2 * sysctl.c: General linux system control interface
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
21 #include <linux/config.h>
22 #include <linux/module.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/proc_fs.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/capability.h>
31 #include <linux/smp_lock.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/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/security.h>
41 #include <linux/initrd.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
47 #include <asm/uaccess.h>
48 #include <asm/processor.h>
50 #ifdef CONFIG_ROOT_NFS
51 #include <linux/nfs_fs.h>
54 #if defined(CONFIG_SYSCTL)
56 /* External variables not in a header file. */
58 extern int sysctl_overcommit_memory
;
59 extern int sysctl_overcommit_ratio
;
60 extern int max_threads
;
61 extern int sysrq_enabled
;
62 extern int core_uses_pid
;
63 extern int suid_dumpable
;
64 extern char core_pattern
[];
67 extern int min_free_kbytes
;
68 extern int printk_ratelimit_jiffies
;
69 extern int printk_ratelimit_burst
;
70 extern int pid_max_min
, pid_max_max
;
71 extern int sysctl_drop_caches
;
72 extern int percpu_pagelist_fraction
;
74 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
75 int unknown_nmi_panic
;
76 extern int proc_unknown_nmi_panic(ctl_table
*, int, struct file
*,
77 void __user
*, size_t *, loff_t
*);
80 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
81 static int maxolduid
= 65535;
83 static int min_percpu_pagelist_fract
= 8;
85 static int ngroups_max
= NGROUPS_MAX
;
88 extern char modprobe_path
[];
90 #ifdef CONFIG_CHR_DEV_SG
91 extern int sg_big_buff
;
94 extern size_t shm_ctlmax
;
95 extern size_t shm_ctlall
;
96 extern int shm_ctlmni
;
97 extern int msg_ctlmax
;
98 extern int msg_ctlmnb
;
99 extern int msg_ctlmni
;
100 extern int sem_ctls
[];
104 extern char reboot_command
[];
105 extern int stop_a_enabled
;
106 extern int scons_pwroff
;
110 extern int pwrsw_enabled
;
111 extern int unaligned_enabled
;
115 #ifdef CONFIG_MATHEMU
116 extern int sysctl_ieee_emulation_warnings
;
118 extern int sysctl_userprocess_debug
;
119 extern int spin_retry
;
122 extern int sysctl_hz_timer
;
124 #ifdef CONFIG_BSD_PROCESS_ACCT
125 extern int acct_parm
[];
128 int randomize_va_space
= 1;
130 static int parse_table(int __user
*, int, void __user
*, size_t __user
*, void __user
*, size_t,
131 ctl_table
*, void **);
132 static int proc_doutsstring(ctl_table
*table
, int write
, struct file
*filp
,
133 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
135 static ctl_table root_table
[];
136 static struct ctl_table_header root_table_header
=
137 { root_table
, LIST_HEAD_INIT(root_table_header
.ctl_entry
) };
139 static ctl_table kern_table
[];
140 static ctl_table vm_table
[];
141 static ctl_table proc_table
[];
142 static ctl_table fs_table
[];
143 static ctl_table debug_table
[];
144 static ctl_table dev_table
[];
145 extern ctl_table random_table
[];
146 #ifdef CONFIG_UNIX98_PTYS
147 extern ctl_table pty_table
[];
149 #ifdef CONFIG_INOTIFY
150 extern ctl_table inotify_table
[];
153 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
154 int sysctl_legacy_va_layout
;
157 /* /proc declarations: */
159 #ifdef CONFIG_PROC_FS
161 static ssize_t
proc_readsys(struct file
*, char __user
*, size_t, loff_t
*);
162 static ssize_t
proc_writesys(struct file
*, const char __user
*, size_t, loff_t
*);
163 static int proc_opensys(struct inode
*, struct file
*);
165 struct file_operations proc_sys_file_operations
= {
166 .open
= proc_opensys
,
167 .read
= proc_readsys
,
168 .write
= proc_writesys
,
171 extern struct proc_dir_entry
*proc_sys_root
;
173 static void register_proc_table(ctl_table
*, struct proc_dir_entry
*, void *);
174 static void unregister_proc_table(ctl_table
*, struct proc_dir_entry
*);
177 /* The default sysctl tables: */
179 static ctl_table root_table
[] = {
181 .ctl_name
= CTL_KERN
,
182 .procname
= "kernel",
201 .ctl_name
= CTL_PROC
,
213 .ctl_name
= CTL_DEBUG
,
216 .child
= debug_table
,
228 static ctl_table kern_table
[] = {
230 .ctl_name
= KERN_OSTYPE
,
231 .procname
= "ostype",
232 .data
= system_utsname
.sysname
,
233 .maxlen
= sizeof(system_utsname
.sysname
),
235 .proc_handler
= &proc_doutsstring
,
236 .strategy
= &sysctl_string
,
239 .ctl_name
= KERN_OSRELEASE
,
240 .procname
= "osrelease",
241 .data
= system_utsname
.release
,
242 .maxlen
= sizeof(system_utsname
.release
),
244 .proc_handler
= &proc_doutsstring
,
245 .strategy
= &sysctl_string
,
248 .ctl_name
= KERN_VERSION
,
249 .procname
= "version",
250 .data
= system_utsname
.version
,
251 .maxlen
= sizeof(system_utsname
.version
),
253 .proc_handler
= &proc_doutsstring
,
254 .strategy
= &sysctl_string
,
257 .ctl_name
= KERN_NODENAME
,
258 .procname
= "hostname",
259 .data
= system_utsname
.nodename
,
260 .maxlen
= sizeof(system_utsname
.nodename
),
262 .proc_handler
= &proc_doutsstring
,
263 .strategy
= &sysctl_string
,
266 .ctl_name
= KERN_DOMAINNAME
,
267 .procname
= "domainname",
268 .data
= system_utsname
.domainname
,
269 .maxlen
= sizeof(system_utsname
.domainname
),
271 .proc_handler
= &proc_doutsstring
,
272 .strategy
= &sysctl_string
,
275 .ctl_name
= KERN_PANIC
,
