mm: fix dirty_bytes/dirty_background_bytes sysctls on 64bit arches
[linux-2.6.git] / kernel / sysctl.c
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/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/smp_lock.h>
31 #include <linux/fs.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/hugetlb.h>
40 #include <linux/initrd.h>
41 #include <linux/key.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/vmstat.h>
47 #include <linux/nfs_fs.h>
48 #include <linux/acpi.h>
49 #include <linux/reboot.h>
50 #include <linux/ftrace.h>
51
52 #include <asm/uaccess.h>
53 #include <asm/processor.h>
54
55 #ifdef CONFIG_X86
56 #include <asm/nmi.h>
57 #include <asm/stacktrace.h>
58 #include <asm/io.h>
59 #endif
60
61 static int deprecated_sysctl_warning(struct __sysctl_args *args);
62
63 #if defined(CONFIG_SYSCTL)
64
65 /* External variables not in a header file. */
66 extern int C_A_D;
67 extern int print_fatal_signals;
68 extern int sysctl_overcommit_memory;
69 extern int sysctl_overcommit_ratio;
70 extern int sysctl_panic_on_oom;
71 extern int sysctl_oom_kill_allocating_task;
72 extern int sysctl_oom_dump_tasks;
73 extern int max_threads;
74 extern int core_uses_pid;
75 extern int suid_dumpable;
76 extern char core_pattern[];
77 extern int pid_max;
78 extern int min_free_kbytes;
79 extern int pid_max_min, pid_max_max;
80 extern int sysctl_drop_caches;
81 extern int percpu_pagelist_fraction;
82 extern int compat_log;
83 extern int latencytop_enabled;
84 extern int sysctl_nr_open_min, sysctl_nr_open_max;
85 #ifndef CONFIG_MMU
86 extern int sysctl_nr_trim_pages;
87 #endif
88 #ifdef CONFIG_RCU_TORTURE_TEST
89 extern int rcutorture_runnable;
90 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
91
92 /* Constants used for minimum and  maximum */
93 #ifdef CONFIG_DETECT_SOFTLOCKUP
94 static int sixty = 60;
95 static int neg_one = -1;
96 #endif
97
98 #if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
99 static int two = 2;
100 #endif
101
102 static int zero;
103 static int one = 1;
104 static unsigned long one_ul = 1;
105 static int one_hundred = 100;
106
107 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
108 static int maxolduid = 65535;
109 static int minolduid;
110 static int min_percpu_pagelist_fract = 8;
111
112 static int ngroups_max = NGROUPS_MAX;
113
114 #ifdef CONFIG_MODULES
115 extern char modprobe_path[];
116 #endif
117 #ifdef CONFIG_CHR_DEV_SG
118 extern int sg_big_buff;
119 #endif
120
121 #ifdef CONFIG_SPARC
122 #include <asm/system.h>
123 #endif
124
125 #ifdef CONFIG_SPARC64
126 extern int sysctl_tsb_ratio;
127 #endif
128
129 #ifdef __hppa__
130 extern int pwrsw_enabled;
131 extern int unaligned_enabled;
132 #endif
133
134 #ifdef CONFIG_S390
135 #ifdef CONFIG_MATHEMU
136 extern int sysctl_ieee_emulation_warnings;
137 #endif
138 extern int sysctl_userprocess_debug;
139 extern int spin_retry;
140 #endif
141
142 #ifdef CONFIG_BSD_PROCESS_ACCT
143 extern int acct_parm[];
144 #endif
145
146 #ifdef CONFIG_IA64
147 extern int no_unaligned_warning;
148 extern int unaligned_dump_stack;
149 #endif
150
151 #ifdef CONFIG_RT_MUTEXES
152 extern int max_lock_depth;
153 #endif
154
155 #ifdef CONFIG_PROC_SYSCTL
156 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
157                   void __user *buffer, size_t *lenp, loff_t *ppos);
158 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
159                                void __user *buffer, size_t *lenp, loff_t *ppos);
160 #endif
161
162 static struct ctl_table root_table[];
163 static struct ctl_table_root sysctl_table_root;
164 static struct ctl_table_header root_table_header = {
165         .count = 1,
166         .ctl_table = root_table,
167         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
168         .root = &sysctl_table_root,
169         .set = &sysctl_table_root.default_set,
170 };
171 static struct ctl_table_root sysctl_table_root = {
172         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
173         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
174 };
175
176 static struct ctl_table kern_table[];
177 static struct ctl_table vm_table[];
178 static struct ctl_table fs_table[];
179 static struct ctl_table debug_table[];
180 static struct ctl_table dev_table[];
181 extern struct ctl_table random_table[];
182 #ifdef CONFIG_INOTIFY_USER
183 extern struct ctl_table inotify_table[];
184 #endif
185 #ifdef CONFIG_EPOLL
186 extern struct ctl_table epoll_table[];
187 #endif
188
189 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
190 int sysctl_legacy_va_layout;
191 #endif
192
193 extern int prove_locking;
194 extern int lock_stat;
195
196 /* The default sysctl tables: */
197
198 static struct ctl_table root_table[] = {
199         {
200                 .ctl_name       = CTL_KERN,
201                 .procname       = "kernel",
202                 .mode           = 0555,
203                 .child          = kern_table,
204         },
205         {
206                 .ctl_name       = CTL_VM,
207                 .procname       = "vm",
208                 .mode           = 0555,
209                 .child          = vm_table,
210         },
211         {
212                 .ctl_name       = CTL_FS,
213                 .procname       = "fs",
214                 .mode           = 0555,
215                 .child          = fs_table,
216         },
217         {
218                 .ctl_name       = CTL_DEBUG,
219                 .procname       = "debug",
220                 .mode           = 0555,
221                 .child          = debug_table,
222         },
223         {
224                 .ctl_name       = CTL_DEV,
225                 .procname       = "dev",
226                 .mode           = 0555,
227                 .child          = dev_table,
228         },
229 /*
230  * NOTE: do not add new entries to this table unless you have read
231  * Documentation/sysctl/ctl_unnumbered.txt
232  */
233         { .ctl_name = 0 }
234 };
235
236 #ifdef CONFIG_SCHED_DEBUG
237 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
238 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
239 static int min_wakeup_granularity_ns;                   /* 0 usecs */
240 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
241 #endif
242
243 static struct ctl_table kern_table[] = {
244 #ifdef CONFIG_SCHED_DEBUG
245         {
246                 .ctl_name       = CTL_UNNUMBERED,
247                 .procname       = "sched_min_granularity_ns",
248                 .data           = &sysctl_sched_min_granularity,
249                 .maxlen         = sizeof(unsigned int),
250                 .mode           = 0644,
251                 .proc_handler   = &sched_nr_latency_handler,
252                 .strategy       = &sysctl_intvec,
253                 .extra1         = &min_sched_granularity_ns,
254                 .extra2         = &max_sched_granularity_ns,
255         },
256         {
257                 .ctl_name       = CTL_UNNUMBERED,
258                 .procname       = "sched_latency_ns",
259                 .data           = &sysctl_sched_latency,
260                 .maxlen         = sizeof(unsigned int),
261                 .mode           = 0644,
262                 .proc_handler   = &sched_nr_latency_handler,
263                 .strategy       = &sysctl_intvec,
264                 .extra1         = &min_sched_granularity_ns,
265                 .extra2         = &max_sched_granularity_ns,
266         },
267         {
268                 .ctl_name       = CTL_UNNUMBERED,
269                 .procname       = "sched_wakeup_granularity_ns",
270                 .data           = &sysctl_sched_wakeup_granularity,
271                 .maxlen         = sizeof(unsigned int),
272                 .mode           = 0644,
273                 .proc_handler   = &proc_dointvec_minmax,
274                 .strategy       = &sysctl_intvec,
275                 .extra1         = &min_wakeup_granularity_ns,
276                 .extra2         = &max_wakeup_granularity_ns,
277         },
278         {
279                 .ctl_name       = CTL_UNNUMBERED,
280                 .procname       = "sched_shares_ratelimit",
281                 .data           = &sysctl_sched_shares_ratelimit,
282                 .maxlen         = sizeof(unsigned int),
283                 .mode           = 0644,
284                 .proc_handler   = &proc_dointvec,
285         },
286         {
287                 .ctl_name       = CTL_UNNUMBERED,
288                 .procname       = "sched_shares_thresh",
289                 .data           = &sysctl_sched_shares_thresh,
290                 .maxlen         = sizeof(unsigned int),
291                 .mode           = 0644,
292                 .proc_handler   = &proc_dointvec_minmax,
293                 .strategy       = &sysctl_intvec,
294                 .extra1         = &zero,
295         },
296         {
297                 .ctl_name       = CTL_UNNUMBERED,
298                 .procname       = "sched_child_runs_first",
299                 .data           = &sysctl_sched_child_runs_first,
300                 .maxlen         = sizeof(unsigned int),
301                 .mode           = 0644,
302                 .proc_handler   = &proc_dointvec,
303         },
304         {
305                 .ctl_name       = CTL_UNNUMBERED,
306                 .procname       = "sched_features",
307                 .data           = &sysctl_sched_features,
308                 .maxlen         = sizeof(unsigned int),
309                 .mode           = 0644,
310                 .proc_handler   = &proc_dointvec,
311         },
312         {
313                 .ctl_name       = CTL_UNNUMBERED,
314                 .procname       = "sched_migration_cost",
315                 .data           = &sysctl_sched_migration_cost,
316                 .maxlen         = sizeof(unsigned int),
317                 .mode           = 0644,
318                 .proc_handler   = &proc_dointvec,
319         },
320         {
321                 .ctl_name       = CTL_UNNUMBERED,
322                 .procname       = "sched_nr_migrate",
323                 .data           = &sysctl_sched_nr_migrate,
324                 .maxlen         = sizeof(unsigned int),
325                 .mode           = 0644,
326                 .proc_handler   = &proc_dointvec,
327         },
328 #endif
329         {
330                 .ctl_name       = CTL_UNNUMBERED,
331                 .procname       = "sched_rt_period_us",
332                 .data           = &sysctl_sched_rt_period,
333                 .maxlen         = sizeof(unsigned int),
334                 .mode           = 0644,
335                 .proc_handler   = &sched_rt_handler,
336         },
337         {
338                 .ctl_name       = CTL_UNNUMBERED,
339                 .procname       = "sched_rt_runtime_us",
340                 .data           = &sysctl_sched_rt_runtime,
341                 .maxlen         = sizeof(int),
342                 .mode           = 0644,
343                 .proc_handler   = &sched_rt_handler,
344         },
345         {
346                 .ctl_name       = CTL_UNNUMBERED,
347                 .procname       = "sched_compat_yield",
348                 .data           = &sysctl_sched_compat_yield,
349                 .maxlen         = sizeof(unsigned int),
350                 .mode           = 0644,
351                 .proc_handler   = &proc_dointvec,
352         },
353 #ifdef CONFIG_PROVE_LOCKING
354         {
355                 .ctl_name       = CTL_UNNUMBERED,
356                 .procname       = "prove_locking",
357                 .data           = &prove_locking,
358                 .maxlen         = sizeof(int),
359                 .mode           = 0644,
360                 .proc_handler   = &proc_dointvec,
361         },
362 #endif
363 #ifdef CONFIG_LOCK_STAT
364         {
365                 .ctl_name       = CTL_UNNUMBERED,
366                 .procname       = "lock_stat",
367                 .data           = &lock_stat,
368                 .maxlen         = sizeof(int),
369                 .mode           = 0644,
370                 .proc_handler   = &proc_dointvec,
371         },
372 #endif
373         {
374                 .ctl_name       = KERN_PANIC,
375                 .procname       = "panic",
376                 .data           = &panic_timeout,
377                 .maxlen         = sizeof(int),
378                 .mode           = 0644,
379                 .proc_handler   = &proc_dointvec,
380         },
381         {
382                 .ctl_name       = KERN_CORE_USES_PID,
383                 .procname       = "core_uses_pid",
384                 .data           = &core_uses_pid,
385                 .maxlen         = sizeof(int),
386                 .mode           = 0644,
387                 .proc_handler   = &proc_dointvec,
388         },
389         {
390                 .ctl_name       = KERN_CORE_PATTERN,
391                 .procname       = "core_pattern",
392                 .data           = core_pattern,
393                 .maxlen         = CORENAME_MAX_SIZE,
394                 .mode           = 0644,
395                 .proc_handler   = &proc_dostring,
396                 .strategy       = &sysctl_string,
397         },
398 #ifdef CONFIG_PROC_SYSCTL
399         {
400                 .procname       = "tainted",
401                 .maxlen         = sizeof(long),
402                 .mode           = 0644,
403                 .proc_handler   = &proc_taint,
404         },
405 #endif
406 #ifdef CONFIG_LATENCYTOP
407         {
408                 .procname       = "latencytop",
409                 .data           = &latencytop_enabled,
410                 .maxlen         = sizeof(int),
411                 .mode           = 0644,
412                 .proc_handler   = &proc_dointvec,
413         },
414 #endif
415 #ifdef CONFIG_BLK_DEV_INITRD
416         {
417                 .ctl_name       = KERN_REALROOTDEV,
418                 .procname       = "real-root-dev",
419                 .data           = &real_root_dev,
420                 .maxlen         = sizeof(int),
421                 .mode           = 0644,
422                 .proc_handler   = &proc_dointvec,
423         },
424 #endif
425         {
426                 .ctl_name       = CTL_UNNUMBERED,
427                 .procname       = "print-fatal-signals",
428                 .data           = &print_fatal_signals,
429                 .maxlen         = sizeof(int),
430                 .mode           = 0644,
431                 .proc_handler   = &proc_dointvec,
432         },
433 #ifdef CONFIG_SPARC
434         {
435                 .ctl_name       = KERN_SPARC_REBOOT,
436                 .procname       = "reboot-cmd",
437                 .data           = reboot_command,
438                 .maxlen         = 256,
439                 .mode           = 0644,
440                 .proc_handler   = &proc_dostring,
441                 .strategy       = &sysctl_string,
