?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[PATCH] com20020_cs: more device support
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / sysctl.c
blobee0db45e2438e42ec87e6681fc94fbf3c92c90ec
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/proc_fs.h>
28 #include <linux/capability.h>
29 #include <linux/ctype.h>
30 #include <linux/utsname.h>
31 #include <linux/capability.h>
32 #include <linux/smp_lock.h>
33 #include <linux/init.h>
34 #include <linux/kernel.h>
35 #include <linux/kobject.h>
36 #include <linux/net.h>
37 #include <linux/sysrq.h>
38 #include <linux/highuid.h>
39 #include <linux/writeback.h>
40 #include <linux/hugetlb.h>
41 #include <linux/security.h>
42 #include <linux/initrd.h>
43 #include <linux/times.h>
44 #include <linux/limits.h>
45 #include <linux/dcache.h>
46 #include <linux/syscalls.h>
47 #include <linux/nfs_fs.h>
48 #include <linux/acpi.h>
49
50 #include <asm/uaccess.h>
51 #include <asm/processor.h>
52
53 extern int proc_nr_files(ctl_table *table, int write, struct file *filp,
54 void __user *buffer, size_t *lenp, loff_t *ppos);
55
56 #if defined(CONFIG_SYSCTL)
57
58 /* External variables not in a header file. */
59 extern int C_A_D;
60 extern int sysctl_overcommit_memory;
61 extern int sysctl_overcommit_ratio;
62 extern int sysctl_panic_on_oom;
63 extern int max_threads;
64 extern int sysrq_enabled;
65 extern int core_uses_pid;
66 extern int suid_dumpable;
67 extern char core_pattern[];
68 extern int cad_pid;
69 extern int pid_max;
70 extern int min_free_kbytes;
71 extern int printk_ratelimit_jiffies;
72 extern int printk_ratelimit_burst;
73 extern int pid_max_min, pid_max_max;
74 extern int sysctl_drop_caches;
75 extern int percpu_pagelist_fraction;
76 extern int compat_log;
77
78 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
79 int unknown_nmi_panic;
80 extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
81 void __user *, size_t *, loff_t *);
82 #endif
83
84 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
85 static int maxolduid = 65535;
86 static int minolduid;
87 static int min_percpu_pagelist_fract = 8;
88
89 static int ngroups_max = NGROUPS_MAX;
90
91 #ifdef CONFIG_KMOD
92 extern char modprobe_path[];
93 #endif
94 #ifdef CONFIG_CHR_DEV_SG
95 extern int sg_big_buff;
96 #endif
97 #ifdef CONFIG_SYSVIPC
98 extern size_t shm_ctlmax;
99 extern size_t shm_ctlall;
100 extern int shm_ctlmni;
101 extern int msg_ctlmax;
102 extern int msg_ctlmnb;
103 extern int msg_ctlmni;
104 extern int sem_ctls[];
105 #endif
106
107 #ifdef __sparc__
108 extern char reboot_command [];
109 extern int stop_a_enabled;
110 extern int scons_pwroff;
111 #endif
112
113 #ifdef __hppa__
114 extern int pwrsw_enabled;
115 extern int unaligned_enabled;
116 #endif
117
118 #ifdef CONFIG_S390
119 #ifdef CONFIG_MATHEMU
120 extern int sysctl_ieee_emulation_warnings;
121 #endif
122 extern int sysctl_userprocess_debug;
123 extern int spin_retry;
124 #endif
125
126 extern int sysctl_hz_timer;
127
128 #ifdef CONFIG_BSD_PROCESS_ACCT
129 extern int acct_parm[];
130 #endif
131
132 #ifdef CONFIG_IA64
133 extern int no_unaligned_warning;
134 #endif
135
136 #ifdef CONFIG_RT_MUTEXES
137 extern int max_lock_depth;
138 #endif
139
140 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
141 ctl_table *, void **);
142 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
143 void __user *buffer, size_t *lenp, loff_t *ppos);
144
145 static ctl_table root_table[];
146 static struct ctl_table_header root_table_header =
147 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
148
149 static ctl_table kern_table[];
150 static ctl_table vm_table[];
151 static ctl_table fs_table[];
152 static ctl_table debug_table[];
153 static ctl_table dev_table[];
154 extern ctl_table random_table[];
155 #ifdef CONFIG_UNIX98_PTYS
156 extern ctl_table pty_table[];
157 #endif
158 #ifdef CONFIG_INOTIFY_USER
159 extern ctl_table inotify_table[];
160 #endif
161
162 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
163 int sysctl_legacy_va_layout;
164 #endif
165
166 /* /proc declarations: */
167
168 #ifdef CONFIG_PROC_FS
169
170 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
171 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
172 static int proc_opensys(struct inode *, struct file *);
173
174 struct file_operations proc_sys_file_operations = {
175 .open = proc_opensys,
176 .read = proc_readsys,
177 .write = proc_writesys,
178 };
179
180 extern struct proc_dir_entry *proc_sys_root;
181
182 static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *);
183 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
184 #endif
185
186 /* The default sysctl tables: */
187
188 static ctl_table root_table[] = {
189 {
190 .ctl_name = CTL_KERN,
191 .procname = "kernel",
192 .mode = 0555,
193 .child = kern_table,
194 },
195 {
196 .ctl_name = CTL_VM,
197 .procname = "vm",
198 .mode = 0555,
199 .child = vm_table,
200 },
201 #ifdef CONFIG_NET
202 {
203 .ctl_name = CTL_NET,
204 .procname = "net",
205 .mode = 0555,
206 .child = net_table,
207 },
208 #endif
209 {
210 .ctl_name = CTL_FS,
211 .procname = "fs",
212 .mode = 0555,
213 .child = fs_table,
214 },
215 {
216 .ctl_name = CTL_DEBUG,
217 .procname = "debug",
218 .mode = 0555,
219 .child = debug_table,
220 },
221 {
222 .ctl_name = CTL_DEV,
223 .procname = "dev",
224 .mode = 0555,
225 .child = dev_table,
226 },
227
228 { .ctl_name = 0 }
229 };
230
231 static ctl_table kern_table[] = {
232 {
233 .ctl_name = KERN_OSTYPE,
234 .procname = "ostype",
235 .data = system_utsname.sysname,
236 .maxlen = sizeof(system_utsname.sysname),
237 .mode = 0444,
238 .proc_handler = &proc_doutsstring,
239 .strategy = &sysctl_string,
240 },
241 {
242 .ctl_name = KERN_OSRELEASE,
243 .procname = "osrelease",
244 .data = system_utsname.release,
245 .maxlen = sizeof(system_utsname.release),
246 .mode = 0444,
247 .proc_handler = &proc_doutsstring,
248 .strategy = &sysctl_string,
249 },
250 {
251 .ctl_name = KERN_VERSION,
252 .procname = "version",
253 .data = system_utsname.version,
254 .maxlen = sizeof(system_utsname.version),
255 .mode = 0444,
256 .proc_handler = &proc_doutsstring,
257 .strategy = &sysctl_string,
258 },
259 {
260 .ctl_name = KERN_NODENAME,
261 .procname = "hostname",
262 .data = system_utsname.nodename,
263 .maxlen = sizeof(system_utsname.nodename),
264 .mode = 0644,
265 .proc_handler = &proc_doutsstring,
266 .strategy = &sysctl_string,
267 },
268 {
269 .ctl_name = KERN_DOMAINNAME,
270 .procname = "domainname",
271 .data = system_utsname.domainname,
272 .maxlen = sizeof(system_utsname.domainname),
273 .mode = 0644,
274 .proc_handler = &proc_doutsstring,
275 .strategy = &sysctl_string,
276 },
277 {
278 .ctl_name = KERN_PANIC,
279 .procname = "panic",
280 .data = &panic_timeout,
281 .maxlen = sizeof(int),
282 .mode = 0644,
283 .proc_handler = &proc_dointvec,
284 },
285 {
286 .ctl_name = KERN_CORE_USES_PID,
287 .procname = "core_uses_pid",
288 .data = &core_uses_pid,
289 .maxlen = sizeof(int),
290 .mode = 0644,
291 .proc_handler = &proc_dointvec,
292 },
293 {
294 .ctl_name = KERN_CORE_PATTERN,
295 .procname = "core_pattern",
296 .data = core_pattern,
297 .maxlen = 64,
298 .mode = 0644,
299 .proc_handler = &proc_dostring,
300 .strategy = &sysctl_string,
301 },
302 {
303 .ctl_name = KERN_TAINTED,
304 .procname = "tainted",
305 .data = &tainted,
306 .maxlen = sizeof(int),
307 .mode = 0444,
308 .proc_handler = &proc_dointvec,
309 },
310 {
311 .ctl_name = KERN_CAP_BSET,
312 .procname = "cap-bound",
313 .data = &cap_bset,
314 .maxlen = sizeof(kernel_cap_t),
315 .mode = 0600,
316 .proc_handler = &proc_dointvec_bset,
317 },
318 #ifdef CONFIG_BLK_DEV_INITRD
319 {
320 .ctl_name = KERN_REALROOTDEV,
321 .procname = "real-root-dev",
322 .data = &real_root_dev,
323 .maxlen = sizeof(int),
324 .mode = 0644,
325 .proc_handler = &proc_dointvec,
326 },
327 #endif
328 #ifdef __sparc__
329 {
330 .ctl_name = KERN_SPARC_REBOOT,
331 .procname = "reboot-cmd",
332 .data = reboot_command,
333 .maxlen = 256,
334 .mode = 0644,
335 .proc_handler = &proc_dostring,
336 .strategy = &sysctl_string,
337 },
338 {
339 .ctl_name = KERN_SPARC_STOP_A,
340 .procname = "stop-a",
341 .data = &stop_a_enabled,
342 .maxlen = sizeof (int),
343 .mode = 0644,
344 .proc_handler = &proc_dointvec,
345 },
346 {
347 .ctl_name = KERN_SPARC_SCONS_PWROFF,
348 .procname = "scons-poweroff",
349 .data = &scons_pwroff,
350 .maxlen = sizeof (int),
351 .mode = 0644,
