doulongvec_minmax,
1539 static struct ctl_table debug_table[] = {
1540 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1541 defined(CONFIG_S390) || defined(CONFIG_TILE)
1543 .procname = "exception-trace",
1544 .data = &show_unhandled_signals,
1545 .maxlen = sizeof(int),
1547 .proc_handler = proc_dointvec
1550 #if defined(CONFIG_OPTPROBES)
1552 .procname = "kprobes-optimization",
1553 .data = &sysctl_kprobes_optimization,
1554 .maxlen = sizeof(int),
1556 .proc_handler = proc_kprobes_optimization_handler,
1564 static struct ctl_table dev_table[] = {
1568 static DEFINE_SPINLOCK(sysctl_lock);
1570 /* called under sysctl_lock */
1571 static int use_table(struct ctl_table_header *p)
1573 if (unlikely(p->unregistering))
1579 /* called under sysctl_lock */
1580 static void unuse_table(struct ctl_table_header *p)
1583 if (unlikely(p->unregistering))
1584 complete(p->unregistering);
1587 /* called under sysctl_lock, will reacquire if has to wait */
1588 static void start_unregistering(struct ctl_table_header *p)
1591 * if p->used is 0, nobody will ever touch that entry again;
1592 * we'll eliminate all paths to it before dropping sysctl_lock
1594 if (unlikely(p->used)) {
1595 struct completion wait;
1596 init_completion(&wait);
1597 p->unregistering = &wait;
1598 spin_unlock(&sysctl_lock);
1599 wait_for_completion(&wait);
1600 spin_lock(&sysctl_lock);
1602 /* anything non-NULL; we'll never dereference it */
1603 p->unregistering = ERR_PTR(-EINVAL);
1606 * do not remove from the list until nobody holds it; walking the
1607 * list in do_sysctl() relies on that.
1609 list_del_init(&p->ctl_entry);
1612 void sysctl_head_get(struct ctl_table_header *head)
1614 spin_lock(&sysctl_lock);
1616 spin_unlock(&sysctl_lock);
1619 void sysctl_head_put(struct ctl_table_header *head)
1621 spin_lock(&sysctl_lock);
1623 kfree_rcu(head, rcu);
1624 spin_unlock(&sysctl_lock);
1627 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1631 spin_lock(&sysctl_lock);
1632 if (!use_table(head))
1633 head = ERR_PTR(-ENOENT);
1634 spin_unlock(&sysctl_lock);
1638 void sysctl_head_finish(struct ctl_table_header *head)
1642 spin_lock(&sysctl_lock);
1644 spin_unlock(&sysctl_lock);
1647 static struct ctl_table_set *
1648 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1650 struct ctl_table_set *set = &root->default_set;
1652 set = root->lookup(root, namespaces);
1656 static struct list_head *
1657 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1659 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1663 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1664 struct ctl_table_header *prev)
1666 struct ctl_table_root *root;
1667 struct list_head *header_list;
1668 struct ctl_table_header *head;
1669 struct list_head *tmp;
1671 spin_lock(&sysctl_lock);
1674 tmp = &prev->ctl_entry;
1678 tmp = &root_table_header.ctl_entry;
1680 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1682 if (!use_table(head))
1684 spin_unlock(&sysctl_lock);
1689 header_list = lookup_header_list(root, namespaces);
1690 if (tmp != header_list)
1694 root = list_entry(root->root_list.next,
1695 struct ctl_table_root, root_list);
1696 if (root == &sysctl_table_root)
1698 header_list = lookup_header_list(root, namespaces);
1699 } while (list_empty(header_list));
1700 tmp = header_list->next;
1703 spin_unlock(&sysctl_lock);
1707 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1709 return __sysctl_head_next(current->nsproxy, prev);
1712 void register_sysctl_root(struct ctl_table_root *root)
1714 spin_lock(&sysctl_lock);
1715 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1716 spin_unlock(&sysctl_lock);
1720 * sysctl_perm does NOT grant the superuser all rights automatically, because
1721 * some sysctl variables are readonly even to root.