277 .data
= &panic_timeout
,
278 .maxlen
= sizeof(int),
280 .proc_handler
= &proc_dointvec
,
283 .ctl_name
= KERN_CORE_USES_PID
,
284 .procname
= "core_uses_pid",
285 .data
= &core_uses_pid
,
286 .maxlen
= sizeof(int),
288 .proc_handler
= &proc_dointvec
,
291 .ctl_name
= KERN_CORE_PATTERN
,
292 .procname
= "core_pattern",
293 .data
= core_pattern
,
296 .proc_handler
= &proc_dostring
,
297 .strategy
= &sysctl_string
,
300 .ctl_name
= KERN_TAINTED
,
301 .procname
= "tainted",
303 .maxlen
= sizeof(int),
305 .proc_handler
= &proc_dointvec
,
308 .ctl_name
= KERN_CAP_BSET
,
309 .procname
= "cap-bound",
311 .maxlen
= sizeof(kernel_cap_t
),
313 .proc_handler
= &proc_dointvec_bset
,
315 #ifdef CONFIG_BLK_DEV_INITRD
317 .ctl_name
= KERN_REALROOTDEV
,
318 .procname
= "real-root-dev",
319 .data
= &real_root_dev
,
320 .maxlen
= sizeof(int),
322 .proc_handler
= &proc_dointvec
,
327 .ctl_name
= KERN_SPARC_REBOOT
,
328 .procname
= "reboot-cmd",
329 .data
= reboot_command
,
332 .proc_handler
= &proc_dostring
,
333 .strategy
= &sysctl_string
,
336 .ctl_name
= KERN_SPARC_STOP_A
,
337 .procname
= "stop-a",
338 .data
= &stop_a_enabled
,
339 .maxlen
= sizeof (int),
341 .proc_handler
= &proc_dointvec
,
344 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
345 .procname
= "scons-poweroff",
346 .data
= &scons_pwroff
,
347 .maxlen
= sizeof (int),
349 .proc_handler
= &proc_dointvec
,
354 .ctl_name
= KERN_HPPA_PWRSW
,
355 .procname
= "soft-power",
356 .data
= &pwrsw_enabled
,
357 .maxlen
= sizeof (int),
359 .proc_handler
= &proc_dointvec
,
362 .ctl_name
= KERN_HPPA_UNALIGNED
,
363 .procname
= "unaligned-trap",
364 .data
= &unaligned_enabled
,
365 .maxlen
= sizeof (int),
367 .proc_handler
= &proc_dointvec
,
371 .ctl_name
= KERN_CTLALTDEL
,
372 .procname
= "ctrl-alt-del",
374 .maxlen
= sizeof(int),
376 .proc_handler
= &proc_dointvec
,
379 .ctl_name
= KERN_PRINTK
,
380 .procname
= "printk",
381 .data
= &console_loglevel
,
382 .maxlen
= 4*sizeof(int),
384 .proc_handler
= &proc_dointvec
,
388 .ctl_name
= KERN_MODPROBE
,
389 .procname
= "modprobe",
390 .data
= &modprobe_path
,
391 .maxlen
= KMOD_PATH_LEN
,
393 .proc_handler
= &proc_dostring
,
394 .strategy
= &sysctl_string
,
397 #ifdef CONFIG_HOTPLUG
399 .ctl_name
= KERN_HOTPLUG
,
400 .procname
= "hotplug",
401 .data
= &uevent_helper
,
402 .maxlen
= UEVENT_HELPER_PATH_LEN
,
404 .proc_handler
= &proc_dostring
,
405 .strategy
= &sysctl_string
,
408 #ifdef CONFIG_CHR_DEV_SG
410 .ctl_name
= KERN_SG_BIG_BUFF
,
411 .procname
= "sg-big-buff",
412 .data
= &sg_big_buff
,
413 .maxlen
= sizeof (int),
415 .proc_handler
= &proc_dointvec
,
418 #ifdef CONFIG_BSD_PROCESS_ACCT
420 .ctl_name
= KERN_ACCT
,
423 .maxlen
= 3*sizeof(int),
425 .proc_handler
= &proc_dointvec
,
428 #ifdef CONFIG_SYSVIPC
430 .ctl_name
= KERN_SHMMAX
,
431 .procname
= "shmmax",
433 .maxlen
= sizeof (size_t),
435 .proc_handler
= &proc_doulongvec_minmax
,
438 .ctl_name
= KERN_SHMALL
,
439 .procname
= "shmall",
441 .maxlen
= sizeof (size_t),
443 .proc_handler
= &proc_doulongvec_minmax
,
446 .ctl_name
= KERN_SHMMNI
,
447 .procname
= "shmmni",
449 .maxlen
= sizeof (int),
451 .proc_handler
= &proc_dointvec
,
454 .ctl_name
= KERN_MSGMAX
,
455 .procname
= "msgmax",
457 .maxlen
= sizeof (int),
459 .proc_handler
= &proc_dointvec
,
462 .ctl_name
= KERN_MSGMNI
,
463 .procname
= "msgmni",
465 .maxlen
= sizeof (int),
467 .proc_handler
= &proc_dointvec
,
470 .ctl_name
= KERN_MSGMNB
,
471 .procname
= "msgmnb",
473 .maxlen
= sizeof (int),
475 .proc_handler
= &proc_dointvec
,
478 .ctl_name
= KERN_SEM
,
481 .maxlen
= 4*sizeof (int),
483 .proc_handler
= &proc_dointvec
,
486 #ifdef CONFIG_MAGIC_SYSRQ
488 .ctl_name
= KERN_SYSRQ
,
490 .data
= &sysrq_enabled
,
491 .maxlen
= sizeof (int),
493 .proc_handler
= &proc_dointvec
,
497 .ctl_name
= KERN_CADPID
,
498 .procname
= "cad_pid",
500 .maxlen
= sizeof (int),
502 .proc_handler
= &proc_dointvec
,
505 .ctl_name
= KERN_MAX_THREADS
,
506 .procname
= "threads-max",
507 .data
= &max_threads
,
508 .maxlen
= sizeof(int),
510 .proc_handler
= &proc_dointvec
,
513 .ctl_name
= KERN_RANDOM
,
514 .procname
= "random",
516 .child
= random_table
,
518 #ifdef CONFIG_UNIX98_PTYS
520 .ctl_name
= KERN_PTY
,
527 .ctl_name
= KERN_OVERFLOWUID
,
528 .procname
= "overflowuid",
529 .data
= &overflowuid
,
530 .maxlen
= sizeof(int),
532 .proc_handler
= &proc_dointvec_minmax
,
533 .strategy
= &sysctl_intvec
,
534 .extra1
= &minolduid
,
535 .extra2
= &maxolduid
,
538 .ctl_name
= KERN_OVERFLOWGID
,
539 .procname
= "overflowgid",
540 .data
= &overflowgid
,
541 .maxlen
= sizeof(int),
543 .proc_handler
= &proc_dointvec_minmax
,
544 .strategy
= &sysctl_intvec
,
545 .extra1
= &minolduid
,
546 .extra2
= &maxolduid
,
549 #ifdef CONFIG_MATHEMU
551 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
552 .procname
= "ieee_emulation_warnings",
553 .data
= &sysctl_ieee_emulation_warnings
,
554 .maxlen
= sizeof(int),
556 .proc_handler
= &proc_dointvec
,
559 #ifdef CONFIG_NO_IDLE_HZ
561 .ctl_name
= KERN_HZ_TIMER
,
562 .procname
= "hz_timer",
563 .data
= &sysctl_hz_timer
,
564 .maxlen
= sizeof(int),
566 .proc_handler
= &proc_dointvec
,
570 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
571 .procname
= "userprocess_debug",