442         },
443         {
444                 .ctl_name       = KERN_SPARC_STOP_A,
445                 .procname       = "stop-a",
446                 .data           = &stop_a_enabled,
447                 .maxlen         = sizeof (int),
448                 .mode           = 0644,
449                 .proc_handler   = &proc_dointvec,
450         },
451         {
452                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
453                 .procname       = "scons-poweroff",
454                 .data           = &scons_pwroff,
455                 .maxlen         = sizeof (int),
456                 .mode           = 0644,
457                 .proc_handler   = &proc_dointvec,
458         },
459 #endif
460 #ifdef CONFIG_SPARC64
461         {
462                 .ctl_name       = CTL_UNNUMBERED,
463                 .procname       = "tsb-ratio",
464                 .data           = &sysctl_tsb_ratio,
465                 .maxlen         = sizeof (int),
466                 .mode           = 0644,
467                 .proc_handler   = &proc_dointvec,
468         },
469 #endif
470 #ifdef __hppa__
471         {
472                 .ctl_name       = KERN_HPPA_PWRSW,
473                 .procname       = "soft-power",
474                 .data           = &pwrsw_enabled,
475                 .maxlen         = sizeof (int),
476                 .mode           = 0644,
477                 .proc_handler   = &proc_dointvec,
478         },
479         {
480                 .ctl_name       = KERN_HPPA_UNALIGNED,
481                 .procname       = "unaligned-trap",
482                 .data           = &unaligned_enabled,
483                 .maxlen         = sizeof (int),
484                 .mode           = 0644,
485                 .proc_handler   = &proc_dointvec,
486         },
487 #endif
488         {
489                 .ctl_name       = KERN_CTLALTDEL,
490                 .procname       = "ctrl-alt-del",
491                 .data           = &C_A_D,
492                 .maxlen         = sizeof(int),
493                 .mode           = 0644,
494                 .proc_handler   = &proc_dointvec,
495         },
496 #ifdef CONFIG_FUNCTION_TRACER
497         {
498                 .ctl_name       = CTL_UNNUMBERED,
499                 .procname       = "ftrace_enabled",
500                 .data           = &ftrace_enabled,
501                 .maxlen         = sizeof(int),
502                 .mode           = 0644,
503                 .proc_handler   = &ftrace_enable_sysctl,
504         },
505 #endif
506 #ifdef CONFIG_STACK_TRACER
507         {
508                 .ctl_name       = CTL_UNNUMBERED,
509                 .procname       = "stack_tracer_enabled",
510                 .data           = &stack_tracer_enabled,
511                 .maxlen         = sizeof(int),
512                 .mode           = 0644,
513                 .proc_handler   = &stack_trace_sysctl,
514         },
515 #endif
516 #ifdef CONFIG_TRACING
517         {
518                 .ctl_name       = CTL_UNNUMBERED,
519                 .procname       = "ftrace_dump_on_oops",
520                 .data           = &ftrace_dump_on_oops,
521                 .maxlen         = sizeof(int),
522                 .mode           = 0644,
523                 .proc_handler   = &proc_dointvec,
524         },
525 #endif
526 #ifdef CONFIG_MODULES
527         {
528                 .ctl_name       = KERN_MODPROBE,
529                 .procname       = "modprobe",
530                 .data           = &modprobe_path,
531                 .maxlen         = KMOD_PATH_LEN,
532                 .mode           = 0644,
533                 .proc_handler   = &proc_dostring,
534                 .strategy       = &sysctl_string,
535         },
536 #endif
537 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
538         {
539                 .ctl_name       = KERN_HOTPLUG,
540                 .procname       = "hotplug",
541                 .data           = &uevent_helper,
542                 .maxlen         = UEVENT_HELPER_PATH_LEN,
543                 .mode           = 0644,
544                 .proc_handler   = &proc_dostring,
545                 .strategy       = &sysctl_string,
546         },
547 #endif
548 #ifdef CONFIG_CHR_DEV_SG
549         {
550                 .ctl_name       = KERN_SG_BIG_BUFF,
551                 .procname       = "sg-big-buff",
552                 .data           = &sg_big_buff,
553                 .maxlen         = sizeof (int),
554                 .mode           = 0444,
555                 .proc_handler   = &proc_dointvec,
556         },
557 #endif
558 #ifdef CONFIG_BSD_PROCESS_ACCT
559         {
560                 .ctl_name       = KERN_ACCT,
561                 .procname       = "acct",
562                 .data           = &acct_parm,
563                 .maxlen         = 3*sizeof(int),
564                 .mode           = 0644,
565                 .proc_handler   = &proc_dointvec,
566         },
567 #endif
568 #ifdef CONFIG_MAGIC_SYSRQ
569         {
570                 .ctl_name       = KERN_SYSRQ,
571                 .procname       = "sysrq",
572                 .data           = &__sysrq_enabled,
573                 .maxlen         = sizeof (int),
574                 .mode           = 0644,
575                 .proc_handler   = &proc_dointvec,
576         },
577 #endif
578 #ifdef CONFIG_PROC_SYSCTL
579         {
580                 .procname       = "cad_pid",
581                 .data           = NULL,
582                 .maxlen         = sizeof (int),
583                 .mode           = 0600,
584                 .proc_handler   = &proc_do_cad_pid,
585         },
586 #endif
587         {
588                 .ctl_name       = KERN_MAX_THREADS,
589                 .procname       = "threads-max",
590                 .data           = &max_threads,
591                 .maxlen         = sizeof(int),
592                 .mode           = 0644,
593                 .proc_handler   = &proc_dointvec,
594         },
595         {
596                 .ctl_name       = KERN_RANDOM,
597                 .procname       = "random",
598                 .mode           = 0555,
599                 .child          = random_table,
600         },
601         {
602                 .ctl_name       = KERN_OVERFLOWUID,
603                 .procname       = "overflowuid",
604                 .data           = &overflowuid,
605                 .maxlen         = sizeof(int),
606                 .mode           = 0644,
607                 .proc_handler   = &proc_dointvec_minmax,
608                 .strategy       = &sysctl_intvec,
609                 .extra1         = &minolduid,
610                 .extra2         = &maxolduid,
611         },
612         {
613                 .ctl_name       = KERN_OVERFLOWGID,
614                 .procname       = "overflowgid",
615                 .data           = &overflowgid,
616                 .maxlen         = sizeof(int),
617                 .mode           = 0644,
618                 .proc_handler   = &proc_dointvec_minmax,
619                 .strategy       = &sysctl_intvec,
620                 .extra1         = &minolduid,
621                 .extra2         = &maxolduid,
622         },
623 #ifdef CONFIG_S390
624 #ifdef CONFIG_MATHEMU
625         {
626                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
627                 .procname       = "ieee_emulation_warnings",
628                 .data           = &sysctl_ieee_emulation_warnings,
629                 .maxlen         = sizeof(int),
630                 .mode           = 0644,
631                 .proc_handler   = &proc_dointvec,
632         },
633 #endif
634         {
635                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
636                 .procname       = "userprocess_debug",
637                 .data           = &sysctl_userprocess_debug,
638                 .maxlen         = sizeof(int),
639                 .mode           = 0644,
640                 .proc_handler   = &proc_dointvec,
641         },
642 #endif
643         {
644                 .ctl_name       = KERN_PIDMAX,
645                 .procname       = "pid_max",
646                 .data           = &pid_max,
647                 .maxlen         = sizeof (int),
648                 .mode           = 0644,
649                 .proc_handler   = &proc_dointvec_minmax,
650                 .strategy       = sysctl_intvec,
651                 .extra1         = &pid_max_min,
652                 .extra2         = &pid_max_max,
653         },
654         {
655                 .ctl_name       = KERN_PANIC_ON_OOPS,
656                 .procname       = "panic_on_oops",
657                 .data           = &panic_on_oops,
658                 .maxlen         = sizeof(int),
659                 .mode           = 0644,
660                 .proc_handler   = &proc_dointvec,
661         },
662 #if defined CONFIG_PRINTK
663         {
664                 .ctl_name       = KERN_PRINTK,
665                 .procname       = "printk",
666                 .data           = &console_loglevel,
667                 .maxlen         = 4*sizeof(int),
668                 .mode           = 0644,
669                 .proc_handler   = &proc_dointvec,
670         },
671         {
672                 .ctl_name       = KERN_PRINTK_RATELIMIT,
673                 .procname       = "printk_ratelimit",
674                 .data           = &printk_ratelimit_state.interval,
675                 .maxlen         = sizeof(int),
676                 .mode           = 0644,
677                 .proc_handler   = &proc_dointvec_jiffies,
678                 .strategy       = &sysctl_jiffies,
679         },
680         {
681                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
682                 .procname       = "printk_ratelimit_burst",
683                 .data           = &printk_ratelimit_state.burst,
684                 .maxlen         = sizeof(int),
685                 .mode           = 0644,
686                 .proc_handler   = &proc_dointvec,
687         },
688 #endif
689         {
690                 .ctl_name       = KERN_NGROUPS_MAX,
691                 .procname       = "ngroups_max",
692                 .data           = &ngroups_max,
693                 .maxlen         = sizeof (int),
694                 .mode           = 0444,
695                 .proc_handler   = &proc_dointvec,
696         },
697 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
698         {
699                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
700                 .procname       = "unknown_nmi_panic",
701                 .data           = &unknown_nmi_panic,
702                 .maxlen         = sizeof (int),
703                 .mode           = 0644,
704                 .proc_handler   = &proc_dointvec,
705         },
706         {
707                 .procname       = "nmi_watchdog",
708                 .data           = &nmi_watchdog_enabled,
709                 .maxlen         = sizeof (int),
710                 .mode           = 0644,
711                 .proc_handler   = &proc_nmi_enabled,
712         },
713 #endif
714 #if defined(CONFIG_X86)
715         {
716                 .ctl_name       = KERN_PANIC_ON_NMI,
717                 .procname       = "panic_on_unrecovered_nmi",
718                 .data           = &panic_on_unrecovered_nmi,
719                 .maxlen         = sizeof(int),
720                 .mode           = 0644,
721                 .proc_handler   = &proc_dointvec,
722         },
723         {
724                 .ctl_name       = KERN_BOOTLOADER_TYPE,
725                 .procname       = "bootloader_type",
726                 .data           = &bootloader_type,
727                 .maxlen         = sizeof (int),
728                 .mode           = 0444,
729                 .proc_handler   = &proc_dointvec,
730         },
731         {
732                 .ctl_name       = CTL_UNNUMBERED,
733                 .procname       = "kstack_depth_to_print",
734                 .data           = &kstack_depth_to_print,
735                 .maxlen         = sizeof(int),
736                 .mode           = 0644,
737                 .proc_handler   = &proc_dointvec,
738         },
739         {
740                 .ctl_name       = CTL_UNNUMBERED,
741                 .procname       = "io_delay_type",
742                 .data           = &io_delay_type,
743                 .maxlen         = sizeof(int),
744                 .mode           = 0644,
745                 .proc_handler   = &proc_dointvec,
746         },
747 #endif
748 #if defined(CONFIG_MMU)
749         {
750                 .ctl_name       = KERN_RANDOMIZE,
751                 .procname       = "randomize_va_space",
752                 .data           = &randomize_va_space,
753                 .maxlen         = sizeof(int),
754                 .mode           = 0644,
755                 .proc_handler   = &proc_dointvec,
756         },
757 #endif
758 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
759         {
760                 .ctl_name       = KERN_SPIN_RETRY,
761                 .procname       = "spin_retry",
762                 .data           = &spin_retry,
763                 .maxlen         = sizeof (int),
764                 .mode           = 0644,
765                 .proc_handler   = &proc_dointvec,
766         },
767 #endif
768 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
769         {
770                 .procname       = "acpi_video_flags",
771                 .data           = &acpi_realmode_flags,
772                 .maxlen         = sizeof (unsigned long),
773                 .mode           = 0644,
774                 .proc_handler   = &proc_doulongvec_minmax,
775         },
776 #endif
777 #ifdef CONFIG_IA64
778         {
779                 .ctl_name       = KERN_IA64_UNALIGNED,
780                 .procname       = "ignore-unaligned-usertrap",
781                 .data           = &no_unaligned_warning,
782                 .maxlen         = sizeof (int),
783                 .mode           = 0644,
784                 .proc_handler   = &proc_dointvec,
785         },
786         {
787                 .ctl_name       = CTL_UNNUMBERED,
788                 .procname       = "unaligned-dump-stack",
789                 .data           = &unaligned_dump_stack,
790                 .maxlen         = sizeof (int),
791                 .mode           = 0644,
792                 .proc_handler   = &proc_dointvec,
793         },
794 #endif
795 #ifdef CONFIG_DETECT_SOFTLOCKUP
796         {
797                 .ctl_name       = CTL_UNNUMBERED,
798                 .procname       = "softlockup_panic",
799                 .data           = &softlockup_panic,
800                 .maxlen         = sizeof(int),
801                 .mode           = 0644,
802                 .proc_handler   = &proc_dointvec_minmax,
803                 .strategy       = &sysctl_intvec,