1724 static int test_perm(int mode, int op)
1726 if (!current_euid())
1728 else if (in_egroup_p(0))
1730 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1735 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1739 if (root->permissions)
1740 mode = root->permissions(root, current->nsproxy, table);
1744 return test_perm(mode, op);
1747 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1749 for (; table->procname; table++) {
1750 table->parent = parent;
1752 sysctl_set_parent(table, table->child);
1756 static __init int sysctl_init(void)
1758 sysctl_set_parent(NULL, root_table);
1759 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1760 sysctl_check_table(current->nsproxy, root_table);
1765 core_initcall(sysctl_init);
1767 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1768 struct ctl_table *table)
1770 struct ctl_table *p;
1771 const char *s = branch->procname;
1773 /* branch should have named subdirectory as its first element */
1774 if (!s || !branch->child)
1777 /* ... and nothing else */
1778 if (branch[1].procname)
1781 /* table should contain subdirectory with the same name */
1782 for (p = table; p->procname; p++) {
1785 if (p->procname && strcmp(p->procname, s) == 0)
1791 /* see if attaching q to p would be an improvement */
1792 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1794 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1795 struct ctl_table *next;
1797 int not_in_parent = !p->attached_by;
1799 while ((next = is_branch_in(by, to)) != NULL) {
1800 if (by == q->attached_by)
1802 if (to == p->attached_by)
1808 if (is_better && not_in_parent) {
1809 q->attached_by = by;
1810 q->attached_to = to;
1816 * __register_sysctl_paths - register a sysctl hierarchy
1817 * @root: List of sysctl headers to register on
1818 * @namespaces: Data to compute which lists of sysctl entries are visible
1819 * @path: The path to the directory the sysctl table is in.
1820 * @table: the top-level table structure
1822 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1823 * array. A completely 0 filled entry terminates the table.
1825 * The members of the &struct ctl_table structure are used as follows:
1827 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1828 * enter a sysctl file
1830 * data - a pointer to data for use by proc_handler
1832 * maxlen - the maximum size in bytes of the data
1834 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1836 * child - a pointer to the child sysctl table if this entry is a directory, or
1839 * proc_handler - the text handler routine (described below)
1841 * de - for internal use by the sysctl routines
1843 * extra1, extra2 - extra pointers usable by the proc handler routines
1845 * Leaf nodes in the sysctl tree will be represented by a single file
1846 * under /proc; non-leaf nodes will be represented by directories.
1848 * sysctl(2) can automatically manage read and write requests through
1849 * the sysctl table. The data and maxlen fields of the ctl_table
1850 * struct enable minimal validation of the values being written to be
1851 * performed, and the mode field allows minimal authentication.
1853 * There must be a proc_handler routine for any terminal nodes
1854 * mirrored under /proc/sys (non-terminals are handled by a built-in
1855 * directory handler). Several default handlers are available to
1856 * cover common cases -
1858 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1859 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1860 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1862 * It is the handler's job to read the input buffer from user memory
1863 * and process it. The handler should return 0 on success.
1865 * This routine returns %NULL on a failure to register, and a pointer
1866 * to the table header on success.
1868 struct ctl_table_header *__register_sysctl_paths(
1869 struct ctl_table_root *root,
1870 struct nsproxy *namespaces,
1871 const struct ctl_path *path, struct ctl_table *table)
1873 struct ctl_table_header *header;
1874 struct ctl_table *new, **prevp;
1875 unsigned int n, npath;
1876 struct ctl_table_set *set;
1878 /* Count the path components */
1879 for (npath = 0; path[npath].procname; ++npath)
1883 * For each path component, allocate a 2-element ctl_table array.
1884 * The first array element will be filled with the sysctl entry
1885 * for this, the second will be the sentinel (procname == 0).
1887 * We allocate everything in one go so that we don't have to
1888 * worry about freeing additional memory in unregister_sysctl_table.