572 .data
= &sysctl_userprocess_debug
,
573 .maxlen
= sizeof(int),
575 .proc_handler
= &proc_dointvec
,
579 .ctl_name
= KERN_PIDMAX
,
580 .procname
= "pid_max",
582 .maxlen
= sizeof (int),
584 .proc_handler
= &proc_dointvec_minmax
,
585 .strategy
= sysctl_intvec
,
586 .extra1
= &pid_max_min
,
587 .extra2
= &pid_max_max
,
590 .ctl_name
= KERN_PANIC_ON_OOPS
,
591 .procname
= "panic_on_oops",
592 .data
= &panic_on_oops
,
593 .maxlen
= sizeof(int),
595 .proc_handler
= &proc_dointvec
,
598 .ctl_name
= KERN_PRINTK_RATELIMIT
,
599 .procname
= "printk_ratelimit",
600 .data
= &printk_ratelimit_jiffies
,
601 .maxlen
= sizeof(int),
603 .proc_handler
= &proc_dointvec_jiffies
,
604 .strategy
= &sysctl_jiffies
,
607 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
608 .procname
= "printk_ratelimit_burst",
609 .data
= &printk_ratelimit_burst
,
610 .maxlen
= sizeof(int),
612 .proc_handler
= &proc_dointvec
,
615 .ctl_name
= KERN_NGROUPS_MAX
,
616 .procname
= "ngroups_max",
617 .data
= &ngroups_max
,
618 .maxlen
= sizeof (int),
620 .proc_handler
= &proc_dointvec
,
622 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
624 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
625 .procname
= "unknown_nmi_panic",
626 .data
= &unknown_nmi_panic
,
627 .maxlen
= sizeof (int),
629 .proc_handler
= &proc_unknown_nmi_panic
,
632 #if defined(CONFIG_X86)
634 .ctl_name
= KERN_BOOTLOADER_TYPE
,
635 .procname
= "bootloader_type",
636 .data
= &bootloader_type
,
637 .maxlen
= sizeof (int),
639 .proc_handler
= &proc_dointvec
,
643 .ctl_name
= KERN_RANDOMIZE
,
644 .procname
= "randomize_va_space",
645 .data
= &randomize_va_space
,
646 .maxlen
= sizeof(int),
648 .proc_handler
= &proc_dointvec
,
650 #if defined(CONFIG_S390)
652 .ctl_name
= KERN_SPIN_RETRY
,
653 .procname
= "spin_retry",
655 .maxlen
= sizeof (int),
657 .proc_handler
= &proc_dointvec
,
663 /* Constants for minimum and maximum testing in vm_table.
664 We use these as one-element integer vectors. */
666 static int one_hundred
= 100;
669 static ctl_table vm_table
[] = {
671 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
672 .procname
= "overcommit_memory",
673 .data
= &sysctl_overcommit_memory
,
674 .maxlen
= sizeof(sysctl_overcommit_memory
),
676 .proc_handler
= &proc_dointvec
,
679 .ctl_name
= VM_OVERCOMMIT_RATIO
,
680 .procname
= "overcommit_ratio",
681 .data
= &sysctl_overcommit_ratio
,
682 .maxlen
= sizeof(sysctl_overcommit_ratio
),
684 .proc_handler
= &proc_dointvec
,
687 .ctl_name
= VM_PAGE_CLUSTER
,
688 .procname
= "page-cluster",
689 .data
= &page_cluster
,
690 .maxlen
= sizeof(int),
692 .proc_handler
= &proc_dointvec
,
695 .ctl_name
= VM_DIRTY_BACKGROUND
,
696 .procname
= "dirty_background_ratio",
697 .data
= &dirty_background_ratio
,
698 .maxlen
= sizeof(dirty_background_ratio
),
700 .proc_handler
= &proc_dointvec_minmax
,
701 .strategy
= &sysctl_intvec
,
703 .extra2
= &one_hundred
,
706 .ctl_name
= VM_DIRTY_RATIO
,
707 .procname
= "dirty_ratio",
708 .data
= &vm_dirty_ratio
,
709 .maxlen
= sizeof(vm_dirty_ratio
),
711 .proc_handler
= &proc_dointvec_minmax
,
712 .strategy
= &sysctl_intvec
,
714 .extra2
= &one_hundred
,
717 .ctl_name
= VM_DIRTY_WB_CS
,
718 .procname
= "dirty_writeback_centisecs",
719 .data
= &dirty_writeback_centisecs
,
720 .maxlen
= sizeof(dirty_writeback_centisecs
),
722 .proc_handler
= &dirty_writeback_centisecs_handler
,
725 .ctl_name
= VM_DIRTY_EXPIRE_CS
,
726 .procname
= "dirty_expire_centisecs",
727 .data
= &dirty_expire_centisecs
,
728 .maxlen
= sizeof(dirty_expire_centisecs
),
730 .proc_handler
= &proc_dointvec
,
733 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
734 .procname
= "nr_pdflush_threads",
735 .data
= &nr_pdflush_threads
,
736 .maxlen
= sizeof nr_pdflush_threads
,
737 .mode
= 0444 /* read-only*/,
738 .proc_handler
= &proc_dointvec
,
741 .ctl_name
= VM_SWAPPINESS
,
742 .procname
= "swappiness",
743 .data
= &vm_swappiness
,
744 .maxlen
= sizeof(vm_swappiness
),
746 .proc_handler
= &proc_dointvec_minmax
,
747 .strategy
= &sysctl_intvec
,
749 .extra2
= &one_hundred
,
751 #ifdef CONFIG_HUGETLB_PAGE
753 .ctl_name
= VM_HUGETLB_PAGES
,
754 .procname
= "nr_hugepages",
755 .data
= &max_huge_pages
,
756 .maxlen
= sizeof(unsigned long),
758 .proc_handler
= &hugetlb_sysctl_handler
,
759 .extra1
= (void *)&hugetlb_zero
,
760 .extra2
= (void *)&hugetlb_infinity
,
763 .ctl_name
= VM_HUGETLB_GROUP
,
764 .procname
= "hugetlb_shm_group",
765 .data
= &sysctl_hugetlb_shm_group
,
766 .maxlen
= sizeof(gid_t
),
768 .proc_handler
= &proc_dointvec
,
772 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
773 .procname
= "lowmem_reserve_ratio",
774 .data
= &sysctl_lowmem_reserve_ratio
,
775 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
777 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
778 .strategy
= &sysctl_intvec
,
781 .ctl_name
= VM_DROP_PAGECACHE
,
782 .procname
= "drop_caches",
783 .data
= &sysctl_drop_caches
,
784 .maxlen
= sizeof(int),
786 .proc_handler
= drop_caches_sysctl_handler
,
787 .strategy
= &sysctl_intvec
,
790 .ctl_name
= VM_MIN_FREE_KBYTES
,
791 .procname
= "min_free_kbytes",
792 .data
= &min_free_kbytes
,
793 .maxlen
= sizeof(min_free_kbytes
),
795 .proc_handler
= &min_free_kbytes_sysctl_handler