352 .proc_handler = &proc_dointvec,
353 },
354 #endif
355 #ifdef __hppa__
356 {
357 .ctl_name = KERN_HPPA_PWRSW,
358 .procname = "soft-power",
359 .data = &pwrsw_enabled,
360 .maxlen = sizeof (int),
361 .mode = 0644,
362 .proc_handler = &proc_dointvec,
363 },
364 {
365 .ctl_name = KERN_HPPA_UNALIGNED,
366 .procname = "unaligned-trap",
367 .data = &unaligned_enabled,
368 .maxlen = sizeof (int),
369 .mode = 0644,
370 .proc_handler = &proc_dointvec,
371 },
372 #endif
373 {
374 .ctl_name = KERN_CTLALTDEL,
375 .procname = "ctrl-alt-del",
376 .data = &C_A_D,
377 .maxlen = sizeof(int),
378 .mode = 0644,
379 .proc_handler = &proc_dointvec,
380 },
381 {
382 .ctl_name = KERN_PRINTK,
383 .procname = "printk",
384 .data = &console_loglevel,
385 .maxlen = 4*sizeof(int),
386 .mode = 0644,
387 .proc_handler = &proc_dointvec,
388 },
389 #ifdef CONFIG_KMOD
390 {
391 .ctl_name = KERN_MODPROBE,
392 .procname = "modprobe",
393 .data = &modprobe_path,
394 .maxlen = KMOD_PATH_LEN,
395 .mode = 0644,
396 .proc_handler = &proc_dostring,
397 .strategy = &sysctl_string,
398 },
399 #endif
400 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
401 {
402 .ctl_name = KERN_HOTPLUG,
403 .procname = "hotplug",
404 .data = &uevent_helper,
405 .maxlen = UEVENT_HELPER_PATH_LEN,
406 .mode = 0644,
407 .proc_handler = &proc_dostring,
408 .strategy = &sysctl_string,
409 },
410 #endif
411 #ifdef CONFIG_CHR_DEV_SG
412 {
413 .ctl_name = KERN_SG_BIG_BUFF,
414 .procname = "sg-big-buff",
415 .data = &sg_big_buff,
416 .maxlen = sizeof (int),
417 .mode = 0444,
418 .proc_handler = &proc_dointvec,
419 },
420 #endif
421 #ifdef CONFIG_BSD_PROCESS_ACCT
422 {
423 .ctl_name = KERN_ACCT,
424 .procname = "acct",
425 .data = &acct_parm,
426 .maxlen = 3*sizeof(int),
427 .mode = 0644,
428 .proc_handler = &proc_dointvec,
429 },
430 #endif
431 #ifdef CONFIG_SYSVIPC
432 {
433 .ctl_name = KERN_SHMMAX,
434 .procname = "shmmax",
435 .data = &shm_ctlmax,
436 .maxlen = sizeof (size_t),
437 .mode = 0644,
438 .proc_handler = &proc_doulongvec_minmax,
439 },
440 {
441 .ctl_name = KERN_SHMALL,
442 .procname = "shmall",
443 .data = &shm_ctlall,
444 .maxlen = sizeof (size_t),
445 .mode = 0644,
446 .proc_handler = &proc_doulongvec_minmax,
447 },
448 {
449 .ctl_name = KERN_SHMMNI,
450 .procname = "shmmni",
451 .data = &shm_ctlmni,
452 .maxlen = sizeof (int),
453 .mode = 0644,
454 .proc_handler = &proc_dointvec,
455 },
456 {
457 .ctl_name = KERN_MSGMAX,
458 .procname = "msgmax",
459 .data = &msg_ctlmax,
460 .maxlen = sizeof (int),
461 .mode = 0644,
462 .proc_handler = &proc_dointvec,
463 },
464 {
465 .ctl_name = KERN_MSGMNI,
466 .procname = "msgmni",
467 .data = &msg_ctlmni,
468 .maxlen = sizeof (int),
469 .mode = 0644,
470 .proc_handler = &proc_dointvec,
471 },
472 {
473 .ctl_name = KERN_MSGMNB,
474 .procname = "msgmnb",
475 .data = &msg_ctlmnb,
476 .maxlen = sizeof (int),
477 .mode = 0644,
478 .proc_handler = &proc_dointvec,
479 },
480 {
481 .ctl_name = KERN_SEM,
482 .procname = "sem",
483 .data = &sem_ctls,
484 .maxlen = 4*sizeof (int),
485 .mode = 0644,
486 .proc_handler = &proc_dointvec,
487 },
488 #endif
489 #ifdef CONFIG_MAGIC_SYSRQ
490 {
491 .ctl_name = KERN_SYSRQ,
492 .procname = "sysrq",
493 .data = &sysrq_enabled,
494 .maxlen = sizeof (int),
495 .mode = 0644,
496 .proc_handler = &proc_dointvec,
497 },
498 #endif
499 {
500 .ctl_name = KERN_CADPID,
501 .procname = "cad_pid",
502 .data = &cad_pid,
503 .maxlen = sizeof (int),
504 .mode = 0600,
505 .proc_handler = &proc_dointvec,
506 },
507 {
508 .ctl_name = KERN_MAX_THREADS,
509 .procname = "threads-max",
510 .data = &max_threads,
511 .maxlen = sizeof(int),
512 .mode = 0644,
513 .proc_handler = &proc_dointvec,
514 },
515 {
516 .ctl_name = KERN_RANDOM,
517 .procname = "random",
518 .mode = 0555,
519 .child = random_table,
520 },
521 #ifdef CONFIG_UNIX98_PTYS
522 {
523 .ctl_name = KERN_PTY,
524 .procname = "pty",
525 .mode = 0555,
526 .child = pty_table,
527 },
528 #endif
529 {
530 .ctl_name = KERN_OVERFLOWUID,
531 .procname = "overflowuid",
532 .data = &overflowuid,
533 .maxlen = sizeof(int),
534 .mode = 0644,
535 .proc_handler = &proc_dointvec_minmax,
536 .strategy = &sysctl_intvec,
537 .extra1 = &minolduid,
538 .extra2 = &maxolduid,
539 },
540 {
541 .ctl_name = KERN_OVERFLOWGID,
542 .procname = "overflowgid",
543 .data = &overflowgid,
544 .maxlen = sizeof(int),
545 .mode = 0644,
546 .proc_handler = &proc_dointvec_minmax,
547 .strategy = &sysctl_intvec,
548 .extra1 = &minolduid,
549 .extra2 = &maxolduid,
550 },
551 #ifdef CONFIG_S390
552 #ifdef CONFIG_MATHEMU
553 {
554 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
555 .procname = "ieee_emulation_warnings",
556 .data = &sysctl_ieee_emulation_warnings,
557 .maxlen = sizeof(int),
558 .mode = 0644,
559 .proc_handler = &proc_dointvec,
560 },
561 #endif
562 #ifdef CONFIG_NO_IDLE_HZ
563 {
564 .ctl_name = KERN_HZ_TIMER,
565 .procname = "hz_timer",
566 .data = &sysctl_hz_timer,
567 .maxlen = sizeof(int),
568 .mode = 0644,
569 .proc_handler = &proc_dointvec,
570 },
571 #endif
572 {
573 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
574 .procname = "userprocess_debug",
575 .data = &sysctl_userprocess_debug,
576 .maxlen = sizeof(int),
577 .mode = 0644,
578 .proc_handler = &proc_dointvec,
579 },
580 #endif
581 {
582 .ctl_name = KERN_PIDMAX,
583 .procname = "pid_max",
584 .data = &pid_max,
585 .maxlen = sizeof (int),
586 .mode = 0644,
587 .proc_handler = &proc_dointvec_minmax,
588 .strategy = sysctl_intvec,
589 .extra1 = &pid_max_min,
590 .extra2 = &pid_max_max,
591 },
592 {
593 .ctl_name = KERN_PANIC_ON_OOPS,
594 .procname = "panic_on_oops",
595 .data = &panic_on_oops,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = &proc_dointvec,
599 },
600 {
601 .ctl_name = KERN_PRINTK_RATELIMIT,
602 .procname = "printk_ratelimit",
603 .data = &printk_ratelimit_jiffies,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = &proc_dointvec_jiffies,
607 .strategy = &sysctl_jiffies,
608 },
609 {
610 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
611 .procname = "printk_ratelimit_burst",
612 .data = &printk_ratelimit_burst,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = &proc_dointvec,
616 },
617 {
618 .ctl_name = KERN_NGROUPS_MAX,
619 .procname = "ngroups_max",
620 .data = &ngroups_max,
621 .maxlen = sizeof (int),
622 .mode = 0444,
623 .proc_handler = &proc_dointvec,
624 },
625 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
626 {
627 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
628 .procname = "unknown_nmi_panic",
629 .data = &unknown_nmi_panic,
630 .maxlen = sizeof (int),
631 .mode = 0644,
632 .proc_handler = &proc_unknown_nmi_panic,
633 },
634 #endif
635 #if defined(CONFIG_X86)
636 {
637 .ctl_name = KERN_BOOTLOADER_TYPE,
638 .procname = "bootloader_type",
639 .data = &bootloader_type,
640 .maxlen = sizeof (int),
641 .mode = 0444,
642 .proc_handler = &proc_dointvec,
643 },
644 #endif
645 #if defined(CONFIG_MMU)
646 {
647 .ctl_name = KERN_RANDOMIZE,
648 .procname = "randomize_va_space",
649 .data = &randomize_va_space,
650 .maxlen = sizeof(int),
651 .mode = 0644,
652 .proc_handler = &proc_dointvec,
653 },
654 #endif
655 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
656 {
657 .ctl_name = KERN_SPIN_RETRY,
658 .procname = "spin_retry",
659 .data = &spin_retry,
660 .maxlen = sizeof (int),
661 .mode = 0644,
662 .proc_handler = &proc_dointvec,
663 },
664 #endif
665 #ifdef CONFIG_ACPI_SLEEP
666 {
667 .ctl_name = KERN_ACPI_VIDEO_FLAGS,
668 .procname = "acpi_video_flags",
669 .data = &acpi_video_flags,
670 .maxlen = sizeof (unsigned long),
671 .mode = 0644,
672 .proc_handler = &proc_doulongvec_minmax,
673 },
674 #endif
675 #ifdef CONFIG_IA64
676 {
677 .ctl_name = KERN_IA64_UNALIGNED,
678 .procname = "ignore-unaligned-usertrap",
679 .data = &no_unaligned_warning,
680 .maxlen = sizeof (int),
681 .mode = 0644,
682 .proc_handler = &proc_dointvec,
683 },
684 #endif
685 #ifdef CONFIG_COMPAT
686 {
687 .ctl_name = KERN_COMPAT_LOG,
688 .procname = "compat-log",
689 .data = &compat_log,
690 .maxlen = sizeof (int),
691 .mode = 0644,
692 .proc_handler = &proc_dointvec,
693 },
694 #endif
695 #ifdef CONFIG_RT_MUTEXES
696 {
697 .ctl_name = KERN_MAX_LOCK_DEPTH,
698 .procname = "max_lock_depth",
699 .data = &max_lock_depth,
700 .maxlen = sizeof(int),
701 .mode = 0644,
702 .proc_handler = &proc_dointvec,
703 },
704 #endif
705
706 { .ctl_name = 0 }
707 };
708
709 /* Constants for minimum and maximum testing in vm_table.