1890 header = kzalloc(sizeof(struct ctl_table_header) +
1891 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1895 new = (struct ctl_table *) (header + 1);
1897 /* Now connect the dots */
1898 prevp = &header->ctl_table;
1899 for (n = 0; n < npath; ++n, ++path) {
1900 /* Copy the procname */
1901 new->procname = path->procname;
1905 prevp = &new->child;
1910 header->ctl_table_arg = table;
1912 INIT_LIST_HEAD(&header->ctl_entry);
1914 header->unregistering = NULL;
1915 header->root = root;
1916 sysctl_set_parent(NULL, header->ctl_table);
1918 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1919 if (sysctl_check_table(namespaces, header->ctl_table)) {
1924 spin_lock(&sysctl_lock);
1925 header->set = lookup_header_set(root, namespaces);
1926 header->attached_by = header->ctl_table;
1927 header->attached_to = root_table;
1928 header->parent = &root_table_header;
1929 for (set = header->set; set; set = set->parent) {
1930 struct ctl_table_header *p;
1931 list_for_each_entry(p, &set->list, ctl_entry) {
1932 if (p->unregistering)
1934 try_attach(p, header);
1937 header->parent->count++;
1938 list_add_tail(&header->ctl_entry, &header->set->list);
1939 spin_unlock(&sysctl_lock);
1945 * register_sysctl_table_path - register a sysctl table hierarchy
1946 * @path: The path to the directory the sysctl table is in.
1947 * @table: the top-level table structure
1949 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1950 * array. A completely 0 filled entry terminates the table.
1952 * See __register_sysctl_paths for more details.
1954 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1955 struct ctl_table *table)
1957 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1962 * register_sysctl_table - register a sysctl table hierarchy
1963 * @table: the top-level table structure
1965 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1966 * array. A completely 0 filled entry terminates the table.
1968 * See register_sysctl_paths for more details.
1970 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1972 static const struct ctl_path null_path[] = { {} };
1974 return register_sysctl_paths(null_path, table);
1978 * unregister_sysctl_table - unregister a sysctl table hierarchy
1979 * @header: the header returned from register_sysctl_table
1981 * Unregisters the sysctl table and all children. proc entries may not
1982 * actually be removed until they are no longer used by anyone.
1984 void unregister_sysctl_table(struct ctl_table_header * header)
1991 spin_lock(&sysctl_lock);
1992 start_unregistering(header);
1993 if (!--header->parent->count) {
1995 kfree_rcu(header->parent, rcu);
1997 if (!--header->count)
1998 kfree_rcu(header, rcu);
1999 spin_unlock(&sysctl_lock);
2002 int sysctl_is_seen(struct ctl_table_header *p)
2004 struct ctl_table_set *set = p->set;
2006 spin_lock(&sysctl_lock);
2007 if (p->unregistering)
2009 else if (!set->is_seen)
2012 res = set->is_seen(set);
2013 spin_unlock(&sysctl_lock);
2017 void setup_sysctl_set(struct ctl_table_set *p,
2018 struct ctl_table_set *parent,
2019 int (*is_seen)(struct ctl_table_set *))
2021 INIT_LIST_HEAD(&p->list);
2022 p->parent = parent ? parent : &sysctl_table_root.default_set;
2023 p->is_seen = is_seen;
2026 #else /* !CONFIG_SYSCTL */
2027 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2032 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2033 struct ctl_table *table)
2038 void unregister_sysctl_table(struct ctl_table_header * table)
2042 void setup_sysctl_set(struct ctl_table_set *p,
2043 struct ctl_table_set *parent,
2044 int (*is_seen)(struct ctl_table_set *))
2048 void sysctl_head_put(struct ctl_table_header *head)
2052 #endif /* CONFIG_SYSCTL */
2058 #ifdef CONFIG_PROC_SYSCTL
2060 static int _proc_do_string(void* data, int maxlen, int write,
2061 void __user *buffer,
2062 size_t *lenp, loff_t *ppos)
2068 if (!data || !maxlen || !*lenp) {
2076 while (len < *lenp) {
2077 if (get_user(c, p++))
2079 if (c == 0 || c == '\n')
2085 if(copy_from_user(data, buffer, len))
2087 ((char *) data)[len] = 0;
2105 if(copy_to_user(buffer, data, len))
2108 if(put_user('\n', ((char __user *) buffer) + len))
2119 * proc_dostring - read a string sysctl
2120 * @table: the sysctl table
2121 * @write: %TRUE if this is a write to the sysctl file
2122 * @buffer: the user buffer
2123 * @lenp: the size of the user buffer
2124 * @ppos: file position
2126 * Reads/writes a string from/to the user buffer. If the kernel
2127 * buffer provided is not large enough to hold the string, the
2128 * string is truncated. The copied string is %NULL-terminated.
2129 * If the string is being read by the user process, it is copied
2130 * and a newline '\n' is added. It is truncated if the buffer is
2133 * Returns 0 on success.