,
796 .strategy
= &sysctl_intvec
,
800 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
801 .procname
= "percpu_pagelist_fraction",
802 .data
= &percpu_pagelist_fraction
,
803 .maxlen
= sizeof(percpu_pagelist_fraction
),
805 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
806 .strategy
= &sysctl_intvec
,
807 .extra1
= &min_percpu_pagelist_fract
,
811 .ctl_name
= VM_MAX_MAP_COUNT
,
812 .procname
= "max_map_count",
813 .data
= &sysctl_max_map_count
,
814 .maxlen
= sizeof(sysctl_max_map_count
),
816 .proc_handler
= &proc_dointvec
820 .ctl_name
= VM_LAPTOP_MODE
,
821 .procname
= "laptop_mode",
822 .data
= &laptop_mode
,
823 .maxlen
= sizeof(laptop_mode
),
825 .proc_handler
= &proc_dointvec
,
826 .strategy
= &sysctl_intvec
,
830 .ctl_name
= VM_BLOCK_DUMP
,
831 .procname
= "block_dump",
833 .maxlen
= sizeof(block_dump
),
835 .proc_handler
= &proc_dointvec
,
836 .strategy
= &sysctl_intvec
,
840 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
841 .procname
= "vfs_cache_pressure",
842 .data
= &sysctl_vfs_cache_pressure
,
843 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
845 .proc_handler
= &proc_dointvec
,
846 .strategy
= &sysctl_intvec
,
849 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
851 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
852 .procname
= "legacy_va_layout",
853 .data
= &sysctl_legacy_va_layout
,
854 .maxlen
= sizeof(sysctl_legacy_va_layout
),
856 .proc_handler
= &proc_dointvec
,
857 .strategy
= &sysctl_intvec
,
863 .ctl_name
= VM_SWAP_TOKEN_TIMEOUT
,
864 .procname
= "swap_token_timeout",
865 .data
= &swap_token_default_timeout
,
866 .maxlen
= sizeof(swap_token_default_timeout
),
868 .proc_handler
= &proc_dointvec_jiffies
,
869 .strategy
= &sysctl_jiffies
,
875 static ctl_table proc_table
[] = {
879 static ctl_table fs_table
[] = {
881 .ctl_name
= FS_NRINODE
,
882 .procname
= "inode-nr",
883 .data
= &inodes_stat
,
884 .maxlen
= 2*sizeof(int),
886 .proc_handler
= &proc_dointvec
,
889 .ctl_name
= FS_STATINODE
,
890 .procname
= "inode-state",
891 .data
= &inodes_stat
,
892 .maxlen
= 7*sizeof(int),
894 .proc_handler
= &proc_dointvec
,
897 .ctl_name
= FS_NRFILE
,
898 .procname
= "file-nr",
900 .maxlen
= 3*sizeof(int),
902 .proc_handler
= &proc_dointvec
,
905 .ctl_name
= FS_MAXFILE
,
906 .procname
= "file-max",
907 .data
= &files_stat
.max_files
,
908 .maxlen
= sizeof(int),
910 .proc_handler
= &proc_dointvec
,
913 .ctl_name
= FS_DENTRY
,
914 .procname
= "dentry-state",
915 .data
= &dentry_stat
,
916 .maxlen
= 6*sizeof(int),
918 .proc_handler
= &proc_dointvec
,
921 .ctl_name
= FS_OVERFLOWUID
,
922 .procname
= "overflowuid",
923 .data
= &fs_overflowuid
,
924 .maxlen
= sizeof(int),
926 .proc_handler
= &proc_dointvec_minmax
,
927 .strategy
= &sysctl_intvec
,
928 .extra1
= &minolduid
,
929 .extra2
= &maxolduid
,
932 .ctl_name
= FS_OVERFLOWGID
,
933 .procname
= "overflowgid",
934 .data
= &fs_overflowgid
,
935 .maxlen
= sizeof(int),
937 .proc_handler
= &proc_dointvec_minmax
,
938 .strategy
= &sysctl_intvec
,
939 .extra1
= &minolduid
,
940 .extra2
= &maxolduid
,
943 .ctl_name
= FS_LEASES
,
944 .procname
= "leases-enable",
945 .data
= &leases_enable
,
946 .maxlen
= sizeof(int),
948 .proc_handler
= &proc_dointvec
,
950 #ifdef CONFIG_DNOTIFY
952 .ctl_name
= FS_DIR_NOTIFY
,
953 .procname
= "dir-notify-enable",
954 .data
= &dir_notify_enable
,
955 .maxlen
= sizeof(int),
957 .proc_handler
= &proc_dointvec
,
962 .ctl_name
= FS_LEASE_TIME
,
963 .procname
= "lease-break-time",
964 .data
= &lease_break_time
,
965 .maxlen
= sizeof(int),
967 .proc_handler
= &proc_dointvec
,
970 .ctl_name
= FS_AIO_NR
,
971 .procname
= "aio-nr",
973 .maxlen
= sizeof(aio_nr
),
975 .proc_handler
= &proc_doulongvec_minmax
,
978 .ctl_name
= FS_AIO_MAX_NR
,
979 .procname
= "aio-max-nr",
981 .maxlen
= sizeof(aio_max_nr
),
983 .proc_handler
= &proc_doulongvec_minmax
,
985 #ifdef CONFIG_INOTIFY
987 .ctl_name
= FS_INOTIFY
,
988 .procname
= "inotify",
990 .child
= inotify_table
,
995 .ctl_name
= KERN_SETUID_DUMPABLE
,
996 .procname
= "suid_dumpable",
997 .data
= &suid_dumpable
,
998 .maxlen
= sizeof(int),
1000 .proc_handler
= &proc_dointvec
,
1005 static ctl_table debug_table
[] = {
1009 static ctl_table dev_table
[] = {
1013 extern void init_irq_proc (void);
1015 static DEFINE_SPINLOCK(sysctl_lock
);
1017 /* called under sysctl_lock */
1018 static int use_table(struct ctl_table_header
*p
)
1020 if (unlikely(p
->unregistering
))
1026 /* called under sysctl_lock */
1027 static void unuse_table(struct ctl_table_header
*p
)
1030 if (unlikely(p
->unregistering
))
1031 complete(p
->unregistering
);
1034 /* called under sysctl_lock, will reacquire if has to wait */
1035 static void start_unregistering(struct ctl_table_header
*p
)
1038 * if p->used is 0, nobody will ever touch that entry again;
1039 * we'll eliminate all paths to it before dropping sysctl_lock
1041 if (unlikely(p
->used
)) {
1042 struct completion wait
;
1043 init_completion(&wait
);
1044 p
->unregistering
= &wait
;
1045 spin_unlock(&sysctl_lock
);
1046 wait_for_completion(&wait
);
1047 spin_lock(&sysctl_lock
);
1050 * do not remove from the list until nobody holds it; walking the
1051 * list in do_sysctl() relies on that.