710 We use these as one-element integer vectors. */
711 static int zero;
712 static int one_hundred = 100;
713
714
715 static ctl_table vm_table[] = {
716 {
717 .ctl_name = VM_OVERCOMMIT_MEMORY,
718 .procname = "overcommit_memory",
719 .data = &sysctl_overcommit_memory,
720 .maxlen = sizeof(sysctl_overcommit_memory),
721 .mode = 0644,
722 .proc_handler = &proc_dointvec,
723 },
724 {
725 .ctl_name = VM_PANIC_ON_OOM,
726 .procname = "panic_on_oom",
727 .data = &sysctl_panic_on_oom,
728 .maxlen = sizeof(sysctl_panic_on_oom),
729 .mode = 0644,
730 .proc_handler = &proc_dointvec,
731 },
732 {
733 .ctl_name = VM_OVERCOMMIT_RATIO,
734 .procname = "overcommit_ratio",
735 .data = &sysctl_overcommit_ratio,
736 .maxlen = sizeof(sysctl_overcommit_ratio),
737 .mode = 0644,
738 .proc_handler = &proc_dointvec,
739 },
740 {
741 .ctl_name = VM_PAGE_CLUSTER,
742 .procname = "page-cluster",
743 .data = &page_cluster,
744 .maxlen = sizeof(int),
745 .mode = 0644,
746 .proc_handler = &proc_dointvec,
747 },
748 {
749 .ctl_name = VM_DIRTY_BACKGROUND,
750 .procname = "dirty_background_ratio",
751 .data = &dirty_background_ratio,
752 .maxlen = sizeof(dirty_background_ratio),
753 .mode = 0644,
754 .proc_handler = &proc_dointvec_minmax,
755 .strategy = &sysctl_intvec,
756 .extra1 = &zero,
757 .extra2 = &one_hundred,
758 },
759 {
760 .ctl_name = VM_DIRTY_RATIO,
761 .procname = "dirty_ratio",
762 .data = &vm_dirty_ratio,
763 .maxlen = sizeof(vm_dirty_ratio),
764 .mode = 0644,
765 .proc_handler = &proc_dointvec_minmax,
766 .strategy = &sysctl_intvec,
767 .extra1 = &zero,
768 .extra2 = &one_hundred,
769 },
770 {
771 .ctl_name = VM_DIRTY_WB_CS,
772 .procname = "dirty_writeback_centisecs",
773 .data = &dirty_writeback_interval,
774 .maxlen = sizeof(dirty_writeback_interval),
775 .mode = 0644,
776 .proc_handler = &dirty_writeback_centisecs_handler,
777 },
778 {
779 .ctl_name = VM_DIRTY_EXPIRE_CS,
780 .procname = "dirty_expire_centisecs",
781 .data = &dirty_expire_interval,
782 .maxlen = sizeof(dirty_expire_interval),
783 .mode = 0644,
784 .proc_handler = &proc_dointvec_userhz_jiffies,
785 },
786 {
787 .ctl_name = VM_NR_PDFLUSH_THREADS,
788 .procname = "nr_pdflush_threads",
789 .data = &nr_pdflush_threads,
790 .maxlen = sizeof nr_pdflush_threads,
791 .mode = 0444 /* read-only*/,
792 .proc_handler = &proc_dointvec,
793 },
794 {
795 .ctl_name = VM_SWAPPINESS,
796 .procname = "swappiness",
797 .data = &vm_swappiness,
798 .maxlen = sizeof(vm_swappiness),
799 .mode = 0644,
800 .proc_handler = &proc_dointvec_minmax,
801 .strategy = &sysctl_intvec,
802 .extra1 = &zero,
803 .extra2 = &one_hundred,
804 },
805 #ifdef CONFIG_HUGETLB_PAGE
806 {
807 .ctl_name = VM_HUGETLB_PAGES,
808 .procname = "nr_hugepages",
809 .data = &max_huge_pages,
810 .maxlen = sizeof(unsigned long),
811 .mode = 0644,
812 .proc_handler = &hugetlb_sysctl_handler,
813 .extra1 = (void *)&hugetlb_zero,
814 .extra2 = (void *)&hugetlb_infinity,
815 },
816 {
817 .ctl_name = VM_HUGETLB_GROUP,
818 .procname = "hugetlb_shm_group",
819 .data = &sysctl_hugetlb_shm_group,
820 .maxlen = sizeof(gid_t),
821 .mode = 0644,
822 .proc_handler = &proc_dointvec,
823 },
824 #endif
825 {
826 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
827 .procname = "lowmem_reserve_ratio",
828 .data = &sysctl_lowmem_reserve_ratio,
829 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
830 .mode = 0644,
831 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
832 .strategy = &sysctl_intvec,
833 },
834 {
835 .ctl_name = VM_DROP_PAGECACHE,
836 .procname = "drop_caches",
837 .data = &sysctl_drop_caches,
838 .maxlen = sizeof(int),
839 .mode = 0644,
840 .proc_handler = drop_caches_sysctl_handler,
841 .strategy = &sysctl_intvec,
842 },
843 {
844 .ctl_name = VM_MIN_FREE_KBYTES,
845 .procname = "min_free_kbytes",
846 .data = &min_free_kbytes,
847 .maxlen = sizeof(min_free_kbytes),
848 .mode = 0644,
849 .proc_handler = &min_free_kbytes_sysctl_handler,
850 .strategy = &sysctl_intvec,
851 .extra1 = &zero,
852 },
853 {
854 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
855 .procname = "percpu_pagelist_fraction",
856 .data = &percpu_pagelist_fraction,
857 .maxlen = sizeof(percpu_pagelist_fraction),
858 .mode = 0644,
859 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
860 .strategy = &sysctl_intvec,
861 .extra1 = &min_percpu_pagelist_fract,
862 },
863 #ifdef CONFIG_MMU
864 {
865 .ctl_name = VM_MAX_MAP_COUNT,
866 .procname = "max_map_count",
867 .data = &sysctl_max_map_count,
868 .maxlen = sizeof(sysctl_max_map_count),
869 .mode = 0644,
870 .proc_handler = &proc_dointvec
871 },
872 #endif
873 {
874 .ctl_name = VM_LAPTOP_MODE,
875 .procname = "laptop_mode",
876 .data = &laptop_mode,
877 .maxlen = sizeof(laptop_mode),
878 .mode = 0644,
879 .proc_handler = &proc_dointvec_jiffies,
880 .strategy = &sysctl_jiffies,
881 },
882 {
883 .ctl_name = VM_BLOCK_DUMP,
884 .procname = "block_dump",
885 .data = &block_dump,
886 .maxlen = sizeof(block_dump),
887 .mode = 0644,
888 .proc_handler = &proc_dointvec,
889 .strategy = &sysctl_intvec,
890 .extra1 = &zero,
891 },
892 {
893 .ctl_name = VM_VFS_CACHE_PRESSURE,
894 .procname = "vfs_cache_pressure",
895 .data = &sysctl_vfs_cache_pressure,
896 .maxlen = sizeof(sysctl_vfs_cache_pressure),
897 .mode = 0644,
898 .proc_handler = &proc_dointvec,
899 .strategy = &sysctl_intvec,
900 .extra1 = &zero,
901 },
902 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
903 {
904 .ctl_name = VM_LEGACY_VA_LAYOUT,
905 .procname = "legacy_va_layout",
906 .data = &sysctl_legacy_va_layout,
907 .maxlen = sizeof(sysctl_legacy_va_layout),
908 .mode = 0644,
909 .proc_handler = &proc_dointvec,
910 .strategy = &sysctl_intvec,
911 .extra1 = &zero,
912 },
913 #endif
914 #ifdef CONFIG_SWAP
915 {
916 .ctl_name = VM_SWAP_TOKEN_TIMEOUT,
917 .procname = "swap_token_timeout",
918 .data = &swap_token_default_timeout,
919 .maxlen = sizeof(swap_token_default_timeout),
920 .mode = 0644,
921 .proc_handler = &proc_dointvec_jiffies,
922 .strategy = &sysctl_jiffies,
923 },
924 #endif
925 #ifdef CONFIG_NUMA
926 {
927 .ctl_name = VM_ZONE_RECLAIM_MODE,
928 .procname = "zone_reclaim_mode",
929 .data = &zone_reclaim_mode,
930 .maxlen = sizeof(zone_reclaim_mode),
931 .mode = 0644,
932 .proc_handler = &proc_dointvec,
933 .strategy = &sysctl_intvec,
934 .extra1 = &zero,
935 },
936 #endif