804                 .extra1         = &zero,
805                 .extra2         = &one,
806         },
807         {
808                 .ctl_name       = CTL_UNNUMBERED,
809                 .procname       = "softlockup_thresh",
810                 .data           = &softlockup_thresh,
811                 .maxlen         = sizeof(int),
812                 .mode           = 0644,
813                 .proc_handler   = &proc_dosoftlockup_thresh,
814                 .strategy       = &sysctl_intvec,
815                 .extra1         = &neg_one,
816                 .extra2         = &sixty,
817         },
818         {
819                 .ctl_name       = CTL_UNNUMBERED,
820                 .procname       = "hung_task_check_count",
821                 .data           = &sysctl_hung_task_check_count,
822                 .maxlen         = sizeof(unsigned long),
823                 .mode           = 0644,
824                 .proc_handler   = &proc_doulongvec_minmax,
825                 .strategy       = &sysctl_intvec,
826         },
827         {
828                 .ctl_name       = CTL_UNNUMBERED,
829                 .procname       = "hung_task_timeout_secs",
830                 .data           = &sysctl_hung_task_timeout_secs,
831                 .maxlen         = sizeof(unsigned long),
832                 .mode           = 0644,
833                 .proc_handler   = &proc_doulongvec_minmax,
834                 .strategy       = &sysctl_intvec,
835         },
836         {
837                 .ctl_name       = CTL_UNNUMBERED,
838                 .procname       = "hung_task_warnings",
839                 .data           = &sysctl_hung_task_warnings,
840                 .maxlen         = sizeof(unsigned long),
841                 .mode           = 0644,
842                 .proc_handler   = &proc_doulongvec_minmax,
843                 .strategy       = &sysctl_intvec,
844         },
845 #endif
846 #ifdef CONFIG_COMPAT
847         {
848                 .ctl_name       = KERN_COMPAT_LOG,
849                 .procname       = "compat-log",
850                 .data           = &compat_log,
851                 .maxlen         = sizeof (int),
852                 .mode           = 0644,
853                 .proc_handler   = &proc_dointvec,
854         },
855 #endif
856 #ifdef CONFIG_RT_MUTEXES
857         {
858                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
859                 .procname       = "max_lock_depth",
860                 .data           = &max_lock_depth,
861                 .maxlen         = sizeof(int),
862                 .mode           = 0644,
863                 .proc_handler   = &proc_dointvec,
864         },
865 #endif
866         {
867                 .ctl_name       = CTL_UNNUMBERED,
868                 .procname       = "poweroff_cmd",
869                 .data           = &poweroff_cmd,
870                 .maxlen         = POWEROFF_CMD_PATH_LEN,
871                 .mode           = 0644,
872                 .proc_handler   = &proc_dostring,
873                 .strategy       = &sysctl_string,
874         },
875 #ifdef CONFIG_KEYS
876         {
877                 .ctl_name       = CTL_UNNUMBERED,
878                 .procname       = "keys",
879                 .mode           = 0555,
880                 .child          = key_sysctls,
881         },
882 #endif
883 #ifdef CONFIG_RCU_TORTURE_TEST
884         {
885                 .ctl_name       = CTL_UNNUMBERED,
886                 .procname       = "rcutorture_runnable",
887                 .data           = &rcutorture_runnable,
888                 .maxlen         = sizeof(int),
889                 .mode           = 0644,
890                 .proc_handler   = &proc_dointvec,
891         },
892 #endif
893 #ifdef CONFIG_UNEVICTABLE_LRU
894         {
895                 .ctl_name       = CTL_UNNUMBERED,
896                 .procname       = "scan_unevictable_pages",
897                 .data           = &scan_unevictable_pages,
898                 .maxlen         = sizeof(scan_unevictable_pages),
899                 .mode           = 0644,
900                 .proc_handler   = &scan_unevictable_handler,
901         },
902 #endif
903 /*
904  * NOTE: do not add new entries to this table unless you have read
905  * Documentation/sysctl/ctl_unnumbered.txt
906  */
907         { .ctl_name = 0 }
908 };
909
910 static struct ctl_table vm_table[] = {
911         {
912                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
913                 .procname       = "overcommit_memory",
914                 .data           = &sysctl_overcommit_memory,
915                 .maxlen         = sizeof(sysctl_overcommit_memory),
916                 .mode           = 0644,
917                 .proc_handler   = &proc_dointvec,
918         },
919         {
920                 .ctl_name       = VM_PANIC_ON_OOM,
921                 .procname       = "panic_on_oom",
922                 .data           = &sysctl_panic_on_oom,
923                 .maxlen         = sizeof(sysctl_panic_on_oom),
924                 .mode           = 0644,
925                 .proc_handler   = &proc_dointvec,
926         },
927         {
928                 .ctl_name       = CTL_UNNUMBERED,
929                 .procname       = "oom_kill_allocating_task",
930                 .data           = &sysctl_oom_kill_allocating_task,
931                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
932                 .mode           = 0644,
933                 .proc_handler   = &proc_dointvec,
934         },
935         {
936                 .ctl_name       = CTL_UNNUMBERED,
937                 .procname       = "oom_dump_tasks",
938                 .data           = &sysctl_oom_dump_tasks,
939                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
940                 .mode           = 0644,
941                 .proc_handler   = &proc_dointvec,
942         },
943         {
944                 .ctl_name       = VM_OVERCOMMIT_RATIO,
945                 .procname       = "overcommit_ratio",
946                 .data           = &sysctl_overcommit_ratio,
947                 .maxlen         = sizeof(sysctl_overcommit_ratio),
948                 .mode           = 0644,
949                 .proc_handler   = &proc_dointvec,
950         },
951         {
952                 .ctl_name       = VM_PAGE_CLUSTER,
953                 .procname       = "page-cluster", 
954                 .data           = &page_cluster,
955                 .maxlen         = sizeof(int),
956                 .mode           = 0644,
957                 .proc_handler   = &proc_dointvec,
958         },
959         {
960                 .ctl_name       = VM_DIRTY_BACKGROUND,
961                 .procname       = "dirty_background_ratio",
962                 .data           = &dirty_background_ratio,
963                 .maxlen         = sizeof(dirty_background_ratio),
964                 .mode           = 0644,
965                 .proc_handler   = &dirty_background_ratio_handler,
966                 .strategy       = &sysctl_intvec,
967                 .extra1         = &zero,
968                 .extra2         = &one_hundred,
969         },
970         {
971                 .ctl_name       = CTL_UNNUMBERED,
972                 .procname       = "dirty_background_bytes",
973                 .data           = &dirty_background_bytes,
974                 .maxlen         = sizeof(dirty_background_bytes),
975                 .mode           = 0644,
976                 .proc_handler   = &dirty_background_bytes_handler,
977                 .strategy       = &sysctl_intvec,
978                 .extra1         = &one_ul,
979         },
980         {
981                 .ctl_name       = VM_DIRTY_RATIO,
982                 .procname       = "dirty_ratio",
983                 .data           = &vm_dirty_ratio,
984                 .maxlen         = sizeof(vm_dirty_ratio),
985                 .mode           = 0644,
986                 .proc_handler   = &dirty_ratio_handler,
987                 .strategy       = &sysctl_intvec,
988                 .extra1         = &zero,
989                 .extra2         = &one_hundred,
990         },
991         {
992                 .ctl_name       = CTL_UNNUMBERED,
993                 .procname       = "dirty_bytes",
994                 .data           = &vm_dirty_bytes,
995                 .maxlen         = sizeof(vm_dirty_bytes),
996                 .mode           = 0644,
997                 .proc_handler   = &dirty_bytes_handler,
998                 .strategy       = &sysctl_intvec,
999                 .extra1         = &one_ul,
1000         },
1001         {
1002                 .procname       = "dirty_writeback_centisecs",
1003                 .data           = &dirty_writeback_interval,
1004                 .maxlen         = sizeof(dirty_writeback_interval),
1005                 .mode           = 0644,
1006                 .proc_handler   = &dirty_writeback_centisecs_handler,
1007         },
1008         {
1009                 .procname       = "dirty_expire_centisecs",
1010                 .data           = &dirty_expire_interval,
1011                 .maxlen         = sizeof(dirty_expire_interval),
1012                 .mode           = 0644,
1013                 .proc_handler   = &proc_dointvec_userhz_jiffies,
1014         },
1015         {
1016                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
1017                 .procname       = "nr_pdflush_threads",
1018                 .data           = &nr_pdflush_threads,
1019                 .maxlen         = sizeof nr_pdflush_threads,
1020                 .mode           = 0444 /* read-only*/,
1021                 .proc_handler   = &proc_dointvec,
1022         },
1023         {
1024                 .ctl_name       = VM_SWAPPINESS,
1025                 .procname       = "swappiness",
1026                 .data           = &vm_swappiness,
1027                 .maxlen         = sizeof(vm_swappiness),
1028                 .mode           = 0644,
1029                 .proc_handler   = &proc_dointvec_minmax,
1030                 .strategy       = &sysctl_intvec,
1031                 .extra1         = &zero,
1032                 .extra2         = &one_hundred,
1033         },
1034 #ifdef CONFIG_HUGETLB_PAGE
1035          {
1036                 .procname       = "nr_hugepages",
1037                 .data           = NULL,
1038                 .maxlen         = sizeof(unsigned long),
1039                 .mode           = 0644,
1040                 .proc_handler   = &hugetlb_sysctl_handler,
1041                 .extra1         = (void *)&hugetlb_zero,
1042                 .extra2         = (void *)&hugetlb_infinity,
1043          },
1044          {
1045                 .ctl_name       = VM_HUGETLB_GROUP,
1046                 .procname       = "hugetlb_shm_group",
1047                 .data           = &sysctl_hugetlb_shm_group,
1048                 .maxlen         = sizeof(gid_t),
1049                 .mode           = 0644,
1050                 .proc_handler   = &proc_dointvec,
1051          },
1052          {
1053                 .ctl_name       = CTL_UNNUMBERED,
1054                 .procname       = "hugepages_treat_as_movable",
1055                 .data           = &hugepages_treat_as_movable,
1056                 .maxlen         = sizeof(int),
1057                 .mode           = 0644,
1058                 .proc_handler   = &hugetlb_treat_movable_handler,
1059         },
1060         {
1061                 .ctl_name       = CTL_UNNUMBERED,
1062                 .procname       = "nr_overcommit_hugepages",
1063                 .data           = NULL,
1064                 .maxlen         = sizeof(unsigned long),
1065                 .mode           = 0644,
1066                 .proc_handler   = &hugetlb_overcommit_handler,
1067                 .extra1         = (void *)&hugetlb_zero,
1068                 .extra2         = (void *)&hugetlb_infinity,
1069         },
1070 #endif
1071         {
1072                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
1073                 .procname       = "lowmem_reserve_ratio",
1074                 .data           = &sysctl_lowmem_reserve_ratio,
1075                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1076                 .mode           = 0644,
1077                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1078                 .strategy       = &sysctl_intvec,
1079         },
1080         {
1081                 .ctl_name       = VM_DROP_PAGECACHE,
1082                 .procname       = "drop_caches",
1083                 .data           = &sysctl_drop_caches,
1084                 .maxlen         = sizeof(int),
1085                 .mode           = 0644,
1086                 .proc_handler   = drop_caches_sysctl_handler,
1087                 .strategy       = &sysctl_intvec,
1088         },
1089         {
1090                 .ctl_name       = VM_MIN_FREE_KBYTES,
1091                 .procname       = "min_free_kbytes",
1092                 .data           = &min_free_kbytes,
1093                 .maxlen         = sizeof(min_free_kbytes),
1094                 .mode           = 0644,
1095                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1096                 .strategy       = &sysctl_intvec,
1097                 .extra1         = &zero,
1098         },
1099         {
1100                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1101                 .procname       = "percpu_pagelist_fraction",
1102                 .data           = &percpu_pagelist_fraction,
1103                 .maxlen         = sizeof(percpu_pagelist_fraction),
1104                 .mode           = 0644,
1105                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1106                 .strategy       = &sysctl_intvec,
1107                 .extra1         = &min_percpu_pagelist_fract,
1108         },
1109 #ifdef CONFIG_MMU
1110         {
1111                 .ctl_name       = VM_MAX_MAP_COUNT,
1112                 .procname       = "max_map_count",
1113                 .data           = &sysctl_max_map_count,
1114                 .maxlen         = sizeof(sysctl_max_map_count),
1115                 .mode           = 0644,
1116                 .proc_handler   = &proc_dointvec
1117         },
1118 #else
1119         {
1120                 .ctl_name       = CTL_UNNUMBERED,
1121                 .procname       = "nr_trim_pages",
1122                 .data           = &sysctl_nr_trim_pages,
1123                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1124                 .mode           = 0644,
1125                 .proc_handler   = &proc_dointvec_minmax,
1126                 .strategy       = &sysctl_intvec,
1127                 .extra1         = &zero,
1128         },
1129 #endif
1130         {
1131                 .ctl_name       = VM_LAPTOP_MODE,
1132                 .procname       = "laptop_mode",
1133                 .data           = &laptop_mode,
1134                 .maxlen         = sizeof(laptop_mode),
1135                 .mode           = 0644,
1136                 .proc_handler   = &proc_dointvec_jiffies,
1137                 .strategy       = &sysctl_jiffies,
1138         },
1139         {
1140                 .ctl_name       = VM_BLOCK_DUMP,
1141                 .procname       = "block_dump",
1142                 .data           = &block_dump,
1143                 .maxlen         = sizeof(block_dump),
1144                 .mode           = 0644,
1145                 .proc_handler   = &proc_dointvec,
1146                 .strategy       = &sysctl_intvec,
1147                 .extra1         = &zero,
1148         },
1149         {
1150                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1151                 .procname       = "vfs_cache_pressure",
1152                 .data           = &sysctl_vfs_cache_pressure,
1153                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1154                 .mode           = 0644,
1155                 .proc_handler   = &proc_dointvec,
1156                 .strategy       = &sysctl_intvec,
1157                 .extra1         = &zero,
1158         },
1159 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1160         {
1161                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1162                 .procname       = "legacy_va_layout",
1163                 .data           = &sysctl_legacy_va_layout,
1164                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1165                 .mode           = 0644,
1166                 .proc_handler   = &proc_dointvec,
1167                 .strategy       = &sysctl_intvec,
1168                 .extra1         = &zero,
1169         },
1170 #endif
1171 #ifdef CONFIG_NUMA
1172         {
1173                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1174                 .procname       = "zone_reclaim_mode",
1175                 .data           = &zone_reclaim_mode,
1176                 .maxlen         = sizeof(zone_reclaim_mode),
1177                 .mode           = 0644,
1178                 .proc_handler   = &proc_dointvec,
1179                 .strategy       = &sysctl_intvec,
1180                 .extra1         = &zero,
1181         },
1182         {
1183                 .ctl_name       = VM_MIN_UNMAPPED,
1184                 .procname       = "min_unmapped_ratio",
1185                 .data           = &sysctl_min_unmapped_ratio,
1186                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1187                 .mode           = 0644,
1188                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1189                 .strategy       = &sysctl_intvec,
1190                 .extra1         = &zero,
1191                 .extra2         = &one_hundred,
1192         },
1193         {
1194                 .ctl_name       = VM_MIN_SLAB,
1195                 .procname       = "min_slab_ratio",
1196                 .data           = &sysctl_min_slab_ratio,
1197                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1198                 .mode           = 0644,
1199                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1200                 .strategy       = &sysctl_intvec,
1201                 .extra1         = &zero,
1202                 .extra2         = &one_hundred,
1203         },
1204 #endif
1205 #ifdef CONFIG_SMP
1206         {
1207                 .ctl_name       = CTL_UNNUMBERED,
1208                 .procname       = "stat_interval",
1209                 .data           = &sysctl_stat_interval,
1210                 .maxlen         = sizeof(sysctl_stat_interval),
1211                 .mode           = 0644,
1212                 .proc_handler   = &proc_dointvec_jiffies,
1213                 .strategy       = &sysctl_jiffies,
1214         },
1215 #endif
1216 #ifdef CONFIG_SECURITY
1217         {
1218                 .ctl_name       = CTL_UNNUMBERED,
1219                 .procname       = "mmap_min_addr",
1220                 .data           = &mmap_min_addr,
1221                 .maxlen         = sizeof(unsigned long),
1222                 .mode           = 0644,
1223                 .proc_handler   = &proc_doulongvec_minmax,
1224         },
1225 #endif
1226 #ifdef CONFIG_NUMA
1227         {
1228                 .ctl_name       = CTL_UNNUMBERED,
1229                 .procname       = "numa_zonelist_order",
1230                 .data           = &numa_zonelist_order,
1231                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1232                 .mode           = 0644,
1233                 .proc_handler   = &numa_zonelist_order_handler,
1234                 .strategy       = &sysctl_string,
1235         },
1236 #endif
1237 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1238    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1239         {
1240                 .ctl_name       = VM_VDSO_ENABLED,
1241                 .procname       = "vdso_enabled",
1242                 .data           = &vdso_enabled,
1243                 .maxlen         = sizeof(vdso_enabled),
1244                 .mode           = 0644,
1245                 .proc_handler   = &proc_dointvec,
1246                 .strategy       = &sysctl_intvec,
1247                 .extra1         = &zero,
1248         },
1249 #endif
1250 #ifdef CONFIG_HIGHMEM
1251         {
1252                 .ctl_name       = CTL_UNNUMBERED,
1253                 .procname       = "highmem_is_dirtyable",
1254                 .data           = &vm_highmem_is_dirtyable,
1255                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1256                 .mode           = 0644,
1257                 .proc_handler   = &proc_dointvec_minmax,
1258                 .strategy       = &sysctl_intvec,
1259                 .extra1         = &zero,
1260                 .extra2         = &one,
1261         },
1262 #endif
1263 /*
1264  * NOTE: do not add new entries to this table unless you have read
1265  * Documentation/sysctl/ctl_unnumbered.txt
1266  */
1267         { .ctl_name = 0 }
1268 };
1269
1270 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1271 static struct ctl_table binfmt_misc_table[] = {
1272         { .ctl_name = 0 }
1273 };
1274 #endif
1275
1276 static struct ctl_table fs_table[] = {
1277         {
1278                 .ctl_name       = FS_NRINODE,
1279                 .procname       = "inode-nr",
1280                 .data           = &inodes_stat,
1281                 .maxlen         = 2*sizeof(int),
1282                 .mode           = 0444,
1283                 .proc_handler   = &proc_dointvec,
1284         },
1285         {
1286                 .ctl_name       = FS_STATINODE,
1287                 .procname       = "inode-state",
1288                 .data           = &inodes_stat,
1289                 .maxlen         = 7*sizeof(int),
1290                 .mode           = 0444,
1291                 .proc_handler   = &proc_dointvec,
1292         },
1293         {
1294                 .procname       = "file-nr",
1295                 .data           = &files_stat,
1296                 .maxlen         = 3*sizeof(int),
1297                 .mode           = 0444,
1298                 .proc_handler   = &proc_nr_files,
1299         },
1300         {
1301                 .ctl_name       = FS_MAXFILE,
1302                 .procname       = "file-max",
1303                 .data           = &files_stat.max_files,
1304                 .maxlen         = sizeof(int),
1305                 .mode           = 0644,
1306                 .proc_handler   = &proc_dointvec,
1307         },
1308         {
1309                 .ctl_name       = CTL_UNNUMBERED,
1310                 .procname       = "nr_open",
1311                 .data           = &sysctl_nr_open,
1312                 .maxlen         = sizeof(int),
1313                 .mode           = 0644,
1314                 .proc_handler   = &proc_dointvec_minmax,
1315                 .extra1         = &sysctl_nr_open_min,
1316                 .extra2         = &sysctl_nr_open_max,
1317         },
1318         {
1319                 .ctl_name       = FS_DENTRY,
1320                 .procname       = "dentry-state",
1321                 .data           = &dentry_stat,
1322                 .maxlen         = 6*sizeof(int),
1323                 .mode           = 0444,
1324                 .proc_handler   = &proc_dointvec,
1325         },
1326         {
1327                 .ctl_name       = FS_OVERFLOWUID,
1328                 .procname       = "overflowuid",
1329                 .data           = &fs_overflowuid,
1330                 .maxlen         = sizeof(int),
1331                 .mode           = 0644,
1332                 .proc_handler   = &proc_dointvec_minmax,
1333                 .strategy       = &sysctl_intvec,
1334                 .extra1         = &minolduid,
1335                 .extra2         = &maxolduid,
1336         },
1337         {
1338                 .ctl_name       = FS_OVERFLOWGID,
1339                 .procname       = "overflowgid",
1340                 .data           = &fs_overflowgid,
1341                 .maxlen         = sizeof(int),
1342                 .mode           = 0644,
1343                 .proc_handler   = &proc_dointvec_minmax,
1344                 .strategy       = &sysctl_intvec,
1345                 .extra1         = &minolduid,
1346                 .extra2         = &maxolduid,
1347         },
1348 #ifdef CONFIG_FILE_LOCKING
1349         {
1350                 .ctl_name       = FS_LEASES,
1351                 .procname       = "leases-enable",
1352                 .data           = &leases_enable,
1353                 .maxlen         = sizeof(int),
1354                 .mode           = 0644,
1355                 .proc_handler   = &proc_dointvec,
1356         },
1357 #endif
1358 #ifdef CONFIG_DNOTIFY
1359         {
1360                 .ctl_name       = FS_DIR_NOTIFY,
1361                 .procname       = "dir-notify-enable",
1362                 .data           = &dir_notify_enable,
1363                 .maxlen         = sizeof(int),
1364                 .mode           = 0644,
1365                 .proc_handler   = &proc_dointvec,
1366         },
1367 #endif
1368 #ifdef CONFIG_MMU
1369 #ifdef CONFIG_FILE_LOCKING
1370         {
1371                 .ctl_name       = FS_LEASE_TIME,
1372                 .procname       = "lease-break-time",
1373                 .data           = &lease_break_time,
1374                 .maxlen         = sizeof(int),
1375                 .mode           = 0644,
1376                 .proc_handler   = &proc_dointvec_minmax,
1377                 .strategy       = &sysctl_intvec,
1378                 .extra1         = &zero,
1379                 .extra2         = &two,
1380         },
1381 #endif
1382 #ifdef CONFIG_AIO
1383         {
1384                 .procname       = "aio-nr",
1385                 .data           = &aio_nr,
1386                 .maxlen         = sizeof(aio_nr),
1387                 .mode           = 0444,
1388                 .proc_handler   = &proc_doulongvec_minmax,
1389         },
1390         {
1391                 .procname       = "aio-max-nr",
1392                 .data           = &aio_max_nr,
1393                 .maxlen         = sizeof(aio_max_nr),
1394                 .mode           = 0644,
1395                 .proc_handler   = &proc_doulongvec_minmax,
1396         },
1397 #endif /* CONFIG_AIO */
1398 #ifdef CONFIG_INOTIFY_USER
1399         {
1400                 .ctl_name       = FS_INOTIFY,
1401                 .procname       = "inotify",
1402                 .mode           = 0555,
1403                 .child          = inotify_table,
1404         },
1405 #endif  
1406 #ifdef CONFIG_EPOLL
1407         {
1408                 .procname       = "epoll",
1409                 .mode           = 0555,
1410                 .child          = epoll_table,
1411         },
1412 #endif
1413 #endif
1414         {
1415                 .ctl_name       = KERN_SETUID_DUMPABLE,
1416                 .procname       = "suid_dumpable",
1417                 .data           = &suid_dumpable,
1418                 .maxlen         = sizeof(int),
1419                 .mode           = 0644,
1420                 .proc_handler   = &proc_dointvec,
1421         },
1422 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1423         {
1424                 .ctl_name       = CTL_UNNUMBERED,
1425                 .procname       = "binfmt_misc",
1426                 .mode           = 0555,
1427                 .child          = binfmt_misc_table,
1428         },
1429 #endif
1430 /*
1431  * NOTE: do not add new entries to this table unless you have read
1432  * Documentation/sysctl/ctl_unnumbered.txt
1433  */
1434         { .ctl_name = 0 }
1435 };
1436
1437 static struct ctl_table debug_table[] = {
1438 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1439         {
1440                 .ctl_name       = CTL_UNNUMBERED,
1441                 .procname       = "exception-trace",
1442                 .data           = &show_unhandled_signals,
1443                 .maxlen         = sizeof(int),
1444                 .mode           = 0644,
1445                 .proc_handler   = proc_dointvec
1446         },
1447 #endif
1448         { .ctl_name = 0 }
1449 };
1450
1451 static struct ctl_table dev_table[] = {
1452         { .ctl_name = 0 }
1453 };
1454
1455 static DEFINE_SPINLOCK(sysctl_lock);
1456
1457 /* called under sysctl_lock */
1458 static int use_table(struct ctl_table_header *p)
1459 {
1460         if (unlikely(p->unregistering))
1461                 return 0;
1462         p->used++;
1463         return 1;
1464 }
1465
1466 /* called under sysctl_lock */
1467 static void unuse_table(struct ctl_table_header *p)
1468 {
1469         if (!--p->used)
1470                 if (unlikely(p->unregistering))
1471                         complete(p->unregistering);
1472 }
1473
1474 /* called under sysctl_lock, will reacquire if has to wait */
1475 static void start_unregistering(struct ctl_table_header *p)
1476 {
1477         /*
1478          * if p->used is 0, nobody will ever touch that entry again;
1479          * we'll eliminate all paths to it before dropping sysctl_lock
1480          */
1481         if (unlikely(p->used)) {
1482                 struct completion wait;
1483                 init_completion(&wait);
1484                 p->unregistering = &wait;
1485                 spin_unlock(&sysctl_lock);
1486                 wait_for_completion(&wait);
1487                 spin_lock(&sysctl_lock);
1488         } else {
1489                 /* anything non-NULL; we'll never dereference it */
1490                 p->unregistering = ERR_PTR(-EINVAL);
1491         }
1492         /*
1493          * do not remove from the list until nobody holds it; walking the
1494          * list in do_sysctl() relies on that.