1053 list_del_init(&p
->ctl_entry
);
1056 void __init
sysctl_init(void)
1058 #ifdef CONFIG_PROC_FS
1059 register_proc_table(root_table
, proc_sys_root
, &root_table_header
);
1064 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1065 void __user
*newval
, size_t newlen
)
1067 struct list_head
*tmp
;
1068 int error
= -ENOTDIR
;
1070 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1074 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1077 spin_lock(&sysctl_lock
);
1078 tmp
= &root_table_header
.ctl_entry
;
1080 struct ctl_table_header
*head
=
1081 list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1082 void *context
= NULL
;
1084 if (!use_table(head
))
1087 spin_unlock(&sysctl_lock
);
1089 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1090 newval
, newlen
, head
->ctl_table
,
1094 spin_lock(&sysctl_lock
);
1096 if (error
!= -ENOTDIR
)
1098 } while ((tmp
= tmp
->next
) != &root_table_header
.ctl_entry
);
1099 spin_unlock(&sysctl_lock
);
1103 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1105 struct __sysctl_args tmp
;
1108 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1112 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1113 tmp
.newval
, tmp
.newlen
);
1119 * ctl_perm does NOT grant the superuser all rights automatically, because
1120 * some sysctl variables are readonly even to root.
1123 static int test_perm(int mode
, int op
)
1127 else if (in_egroup_p(0))
1129 if ((mode
& op
& 0007) == op
)
1134 static inline int ctl_perm(ctl_table
*table
, int op
)
1137 error
= security_sysctl(table
, op
);
1140 return test_perm(table
->mode
, op
);
1143 static int parse_table(int __user
*name
, int nlen
,
1144 void __user
*oldval
, size_t __user
*oldlenp
,
1145 void __user
*newval
, size_t newlen
,
1146 ctl_table
*table
, void **context
)
1152 if (get_user(n
, name
))
1154 for ( ; table
->ctl_name
; table
++) {
1155 if (n
== table
->ctl_name
|| table
->ctl_name
== CTL_ANY
) {
1158 if (ctl_perm(table
, 001))
1160 if (table
->strategy
) {
1161 error
= table
->strategy(
1164 newval
, newlen
, context
);
1170 table
= table
->child
;
1173 error
= do_sysctl_strategy(table
, name
, nlen
,
1175 newval
, newlen
, context
);
1182 /* Perform the actual read/write of a sysctl table entry. */
1183 int do_sysctl_strategy (ctl_table
*table
,
1184 int __user
*name
, int nlen
,
1185 void __user
*oldval
, size_t __user
*oldlenp
,
1186 void __user
*newval
, size_t newlen
, void **context
)
1195 if (ctl_perm(table
, op
))
1198 if (table
->strategy
) {
1199 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1200 newval
, newlen
, context
);
1207 /* If there is no strategy routine, or if the strategy returns
1208 * zero, proceed with automatic r/w */
1209 if (table
->data
&& table
->maxlen
) {
1210 if (oldval
&& oldlenp
) {
1211 if (get_user(len
, oldlenp
))
1214 if (len
> table
->maxlen
)
1215 len
= table
->maxlen
;
1216 if(copy_to_user(oldval
, table
->data
, len
))
1218 if(put_user(len
, oldlenp
))
1222 if (newval
&& newlen
) {
1224 if (len
> table
->maxlen
)
1225 len
= table
->maxlen
;
1226 if(copy_from_user(table
->data
, newval
, len
))
1234 * register_sysctl_table - register a sysctl hierarchy
1235 * @table: the top-level table structure
1236 * @insert_at_head: whether the entry should be inserted in front or at the end
1238 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1239 * array. An entry with a ctl_name of 0 terminates the table.
1241 * The members of the &ctl_table structure are used as follows:
1243 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1244 * must be unique within that level of sysctl
1246 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1247 * enter a sysctl file
1249 * data - a pointer to data for use by proc_handler
1251 * maxlen - the maximum size in bytes of the data
1253 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1255 * child - a pointer to the child sysctl table if this entry is a directory, or
1258 * proc_handler - the text handler routine (described below)
1260 * strategy - the strategy routine (described below)
1262 * de - for internal use by the sysctl routines
1264 * extra1, extra2 - extra pointers usable by the proc handler routines
1266 * Leaf nodes in the sysctl tree will be represented by a single file
1267 * under /proc; non-leaf nodes will be represented by directories.
1269 * sysctl(2) can automatically manage read and write requests through
1270 * the sysctl table. The data and maxlen fields of the ctl_table
1271 * struct enable minimal validation of the values being written to be
1272 * performed, and the mode field allows minimal authentication.
1274 * More sophisticated management can be enabled by the provision of a
1275 * strategy routine with the table entry. This will be called before
1276 * any automatic read or write of the data is performed.
1278 * The strategy routine may return
1280 * < 0 - Error occurred (error is passed to user process)
1282 * 0 - OK - proceed with automatic read or write.
1284 * > 0 - OK - read or write has been done by the strategy routine, so
1285 * return immediately.
1287 * There must be a proc_handler routine for any terminal nodes
1288 * mirrored under /proc/sys (non-terminals are handled by a built-in
1289 * directory handler). Several default handlers are available to
1290 * cover common cases -
1292 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1293 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1294 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1296 * It is the handler's job to read the input buffer from user memory
1297 * and process it. The handler should return 0 on success.
1299 * This routine returns %NULL on a failure to register, and a pointer
1300 * to the table header on success.
1302 struct ctl_table_header
*register_sysctl_table(ctl_table
* table
,
1305 struct ctl_table_header
*tmp
;
1306 tmp
= kmalloc(sizeof(struct ctl_table_header
), GFP_KERNEL
);
1309 tmp
->ctl_table
= table
;
1310 INIT_LIST_HEAD(&tmp
->ctl_entry
);
1312 tmp
->unregistering
= NULL
;
1313 spin_lock(&sysctl_lock
);
1315 list_add(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1317 list_add_tail(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1318 spin_unlock(&sysctl_lock
);
1319 #ifdef CONFIG_PROC_FS
1320 register_proc_table(table
, proc_sys_root
, tmp
);
1326 * unregister_sysctl_table - unregister a sysctl table hierarchy
1327 * @header: the header returned from register_sysctl_table
1329 * Unregisters the sysctl table and all children. proc entries may not
1330 * actually be removed until they are no longer used by anyone.