937 #ifdef CONFIG_X86_32
938 {
939 .ctl_name = VM_VDSO_ENABLED,
940 .procname = "vdso_enabled",
941 .data = &vdso_enabled,
942 .maxlen = sizeof(vdso_enabled),
943 .mode = 0644,
944 .proc_handler = &proc_dointvec,
945 .strategy = &sysctl_intvec,
946 .extra1 = &zero,
947 },
948 #endif
949 { .ctl_name = 0 }
950 };
951
952 static ctl_table fs_table[] = {
953 {
954 .ctl_name = FS_NRINODE,
955 .procname = "inode-nr",
956 .data = &inodes_stat,
957 .maxlen = 2*sizeof(int),
958 .mode = 0444,
959 .proc_handler = &proc_dointvec,
960 },
961 {
962 .ctl_name = FS_STATINODE,
963 .procname = "inode-state",
964 .data = &inodes_stat,
965 .maxlen = 7*sizeof(int),
966 .mode = 0444,
967 .proc_handler = &proc_dointvec,
968 },
969 {
970 .ctl_name = FS_NRFILE,
971 .procname = "file-nr",
972 .data = &files_stat,
973 .maxlen = 3*sizeof(int),
974 .mode = 0444,
975 .proc_handler = &proc_nr_files,
976 },
977 {
978 .ctl_name = FS_MAXFILE,
979 .procname = "file-max",
980 .data = &files_stat.max_files,
981 .maxlen = sizeof(int),
982 .mode = 0644,
983 .proc_handler = &proc_dointvec,
984 },
985 {
986 .ctl_name = FS_DENTRY,
987 .procname = "dentry-state",
988 .data = &dentry_stat,
989 .maxlen = 6*sizeof(int),
990 .mode = 0444,
991 .proc_handler = &proc_dointvec,
992 },
993 {
994 .ctl_name = FS_OVERFLOWUID,
995 .procname = "overflowuid",
996 .data = &fs_overflowuid,
997 .maxlen = sizeof(int),
998 .mode = 0644,
999 .proc_handler = &proc_dointvec_minmax,
1000 .strategy = &sysctl_intvec,
1001 .extra1 = &minolduid,
1002 .extra2 = &maxolduid,
1003 },
1004 {
1005 .ctl_name = FS_OVERFLOWGID,
1006 .procname = "overflowgid",
1007 .data = &fs_overflowgid,
1008 .maxlen = sizeof(int),
1009 .mode = 0644,
1010 .proc_handler = &proc_dointvec_minmax,
1011 .strategy = &sysctl_intvec,
1012 .extra1 = &minolduid,
1013 .extra2 = &maxolduid,
1014 },
1015 {
1016 .ctl_name = FS_LEASES,
1017 .procname = "leases-enable",
1018 .data = &leases_enable,
1019 .maxlen = sizeof(int),
1020 .mode = 0644,
1021 .proc_handler = &proc_dointvec,
1022 },
1023 #ifdef CONFIG_DNOTIFY
1024 {
1025 .ctl_name = FS_DIR_NOTIFY,
1026 .procname = "dir-notify-enable",
1027 .data = &dir_notify_enable,
1028 .maxlen = sizeof(int),
1029 .mode = 0644,
1030 .proc_handler = &proc_dointvec,
1031 },
1032 #endif
1033 #ifdef CONFIG_MMU
1034 {
1035 .ctl_name = FS_LEASE_TIME,
1036 .procname = "lease-break-time",
1037 .data = &lease_break_time,
1038 .maxlen = sizeof(int),
1039 .mode = 0644,
1040 .proc_handler = &proc_dointvec,
1041 },
1042 {
1043 .ctl_name = FS_AIO_NR,
1044 .procname = "aio-nr",
1045 .data = &aio_nr,
1046 .maxlen = sizeof(aio_nr),
1047 .mode = 0444,
1048 .proc_handler = &proc_doulongvec_minmax,
1049 },
1050 {
1051 .ctl_name = FS_AIO_MAX_NR,
1052 .procname = "aio-max-nr",
1053 .data = &aio_max_nr,
1054 .maxlen = sizeof(aio_max_nr),
1055 .mode = 0644,
1056 .proc_handler = &proc_doulongvec_minmax,
1057 },
1058 #ifdef CONFIG_INOTIFY_USER
1059 {
1060 .ctl_name = FS_INOTIFY,
1061 .procname = "inotify",
1062 .mode = 0555,
1063 .child = inotify_table,
1064 },
1065 #endif
1066 #endif
1067 {
1068 .ctl_name = KERN_SETUID_DUMPABLE,
1069 .procname = "suid_dumpable",
1070 .data = &suid_dumpable,
1071 .maxlen = sizeof(int),
1072 .mode = 0644,
1073 .proc_handler = &proc_dointvec,
1074 },
1075 { .ctl_name = 0 }
1076 };
1077
1078 static ctl_table debug_table[] = {
1079 { .ctl_name = 0 }
1080 };
1081
1082 static ctl_table dev_table[] = {
1083 { .ctl_name = 0 }
1084 };
1085
1086 extern void init_irq_proc (void);
1087
1088 static DEFINE_SPINLOCK(sysctl_lock);
1089
1090 /* called under sysctl_lock */
1091 static int use_table(struct ctl_table_header *p)
1092 {
1093 if (unlikely(p->unregistering))
1094 return 0;
1095 p->used++;
1096 return 1;
1097 }
1098
1099 /* called under sysctl_lock */
1100 static void unuse_table(struct ctl_table_header *p)
1101 {
1102 if (!--p->used)
1103 if (unlikely(p->unregistering))
1104 complete(p->unregistering);
1105 }
1106
1107 /* called under sysctl_lock, will reacquire if has to wait */
1108 static void start_unregistering(struct ctl_table_header *p)
1109 {
1110 /*
1111 * if p->used is 0, nobody will ever touch that entry again;
1112 * we'll eliminate all paths to it before dropping sysctl_lock
1113 */
1114 if (unlikely(p->used)) {
1115 struct completion wait;
1116 init_completion(&wait);
1117 p->unregistering = &wait;
1118 spin_unlock(&sysctl_lock);
1119 wait_for_completion(&wait);
1120 spin_lock(&sysctl_lock);
1121 }
1122 /*
1123 * do not remove from the list until nobody holds it; walking the
1124 * list in do_sysctl() relies on that.
1125 */
1126 list_del_init(&p->ctl_entry);
1127 }
1128
1129 void __init sysctl_init(void)
1130 {
1131 #ifdef CONFIG_PROC_FS
1132 register_proc_table(root_table, proc_sys_root, &root_table_header);
1133 init_irq_proc();
1134 #endif
1135 }
1136
1137 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1138 void __user *newval, size_t newlen)
1139 {
1140 struct list_head *tmp;
1141 int error = -ENOTDIR;
1142
1143 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1144 return -ENOTDIR;
1145 if (oldval) {
1146 int old_len;
1147 if (!oldlenp || get_user(old_len, oldlenp))
1148 return -EFAULT;
1149 }
1150 spin_lock(&sysctl_lock);
1151 tmp = &root_table_header.ctl_entry;
1152 do {
1153 struct ctl_table_header *head =
1154 list_entry(tmp, struct ctl_table_header, ctl_entry);
1155 void *context = NULL;
1156
1157 if (!use_table(head))
1158 continue;
1159
1160 spin_unlock(&sysctl_lock);
1161
1162 error = parse_table(name, nlen, oldval, oldlenp,
1163 newval, newlen, head->ctl_table,
1164 &context);
1165 kfree(context);
1166
1167 spin_lock(&sysctl_lock);
1168 unuse_table(head);
1169 if (error != -ENOTDIR)
1170 break;
1171 } while ((tmp = tmp->next) != &root_table_header.ctl_entry);
1172 spin_unlock(&sysctl_lock);
1173 return error;
1174 }
1175
1176 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1177 {
1178 struct __sysctl_args tmp;
1179 int error;
1180
1181 if (copy_from_user(&tmp, args, sizeof(tmp)))
1182 return -EFAULT;
1183
1184 lock_kernel();
1185 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1186 tmp.newval, tmp.newlen);
1187 unlock_kernel();
1188 return error;
1189 }
1190
1191 /*
1192 * ctl_perm does NOT grant the superuser all rights automatically, because
1193 * some sysctl variables are readonly even to root.