1495          */
1496         list_del_init(&p->ctl_entry);
1497 }
1498
1499 void sysctl_head_get(struct ctl_table_header *head)
1500 {
1501         spin_lock(&sysctl_lock);
1502         head->count++;
1503         spin_unlock(&sysctl_lock);
1504 }
1505
1506 void sysctl_head_put(struct ctl_table_header *head)
1507 {
1508         spin_lock(&sysctl_lock);
1509         if (!--head->count)
1510                 kfree(head);
1511         spin_unlock(&sysctl_lock);
1512 }
1513
1514 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1515 {
1516         if (!head)
1517                 BUG();
1518         spin_lock(&sysctl_lock);
1519         if (!use_table(head))
1520                 head = ERR_PTR(-ENOENT);
1521         spin_unlock(&sysctl_lock);
1522         return head;
1523 }
1524
1525 void sysctl_head_finish(struct ctl_table_header *head)
1526 {
1527         if (!head)
1528                 return;
1529         spin_lock(&sysctl_lock);
1530         unuse_table(head);
1531         spin_unlock(&sysctl_lock);
1532 }
1533
1534 static struct ctl_table_set *
1535 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1536 {
1537         struct ctl_table_set *set = &root->default_set;
1538         if (root->lookup)
1539                 set = root->lookup(root, namespaces);
1540         return set;
1541 }
1542
1543 static struct list_head *
1544 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1545 {
1546         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1547         return &set->list;
1548 }
1549
1550 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1551                                             struct ctl_table_header *prev)
1552 {
1553         struct ctl_table_root *root;
1554         struct list_head *header_list;
1555         struct ctl_table_header *head;
1556         struct list_head *tmp;
1557
1558         spin_lock(&sysctl_lock);
1559         if (prev) {
1560                 head = prev;
1561                 tmp = &prev->ctl_entry;
1562                 unuse_table(prev);
1563                 goto next;
1564         }
1565         tmp = &root_table_header.ctl_entry;
1566         for (;;) {
1567                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1568
1569                 if (!use_table(head))
1570                         goto next;
1571                 spin_unlock(&sysctl_lock);
1572                 return head;
1573         next:
1574                 root = head->root;
1575                 tmp = tmp->next;
1576                 header_list = lookup_header_list(root, namespaces);
1577                 if (tmp != header_list)
1578                         continue;
1579
1580                 do {
1581                         root = list_entry(root->root_list.next,
1582                                         struct ctl_table_root, root_list);
1583                         if (root == &sysctl_table_root)
1584                                 goto out;
1585                         header_list = lookup_header_list(root, namespaces);
1586                 } while (list_empty(header_list));
1587                 tmp = header_list->next;
1588         }
1589 out:
1590         spin_unlock(&sysctl_lock);
1591         return NULL;
1592 }
1593
1594 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1595 {
1596         return __sysctl_head_next(current->nsproxy, prev);
1597 }
1598
1599 void register_sysctl_root(struct ctl_table_root *root)
1600 {
1601         spin_lock(&sysctl_lock);
1602         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1603         spin_unlock(&sysctl_lock);
1604 }
1605
1606 #ifdef CONFIG_SYSCTL_SYSCALL
1607 /* Perform the actual read/write of a sysctl table entry. */
1608 static int do_sysctl_strategy(struct ctl_table_root *root,
1609                         struct ctl_table *table,
1610                         void __user *oldval, size_t __user *oldlenp,
1611                         void __user *newval, size_t newlen)
1612 {
1613         int op = 0, rc;
1614
1615         if (oldval)
1616                 op |= MAY_READ;
1617         if (newval)
1618                 op |= MAY_WRITE;
1619         if (sysctl_perm(root, table, op))
1620                 return -EPERM;
1621
1622         if (table->strategy) {
1623                 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1624                 if (rc < 0)
1625                         return rc;
1626                 if (rc > 0)
1627                         return 0;
1628         }
1629
1630         /* If there is no strategy routine, or if the strategy returns
1631          * zero, proceed with automatic r/w */
1632         if (table->data && table->maxlen) {
1633                 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1634                 if (rc < 0)
1635                         return rc;
1636         }
1637         return 0;
1638 }
1639
1640 static int parse_table(int __user *name, int nlen,
1641                        void __user *oldval, size_t __user *oldlenp,
1642                        void __user *newval, size_t newlen,
1643                        struct ctl_table_root *root,
1644                        struct ctl_table *table)
1645 {
1646         int n;
1647 repeat:
1648         if (!nlen)
1649                 return -ENOTDIR;
1650         if (get_user(n, name))
1651                 return -EFAULT;
1652         for ( ; table->ctl_name || table->procname; table++) {
1653                 if (!table->ctl_name)
1654                         continue;
1655                 if (n == table->ctl_name) {
1656                         int error;
1657                         if (table->child) {
1658                                 if (sysctl_perm(root, table, MAY_EXEC))
1659                                         return -EPERM;
1660                                 name++;
1661                                 nlen--;
1662                                 table = table->child;
1663                                 goto repeat;
1664                         }
1665                         error = do_sysctl_strategy(root, table,
1666                                                    oldval, oldlenp,
1667                                                    newval, newlen);
1668                         return error;
1669                 }
1670         }
1671         return -ENOTDIR;
1672 }
1673
1674 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1675                void __user *newval, size_t newlen)
1676 {
1677         struct ctl_table_header *head;
1678         int error = -ENOTDIR;
1679
1680         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1681                 return -ENOTDIR;
1682         if (oldval) {
1683                 int old_len;
1684                 if (!oldlenp || get_user(old_len, oldlenp))
1685                         return -EFAULT;
1686         }
1687
1688         for (head = sysctl_head_next(NULL); head;
1689                         head = sysctl_head_next(head)) {
1690                 error = parse_table(name, nlen, oldval, oldlenp, 
1691                                         newval, newlen,
1692                                         head->root, head->ctl_table);
1693                 if (error != -ENOTDIR) {
1694                         sysctl_head_finish(head);
1695                         break;
1696                 }
1697         }
1698         return error;
1699 }
1700
1701 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1702 {
1703         struct __sysctl_args tmp;
1704         int error;
1705
1706         if (copy_from_user(&tmp, args, sizeof(tmp)))
1707                 return -EFAULT;
1708
1709         error = deprecated_sysctl_warning(&tmp);
1710         if (error)
1711                 goto out;
1712
1713         lock_kernel();
1714         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1715                           tmp.newval, tmp.newlen);
1716         unlock_kernel();
1717 out:
1718         return error;
1719 }
1720 #endif /* CONFIG_SYSCTL_SYSCALL */
1721
1722 /*
1723  * sysctl_perm does NOT grant the superuser all rights automatically, because
1724  * some sysctl variables are readonly even to root.
1725  */
1726
1727 static int test_perm(int mode, int op)
1728 {
1729         if (!current_euid())
1730                 mode >>= 6;
1731         else if (in_egroup_p(0))
1732                 mode >>= 3;
1733         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1734                 return 0;
1735         return -EACCES;
1736 }
1737
1738 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1739 {
1740         int error;
1741         int mode;
1742
1743         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1744         if (error)
1745                 return error;
1746
1747         if (root->permissions)
1748                 mode = root->permissions(root, current->nsproxy, table);
1749         else
1750                 mode = table->mode;
1751
1752         return test_perm(mode, op);
1753 }
1754
1755 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1756 {
1757         for (; table->ctl_name || table->procname; table++) {
1758                 table->parent = parent;
1759                 if (table->child)
1760                         sysctl_set_parent(table, table->child);
1761         }
1762 }
1763
1764 static __init int sysctl_init(void)
1765 {
1766         sysctl_set_parent(NULL, root_table);
1767 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1768         {
1769                 int err;
1770                 err = sysctl_check_table(current->nsproxy, root_table);
1771         }
1772 #endif
1773         return 0;
1774 }
1775
1776 core_initcall(sysctl_init);
1777
1778 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1779                                       struct ctl_table *table)
1780 {
1781         struct ctl_table *p;
1782         const char *s = branch->procname;
1783
1784         /* branch should have named subdirectory as its first element */
1785         if (!s || !branch->child)
1786                 return NULL;
1787
1788         /* ... and nothing else */
1789         if (branch[1].procname || branch[1].ctl_name)
1790                 return NULL;
1791
1792         /* table should contain subdirectory with the same name */
1793         for (p = table; p->procname || p->ctl_name; p++) {
1794                 if (!p->child)
1795                         continue;
1796                 if (p->procname && strcmp(p->procname, s) == 0)
1797                         return p;
1798         }
1799         return NULL;
1800 }
1801
1802 /* see if attaching q to p would be an improvement */
1803 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1804 {
1805         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1806         struct ctl_table *next;
1807         int is_better = 0;
1808         int not_in_parent = !p->attached_by;
1809
1810         while ((next = is_branch_in(by, to)) != NULL) {
1811                 if (by == q->attached_by)
1812                         is_better = 1;
1813                 if (to == p->attached_by)
1814                         not_in_parent = 1;
1815                 by = by->child;
1816                 to = next->child;
1817         }
1818
1819         if (is_better && not_in_parent) {
1820                 q->attached_by = by;
1821                 q->attached_to = to;
1822                 q->parent = p;
1823         }
1824 }
1825
1826 /**
1827  * __register_sysctl_paths - register a sysctl hierarchy
1828  * @root: List of sysctl headers to register on
1829  * @namespaces: Data to compute which lists of sysctl entries are visible
1830  * @path: The path to the directory the sysctl table is in.
1831  * @table: the top-level table structure
1832  *
1833  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1834  * array. A completely 0 filled entry terminates the table.
1835  *
1836  * The members of the &struct ctl_table structure are used as follows:
1837  *
1838  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1839  *            must be unique within that level of sysctl
1840  *
1841  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1842  *            enter a sysctl file
1843  *
1844  * data - a pointer to data for use by proc_handler
1845  *
1846  * maxlen - the maximum size in bytes of the data
1847  *
1848  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1849  *
1850  * child - a pointer to the child sysctl table if this entry is a directory, or
1851  *         %NULL.