2135 int proc_dostring(struct ctl_table *table, int write,
2136 void __user *buffer, size_t *lenp, loff_t *ppos)
2138 return _proc_do_string(table->data, table->maxlen, write,
2139 buffer, lenp, ppos);
2142 static size_t proc_skip_spaces(char **buf)
2145 char *tmp = skip_spaces(*buf);
2151 static void proc_skip_char(char **buf, size_t *size, const char v)
2161 #define TMPBUFLEN 22
2163 * proc_get_long - reads an ASCII formatted integer from a user buffer
2165 * @buf: a kernel buffer
2166 * @size: size of the kernel buffer
2167 * @val: this is where the number will be stored
2168 * @neg: set to %TRUE if number is negative
2169 * @perm_tr: a vector which contains the allowed trailers
2170 * @perm_tr_len: size of the perm_tr vector
2171 * @tr: pointer to store the trailer character
2173 * In case of success %0 is returned and @buf and @size are updated with
2174 * the amount of bytes read. If @tr is non-NULL and a trailing
2175 * character exists (size is non-zero after returning from this
2176 * function), @tr is updated with the trailing character.
2178 static int proc_get_long(char **buf, size_t *size,
2179 unsigned long *val, bool *neg,
2180 const char *perm_tr, unsigned perm_tr_len, char *tr)
2183 char *p, tmp[TMPBUFLEN];
2189 if (len > TMPBUFLEN - 1)
2190 len = TMPBUFLEN - 1;
2192 memcpy(tmp, *buf, len);
2196 if (*p == '-' && *size > 1) {
2204 *val = simple_strtoul(p, &p, 0);
2208 /* We don't know if the next char is whitespace thus we may accept
2209 * invalid integers (e.g. 1234...a) or two integers instead of one
2210 * (e.g. 123...1). So lets not allow such large numbers. */
2211 if (len == TMPBUFLEN - 1)
2214 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2217 if (tr && (len < *size))
2227 * proc_put_long - converts an integer to a decimal ASCII formatted string
2229 * @buf: the user buffer
2230 * @size: the size of the user buffer
2231 * @val: the integer to be converted
2232 * @neg: sign of the number, %TRUE for negative
2234 * In case of success %0 is returned and @buf and @size are updated with
2235 * the amount of bytes written.
2237 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2241 char tmp[TMPBUFLEN], *p = tmp;
2243 sprintf(p, "%s%lu", neg ? "-" : "", val);
2247 if (copy_to_user(*buf, tmp, len))
2255 static int proc_put_char(void __user **buf, size_t *size, char c)
2258 char __user **buffer = (char __user **)buf;
2259 if (put_user(c, *buffer))
2261 (*size)--, (*buffer)++;
2267 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2269 int write, void *data)
2272 *valp = *negp ? -*lvalp : *lvalp;
2277 *lvalp = (unsigned long)-val;
2280 *lvalp = (unsigned long)val;
2286 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2288 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2289 int write, void __user *buffer,
2290 size_t *lenp, loff_t *ppos,
2291 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2292 int write, void *data),
2295 int *i, vleft, first = 1, err = 0;
2296 unsigned long page = 0;
2300 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2305 i = (int *) tbl_data;
2306 vleft = table->maxlen / sizeof(*i);
2310 conv = do_proc_dointvec_conv;
2313 if (left > PAGE_SIZE - 1)
2314 left = PAGE_SIZE - 1;
2315 page = __get_free_page(GFP_TEMPORARY);
2316 kbuf = (char *) page;
2319 if (copy_from_user(kbuf, buffer, left)) {
2326 for (; left && vleft--; i++, first=0) {
2331 left -= proc_skip_spaces(&kbuf);
2335 err = proc_get_long(&kbuf, &left, &lval, &neg,
2337 sizeof(proc_wspace_sep), NULL);
2340 if (conv(&neg, &lval, i, 1, data)) {
2345 if (conv(&neg, &lval, i, 0, data)) {
2350 err = proc_put_char(&buffer, &left, '\t');
2353 err = proc_put_long(&buffer, &left, lval, neg);
2359 if (!write && !first && left && !err)
2360 err = proc_put_char(&buffer, &left, '\n');
2361 if (write && !err && left)
2362 left -= proc_skip_spaces(&kbuf);
2367 return err ? : -EINVAL;
2374 static int do_proc_dointvec(struct ctl_table *table, int write,
2375 void __user *buffer, size_t *lenp, loff_t *ppos,
2376 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2377 int write, void *data),
2380 return __do_proc_dointvec(table->data, table, write,
2381 buffer, lenp, ppos, conv, data);
2385 * proc_dointvec - read a vector of integers
2386 * @table: the sysctl table
2387 * @write: %TRUE if this is a write to the sysctl file
2388 * @buffer: the user buffer
2389 * @lenp: the size of the user buffer
2390 * @ppos: file position
2392 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2393 * values from/to the user buffer, treated as an ASCII string.