1194 */
1195
1196 static int test_perm(int mode, int op)
1197 {
1198 if (!current->euid)
1199 mode >>= 6;
1200 else if (in_egroup_p(0))
1201 mode >>= 3;
1202 if ((mode & op & 0007) == op)
1203 return 0;
1204 return -EACCES;
1205 }
1206
1207 static inline int ctl_perm(ctl_table *table, int op)
1208 {
1209 int error;
1210 error = security_sysctl(table, op);
1211 if (error)
1212 return error;
1213 return test_perm(table->mode, op);
1214 }
1215
1216 static int parse_table(int __user *name, int nlen,
1217 void __user *oldval, size_t __user *oldlenp,
1218 void __user *newval, size_t newlen,
1219 ctl_table *table, void **context)
1220 {
1221 int n;
1222 repeat:
1223 if (!nlen)
1224 return -ENOTDIR;
1225 if (get_user(n, name))
1226 return -EFAULT;
1227 for ( ; table->ctl_name; table++) {
1228 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1229 int error;
1230 if (table->child) {
1231 if (ctl_perm(table, 001))
1232 return -EPERM;
1233 if (table->strategy) {
1234 error = table->strategy(
1235 table, name, nlen,
1236 oldval, oldlenp,
1237 newval, newlen, context);
1238 if (error)
1239 return error;
1240 }
1241 name++;
1242 nlen--;
1243 table = table->child;
1244 goto repeat;
1245 }
1246 error = do_sysctl_strategy(table, name, nlen,
1247 oldval, oldlenp,
1248 newval, newlen, context);
1249 return error;
1250 }
1251 }
1252 return -ENOTDIR;
1253 }
1254
1255 /* Perform the actual read/write of a sysctl table entry. */
1256 int do_sysctl_strategy (ctl_table *table,
1257 int __user *name, int nlen,
1258 void __user *oldval, size_t __user *oldlenp,
1259 void __user *newval, size_t newlen, void **context)
1260 {
1261 int op = 0, rc;
1262 size_t len;
1263
1264 if (oldval)
1265 op |= 004;
1266 if (newval)
1267 op |= 002;
1268 if (ctl_perm(table, op))
1269 return -EPERM;
1270
1271 if (table->strategy) {
1272 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1273 newval, newlen, context);
1274 if (rc < 0)
1275 return rc;
1276 if (rc > 0)
1277 return 0;
1278 }
1279
1280 /* If there is no strategy routine, or if the strategy returns
1281 * zero, proceed with automatic r/w */
1282 if (table->data && table->maxlen) {
1283 if (oldval && oldlenp) {
1284 if (get_user(len, oldlenp))
1285 return -EFAULT;
1286 if (len) {
1287 if (len > table->maxlen)
1288 len = table->maxlen;
1289 if(copy_to_user(oldval, table->data, len))
1290 return -EFAULT;
1291 if(put_user(len, oldlenp))
1292 return -EFAULT;
1293 }
1294 }
1295 if (newval && newlen) {
1296 len = newlen;
1297 if (len > table->maxlen)
1298 len = table->maxlen;
1299 if(copy_from_user(table->data, newval, len))
1300 return -EFAULT;
1301 }
1302 }
1303 return 0;
1304 }
1305
1306 /**
1307 * register_sysctl_table - register a sysctl hierarchy
1308 * @table: the top-level table structure
1309 * @insert_at_head: whether the entry should be inserted in front or at the end
1310 *
1311 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1312 * array. An entry with a ctl_name of 0 terminates the table.
1313 *
1314 * The members of the &ctl_table structure are used as follows:
1315 *
1316 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1317 * must be unique within that level of sysctl
1318 *
1319 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1320 * enter a sysctl file
1321 *
1322 * data - a pointer to data for use by proc_handler
1323 *
1324 * maxlen - the maximum size in bytes of the data
1325 *
1326 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1327 *
1328 * child - a pointer to the child sysctl table if this entry is a directory, or
1329 * %NULL.
1330 *
1331 * proc_handler - the text handler routine (described below)
1332 *
1333 * strategy - the strategy routine (described below)
1334 *
1335 * de - for internal use by the sysctl routines
1336 *
1337 * extra1, extra2 - extra pointers usable by the proc handler routines
1338 *
1339 * Leaf nodes in the sysctl tree will be represented by a single file
1340 * under /proc; non-leaf nodes will be represented by directories.
1341 *
1342 * sysctl(2) can automatically manage read and write requests through
1343 * the sysctl table. The data and maxlen fields of the ctl_table
1344 * struct enable minimal validation of the values being written to be
1345 * performed, and the mode field allows minimal authentication.
1346 *
1347 * More sophisticated management can be enabled by the provision of a
1348 * strategy routine with the table entry. This will be called before
1349 * any automatic read or write of the data is performed.
1350 *
1351 * The strategy routine may return
1352 *
1353 * < 0 - Error occurred (error is passed to user process)
1354 *
1355 * 0 - OK - proceed with automatic read or write.
1356 *
1357 * > 0 - OK - read or write has been done by the strategy routine, so
1358 * return immediately.
1359 *
1360 * There must be a proc_handler routine for any terminal nodes
1361 * mirrored under /proc/sys (non-terminals are handled by a built-in
1362 * directory handler). Several default handlers are available to
1363 * cover common cases -
1364 *
1365 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1366 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1367 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1368 *
1369 * It is the handler's job to read the input buffer from user memory
1370 * and process it. The handler should return 0 on success.
1371 *
1372 * This routine returns %NULL on a failure to register, and a pointer
1373 * to the table header on success.
1374 */
1375 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1376 int insert_at_head)
1377 {
1378 struct ctl_table_header *tmp;
1379 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1380 if (!tmp)
1381 return NULL;
1382 tmp->ctl_table = table;
1383 INIT_LIST_HEAD(&tmp->ctl_entry);
1384 tmp->used = 0;
1385 tmp->unregistering = NULL;
1386 spin_lock(&sysctl_lock);
1387 if (insert_at_head)
1388 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1389 else
1390 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1391 spin_unlock(&sysctl_lock);
1392 #ifdef CONFIG_PROC_FS
1393 register_proc_table(table, proc_sys_root, tmp);
1394 #endif
1395 return tmp;
1396 }
1397
1398 /**
1399 * unregister_sysctl_table - unregister a sysctl table hierarchy
1400 * @header: the header returned from register_sysctl_table
1401 *
1402 * Unregisters the sysctl table and all children. proc entries may not
1403 * actually be removed until they are no longer used by anyone.
1404 */
1405 void unregister_sysctl_table(struct ctl_table_header * header)
1406 {
1407 might_sleep();
1408 spin_lock(&sysctl_lock);
1409 start_unregistering(header);
1410 #ifdef CONFIG_PROC_FS
1411 unregister_proc_table(header->ctl_table, proc_sys_root);
1412 #endif
1413 spin_unlock(&sysctl_lock);
1414 kfree(header);
1415 }
1416
1417 /*
1418 * /proc/sys support
1419 */
1420
1421 #ifdef CONFIG_PROC_FS
1422
1423 /* Scan the sysctl entries in table and add them all into /proc */
1424 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set)
1425 {
1426 struct proc_dir_entry *de;
1427 int len;
1428 mode_t mode;
1429
1430 for (; table->ctl_name; table++) {
1431 /* Can't do anything without a proc name. */
1432 if (!table->procname)
1433 continue;
1434 /* Maybe we can't do anything with it... */
1435 if (!table->proc_handler && !table->child) {
1436 printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1437 table->procname);
1438 continue;
1439 }
1440
1441 len = strlen(table->procname);
1442 mode = table->mode;
1443
1444 de = NULL;
1445 if (table->proc_handler)
1446 mode |= S_IFREG;
1447 else {
1448 mode |= S_IFDIR;
1449 for (de = root->subdir; de; de = de->next) {
1450 if (proc_match(len, table->procname, de))
1451 break;
1452 }
1453 /* If the subdir exists already, de is non-NULL */
1454 }
1455
1456 if (!de) {
1457 de = create_proc_entry(table->procname, mode, root);
1458 if (!de)
1459 continue;
1460 de->set = set;
1461 de->data = (void *) table;
1462 if (table->proc_handler)
1463 de->proc_fops = &proc_sys_file_operations;
1464 }
1465 table->de = de;
1466 if (de->mode & S_IFDIR)
1467 register_proc_table(table->child, de, set);
1468 }
1469 }
1470
1471 /*
1472 * Unregister a /proc sysctl table and any subdirectories.
1473 */
1474 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1475 {
1476 struct proc_dir_entry *de;
1477 for (; table->ctl_name; table++) {
1478 if (!(de = table->de))
1479 continue;
1480 if (de->mode & S_IFDIR) {
1481 if (!table->child) {
1482 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1483 continue;
1484 }
1485 unregister_proc_table(table->child, de);
1486
1487 /* Don't unregister directories which still have entries.. */
1488 if (de->subdir)
1489 continue;
1490 }
1491
1492 /*
1493 * In any case, mark the entry as goner; we'll keep it
1494 * around if it's busy, but we'll know to do nothing with
1495 * its fields. We are under sysctl_lock here.
1496 */
1497 de->data = NULL;
1498
1499 /* Don't unregister proc entries that are still being used.. */
1500 if (atomic_read(&de->count))
1501 continue;
1502
1503 table->de = NULL;
1504 remove_proc_entry(table->procname, root);
1505 }
1506 }
1507
1508 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1509 size_t count, loff_t *ppos)
1510 {
1511 int op;
1512 struct proc_dir_entry *de = PDE(file->f_dentry->d_inode);
1513 struct ctl_table *table;
1514 size_t res;
1515 ssize_t error = -ENOTDIR;
1516
1517 spin_lock(&sysctl_lock);
1518 if (de && de->data && use_table(de->set)) {
1519 /*
1520 * at that point we know that sysctl was not unregistered
1521 * and won't be until we finish
1522 */
1523 spin_unlock(&sysctl_lock);
1524 table = (struct ctl_table *) de->data;
1525 if (!table || !table->proc_handler)
1526 goto out;
1527 error = -EPERM;
1528 op = (write ? 002 : 004);
1529 if (ctl_perm(table, op))
1530 goto out;
1531
1532 /* careful: calling conventions are nasty here */
1533 res = count;
1534 error = (*table->proc_handler)(table, write, file,
1535 buf, &res, ppos);
1536 if (!error)
1537 error = res;
1538 out:
1539 spin_lock(&sysctl_lock);
1540 unuse_table(de->set);
1541 }
1542 spin_unlock(&sysctl_lock);
1543 return error;
1544 }
1545
1546 static int proc_opensys(struct inode *inode, struct file *file)
1547 {
1548 if (file->f_mode & FMODE_WRITE) {
1549 /*
1550 * sysctl entries that are not writable,
1551 * are _NOT_ writable, capabilities or not.