1852  *
1853  * proc_handler - the text handler routine (described below)
1854  *
1855  * strategy - the strategy routine (described below)
1856  *
1857  * de - for internal use by the sysctl routines
1858  *
1859  * extra1, extra2 - extra pointers usable by the proc handler routines
1860  *
1861  * Leaf nodes in the sysctl tree will be represented by a single file
1862  * under /proc; non-leaf nodes will be represented by directories.
1863  *
1864  * sysctl(2) can automatically manage read and write requests through
1865  * the sysctl table.  The data and maxlen fields of the ctl_table
1866  * struct enable minimal validation of the values being written to be
1867  * performed, and the mode field allows minimal authentication.
1868  *
1869  * More sophisticated management can be enabled by the provision of a
1870  * strategy routine with the table entry.  This will be called before
1871  * any automatic read or write of the data is performed.
1872  *
1873  * The strategy routine may return
1874  *
1875  * < 0 - Error occurred (error is passed to user process)
1876  *
1877  * 0   - OK - proceed with automatic read or write.
1878  *
1879  * > 0 - OK - read or write has been done by the strategy routine, so
1880  *       return immediately.
1881  *
1882  * There must be a proc_handler routine for any terminal nodes
1883  * mirrored under /proc/sys (non-terminals are handled by a built-in
1884  * directory handler).  Several default handlers are available to
1885  * cover common cases -
1886  *
1887  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1888  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 
1889  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1890  *
1891  * It is the handler's job to read the input buffer from user memory
1892  * and process it. The handler should return 0 on success.
1893  *
1894  * This routine returns %NULL on a failure to register, and a pointer
1895  * to the table header on success.
1896  */
1897 struct ctl_table_header *__register_sysctl_paths(
1898         struct ctl_table_root *root,
1899         struct nsproxy *namespaces,
1900         const struct ctl_path *path, struct ctl_table *table)
1901 {
1902         struct ctl_table_header *header;
1903         struct ctl_table *new, **prevp;
1904         unsigned int n, npath;
1905         struct ctl_table_set *set;
1906
1907         /* Count the path components */
1908         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1909                 ;
1910
1911         /*
1912          * For each path component, allocate a 2-element ctl_table array.
1913          * The first array element will be filled with the sysctl entry
1914          * for this, the second will be the sentinel (ctl_name == 0).
1915          *
1916          * We allocate everything in one go so that we don't have to
1917          * worry about freeing additional memory in unregister_sysctl_table.
1918          */
1919         header = kzalloc(sizeof(struct ctl_table_header) +
1920                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1921         if (!header)
1922                 return NULL;
1923
1924         new = (struct ctl_table *) (header + 1);
1925
1926         /* Now connect the dots */
1927         prevp = &header->ctl_table;
1928         for (n = 0; n < npath; ++n, ++path) {
1929                 /* Copy the procname */
1930                 new->procname = path->procname;
1931                 new->ctl_name = path->ctl_name;
1932                 new->mode     = 0555;
1933
1934                 *prevp = new;
1935                 prevp = &new->child;
1936
1937                 new += 2;
1938         }
1939         *prevp = table;
1940         header->ctl_table_arg = table;
1941
1942         INIT_LIST_HEAD(&header->ctl_entry);
1943         header->used = 0;
1944         header->unregistering = NULL;
1945         header->root = root;
1946         sysctl_set_parent(NULL, header->ctl_table);
1947         header->count = 1;
1948 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1949         if (sysctl_check_table(namespaces, header->ctl_table)) {
1950                 kfree(header);
1951                 return NULL;
1952         }
1953 #endif
1954         spin_lock(&sysctl_lock);
1955         header->set = lookup_header_set(root, namespaces);
1956         header->attached_by = header->ctl_table;
1957         header->attached_to = root_table;
1958         header->parent = &root_table_header;
1959         for (set = header->set; set; set = set->parent) {
1960                 struct ctl_table_header *p;
1961                 list_for_each_entry(p, &set->list, ctl_entry) {
1962                         if (p->unregistering)
1963                                 continue;
1964                         try_attach(p, header);
1965                 }
1966         }
1967         header->parent->count++;
1968         list_add_tail(&header->ctl_entry, &header->set->list);
1969         spin_unlock(&sysctl_lock);
1970
1971         return header;
1972 }
1973
1974 /**
1975  * register_sysctl_table_path - register a sysctl table hierarchy
1976  * @path: The path to the directory the sysctl table is in.
1977  * @table: the top-level table structure
1978  *
1979  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1980  * array. A completely 0 filled entry terminates the table.
1981  *
1982  * See __register_sysctl_paths for more details.
1983  */
1984 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1985                                                 struct ctl_table *table)
1986 {
1987         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1988                                         path, table);
1989 }
1990
1991 /**
1992  * register_sysctl_table - register a sysctl table hierarchy
1993  * @table: the top-level table structure
1994  *
1995  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1996  * array. A completely 0 filled entry terminates the table.
1997  *
1998  * See register_sysctl_paths for more details.
1999  */
2000 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2001 {
2002         static const struct ctl_path null_path[] = { {} };
2003
2004         return register_sysctl_paths(null_path, table);
2005 }
2006
2007 /**
2008  * unregister_sysctl_table - unregister a sysctl table hierarchy
2009  * @header: the header returned from register_sysctl_table
2010  *
2011  * Unregisters the sysctl table and all children. proc entries may not
2012  * actually be removed until they are no longer used by anyone.
2013  */
2014 void unregister_sysctl_table(struct ctl_table_header * header)
2015 {
2016         might_sleep();
2017
2018         if (header == NULL)
2019                 return;
2020
2021         spin_lock(&sysctl_lock);
2022         start_unregistering(header);
2023         if (!--header->parent->count) {
2024                 WARN_ON(1);
2025                 kfree(header->parent);
2026         }
2027         if (!--header->count)
2028                 kfree(header);
2029         spin_unlock(&sysctl_lock);
2030 }
2031
2032 int sysctl_is_seen(struct ctl_table_header *p)
2033 {
2034         struct ctl_table_set *set = p->set;
2035         int res;
2036         spin_lock(&sysctl_lock);
2037         if (p->unregistering)
2038                 res = 0;
2039         else if (!set->is_seen)
2040                 res = 1;
2041         else
2042                 res = set->is_seen(set);
2043         spin_unlock(&sysctl_lock);
2044         return res;
2045 }
2046
2047 void setup_sysctl_set(struct ctl_table_set *p,
2048         struct ctl_table_set *parent,
2049         int (*is_seen)(struct ctl_table_set *))
2050 {
2051         INIT_LIST_HEAD(&p->list);
2052         p->parent = parent ? parent : &sysctl_table_root.default_set;
2053         p->is_seen = is_seen;
2054 }
2055
2056 #else /* !CONFIG_SYSCTL */
2057 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2058 {
2059         return NULL;
2060 }
2061
2062 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2063                                                     struct ctl_table *table)
2064 {
2065         return NULL;
2066 }
2067
2068 void unregister_sysctl_table(struct ctl_table_header * table)
2069 {
2070 }
2071
2072 void setup_sysctl_set(struct ctl_table_set *p,
2073         struct ctl_table_set *parent,
2074         int (*is_seen)(struct ctl_table_set *))
2075 {
2076 }
2077
2078 void sysctl_head_put(struct ctl_table_header *head)
2079 {
2080 }
2081
2082 #endif /* CONFIG_SYSCTL */
2083
2084 /*
2085  * /proc/sys support
2086  */
2087
2088 #ifdef CONFIG_PROC_SYSCTL
2089
2090 static int _proc_do_string(void* data, int maxlen, int write,
2091                            struct file *filp, void __user *buffer,
2092                            size_t *lenp, loff_t *ppos)
2093 {
2094         size_t len;
2095         char __user *p;
2096         char c;
2097
2098         if (!data || !maxlen || !*lenp) {
2099                 *lenp = 0;
2100                 return 0;
2101         }
2102
2103         if (write) {
2104                 len = 0;
2105                 p = buffer;
2106                 while (len < *lenp) {
2107                         if (get_user(c, p++))
2108                                 return -EFAULT;
2109                         if (c == 0 || c == '\n')
2110                                 break;
2111                         len++;
2112                 }
2113                 if (len >= maxlen)
2114                         len = maxlen-1;
2115                 if(copy_from_user(data, buffer, len))
2116                         return -EFAULT;
2117                 ((char *) data)[len] = 0;
2118                 *ppos += *lenp;
2119         } else {
2120                 len = strlen(data);
2121                 if (len > maxlen)
2122                         len = maxlen;
2123
2124                 if (*ppos > len) {
2125                         *lenp = 0;
2126                         return 0;
2127                 }
2128
2129                 data += *ppos;
2130                 len  -= *ppos;
2131
2132                 if (len > *lenp)
2133                         len = *lenp;
2134                 if (len)
2135                         if(copy_to_user(buffer, data, len))
2136                                 return -EFAULT;
2137                 if (len < *lenp) {
2138                         if(put_user('\n', ((char __user *) buffer) + len))
2139                                 return -EFAULT;
2140                         len++;
2141                 }
2142                 *lenp = len;
2143                 *ppos += len;
2144         }
2145         return 0;
2146 }
2147
2148 /**
2149  * proc_dostring - read a string sysctl
2150  * @table: the sysctl table
2151  * @write: %TRUE if this is a write to the sysctl file
2152  * @filp: the file structure
2153  * @buffer: the user buffer
2154  * @lenp: the size of the user buffer
2155  * @ppos: file position
2156  *
2157  * Reads/writes a string from/to the user buffer. If the kernel
2158  * buffer provided is not large enough to hold the string, the
2159  * string is truncated. The copied string is %NULL-terminated.
2160  * If the string is being read by the user process, it is copied
2161  * and a newline '\n' is added. It is truncated if the buffer is
2162  * not large enough.
2163  *
2164  * Returns 0 on success.
2165  */
2166 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2167                   void __user *buffer, size_t *lenp, loff_t *ppos)
2168 {
2169         return _proc_do_string(table->data, table->maxlen, write, filp,
2170                                buffer, lenp, ppos);
2171 }
2172
2173
2174 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2175                                  int *valp,
2176                                  int write, void *data)
2177 {
2178         if (write) {
2179                 *valp = *negp ? -*lvalp : *lvalp;
2180         } else {
2181                 int val = *valp;
2182                 if (val < 0) {
2183                         *negp = -1;
2184                         *lvalp = (unsigned long)-val;
2185                 } else {
2186                         *negp = 0;
2187                         *lvalp = (unsigned long)val;
2188                 }
2189         }
2190         return 0;
2191 }
2192
2193 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2194                   int write, struct file *filp, void __user *buffer,
2195                   size_t *lenp, loff_t *ppos,
2196                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2197                               int write, void *data),
2198                   void *data)
2199 {
2200 #define TMPBUFLEN 21
2201         int *i, vleft, first=1, neg, val;
2202         unsigned long lval;
2203         size_t left, len;
2204         
2205         char buf[TMPBUFLEN], *p;
2206         char __user *s = buffer;
2207         
2208         if (!tbl_data || !table->maxlen || !*lenp ||
2209             (*ppos && !write)) {
2210                 *lenp = 0;
2211                 return 0;
2212         }
2213         
2214         i = (int *) tbl_data;
2215         vleft = table->maxlen / sizeof(*i);
2216         left = *lenp;
2217
2218         if (!conv)
2219                 conv = do_proc_dointvec_conv;
2220
2221         for (; left && vleft--; i++, first=0) {
2222                 if (write) {
2223                         while (left) {
2224                                 char c;
2225                                 if (get_user(c, s))
2226                                         return -EFAULT;
2227                                 if (!isspace(c))
2228                                         break;
2229                                 left--;
2230                                 s++;
2231                         }
2232                         if (!left)
2233                                 break;
2234                         neg = 0;
2235                         len = left;
2236                         if (len > sizeof(buf) - 1)
2237                                 len = sizeof(buf) - 1;
2238                         if (copy_from_user(buf, s, len))
2239                                 return -EFAULT;
2240                         buf[len] = 0;
2241                         p = buf;
2242                         if (*p == '-' && left > 1) {
2243                                 neg = 1;
2244                                 p++;
2245                         }
2246                         if (*p < '0' || *p > '9')
2247                                 break;
2248
2249                         lval = simple_strtoul(p, &p, 0);
2250
2251                         len = p-buf;
2252                         if ((len < left) && *p && !isspace(*p))
2253                                 break;
2254                         if (neg)
2255                                 val = -val;
2256                         s += len;
2257                         left -= len;
2258
2259                         if (conv(&neg, &lval, i, 1, data))
2260                                 break;
2261                 } else {
2262                         p = buf;
2263                         if (!first)
2264                                 *p++ = '\t';
2265         
2266                         if (conv(&neg, &lval, i, 0, data))
2267                                 break;
2268
2269                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2270                         len = strlen(buf);
2271                         if (len > left)
2272                                 len = left;
2273                         if(copy_to_user(s, buf, len))
2274                                 return -EFAULT;
2275                         left -= len;
2276                         s += len;
2277                 }
2278         }
2279
2280         if (!write && !first && left) {
2281                 if(put_user('\n', s))
2282                         return -EFAULT;
2283                 left--, s++;
2284         }
2285         if (write) {
2286                 while (left) {
2287                         char c;
2288                         if (get_user(c, s++))
2289                                 return -EFAULT;
2290                         if (!isspace(c))
2291                                 break;
2292                         left--;
2293                 }
2294         }
2295         if (write && first)
2296                 return -EINVAL;
2297         *lenp -= left;
2298         *ppos += *lenp;
2299         return 0;
2300 #undef TMPBUFLEN
2301 }
2302
2303 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2304                   void __user *buffer, size_t *lenp, loff_t *ppos,
2305                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2306                               int write, void *data),
2307                   void *data)
2308 {
2309         return __do_proc_dointvec(table->data, table, write, filp,
2310                         buffer, lenp, ppos, conv, data);
2311 }
2312
2313 /**
2314  * proc_dointvec - read a vector of integers
2315  * @table: the sysctl table
2316  * @write: %TRUE if this is a write to the sysctl file
2317  * @filp: the file structure
2318  * @buffer: the user buffer
2319  * @lenp: the size of the user buffer
2320  * @ppos: file position
2321  *
2322  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2323  * values from/to the user buffer, treated as an ASCII string. 