2395 * Returns 0 on success.
2397 int proc_dointvec(struct ctl_table *table, int write,
2398 void __user *buffer, size_t *lenp, loff_t *ppos)
2400 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2405 * Taint values can only be increased
2406 * This means we can safely use a temporary.
2408 static int proc_taint(struct ctl_table *table, int write,
2409 void __user *buffer, size_t *lenp, loff_t *ppos)
2412 unsigned long tmptaint = get_taint();
2415 if (write && !capable(CAP_SYS_ADMIN))
2420 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2426 * Poor man's atomic or. Not worth adding a primitive
2427 * to everyone's atomic.h for this
2430 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2431 if ((tmptaint >> i) & 1)
2439 #ifdef CONFIG_PRINTK
2440 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2441 void __user *buffer, size_t *lenp, loff_t *ppos)
2443 if (write && !capable(CAP_SYS_ADMIN))
2446 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2450 struct do_proc_dointvec_minmax_conv_param {
2455 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2457 int write, void *data)
2459 struct do_proc_dointvec_minmax_conv_param *param = data;
2461 int val = *negp ? -*lvalp : *lvalp;
2462 if ((param->min && *param->min > val) ||
2463 (param->max && *param->max < val))
2470 *lvalp = (unsigned long)-val;
2473 *lvalp = (unsigned long)val;
2480 * proc_dointvec_minmax - read a vector of integers with min/max values
2481 * @table: the sysctl table
2482 * @write: %TRUE if this is a write to the sysctl file
2483 * @buffer: the user buffer
2484 * @lenp: the size of the user buffer
2485 * @ppos: file position
2487 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2488 * values from/to the user buffer, treated as an ASCII string.
2490 * This routine will ensure the values are within the range specified by
2491 * table->extra1 (min) and table->extra2 (max).
2493 * Returns 0 on success.
2495 int proc_dointvec_minmax(struct ctl_table *table, int write,
2496 void __user *buffer, size_t *lenp, loff_t *ppos)
2498 struct do_proc_dointvec_minmax_conv_param param = {
2499 .min = (int *) table->extra1,
2500 .max = (int *) table->extra2,
2502 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2503 do_proc_dointvec_minmax_conv, ¶m);
2506 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2507 void __user *buffer,
2508 size_t *lenp, loff_t *ppos,
2509 unsigned long convmul,
2510 unsigned long convdiv)
2512 unsigned long *i, *min, *max;
2513 int vleft, first = 1, err = 0;
2514 unsigned long page = 0;
2518 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2523 i = (unsigned long *) data;
2524 min = (unsigned long *) table->extra1;
2525 max = (unsigned long *) table->extra2;
2526 vleft = table->maxlen / sizeof(unsigned long);
2530 if (left > PAGE_SIZE - 1)
2531 left = PAGE_SIZE - 1;
2532 page = __get_free_page(GFP_TEMPORARY);
2533 kbuf = (char *) page;
2536 if (copy_from_user(kbuf, buffer, left)) {
2543 for (; left && vleft--; i++, first = 0) {
2549 left -= proc_skip_spaces(&kbuf);
2551 err = proc_get_long(&kbuf, &left, &val, &neg,
2553 sizeof(proc_wspace_sep), NULL);
2558 val = convmul * val / convdiv;
2559 if ((min && val < *min) || (max && val > *max))
2563 val = convdiv * (*i) / convmul;
2565 err = proc_put_char(&buffer, &left, '\t');
2566 err = proc_put_long(&buffer, &left, val, false);
2572 if (!write && !first && left && !err)
2573 err = proc_put_char(&buffer, &left, '\n');
2575 left -= proc_skip_spaces(&kbuf);
2580 return err ? : -EINVAL;
2587 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2588 void __user *buffer,
2589 size_t *lenp, loff_t *ppos,
2590 unsigned long convmul,
2591 unsigned long convdiv)
2593 return __do_proc_doulongvec_minmax(table->data, table, write,
2594 buffer, lenp, ppos, convmul, convdiv);
2598 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2599 * @table: the sysctl table
2600 * @write: %TRUE if this is a write to the sysctl file
2601 * @buffer: the user buffer
2602 * @lenp: the size of the user buffer
2603 * @ppos: file position
2605 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2606 * values from/to the user buffer, treated as an ASCII string.