1552 */
1553 if (!(inode->i_mode & S_IWUSR))
1554 return -EPERM;
1555 }
1556
1557 return 0;
1558 }
1559
1560 static ssize_t proc_readsys(struct file * file, char __user * buf,
1561 size_t count, loff_t *ppos)
1562 {
1563 return do_rw_proc(0, file, buf, count, ppos);
1564 }
1565
1566 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1567 size_t count, loff_t *ppos)
1568 {
1569 return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1570 }
1571
1572 /**
1573 * proc_dostring - read a string sysctl
1574 * @table: the sysctl table
1575 * @write: %TRUE if this is a write to the sysctl file
1576 * @filp: the file structure
1577 * @buffer: the user buffer
1578 * @lenp: the size of the user buffer
1579 * @ppos: file position
1580 *
1581 * Reads/writes a string from/to the user buffer. If the kernel
1582 * buffer provided is not large enough to hold the string, the
1583 * string is truncated. The copied string is %NULL-terminated.
1584 * If the string is being read by the user process, it is copied
1585 * and a newline '\n' is added. It is truncated if the buffer is
1586 * not large enough.
1587 *
1588 * Returns 0 on success.
1589 */
1590 int proc_dostring(ctl_table *table, int write, struct file *filp,
1591 void __user *buffer, size_t *lenp, loff_t *ppos)
1592 {
1593 size_t len;
1594 char __user *p;
1595 char c;
1596
1597 if (!table->data || !table->maxlen || !*lenp ||
1598 (*ppos && !write)) {
1599 *lenp = 0;
1600 return 0;
1601 }
1602
1603 if (write) {
1604 len = 0;
1605 p = buffer;
1606 while (len < *lenp) {
1607 if (get_user(c, p++))
1608 return -EFAULT;
1609 if (c == 0 || c == '\n')
1610 break;
1611 len++;
1612 }
1613 if (len >= table->maxlen)
1614 len = table->maxlen-1;
1615 if(copy_from_user(table->data, buffer, len))
1616 return -EFAULT;
1617 ((char *) table->data)[len] = 0;
1618 *ppos += *lenp;
1619 } else {
1620 len = strlen(table->data);
1621 if (len > table->maxlen)
1622 len = table->maxlen;
1623 if (len > *lenp)
1624 len = *lenp;
1625 if (len)
1626 if(copy_to_user(buffer, table->data, len))
1627 return -EFAULT;
1628 if (len < *lenp) {
1629 if(put_user('\n', ((char __user *) buffer) + len))
1630 return -EFAULT;
1631 len++;
1632 }
1633 *lenp = len;
1634 *ppos += len;
1635 }
1636 return 0;
1637 }
1638
1639 /*
1640 * Special case of dostring for the UTS structure. This has locks
1641 * to observe. Should this be in kernel/sys.c ????
1642 */
1643
1644 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1645 void __user *buffer, size_t *lenp, loff_t *ppos)
1646 {
1647 int r;
1648
1649 if (!write) {
1650 down_read(&uts_sem);
1651 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1652 up_read(&uts_sem);
1653 } else {
1654 down_write(&uts_sem);
1655 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1656 up_write(&uts_sem);
1657 }
1658 return r;
1659 }
1660
1661 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1662 int *valp,
1663 int write, void *data)
1664 {
1665 if (write) {
1666 *valp = *negp ? -*lvalp : *lvalp;
1667 } else {
1668 int val = *valp;
1669 if (val < 0) {
1670 *negp = -1;
1671 *lvalp = (unsigned long)-val;
1672 } else {
1673 *negp = 0;
1674 *lvalp = (unsigned long)val;
1675 }
1676 }
1677 return 0;
1678 }
1679
1680 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1681 void __user *buffer, size_t *lenp, loff_t *ppos,
1682 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1683 int write, void *data),
1684 void *data)
1685 {
1686 #define TMPBUFLEN 21
1687 int *i, vleft, first=1, neg, val;
1688 unsigned long lval;
1689 size_t left, len;
1690
1691 char buf[TMPBUFLEN], *p;
1692 char __user *s = buffer;
1693
1694 if (!table->data || !table->maxlen || !*lenp ||
1695 (*ppos && !write)) {
1696 *lenp = 0;
1697 return 0;
1698 }
1699
1700 i = (int *) table->data;
1701 vleft = table->maxlen / sizeof(*i);
1702 left = *lenp;
1703
1704 if (!conv)
1705 conv = do_proc_dointvec_conv;
1706
1707 for (; left && vleft--; i++, first=0) {
1708 if (write) {
1709 while (left) {
1710 char c;
1711 if (get_user(c, s))
1712 return -EFAULT;
1713 if (!isspace(c))
1714 break;
1715 left--;
1716 s++;
1717 }
1718 if (!left)
1719 break;
1720 neg = 0;
1721 len = left;
1722 if (len > sizeof(buf) - 1)
1723 len = sizeof(buf) - 1;
1724 if (copy_from_user(buf, s, len))
1725 return -EFAULT;
1726 buf[len] = 0;
1727 p = buf;
1728 if (*p == '-' && left > 1) {
1729 neg = 1;
1730 left--, p++;
1731 }
1732 if (*p < '0' || *p > '9')
1733 break;
1734
1735 lval = simple_strtoul(p, &p, 0);
1736
1737 len = p-buf;
1738 if ((len < left) && *p && !isspace(*p))
1739 break;
1740 if (neg)
1741 val = -val;
1742 s += len;
1743 left -= len;
1744
1745 if (conv(&neg, &lval, i, 1, data))
1746 break;
1747 } else {
1748 p = buf;
1749 if (!first)
1750 *p++ = '\t';
1751
1752 if (conv(&neg, &lval, i, 0, data))
1753 break;
1754
1755 sprintf(p, "%s%lu", neg ? "-" : "", lval);
1756 len = strlen(buf);
1757 if (len > left)
1758 len = left;
1759 if(copy_to_user(s, buf, len))
1760 return -EFAULT;
1761 left -= len;
1762 s += len;
1763 }
1764 }
1765
1766 if (!write && !first && left) {
1767 if(put_user('\n', s))
1768 return -EFAULT;
1769 left--, s++;
1770 }
1771 if (write) {
1772 while (left) {
1773 char c;
1774 if (get_user(c, s++))
1775 return -EFAULT;
1776 if (!isspace(c))
1777 break;
1778 left--;
1779 }
1780 }
1781 if (write && first)
1782 return -EINVAL;
1783 *lenp -= left;
1784 *ppos += *lenp;
1785 return 0;
1786 #undef TMPBUFLEN
1787 }
1788
1789 /**
1790 * proc_dointvec - read a vector of integers
1791 * @table: the sysctl table
1792 * @write: %TRUE if this is a write to the sysctl file
1793 * @filp: the file structure
1794 * @buffer: the user buffer
1795 * @lenp: the size of the user buffer
1796 * @ppos: file position
1797 *
1798 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1799 * values from/to the user buffer, treated as an ASCII string.
1800 *
1801 * Returns 0 on success.
1802 */
1803 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1804 void __user *buffer, size_t *lenp, loff_t *ppos)
1805 {
1806 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1807 NULL,NULL);
1808 }
1809
1810 #define OP_SET 0
1811 #define OP_AND 1
1812 #define OP_OR 2
1813 #define OP_MAX 3
1814 #define OP_MIN 4
1815
1816 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1817 int *valp,
1818 int write, void *data)
1819 {
1820 int op = *(int *)data;
1821 if (write) {
1822 int val = *negp ? -*lvalp : *lvalp;
1823 switch(op) {
1824 case OP_SET: *valp = val; break;
1825 case OP_AND: *valp &= val; break;
1826 case OP_OR: *valp |= val; break;
1827 case OP_MAX: if(*valp < val)
1828 *valp = val;
1829 break;
1830 case OP_MIN: if(*valp > val)
1831 *valp = val;
1832 break;
1833 }
1834 } else {
1835 int val = *valp;
1836 if (val < 0) {
1837 *negp = -1;
1838 *lvalp = (unsigned long)-val;
1839 } else {
1840 *negp = 0;
1841 *lvalp = (unsigned long)val;
1842 }
1843 }
1844 return 0;
1845 }
1846
1847 /*
1848 * init may raise the set.