2324  *
2325  * Returns 0 on success.
2326  */
2327 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2328                      void __user *buffer, size_t *lenp, loff_t *ppos)
2329 {
2330     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2331                             NULL,NULL);
2332 }
2333
2334 /*
2335  * Taint values can only be increased
2336  * This means we can safely use a temporary.
2337  */
2338 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2339                                void __user *buffer, size_t *lenp, loff_t *ppos)
2340 {
2341         struct ctl_table t;
2342         unsigned long tmptaint = get_taint();
2343         int err;
2344
2345         if (write && !capable(CAP_SYS_ADMIN))
2346                 return -EPERM;
2347
2348         t = *table;
2349         t.data = &tmptaint;
2350         err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2351         if (err < 0)
2352                 return err;
2353
2354         if (write) {
2355                 /*
2356                  * Poor man's atomic or. Not worth adding a primitive
2357                  * to everyone's atomic.h for this
2358                  */
2359                 int i;
2360                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2361                         if ((tmptaint >> i) & 1)
2362                                 add_taint(i);
2363                 }
2364         }
2365
2366         return err;
2367 }
2368
2369 struct do_proc_dointvec_minmax_conv_param {
2370         int *min;
2371         int *max;
2372 };
2373
2374 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 
2375                                         int *valp, 
2376                                         int write, void *data)
2377 {
2378         struct do_proc_dointvec_minmax_conv_param *param = data;
2379         if (write) {
2380                 int val = *negp ? -*lvalp : *lvalp;
2381                 if ((param->min && *param->min > val) ||
2382                     (param->max && *param->max < val))
2383                         return -EINVAL;
2384                 *valp = val;
2385         } else {
2386                 int val = *valp;
2387                 if (val < 0) {
2388                         *negp = -1;
2389                         *lvalp = (unsigned long)-val;
2390                 } else {
2391                         *negp = 0;
2392                         *lvalp = (unsigned long)val;
2393                 }
2394         }
2395         return 0;
2396 }
2397
2398 /**
2399  * proc_dointvec_minmax - read a vector of integers with min/max values
2400  * @table: the sysctl table
2401  * @write: %TRUE if this is a write to the sysctl file
2402  * @filp: the file structure
2403  * @buffer: the user buffer
2404  * @lenp: the size of the user buffer
2405  * @ppos: file position
2406  *
2407  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2408  * values from/to the user buffer, treated as an ASCII string.
2409  *
2410  * This routine will ensure the values are within the range specified by
2411  * table->extra1 (min) and table->extra2 (max).
2412  *
2413  * Returns 0 on success.
2414  */
2415 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2416                   void __user *buffer, size_t *lenp, loff_t *ppos)
2417 {
2418         struct do_proc_dointvec_minmax_conv_param param = {
2419                 .min = (int *) table->extra1,
2420                 .max = (int *) table->extra2,
2421         };
2422         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2423                                 do_proc_dointvec_minmax_conv, &param);
2424 }
2425
2426 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2427                                      struct file *filp,
2428                                      void __user *buffer,
2429                                      size_t *lenp, loff_t *ppos,
2430                                      unsigned long convmul,
2431                                      unsigned long convdiv)
2432 {
2433 #define TMPBUFLEN 21
2434         unsigned long *i, *min, *max, val;
2435         int vleft, first=1, neg;
2436         size_t len, left;
2437         char buf[TMPBUFLEN], *p;
2438         char __user *s = buffer;
2439         
2440         if (!data || !table->maxlen || !*lenp ||
2441             (*ppos && !write)) {
2442                 *lenp = 0;
2443                 return 0;
2444         }
2445         
2446         i = (unsigned long *) data;
2447         min = (unsigned long *) table->extra1;
2448         max = (unsigned long *) table->extra2;
2449         vleft = table->maxlen / sizeof(unsigned long);
2450         left = *lenp;
2451         
2452         for (; left && vleft--; i++, min++, max++, first=0) {
2453                 if (write) {
2454                         while (left) {
2455                                 char c;
2456                                 if (get_user(c, s))
2457                                         return -EFAULT;
2458                                 if (!isspace(c))
2459                                         break;
2460                                 left--;
2461                                 s++;
2462                         }
2463                         if (!left)
2464                                 break;
2465                         neg = 0;
2466                         len = left;
2467                         if (len > TMPBUFLEN-1)
2468                                 len = TMPBUFLEN-1;
2469                         if (copy_from_user(buf, s, len))
2470                                 return -EFAULT;
2471                         buf[len] = 0;
2472                         p = buf;
2473                         if (*p == '-' && left > 1) {
2474                                 neg = 1;
2475                                 p++;
2476                         }
2477                         if (*p < '0' || *p > '9')
2478                                 break;
2479                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2480                         len = p-buf;
2481                         if ((len < left) && *p && !isspace(*p))
2482                                 break;
2483                         if (neg)
2484                                 val = -val;
2485                         s += len;
2486                         left -= len;
2487
2488                         if(neg)
2489                                 continue;
2490                         if ((min && val < *min) || (max && val > *max))
2491                                 continue;
2492                         *i = val;
2493                 } else {
2494                         p = buf;
2495                         if (!first)
2496                                 *p++ = '\t';
2497                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2498                         len = strlen(buf);
2499                         if (len > left)
2500                                 len = left;
2501                         if(copy_to_user(s, buf, len))
2502                                 return -EFAULT;
2503                         left -= len;
2504                         s += len;
2505                 }
2506         }
2507
2508         if (!write && !first && left) {
2509                 if(put_user('\n', s))
2510                         return -EFAULT;
2511                 left--, s++;
2512         }
2513         if (write) {
2514                 while (left) {
2515                         char c;
2516                         if (get_user(c, s++))
2517                                 return -EFAULT;
2518                         if (!isspace(c))
2519                                 break;
2520                         left--;
2521                 }
2522         }
2523         if (write && first)
2524                 return -EINVAL;
2525         *lenp -= left;
2526         *ppos += *lenp;
2527         return 0;
2528 #undef TMPBUFLEN
2529 }
2530
2531 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2532                                      struct file *filp,
2533                                      void __user *buffer,
2534                                      size_t *lenp, loff_t *ppos,
2535                                      unsigned long convmul,
2536                                      unsigned long convdiv)
2537 {
2538         return __do_proc_doulongvec_minmax(table->data, table, write,
2539                         filp, buffer, lenp, ppos, convmul, convdiv);
2540 }
2541
2542 /**
2543  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2544  * @table: the sysctl table
2545  * @write: %TRUE if this is a write to the sysctl file
2546  * @filp: the file structure
2547  * @buffer: the user buffer
2548  * @lenp: the size of the user buffer
2549  * @ppos: file position
2550  *
2551  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2552  * values from/to the user buffer, treated as an ASCII string.
2553  *
2554  * This routine will ensure the values are within the range specified by
2555  * table->extra1 (min) and table->extra2 (max).
2556  *
2557  * Returns 0 on success.
2558  */
2559 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2560                            void __user *buffer, size_t *lenp, loff_t *ppos)
2561 {
2562     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2563 }
2564
2565 /**
2566  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2567  * @table: the sysctl table
2568  * @write: %TRUE if this is a write to the sysctl file
2569  * @filp: the file structure
2570  * @buffer: the user buffer
2571  * @lenp: the size of the user buffer
2572  * @ppos: file position
2573  *
2574  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2575  * values from/to the user buffer, treated as an ASCII string. The values
2576  * are treated as milliseconds, and converted to jiffies when they are stored.
2577  *
2578  * This routine will ensure the values are within the range specified by
2579  * table->extra1 (min) and table->extra2 (max).
2580  *
2581  * Returns 0 on success.
2582  */
2583 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2584                                       struct file *filp,
2585                                       void __user *buffer,
2586                                       size_t *lenp, loff_t *ppos)
2587 {
2588     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2589                                      lenp, ppos, HZ, 1000l);
2590 }
2591
2592
2593 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2594                                          int *valp,
2595                                          int write, void *data)
2596 {
2597         if (write) {
2598                 if (*lvalp > LONG_MAX / HZ)
2599                         return 1;
2600                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2601         } else {
2602                 int val = *valp;
2603                 unsigned long lval;
2604                 if (val < 0) {
2605                         *negp = -1;
2606                         lval = (unsigned long)-val;
2607                 } else {
2608                         *negp = 0;
2609                         lval = (unsigned long)val;
2610                 }
2611                 *lvalp = lval / HZ;
2612         }
2613         return 0;
2614 }
2615
2616 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2617                                                 int *valp,
2618                                                 int write, void *data)
2619 {
2620         if (write) {
2621                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2622                         return 1;
2623                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2624         } else {
2625                 int val = *valp;
2626                 unsigned long lval;
2627                 if (val < 0) {
2628                         *negp = -1;
2629                         lval = (unsigned long)-val;
2630                 } else {
2631                         *negp = 0;
2632                         lval = (unsigned long)val;
2633                 }
2634                 *lvalp = jiffies_to_clock_t(lval);
2635         }
2636         return 0;
2637 }
2638
2639 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2640                                             int *valp,
2641                                             int write, void *data)
2642 {
2643         if (write) {
2644                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2645         } else {
2646                 int val = *valp;
2647                 unsigned long lval;
2648                 if (val < 0) {
2649                         *negp = -1;
2650                         lval = (unsigned long)-val;
2651                 } else {
2652                         *negp = 0;
2653                         lval = (unsigned long)val;
2654                 }
2655                 *lvalp = jiffies_to_msecs(lval);
2656         }
2657         return 0;
2658 }
2659
2660 /**
2661  * proc_dointvec_jiffies - read a vector of integers as seconds
2662  * @table: the sysctl table
2663  * @write: %TRUE if this is a write to the sysctl file
2664  * @filp: the file structure
2665  * @buffer: the user buffer
2666  * @lenp: the size of the user buffer
2667  * @ppos: file position
2668  *
2669  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2670  * values from/to the user buffer, treated as an ASCII string. 
2671  * The values read are assumed to be in seconds, and are converted into
2672  * jiffies.
2673  *
2674  * Returns 0 on success.
2675  */
2676 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2677                           void __user *buffer, size_t *lenp, loff_t *ppos)
2678 {
2679     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2680                             do_proc_dointvec_jiffies_conv,NULL);
2681 }
2682
2683 /**
2684  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2685  * @table: the sysctl table
2686  * @write: %TRUE if this is a write to the sysctl file
2687  * @filp: the file structure
2688  * @buffer: the user buffer
2689  * @lenp: the size of the user buffer
2690  * @ppos: pointer to the file position
2691  *
2692  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2693  * values from/to the user buffer, treated as an ASCII string. 
2694  * The values read are assumed to be in 1/USER_HZ seconds, and 
2695  * are converted into jiffies.
2696  *
2697  * Returns 0 on success.
2698  */
2699 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2700                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2701 {
2702     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2703                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2704 }
2705
2706 /**
2707  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2708  * @table: the sysctl table
2709  * @write: %TRUE if this is a write to the sysctl file
2710  * @filp: the file structure
2711  * @buffer: the user buffer
2712  * @lenp: the size of the user buffer
2713  * @ppos: file position
2714  * @ppos: the current position in the file
2715  *
2716  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2717  * values from/to the user buffer, treated as an ASCII string. 
2718  * The values read are assumed to be in 1/1000 seconds, and 
2719  * are converted into jiffies.
2720  *
2721  * Returns 0 on success.
2722  */
2723 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2724                              void __user *buffer, size_t *lenp, loff_t *ppos)
2725 {
2726         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2727                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2728 }
2729
2730 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2731                            void __user *buffer, size_t *lenp, loff_t *ppos)
2732 {
2733         struct pid *new_pid;
2734         pid_t tmp;
2735         int r;
2736
2737         tmp = pid_vnr(cad_pid);
2738
2739         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2740                                lenp, ppos, NULL, NULL);
2741         if (r || !write)
2742                 return r;
2743
2744         new_pid = find_get_pid(tmp);
2745         if (!new_pid)
2746                 return -ESRCH;
2747
2748         put_pid(xchg(&cad_pid, new_pid));
2749         return 0;
2750 }
2751
2752 #else /* CONFIG_PROC_FS */
2753
2754 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2755                   void __user *buffer, size_t *lenp, loff_t *ppos)
2756 {
2757         return -ENOSYS;
2758 }
2759
2760 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2761                   void __user *buffer, size_t *lenp, loff_t *ppos)
2762 {
2763         return -ENOSYS;
2764 }
2765
2766 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2767                     void __user *buffer, size_t *lenp, loff_t *ppos)
2768 {
2769         return -ENOSYS;
2770 }
2771
2772 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2773                     void __user *buffer, size_t *lenp, loff_t *ppos)
2774 {
2775         return -ENOSYS;
2776 }
2777
2778 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2779                     void __user *buffer, size_t *lenp, loff_t *ppos)
2780 {
2781         return -ENOSYS;
2782 }
2783
2784 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2785                              void __user *buffer, size_t *lenp, loff_t *ppos)
2786 {
2787         return -ENOSYS;
2788 }
2789
2790 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2791                     void __user *buffer, size_t *lenp, loff_t *ppos)
2792 {
2793         return -ENOSYS;
2794 }
2795
2796 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2797                                       struct file *filp,
2798                                       void __user *buffer,
2799                                       size_t *lenp, loff_t *ppos)
2800 {
2801     return -ENOSYS;
2802 }
2803
2804
2805 #endif /* CONFIG_PROC_FS */
2806
2807
2808 #ifdef CONFIG_SYSCTL_SYSCALL
2809 /*
2810  * General sysctl support routines 
2811  */
2812
2813 /* The generic sysctl data routine (used if no strategy routine supplied) */
2814 int sysctl_data(struct ctl_table *table,
2815                 void __user *oldval, size_t __user *oldlenp,
2816                 void __user *newval, size_t newlen)
2817 {
2818         size_t len;
2819
2820         /* Get out of I don't have a variable */
2821         if (!table->data || !table->maxlen)
2822                 return -ENOTDIR;
2823
2824         if (oldval && oldlenp) {
2825                 if (get_user(len, oldlenp))
2826                         return -EFAULT;
2827                 if (len) {
2828                         if (len > table->maxlen)
2829                                 len = table->maxlen;
2830                         if (copy_to_user(oldval, table->data, len))
2831                                 return -EFAULT;
2832                         if (put_user(len, oldlenp))
2833                                 return -EFAULT;
2834                 }
2835         }
2836
2837         if (newval && newlen) {
2838                 if (newlen > table->maxlen)
2839                         newlen = table->maxlen;
2840
2841                 if (copy_from_user(table->data, newval, newlen))
2842                         return -EFAULT;
2843         }
2844         return 1;
2845 }
2846
2847 /* The generic string strategy routine: */
2848 int sysctl_string(struct ctl_table *table,
2849                   void __user *oldval, size_t __user *oldlenp,
2850                   void __user *newval, size_t newlen)
2851 {
2852         if (!table->data || !table->maxlen) 
2853                 return -ENOTDIR;
2854         
2855         if (oldval && oldlenp) {
2856                 size_t bufsize;
2857                 if (get_user(bufsize, oldlenp))
2858                         return -EFAULT;
2859                 if (bufsize) {
2860                         size_t len = strlen(table->data), copied;
2861
2862                         /* This shouldn't trigger for a well-formed sysctl */
2863                         if (len > table->maxlen)
2864                                 len = table->maxlen;
2865
2866                         /* Copy up to a max of bufsize-1 bytes of the string */
2867                         copied = (len >= bufsize) ? bufsize - 1 : len;
2868
2869                         if (copy_to_user(oldval, table->data, copied) ||
2870                             put_user(0, (char __user *)(oldval + copied)))
2871                                 return -EFAULT;
2872                         if (put_user(len, oldlenp))
2873                                 return -EFAULT;
2874                 }
2875         }
2876         if (newval && newlen) {
2877                 size_t len = newlen;
2878                 if (len > table->maxlen)
2879                         len = table->maxlen;
2880                 if(copy_from_user(table->data, newval, len))
2881                         return -EFAULT;
2882                 if (len == table->maxlen)
2883                         len--;
2884                 ((char *) table->data)[len] = 0;
2885         }
2886         return 1;
2887 }
2888
2889 /*
2890  * This function makes sure that all of the integers in the vector
2891  * are between the minimum and maximum values given in the arrays
2892  * table->extra1 and table->extra2, respectively.
2893  */
2894 int sysctl_intvec(struct ctl_table *table,
2895                 void __user *oldval, size_t __user *oldlenp,
2896                 void __user *newval, size_t newlen)
2897 {
2898
2899         if (newval && newlen) {
2900                 int __user *vec = (int __user *) newval;
2901                 int *min = (int *) table->extra1;
2902                 int *max = (int *) table->extra2;
2903                 size_t length;
2904                 int i;
2905
2906                 if (newlen % sizeof(int) != 0)
2907                         return -EINVAL;
2908
2909                 if (!table->extra1 && !table->extra2)
2910                         return 0;
2911
2912                 if (newlen > table->maxlen)
2913                         newlen = table->maxlen;
2914                 length = newlen / sizeof(int);
2915
2916                 for (i = 0; i < length; i++) {
2917                         int value;
2918                         if (get_user(value, vec + i))
2919                                 return -EFAULT;
2920                         if (min && value < min[i])
2921                                 return -EINVAL;
2922                         if (max && value > max[i])
2923                                 return -EINVAL;
2924                 }
2925         }
2926         return 0;
2927 }
2928
2929 /* Strategy function to convert jiffies to seconds */ 
2930 int sysctl_jiffies(struct ctl_table *table,
2931                 void __user *oldval, size_t __user *oldlenp,
2932                 void __user *newval, size_t newlen)
2933 {
2934         if (oldval && oldlenp) {
2935                 size_t olen;
2936
2937                 if (get_user(olen, oldlenp))
2938                         return -EFAULT;
2939                 if (olen) {
2940                         int val;
2941
2942                         if (olen < sizeof(int))
2943                                 return -EINVAL;
2944
2945                         val = *(int *)(table->data) / HZ;
2946                         if (put_user(val, (int __user *)oldval))
2947                                 return -EFAULT;
2948                         if (put_user(sizeof(int), oldlenp))
2949                                 return -EFAULT;
2950                 }
2951         }
2952         if (newval && newlen) { 
2953                 int new;
2954                 if (newlen != sizeof(int))
2955                         return -EINVAL; 
2956                 if (get_user(new, (int __user *)newval))
2957                         return -EFAULT;
2958                 *(int *)(table->data) = new*HZ; 
2959         }
2960         return 1;
2961 }
2962
2963 /* Strategy function to convert jiffies to seconds */ 
2964 int sysctl_ms_jiffies(struct ctl_table *table,
2965                 void __user *oldval, size_t __user *oldlenp,
2966                 void __user *newval, size_t newlen)
2967 {
2968         if (oldval && oldlenp) {
2969                 size_t olen;
2970
2971                 if (get_user(olen, oldlenp))
2972                         return -EFAULT;
2973                 if (olen) {
2974                         int val;
2975
2976                         if (olen < sizeof(int))
2977                                 return -EINVAL;
2978
2979                         val = jiffies_to_msecs(*(int *)(table->data));
2980                         if (put_user(val, (int __user *)oldval))
2981                                 return -EFAULT;
2982                         if (put_user(sizeof(int), oldlenp))
2983                                 return -EFAULT;
2984                 }
2985         }
2986         if (newval && newlen) { 
2987                 int new;
2988                 if (newlen != sizeof(int))
2989                         return -EINVAL; 
2990                 if (get_user(new, (int __user *)newval))
2991                         return -EFAULT;
2992                 *(int *)(table->data) = msecs_to_jiffies(new);
2993         }
2994         return 1;
2995 }
2996
2997
2998
2999 #else /* CONFIG_SYSCTL_SYSCALL */
3000
3001
3002 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
3003 {
3004         struct __sysctl_args tmp;
3005         int error;
3006
3007         if (copy_from_user(&tmp, args, sizeof(tmp)))
3008                 return -EFAULT;
3009
3010         error = deprecated_sysctl_warning(&tmp);
3011
3012         /* If no error reading the parameters then just -ENOSYS ... */
3013         if (!error)
3014                 error = -ENOSYS;
3015
3016         return error;
3017 }
3018
3019 int sysctl_data(struct ctl_table *table,
3020                   void __user *oldval, size_t __user *oldlenp,
3021                   void __user *newval, size_t newlen)
3022 {
3023         return -ENOSYS;
3024 }
3025
3026 int sysctl_string(struct ctl_table *table,
3027                   void __user *oldval, size_t __user *oldlenp,
3028                   void __user *newval, size_t newlen)
3029 {
3030         return -ENOSYS;
3031 }
3032
3033 int sysctl_intvec(struct ctl_table *table,
3034                 void __user *oldval, size_t __user *oldlenp,
3035                 void __user *newval, size_t newlen)
3036 {
3037         return -ENOSYS;
3038 }
3039
3040 int sysctl_jiffies(struct ctl_table *table,
3041                 void __user *oldval, size_t __user *oldlenp,
3042                 void __user *newval, size_t newlen)
3043 {
3044         return -ENOSYS;
3045 }
3046
3047 int sysctl_ms_jiffies(struct ctl_table *table,
3048                 void __user *oldval, size_t __user *oldlenp,
3049                 void __user *newval, size_t newlen)
3050 {
3051         return -ENOSYS;
3052 }
3053
3054 #endif /* CONFIG_SYSCTL_SYSCALL */
3055
3056 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3057 {
3058         static int msg_count;
3059         int name[CTL_MAXNAME];
3060         int i;
3061
3062         /* Check args->nlen. */
3063         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3064                 return -ENOTDIR;
3065
3066         /* Read in the sysctl name for better debug message logging */
3067         for (i = 0; i < args->nlen; i++)
3068                 if (get_user(name[i], args->name + i))
3069                         return -EFAULT;
3070
3071         /* Ignore accesses to kernel.version */
3072         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3073                 return 0;
3074
3075         if (msg_count < 5) {
3076                 msg_count++;
3077                 printk(KERN_INFO
3078                         "warning: process `%s' used the deprecated sysctl "
3079                         "system call with ", current->comm);
3080                 for (i = 0; i < args->nlen; i++)
3081                         printk("%d.", name[i]);
3082                 printk("\n");
3083         }
3084         return 0;
3085 }
3086
3087 /*
3088  * No sense putting this after each symbol definition, twice,
3089  * exception granted :-)
3090  */
3091 EXPORT_SYMBOL(proc_dointvec);
3092 EXPORT_SYMBOL(proc_dointvec_jiffies);
3093 EXPORT_SYMBOL(proc_dointvec_minmax);
3094 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3095 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3096 EXPORT_SYMBOL(proc_dostring);
3097 EXPORT_SYMBOL(proc_doulongvec_minmax);
3098 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3099 EXPORT_SYMBOL(register_sysctl_table);
3100 EXPORT_SYMBOL(register_sysctl_paths);
3101 EXPORT_SYMBOL(sysctl_intvec);
3102 EXPORT_SYMBOL(sysctl_jiffies);
3103 EXPORT_SYMBOL(sysctl_ms_jiffies);
3104 EXPORT_SYMBOL(sysctl_string);
3105 EXPORT_SYMBOL(sysctl_data);
3106 EXPORT_SYMBOL(unregister_sysctl_table);