2608 * This routine will ensure the values are within the range specified by
2609 * table->extra1 (min) and table->extra2 (max).
2611 * Returns 0 on success.
2613 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2614 void __user *buffer, size_t *lenp, loff_t *ppos)
2616 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2620 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2621 * @table: the sysctl table
2622 * @write: %TRUE if this is a write to the sysctl file
2623 * @buffer: the user buffer
2624 * @lenp: the size of the user buffer
2625 * @ppos: file position
2627 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2628 * values from/to the user buffer, treated as an ASCII string. The values
2629 * are treated as milliseconds, and converted to jiffies when they are stored.
2631 * This routine will ensure the values are within the range specified by
2632 * table->extra1 (min) and table->extra2 (max).
2634 * Returns 0 on success.
2636 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2637 void __user *buffer,
2638 size_t *lenp, loff_t *ppos)
2640 return do_proc_doulongvec_minmax(table, write, buffer,
2641 lenp, ppos, HZ, 1000l);
2645 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2647 int write, void *data)
2650 if (*lvalp > LONG_MAX / HZ)
2652 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2658 lval = (unsigned long)-val;
2661 lval = (unsigned long)val;
2668 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2670 int write, void *data)
2673 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2675 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2681 lval = (unsigned long)-val;
2684 lval = (unsigned long)val;
2686 *lvalp = jiffies_to_clock_t(lval);
2691 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2693 int write, void *data)
2696 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2702 lval = (unsigned long)-val;
2705 lval = (unsigned long)val;
2707 *lvalp = jiffies_to_msecs(lval);
2713 * proc_dointvec_jiffies - read a vector of integers as seconds
2714 * @table: the sysctl table
2715 * @write: %TRUE if this is a write to the sysctl file
2716 * @buffer: the user buffer
2717 * @lenp: the size of the user buffer
2718 * @ppos: file position
2720 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2721 * values from/to the user buffer, treated as an ASCII string.
2722 * The values read are assumed to be in seconds, and are converted into
2725 * Returns 0 on success.
2727 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2728 void __user *buffer, size_t *lenp, loff_t *ppos)
2730 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2731 do_proc_dointvec_jiffies_conv,NULL);
2735 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2736 * @table: the sysctl table
2737 * @write: %TRUE if this is a write to the sysctl file
2738 * @buffer: the user buffer
2739 * @lenp: the size of the user buffer
2740 * @ppos: pointer to the file position
2742 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2743 * values from/to the user buffer, treated as an ASCII string.
2744 * The values read are assumed to be in 1/USER_HZ seconds, and
2745 * are converted into jiffies.
2747 * Returns 0 on success.
2749 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2750 void __user *buffer, size_t *lenp, loff_t *ppos)
2752 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2753 do_proc_dointvec_userhz_jiffies_conv,NULL);
2757 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2758 * @table: the sysctl table
2759 * @write: %TRUE if this is a write to the sysctl file
2760 * @buffer: the user buffer
2761 * @lenp: the size of the user buffer
2762 * @ppos: file position
2763 * @ppos: the current position in the file
2765 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2766 * values from/to the user buffer, treated as an ASCII string.
2767 * The values read are assumed to be in 1/1000 seconds, and
2768 * are converted into jiffies.
2770 * Returns 0 on success.
2772 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2773 void __user *buffer, size_t *lenp, loff_t *ppos)
2775 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2776 do_proc_dointvec_ms_jiffies_conv, NULL);
2779 static int proc_do_cad_pid(struct ctl_table *table, int write,
2780 void __user *buffer, size_t *lenp, loff_t *ppos)
2782 struct pid *new_pid;
2786 tmp = pid_vnr(cad_pid);
2788 r = __do_proc_dointvec(&tmp, table, write, buffer,
2789 lenp, ppos, NULL, NULL);
2793 new_pid = find_get_pid(tmp);
2797 put_pid(xchg(&cad_pid, new_pid));
2802 * proc_do_large_bitmap - read/write from/to a large bitmap
2803 * @table: the sysctl table
2804 * @write: %TRUE if this is a write to the sysctl file
2805 * @buffer: the user buffer
2806 * @lenp: the size of the user buffer
2807 * @ppos: file position
2809 * The bitmap is stored at table->data and the bitmap length (in bits)
2812 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2813 * large bitmaps may be represented in a compact manner. Writing into
2814 * the file will clear the bitmap then update it with the given input.
2816 * Returns 0 on success.
2818 int proc_do_large_bitmap(struct ctl_table *table, int write,
2819 void __user *buffer, size_t *lenp, loff_t *ppos)
2823 size_t left = *lenp;
2824 unsigned long bitmap_len = table->maxlen;
2825 unsigned long *bitmap = (unsigned long *) table->data;
2826 unsigned long *tmp_bitmap = NULL;
2827 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2829 if (!bitmap_len || !left || (*ppos && !write)) {
2835 unsigned long page = 0;
2838 if (left > PAGE_SIZE - 1)
2839 left = PAGE_SIZE - 1;
2841 page = __get_free_page(GFP_TEMPORARY);
2842 kbuf = (char *) page;
2845 if (copy_from_user(kbuf, buffer, left)) {
2851 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2857 proc_skip_char(&kbuf, &left, '\n');
2858 while (!err && left) {
2859 unsigned long val_a, val_b;
2862 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2866 if (val_a >= bitmap_len || neg) {
2878 err = proc_get_long(&kbuf, &left, &val_b,
2879 &neg, tr_b, sizeof(tr_b),
2883 if (val_b >= bitmap_len || neg ||
2894 while (val_a <= val_b)
2895 set_bit(val_a++, tmp_bitmap);
2898 proc_skip_char(&kbuf, &left, '\n');
2902 unsigned long bit_a, bit_b = 0;
2905 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2906 if (bit_a >= bitmap_len)
2908 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2912 err = proc_put_char(&buffer, &left, ',');
2916 err = proc_put_long(&buffer, &left, bit_a, false);
2919 if (bit_a != bit_b) {
2920 err = proc_put_char(&buffer, &left, '-');
2923 err = proc_put_long(&buffer, &left, bit_b, false);
2931 err = proc_put_char(&buffer, &left, '\n');
2937 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2939 memcpy(bitmap, tmp_bitmap,
2940 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2952 #else /* CONFIG_PROC_SYSCTL */
2954 int proc_dostring(struct ctl_table *table, int write,
2955 void __user *buffer, size_t *lenp, loff_t *ppos)
2960 int proc_dointvec(struct ctl_table *table, int write,
2961 void __user *buffer, size_t *lenp, loff_t *ppos)
2966 int proc_dointvec_minmax(struct ctl_table *table, int write,
2967 void __user *buffer, size_t *lenp, loff_t *ppos)
2972 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2973 void __user *buffer, size_t *lenp, loff_t *ppos)
2978 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2979 void __user *buffer, size_t *lenp, loff_t *ppos)
2984 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2985 void __user *buffer, size_t *lenp, loff_t *ppos)
2990 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2991 void __user *buffer, size_t *lenp, loff_t *ppos)
2996 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2997 void __user *buffer,
2998 size_t *lenp, loff_t *ppos)
3004 #endif /* CONFIG_PROC_SYSCTL */
3007 * No sense putting this after each symbol definition, twice,
3008 * exception granted :-)
3010 EXPORT_SYMBOL(proc_dointvec);
3011 EXPORT_SYMBOL(proc_dointvec_jiffies);
3012 EXPORT_SYMBOL(proc_dointvec_minmax);
3013 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3014 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3015 EXPORT_SYMBOL(proc_dostring);
3016 EXPORT_SYMBOL(proc_doulongvec_minmax);
3017 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3018 EXPORT_SYMBOL(register_sysctl_table);
3019 EXPORT_SYMBOL(register_sysctl_paths);
3020 EXPORT_SYMBOL(unregister_sysctl_table);