1849 */
1850
1851 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1852 void __user *buffer, size_t *lenp, loff_t *ppos)
1853 {
1854 int op;
1855
1856 if (!capable(CAP_SYS_MODULE)) {
1857 return -EPERM;
1858 }
1859
1860 op = (current->pid == 1) ? OP_SET : OP_AND;
1861 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1862 do_proc_dointvec_bset_conv,&op);
1863 }
1864
1865 struct do_proc_dointvec_minmax_conv_param {
1866 int *min;
1867 int *max;
1868 };
1869
1870 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1871 int *valp,
1872 int write, void *data)
1873 {
1874 struct do_proc_dointvec_minmax_conv_param *param = data;
1875 if (write) {
1876 int val = *negp ? -*lvalp : *lvalp;
1877 if ((param->min && *param->min > val) ||
1878 (param->max && *param->max < val))
1879 return -EINVAL;
1880 *valp = val;
1881 } else {
1882 int val = *valp;
1883 if (val < 0) {
1884 *negp = -1;
1885 *lvalp = (unsigned long)-val;
1886 } else {
1887 *negp = 0;
1888 *lvalp = (unsigned long)val;
1889 }
1890 }
1891 return 0;
1892 }
1893
1894 /**
1895 * proc_dointvec_minmax - read a vector of integers with min/max values
1896 * @table: the sysctl table
1897 * @write: %TRUE if this is a write to the sysctl file
1898 * @filp: the file structure
1899 * @buffer: the user buffer
1900 * @lenp: the size of the user buffer
1901 * @ppos: file position
1902 *
1903 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1904 * values from/to the user buffer, treated as an ASCII string.
1905 *
1906 * This routine will ensure the values are within the range specified by
1907 * table->extra1 (min) and table->extra2 (max).
1908 *
1909 * Returns 0 on success.
1910 */
1911 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1912 void __user *buffer, size_t *lenp, loff_t *ppos)
1913 {
1914 struct do_proc_dointvec_minmax_conv_param param = {
1915 .min = (int *) table->extra1,
1916 .max = (int *) table->extra2,
1917 };
1918 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1919 do_proc_dointvec_minmax_conv, &param);
1920 }
1921
1922 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1923 struct file *filp,
1924 void __user *buffer,
1925 size_t *lenp, loff_t *ppos,
1926 unsigned long convmul,
1927 unsigned long convdiv)
1928 {
1929 #define TMPBUFLEN 21
1930 unsigned long *i, *min, *max, val;
1931 int vleft, first=1, neg;
1932 size_t len, left;
1933 char buf[TMPBUFLEN], *p;
1934 char __user *s = buffer;
1935
1936 if (!table->data || !table->maxlen || !*lenp ||
1937 (*ppos && !write)) {
1938 *lenp = 0;
1939 return 0;
1940 }
1941
1942 i = (unsigned long *) table->data;
1943 min = (unsigned long *) table->extra1;
1944 max = (unsigned long *) table->extra2;
1945 vleft = table->maxlen / sizeof(unsigned long);
1946 left = *lenp;
1947
1948 for (; left && vleft--; i++, min++, max++, first=0) {
1949 if (write) {
1950 while (left) {
1951 char c;
1952 if (get_user(c, s))
1953 return -EFAULT;
1954 if (!isspace(c))
1955 break;
1956 left--;
1957 s++;
1958 }
1959 if (!left)
1960 break;
1961 neg = 0;
1962 len = left;
1963 if (len > TMPBUFLEN-1)
1964 len = TMPBUFLEN-1;
1965 if (copy_from_user(buf, s, len))
1966 return -EFAULT;
1967 buf[len] = 0;
1968 p = buf;
1969 if (*p == '-' && left > 1) {
1970 neg = 1;
1971 left--, p++;
1972 }
1973 if (*p < '0' || *p > '9')
1974 break;
1975 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1976 len = p-buf;
1977 if ((len < left) && *p && !isspace(*p))
1978 break;
1979 if (neg)
1980 val = -val;
1981 s += len;
1982 left -= len;
1983
1984 if(neg)
1985 continue;
1986 if ((min && val < *min) || (max && val > *max))
1987 continue;
1988 *i = val;
1989 } else {
1990 p = buf;
1991 if (!first)
1992 *p++ = '\t';
1993 sprintf(p, "%lu", convdiv * (*i) / convmul);
1994 len = strlen(buf);
1995 if (len > left)
1996 len = left;
1997 if(copy_to_user(s, buf, len))
1998 return -EFAULT;
1999 left -= len;
2000 s += len;
2001 }
2002 }
2003
2004 if (!write && !first && left) {
2005 if(put_user('\n', s))
2006 return -EFAULT;
2007 left--, s++;
2008 }
2009 if (write) {
2010 while (left) {
2011 char c;
2012 if (get_user(c, s++))
2013 return -EFAULT;
2014 if (!isspace(c))
2015 break;
2016 left--;
2017 }
2018 }
2019 if (write && first)
2020 return -EINVAL;
2021 *lenp -= left;
2022 *ppos += *lenp;
2023 return 0;
2024 #undef TMPBUFLEN
2025 }
2026
2027 /**
2028 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2029 * @table: the sysctl table
2030 * @write: %TRUE if this is a write to the sysctl file
2031 * @filp: the file structure
2032 * @buffer: the user buffer
2033 * @lenp: the size of the user buffer
2034 * @ppos: file position
2035 *
2036 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2037 * values from/to the user buffer, treated as an ASCII string.
2038 *
2039 * This routine will ensure the values are within the range specified by
2040 * table->extra1 (min) and table->extra2 (max).
2041 *
2042 * Returns 0 on success.
2043 */
2044 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2045 void __user *buffer, size_t *lenp, loff_t *ppos)
2046 {
2047 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2048 }
2049
2050 /**
2051 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2052 * @table: the sysctl table
2053 * @write: %TRUE if this is a write to the sysctl file
2054 * @filp: the file structure
2055 * @buffer: the user buffer
2056 * @lenp: the size of the user buffer
2057 * @ppos: file position
2058 *
2059 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2060 * values from/to the user buffer, treated as an ASCII string. The values
2061 * are treated as milliseconds, and converted to jiffies when they are stored.
2062 *
2063 * This routine will ensure the values are within the range specified by
2064 * table->extra1 (min) and table->extra2 (max).
2065 *
2066 * Returns 0 on success.
2067 */
2068 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2069 struct file *filp,
2070 void __user *buffer,
2071 size_t *lenp, loff_t *ppos)
2072 {
2073 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2074 lenp, ppos, HZ, 1000l);
2075 }
2076
2077
2078 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2079 int *valp,
2080 int write, void *data)
2081 {
2082 if (write) {
2083 if (*lvalp > LONG_MAX / HZ)
2084 return 1;
2085 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2086 } else {
2087 int val = *valp;
2088 unsigned long lval;
2089 if (val < 0) {
2090 *negp = -1;
2091 lval = (unsigned long)-val;
2092 } else {
2093 *negp = 0;
2094 lval = (unsigned long)val;
2095 }
2096 *lvalp = lval / HZ;
2097 }
2098 return 0;
2099 }
2100
2101 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2102 int *valp,
2103 int write, void *data)
2104 {
2105 if (write) {
2106 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2107 return 1;
2108 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2109 } else {
2110 int val = *valp;
2111 unsigned long lval;
2112 if (val < 0) {
2113 *negp = -1;
2114 lval = (unsigned long)-val;
2115 } else {
2116 *negp = 0;
2117 lval = (unsigned long)val;
2118 }
2119 *lvalp = jiffies_to_clock_t(lval);
2120 }
2121 return 0;
2122 }
2123
2124 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2125 int *valp,
2126 int write, void *data)
2127 {
2128 if (write) {
2129 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2130 } else {
2131 int val = *valp;
2132 unsigned long lval;
2133 if (val < 0) {
2134 *negp = -1;
2135 lval = (unsigned long)-val;
2136 } else {
2137 *negp = 0;
2138 lval = (unsigned long)val;
2139 }
2140 *lvalp = jiffies_to_msecs(lval);
2141 }
2142 return 0;
2143 }
2144
2145 /**
2146 * proc_dointvec_jiffies - read a vector of integers as seconds
2147 * @table: the sysctl table
2148 * @write: %TRUE if this is a write to the sysctl file
2149 * @filp: the file structure
2150 * @buffer: the user buffer
2151 * @lenp: the size of the user buffer
2152 * @ppos: file position
2153 *
2154 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2155 * values from/to the user buffer, treated as an ASCII string.
2156 * The values read are assumed to be in seconds, and are converted into
2157 * jiffies.
2158 *
2159 * Returns 0 on success.
2160 */
2161 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2162 void __user *buffer, size_t *lenp, loff_t *ppos)
2163 {
2164 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2165 do_proc_dointvec_jiffies_conv,NULL);
2166 }
2167
2168 /**
2169 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2170 * @table: the sysctl table
2171 * @write: %TRUE if this is a write to the sysctl file
2172 * @filp: the file structure
2173 * @buffer: the user buffer
2174 * @lenp: the size of the user buffer
2175 * @ppos: pointer to the file position
2176 *
2177 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2178 * values from/to the user buffer, treated as an ASCII string.
2179 * The values read are assumed to be in 1/USER_HZ seconds, and
2180 * are converted into jiffies.
2181 *
2182 * Returns 0 on success.
2183 */
2184 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2185 void __user *buffer, size_t *lenp, loff_t *ppos)
2186 {
2187 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2188 do_proc_dointvec_userhz_jiffies_conv,NULL);
2189 }
2190
2191 /**
2192 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2193 * @table: the sysctl table
2194 * @write: %TRUE if this is a write to the sysctl file
2195 * @filp: the file structure
2196 * @buffer: the user buffer
2197 * @lenp: the size of the user buffer
2198 * @ppos: file position
2199 * @ppos: the current position in the file
2200 *
2201 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2202 * values from/to the user buffer, treated as an ASCII string.
2203 * The values read are assumed to be in 1/1000 seconds, and
2204 * are converted into jiffies.
2205 *
2206 * Returns 0 on success.