1332 void unregister_sysctl_table(struct ctl_table_header
* header
)
1335 spin_lock(&sysctl_lock
);
1336 start_unregistering(header
);
1337 #ifdef CONFIG_PROC_FS
1338 unregister_proc_table(header
->ctl_table
, proc_sys_root
);
1340 spin_unlock(&sysctl_lock
);
1348 #ifdef CONFIG_PROC_FS
1350 /* Scan the sysctl entries in table and add them all into /proc */
1351 static void register_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
, void *set
)
1353 struct proc_dir_entry
*de
;
1357 for (; table
->ctl_name
; table
++) {
1358 /* Can't do anything without a proc name. */
1359 if (!table
->procname
)
1361 /* Maybe we can't do anything with it... */
1362 if (!table
->proc_handler
&& !table
->child
) {
1363 printk(KERN_WARNING
"SYSCTL: Can't register %s\n",
1368 len
= strlen(table
->procname
);
1372 if (table
->proc_handler
)
1376 for (de
= root
->subdir
; de
; de
= de
->next
) {
1377 if (proc_match(len
, table
->procname
, de
))
1380 /* If the subdir exists already, de is non-NULL */
1384 de
= create_proc_entry(table
->procname
, mode
, root
);
1388 de
->data
= (void *) table
;
1389 if (table
->proc_handler
)
1390 de
->proc_fops
= &proc_sys_file_operations
;
1393 if (de
->mode
& S_IFDIR
)
1394 register_proc_table(table
->child
, de
, set
);
1399 * Unregister a /proc sysctl table and any subdirectories.
1401 static void unregister_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
)
1403 struct proc_dir_entry
*de
;
1404 for (; table
->ctl_name
; table
++) {
1405 if (!(de
= table
->de
))
1407 if (de
->mode
& S_IFDIR
) {
1408 if (!table
->child
) {
1409 printk (KERN_ALERT
"Help - malformed sysctl tree on free\n");
1412 unregister_proc_table(table
->child
, de
);
1414 /* Don't unregister directories which still have entries.. */
1420 * In any case, mark the entry as goner; we'll keep it
1421 * around if it's busy, but we'll know to do nothing with
1422 * its fields. We are under sysctl_lock here.
1426 /* Don't unregister proc entries that are still being used.. */
1427 if (atomic_read(&de
->count
))
1431 remove_proc_entry(table
->procname
, root
);
1435 static ssize_t
do_rw_proc(int write
, struct file
* file
, char __user
* buf
,
1436 size_t count
, loff_t
*ppos
)
1439 struct proc_dir_entry
*de
= PDE(file
->f_dentry
->d_inode
);
1440 struct ctl_table
*table
;
1442 ssize_t error
= -ENOTDIR
;
1444 spin_lock(&sysctl_lock
);
1445 if (de
&& de
->data
&& use_table(de
->set
)) {
1447 * at that point we know that sysctl was not unregistered
1448 * and won't be until we finish
1450 spin_unlock(&sysctl_lock
);
1451 table
= (struct ctl_table
*) de
->data
;
1452 if (!table
|| !table
->proc_handler
)
1455 op
= (write
? 002 : 004);
1456 if (ctl_perm(table
, op
))
1459 /* careful: calling conventions are nasty here */
1461 error
= (*table
->proc_handler
)(table
, write
, file
,
1466 spin_lock(&sysctl_lock
);
1467 unuse_table(de
->set
);
1469 spin_unlock(&sysctl_lock
);
1473 static int proc_opensys(struct inode
*inode
, struct file
*file
)
1475 if (file
->f_mode
& FMODE_WRITE
) {
1477 * sysctl entries that are not writable,
1478 * are _NOT_ writable, capabilities or not.
1480 if (!(inode
->i_mode
& S_IWUSR
))
1487 static ssize_t
proc_readsys(struct file
* file
, char __user
* buf
,
1488 size_t count
, loff_t
*ppos
)
1490 return do_rw_proc(0, file
, buf
, count
, ppos
);
1493 static ssize_t
proc_writesys(struct file
* file
, const char __user
* buf
,
1494 size_t count
, loff_t
*ppos
)
1496 return do_rw_proc(1, file
, (char __user
*) buf
, count
, ppos
);
1500 * proc_dostring - read a string sysctl
1501 * @table: the sysctl table
1502 * @write: %TRUE if this is a write to the sysctl file
1503 * @filp: the file structure
1504 * @buffer: the user buffer
1505 * @lenp: the size of the user buffer
1506 * @ppos: file position
1508 * Reads/writes a string from/to the user buffer. If the kernel
1509 * buffer provided is not large enough to hold the string, the
1510 * string is truncated. The copied string is %NULL-terminated.
1511 * If the string is being read by the user process, it is copied
1512 * and a newline '\n' is added. It is truncated if the buffer is
1515 * Returns 0 on success.
1517 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
1518 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1524 if (!table
->data
|| !table
->maxlen
|| !*lenp
||
1525 (*ppos
&& !write
)) {
1533 while (len
< *lenp
) {
1534 if (get_user(c
, p
++))
1536 if (c
== 0 || c
== '\n')
1540 if (len
>= table
->maxlen
)
1541 len
= table
->maxlen
-1;
1542 if(copy_from_user(table
->data
, buffer
, len
))
1544 ((char *) table
->data
)[len
] = 0;
1547 len
= strlen(table
->data
);
1548 if (len
> table
->maxlen
)
1549 len
= table
->maxlen
;
1553 if(copy_to_user(buffer
, table
->data
, len
))
1556 if(put_user('\n', ((char __user
*) buffer
) + len
))
1567 * Special case of dostring for the UTS structure. This has locks
1568 * to observe. Should this be in kernel/sys.c ????
1571 static int proc_doutsstring(ctl_table
*table
, int write
, struct file
*filp
,
1572 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1577 down_read(&uts_sem
);
1578 r
=proc_dostring(table
,0,filp
,buffer
,lenp
, ppos
);
1581 down_write(&uts_sem
);
1582 r
=proc_dostring(table
,1,filp
,buffer
,lenp
, ppos
);
1588 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
1590 int write
, void *data
)
1593 *valp
= *negp
? -*lvalp
: *lvalp
;
1598 *lvalp
= (unsigned long)-val
;
1601 *lvalp
= (unsigned long)val
;
1607 static int do_proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1608 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
1609 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1610 int write
, void *data
),
1613 #define TMPBUFLEN 21
1614 int *i
, vleft
, first
=1, neg
, val
;
1618 char buf
[TMPBUFLEN
], *p
;
1619 char __user
*s
= buffer
;
1621 if (!table
->data
|| !table
->maxlen
|| !*lenp
||
1622 (*ppos
&& !write
)) {
1627 i
= (int *) table
->data
;
1628 vleft
= table
->maxlen
/ sizeof(*i
);
1632 conv
= do_proc_dointvec_conv
;
1634 for (; left
&& vleft
--; i
++, first
=0) {
1649 if (len
> sizeof(buf
) - 1)
1650 len
= sizeof(buf
) - 1;
1651 if (copy_from_user(buf
, s
, len
))
1655 if (*p
== '-' && left
> 1) {
1659 if (*p
< '0' || *p
> '9')
1662 lval
= simple_strtoul(p
, &p
, 0);
1665 if ((len
< left
) && *p
&& !isspace(*p
))
1672 if (conv(&neg
, &lval
, i
, 1, data
))
1679 if (conv(&neg
, &lval
, i
, 0, data
))
1682 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
1686 if(copy_to_user(s
, buf
, len
))
1693 if (!write
&& !first
&& left
) {
1694 if(put_user('\n', s
))
1701 if (get_user(c
, s
++))
1717 * proc_dointvec - read a vector of integers
1718 * @table: the sysctl table
1719 * @write: %TRUE if this is a write to the sysctl file
1720 * @filp: the file structure
1721 * @buffer: the user buffer
1722 * @lenp: the size of the user buffer
1723 * @ppos: file position
1725 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1726 * values from/to the user buffer, treated as an ASCII string.
1728 * Returns 0 on success.
1730 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1731 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1733 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1743 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
1745 int write
, void *data
)
1747 int op
= *(int *)data
;
1749 int val
= *negp
? -*lvalp
: *lvalp
;
1751 case OP_SET
: *valp
= val
; break;
1752 case OP_AND
: *valp
&= val
; break;
1753 case OP_OR
: *valp
|= val
; break;
1754 case OP_MAX
: if(*valp
< val
)
1757 case OP_MIN
: if(*valp
> val
)
1765 *lvalp
= (unsigned long)-val
;
1768 *lvalp
= (unsigned long)val
;
1775 * init may raise the set.
1778 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
1779 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1783 if (!capable(CAP_SYS_MODULE
)) {
1787 op
= (current
->pid
== 1) ? OP_SET
: OP_AND
;
1788 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1789 do_proc_dointvec_bset_conv
,&op
);
1792 struct do_proc_dointvec_minmax_conv_param
{
1797 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
1799 int write
, void *data
)
1801 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
1803 int val
= *negp
? -*lvalp
: *lvalp
;
1804 if ((param
->min
&& *param
->min
> val
) ||
1805 (param
->max
&& *param
->max
< val
))
1812 *lvalp
= (unsigned long)-val
;
1815 *lvalp
= (unsigned long)val
;
1822 * proc_dointvec_minmax - read a vector of integers with min/max values
1823 * @table: the sysctl table
1824 * @write: %TRUE if this is a write to the sysctl file
1825 * @filp: the file structure
1826 * @buffer: the user buffer
1827 * @lenp: the size of the user buffer
1828 * @ppos: file position
1830 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1831 * values from/to the user buffer, treated as an ASCII string.
1833 * This routine will ensure the values are within the range specified by
1834 * table->extra1 (min) and table->extra2 (max).
1836 * Returns 0 on success.
1838 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
1839 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1841 struct do_proc_dointvec_minmax_conv_param param
= {
1842 .min
= (int *) table
->extra1
,
1843 .max
= (int *) table
->extra2
,
1845 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
1846 do_proc_dointvec_minmax_conv
, ¶m
);
1849 static int do_proc_doulongvec_minmax(ctl_table
*table
, int write
,
1851 void __user
*buffer
,
1852 size_t *lenp
, loff_t
*ppos
,
1853 unsigned long convmul
,
1854 unsigned long convdiv
)
1856 #define TMPBUFLEN 21
1857 unsigned long *i
, *min
, *max
, val
;
1858 int vleft
, first
=1, neg
;
1860 char buf
[TMPBUFLEN
], *p
;
1861 char __user
*s
= buffer
;
1863 if (!table
->data
|| !table
->maxlen
|| !*lenp
||
1864 (*ppos
&& !write
)) {
1869 i
= (unsigned long *) table
->data
;
1870 min
= (unsigned long *) table
->extra1
;
1871 max
= (unsigned long *) table
->extra2
;
1872 vleft
= table
->maxlen
/ sizeof(unsigned long);
1875 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
1890 if (len
> TMPBUFLEN
-1)
1892 if (copy_from_user(buf
, s
, len
))
1896 if (*p
== '-' && left
> 1) {
1900 if (*p
< '0' || *p
> '9')
1902 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
1904 if ((len
< left
) && *p
&& !isspace(*p
))
1913 if ((min
&& val
< *min
) || (max
&& val
> *max
))
1920 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
1924 if(copy_to_user(s
, buf
, len
))
1931 if (!write
&& !first
&& left
) {
1932 if(put_user('\n', s
))
1939 if (get_user(c
, s
++))
1955 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1956 * @table: the sysctl table
1957 * @write: %TRUE if this is a write to the sysctl file
1958 * @filp: the file structure
1959 * @buffer: the user buffer
1960 * @lenp: the size of the user buffer
1961 * @ppos: file position
1963 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1964 * values from/to the user buffer, treated as an ASCII string.
1966 * This routine will ensure the values are within the range specified by
1967 * table->extra1 (min) and table->extra2 (max).
1969 * Returns 0 on success.
1971 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
1972 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1974 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
1978 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1979 * @table: the sysctl table
1980 * @write: %TRUE if this is a write to the sysctl file
1981 * @filp: the file structure
1982 * @buffer: the user buffer
1983 * @lenp: the size of the user buffer
1984 * @ppos: file position
1986 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1987 * values from/to the user buffer, treated as an ASCII string. The values
1988 * are treated as milliseconds, and converted to jiffies when they are stored.
1990 * This routine will ensure the values are within the range specified by
1991 * table->extra1 (min) and table->extra2 (max).
1993 * Returns 0 on success.
1995 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
1997 void __user
*buffer
,
1998 size_t *lenp
, loff_t
*ppos
)
2000 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2001 lenp
, ppos
, HZ
, 1000l);
2005 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2007 int write
, void *data
)
2010 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2016 lval
= (unsigned long)-val
;
2019 lval
= (unsigned long)val
;
2026 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2028 int write
, void *data
)
2031 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2037 lval
= (unsigned long)-val
;
2040 lval
= (unsigned long)val
;
2042 *lvalp
= jiffies_to_clock_t(lval
);
2047 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2049 int write
, void *data
)
2052 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2058 lval
= (unsigned long)-val
;
2061 lval
= (unsigned long)val
;
2063 *lvalp
= jiffies_to_msecs(lval
);
2069 * proc_dointvec_jiffies - read a vector of integers as seconds
2070 * @table: the sysctl table
2071 * @write: %TRUE if this is a write to the sysctl file
2072 * @filp: the file structure
2073 * @buffer: the user buffer
2074 * @lenp: the size of the user buffer
2075 * @ppos: file position
2077 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2078 * values from/to the user buffer, treated as an ASCII string.
2079 * The values read are assumed to be in seconds, and are converted into
2082 * Returns 0 on success.
2084 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2085 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2087 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2088 do_proc_dointvec_jiffies_conv
,NULL
);
2092 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2093 * @table: the sysctl table
2094 * @write: %TRUE if this is a write to the sysctl file
2095 * @filp: the file structure
2096 * @buffer: the user buffer
2097 * @lenp: the size of the user buffer
2098 * @ppos: pointer to the file position
2100 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2101 * values from/to the user buffer, treated as an ASCII string.
2102 * The values read are assumed to be in 1/USER_HZ seconds, and
2103 * are converted into jiffies.
2105 * Returns 0 on success.
2107 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2108 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2110 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2111 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2115 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2116 * @table: the sysctl table
2117 * @write: %TRUE if this is a write to the sysctl file
2118 * @filp: the file structure
2119 * @buffer: the user buffer
2120 * @lenp: the size of the user buffer
2121 * @ppos: file position
2122 * @ppos: the current position in the file
2124 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2125 * values from/to the user buffer, treated as an ASCII string.
2126 * The values read are assumed to be in 1/1000 seconds, and
2127 * are converted into jiffies.
2129 * Returns 0 on success.
2131 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2132 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2134 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2135 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2138 #else /* CONFIG_PROC_FS */
2140 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
2141 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2146 static int proc_doutsstring(ctl_table
*table
, int write
, struct file
*filp
,
2147 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2152 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2153 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2158 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
2159 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2164 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2165 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2170 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2171 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2176 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2177 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2182 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2183 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2188 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2189 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2194 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2196 void __user
*buffer
,
2197 size_t *lenp
, loff_t
*ppos
)
2203 #endif /* CONFIG_PROC_FS */
2207 * General sysctl support routines
2210 /* The generic string strategy routine: */
2211 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2212 void __user
*oldval
, size_t __user
*oldlenp
,
2213 void __user
*newval
, size_t newlen
, void **context
)
2215 if (!table
->data
|| !table
->maxlen
)
2218 if (oldval
&& oldlenp
) {
2220 if (get_user(bufsize
, oldlenp
))
2223 size_t len
= strlen(table
->data
), copied
;
2225 /* This shouldn't trigger for a well-formed sysctl */
2226 if (len
> table
->maxlen
)
2227 len
= table
->maxlen
;
2229 /* Copy up to a max of bufsize-1 bytes of the string */
2230 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2232 if (copy_to_user(oldval
, table
->data
, copied
) ||
2233 put_user(0, (char __user
*)(oldval
+ copied
)))
2235 if (put_user(len
, oldlenp
))
2239 if (newval
&& newlen
) {
2240 size_t len
= newlen
;
2241 if (len
> table
->maxlen
)
2242 len
= table
->maxlen
;
2243 if(copy_from_user(table
->data
, newval
, len
))
2245 if (len
== table
->maxlen
)
2247 ((char *) table
->data
)[len
] = 0;
2253 * This function makes sure that all of the integers in the vector
2254 * are between the minimum and maximum values given in the arrays
2255 * table->extra1 and table->extra2, respectively.
2257 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2258 void __user
*oldval
, size_t __user
*oldlenp
,
2259 void __user
*newval
, size_t newlen
, void **context
)
2262 if (newval
&& newlen
) {
2263 int __user
*vec
= (int __user
*) newval
;
2264 int *min
= (int *) table
->extra1
;
2265 int *max
= (int *) table
->extra2
;
2269 if (newlen
% sizeof(int) != 0)
2272 if (!table
->extra1
&& !table
->extra2
)
2275 if (newlen
> table
->maxlen
)
2276 newlen
= table
->maxlen
;
2277 length
= newlen
/ sizeof(int);
2279 for (i
= 0; i
< length
; i
++) {
2281 if (get_user(value
, vec
+ i
))
2283 if (min
&& value
< min
[i
])
2285 if (max
&& value
> max
[i
])
2292 /* Strategy function to convert jiffies to seconds */
2293 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2294 void __user
*oldval
, size_t __user
*oldlenp
,
2295 void __user
*newval
, size_t newlen
, void **context
)
2300 if (get_user(olen
, oldlenp
))
2302 if (olen
!=sizeof(int))
2305 if (put_user(*(int *)(table
->data
)/HZ
, (int __user
*)oldval
) ||
2306 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2309 if (newval
&& newlen
) {
2311 if (newlen
!= sizeof(int))
2313 if (get_user(new, (int __user
*)newval
))
2315 *(int *)(table
->data
) = new*HZ
;
2320 /* Strategy function to convert jiffies to seconds */
2321 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2322 void __user
*oldval
, size_t __user
*oldlenp
,
2323 void __user
*newval
, size_t newlen
, void **context
)
2328 if (get_user(olen
, oldlenp
))
2330 if (olen
!=sizeof(int))
2333 if (put_user(jiffies_to_msecs(*(int *)(table
->data
)), (int __user
*)oldval
) ||
2334 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2337 if (newval
&& newlen
) {
2339 if (newlen
!= sizeof(int))
2341 if (get_user(new, (int __user
*)newval
))
2343 *(int *)(table
->data
) = msecs_to_jiffies(new);
2348 #else /* CONFIG_SYSCTL */
2351 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2356 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2357 void __user
*oldval
, size_t __user
*oldlenp
,
2358 void __user
*newval
, size_t newlen
, void **context
)
2363 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2364 void __user
*oldval
, size_t __user
*oldlenp
,
2365 void __user
*newval
, size_t newlen
, void **context
)
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
)
2377 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2378 void __user
*oldval
, size_t __user
*oldlenp
,
2379 void __user
*newval
, size_t newlen
, void **context
)
2384 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
2385 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2390 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2391 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2396 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
2397 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2402 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2403 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2408 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2409 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2414 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2415 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2420 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2421 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2426 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2427 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2432 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2434 void __user
*buffer
,
2435 size_t *lenp
, loff_t
*ppos
)
2440 struct ctl_table_header
* register_sysctl_table(ctl_table
* table
,
2446 void unregister_sysctl_table(struct ctl_table_header
* table
)
2450 #endif /* CONFIG_SYSCTL */
2453 * No sense putting this after each symbol definition, twice,
2454 * exception granted :-)
2456 EXPORT_SYMBOL(proc_dointvec
);
2457 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2458 EXPORT_SYMBOL(proc_dointvec_minmax
);
2459 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2460 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2461 EXPORT_SYMBOL(proc_dostring
);
2462 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2463 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
2464 EXPORT_SYMBOL(register_sysctl_table
);
2465 EXPORT_SYMBOL(sysctl_intvec
);
2466 EXPORT_SYMBOL(sysctl_jiffies
);
2467 EXPORT_SYMBOL(sysctl_ms_jiffies
);
2468 EXPORT_SYMBOL(sysctl_string
);
2469 EXPORT_SYMBOL(unregister_sysctl_table
);