2207 */
2208 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2209 void __user *buffer, size_t *lenp, loff_t *ppos)
2210 {
2211 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2212 do_proc_dointvec_ms_jiffies_conv, NULL);
2213 }
2214
2215 #else /* CONFIG_PROC_FS */
2216
2217 int proc_dostring(ctl_table *table, int write, struct file *filp,
2218 void __user *buffer, size_t *lenp, loff_t *ppos)
2219 {
2220 return -ENOSYS;
2221 }
2222
2223 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2224 void __user *buffer, size_t *lenp, loff_t *ppos)
2225 {
2226 return -ENOSYS;
2227 }
2228
2229 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2230 void __user *buffer, size_t *lenp, loff_t *ppos)
2231 {
2232 return -ENOSYS;
2233 }
2234
2235 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2236 void __user *buffer, size_t *lenp, loff_t *ppos)
2237 {
2238 return -ENOSYS;
2239 }
2240
2241 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2242 void __user *buffer, size_t *lenp, loff_t *ppos)
2243 {
2244 return -ENOSYS;
2245 }
2246
2247 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2248 void __user *buffer, size_t *lenp, loff_t *ppos)
2249 {
2250 return -ENOSYS;
2251 }
2252
2253 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2254 void __user *buffer, size_t *lenp, loff_t *ppos)
2255 {
2256 return -ENOSYS;
2257 }
2258
2259 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2260 void __user *buffer, size_t *lenp, loff_t *ppos)
2261 {
2262 return -ENOSYS;
2263 }
2264
2265 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2266 void __user *buffer, size_t *lenp, loff_t *ppos)
2267 {
2268 return -ENOSYS;
2269 }
2270
2271 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2272 struct file *filp,
2273 void __user *buffer,
2274 size_t *lenp, loff_t *ppos)
2275 {
2276 return -ENOSYS;
2277 }
2278
2279
2280 #endif /* CONFIG_PROC_FS */
2281
2282
2283 /*
2284 * General sysctl support routines
2285 */
2286
2287 /* The generic string strategy routine: */
2288 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2289 void __user *oldval, size_t __user *oldlenp,
2290 void __user *newval, size_t newlen, void **context)
2291 {
2292 if (!table->data || !table->maxlen)
2293 return -ENOTDIR;
2294
2295 if (oldval && oldlenp) {
2296 size_t bufsize;
2297 if (get_user(bufsize, oldlenp))
2298 return -EFAULT;
2299 if (bufsize) {
2300 size_t len = strlen(table->data), copied;
2301
2302 /* This shouldn't trigger for a well-formed sysctl */
2303 if (len > table->maxlen)
2304 len = table->maxlen;
2305
2306 /* Copy up to a max of bufsize-1 bytes of the string */
2307 copied = (len >= bufsize) ? bufsize - 1 : len;
2308
2309 if (copy_to_user(oldval, table->data, copied) ||
2310 put_user(0, (char __user *)(oldval + copied)))
2311 return -EFAULT;
2312 if (put_user(len, oldlenp))
2313 return -EFAULT;
2314 }
2315 }
2316 if (newval && newlen) {
2317 size_t len = newlen;
2318 if (len > table->maxlen)
2319 len = table->maxlen;
2320 if(copy_from_user(table->data, newval, len))
2321 return -EFAULT;
2322 if (len == table->maxlen)
2323 len--;
2324 ((char *) table->data)[len] = 0;
2325 }
2326 return 1;
2327 }
2328
2329 /*
2330 * This function makes sure that all of the integers in the vector
2331 * are between the minimum and maximum values given in the arrays
2332 * table->extra1 and table->extra2, respectively.
2333 */
2334 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2335 void __user *oldval, size_t __user *oldlenp,
2336 void __user *newval, size_t newlen, void **context)
2337 {
2338
2339 if (newval && newlen) {
2340 int __user *vec = (int __user *) newval;
2341 int *min = (int *) table->extra1;
2342 int *max = (int *) table->extra2;
2343 size_t length;
2344 int i;
2345
2346 if (newlen % sizeof(int) != 0)
2347 return -EINVAL;
2348
2349 if (!table->extra1 && !table->extra2)
2350 return 0;
2351
2352 if (newlen > table->maxlen)
2353 newlen = table->maxlen;
2354 length = newlen / sizeof(int);
2355
2356 for (i = 0; i < length; i++) {
2357 int value;
2358 if (get_user(value, vec + i))
2359 return -EFAULT;
2360 if (min && value < min[i])
2361 return -EINVAL;
2362 if (max && value > max[i])
2363 return -EINVAL;
2364 }
2365 }
2366 return 0;
2367 }
2368
2369 /* Strategy function to convert jiffies to seconds */
2370 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2371 void __user *oldval, size_t __user *oldlenp,
2372 void __user *newval, size_t newlen, void **context)
2373 {
2374 if (oldval) {
2375 size_t olen;
2376 if (oldlenp) {
2377 if (get_user(olen, oldlenp))
2378 return -EFAULT;
2379 if (olen!=sizeof(int))
2380 return -EINVAL;
2381 }
2382 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2383 (oldlenp && put_user(sizeof(int),oldlenp)))
2384 return -EFAULT;
2385 }
2386 if (newval && newlen) {
2387 int new;
2388 if (newlen != sizeof(int))
2389 return -EINVAL;
2390 if (get_user(new, (int __user *)newval))
2391 return -EFAULT;
2392 *(int *)(table->data) = new*HZ;
2393 }
2394 return 1;
2395 }
2396
2397 /* Strategy function to convert jiffies to seconds */
2398 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2399 void __user *oldval, size_t __user *oldlenp,
2400 void __user *newval, size_t newlen, void **context)
2401 {
2402 if (oldval) {
2403 size_t olen;
2404 if (oldlenp) {
2405 if (get_user(olen, oldlenp))
2406 return -EFAULT;
2407 if (olen!=sizeof(int))
2408 return -EINVAL;
2409 }
2410 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2411 (oldlenp && put_user(sizeof(int),oldlenp)))
2412 return -EFAULT;
2413 }
2414 if (newval && newlen) {
2415 int new;
2416 if (newlen != sizeof(int))
2417 return -EINVAL;
2418 if (get_user(new, (int __user *)newval))
2419 return -EFAULT;
2420 *(int *)(table->data) = msecs_to_jiffies(new);
2421 }
2422 return 1;
2423 }
2424
2425 #else /* CONFIG_SYSCTL */
2426
2427
2428 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2429 {
2430 return -ENOSYS;
2431 }
2432
2433 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2434 void __user *oldval, size_t __user *oldlenp,
2435 void __user *newval, size_t newlen, void **context)
2436 {
2437 return -ENOSYS;
2438 }
2439
2440 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2441 void __user *oldval, size_t __user *oldlenp,
2442 void __user *newval, size_t newlen, void **context)
2443 {
2444 return -ENOSYS;
2445 }
2446
2447 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2448 void __user *oldval, size_t __user *oldlenp,
2449 void __user *newval, size_t newlen, void **context)
2450 {
2451 return -ENOSYS;
2452 }
2453
2454 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2455 void __user *oldval, size_t __user *oldlenp,
2456 void __user *newval, size_t newlen, void **context)
2457 {
2458 return -ENOSYS;
2459 }
2460
2461 int proc_dostring(ctl_table *table, int write, struct file *filp,
2462 void __user *buffer, size_t *lenp, loff_t *ppos)
2463 {
2464 return -ENOSYS;
2465 }
2466
2467 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2468 void __user *buffer, size_t *lenp, loff_t *ppos)
2469 {
2470 return -ENOSYS;
2471 }
2472
2473 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2474 void __user *buffer, size_t *lenp, loff_t *ppos)
2475 {
2476 return -ENOSYS;
2477 }
2478
2479 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2480 void __user *buffer, size_t *lenp, loff_t *ppos)
2481 {
2482 return -ENOSYS;
2483 }
2484
2485 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2486 void __user *buffer, size_t *lenp, loff_t *ppos)
2487 {
2488 return -ENOSYS;
2489 }
2490
2491 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2492 void __user *buffer, size_t *lenp, loff_t *ppos)
2493 {
2494 return -ENOSYS;
2495 }
2496
2497 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2498 void __user *buffer, size_t *lenp, loff_t *ppos)
2499 {
2500 return -ENOSYS;
2501 }
2502
2503 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2504 void __user *buffer, size_t *lenp, loff_t *ppos)
2505 {
2506 return -ENOSYS;
2507 }
2508
2509 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2510 struct file *filp,
2511 void __user *buffer,
2512 size_t *lenp, loff_t *ppos)
2513 {
2514 return -ENOSYS;
2515 }
2516
2517 struct ctl_table_header * register_sysctl_table(ctl_table * table,
2518 int insert_at_head)
2519 {
2520 return NULL;
2521 }
2522
2523 void unregister_sysctl_table(struct ctl_table_header * table)
2524 {
2525 }
2526
2527 #endif /* CONFIG_SYSCTL */
2528
2529 /*
2530 * No sense putting this after each symbol definition, twice,
2531 * exception granted :-)
2532 */
2533 EXPORT_SYMBOL(proc_dointvec);
2534 EXPORT_SYMBOL(proc_dointvec_jiffies);
2535 EXPORT_SYMBOL(proc_dointvec_minmax);
2536 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2537 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2538 EXPORT_SYMBOL(proc_dostring);
2539 EXPORT_SYMBOL(proc_doulongvec_minmax);
2540 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2541 EXPORT_SYMBOL(register_sysctl_table);
2542 EXPORT_SYMBOL(sysctl_intvec);
2543 EXPORT_SYMBOL(sysctl_jiffies);
2544 EXPORT_SYMBOL(sysctl_ms_jiffies);
2545 EXPORT_SYMBOL(sysctl_string);
2546 EXPORT_SYMBOL(unregister_sysctl_table);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree