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/sysrq.h>
35 #include <linux/highuid.h>
36 #include <linux/writeback.h>
37 #include <linux/hugetlb.h>
38 #include <linux/security.h>
39 #include <linux/initrd.h>
40 #include <linux/times.h>
41 #include <linux/limits.h>
42 #include <linux/dcache.h>
43 #include <linux/syscalls.h>
45 #include <asm/uaccess.h>
46 #include <asm/processor.h>
48 #ifdef CONFIG_ROOT_NFS
49 #include <linux/nfs_fs.h>
52 #if defined(CONFIG_SYSCTL)
54 /* External variables not in a header file. */
56 extern int sysctl_overcommit_memory
;
57 extern int sysctl_overcommit_ratio
;
58 extern int max_threads
;
59 extern int sysrq_enabled
;
60 extern int core_uses_pid
;
61 extern int suid_dumpable
;
62 extern char core_pattern
[];
65 extern int min_free_kbytes
;
66 extern int printk_ratelimit_jiffies
;
67 extern int printk_ratelimit_burst
;
68 extern int pid_max_min
, pid_max_max
;
70 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
71 int unknown_nmi_panic
;
72 extern int proc_unknown_nmi_panic(ctl_table
*, int, struct file
*,
73 void __user
*, size_t *, loff_t
*);
76 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
77 static int maxolduid
= 65535;
80 static int ngroups_max
= NGROUPS_MAX
;
83 extern char modprobe_path
[];
86 extern char hotplug_path
[];
88 #ifdef CONFIG_CHR_DEV_SG
89 extern int sg_big_buff
;
92 extern size_t shm_ctlmax
;
93 extern size_t shm_ctlall
;
94 extern int shm_ctlmni
;
95 extern int msg_ctlmax
;
96 extern int msg_ctlmnb
;
97 extern int msg_ctlmni
;
98 extern int sem_ctls
[];
102 extern char reboot_command
[];
103 extern int stop_a_enabled
;
104 extern int scons_pwroff
;
108 extern int pwrsw_enabled
;
109 extern int unaligned_enabled
;
112 #ifdef CONFIG_ARCH_S390
113 #ifdef CONFIG_MATHEMU
114 extern int sysctl_ieee_emulation_warnings
;
116 extern int sysctl_userprocess_debug
;
119 extern int sysctl_hz_timer
;
121 #ifdef CONFIG_BSD_PROCESS_ACCT
122 extern int acct_parm
[];
125 int randomize_va_space
= 1;
127 static int parse_table(int __user
*, int, void __user
*, size_t __user
*, void __user
*, size_t,
128 ctl_table
*, void **);
129 static int proc_doutsstring(ctl_table
*table
, int write
, struct file
*filp
,
130 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
132 static ctl_table root_table
[];
133 static struct ctl_table_header root_table_header
=
134 { root_table
, LIST_HEAD_INIT(root_table_header
.ctl_entry
) };
136 static ctl_table kern_table
[];
137 static ctl_table vm_table
[];
139 extern ctl_table net_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
*);
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
= &hotplug_path
,
402 .maxlen
= HOTPLUG_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
,
548 #ifdef CONFIG_ARCH_S390
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
,
654 /* Constants for minimum and maximum testing in vm_table.
655 We use these as one-element integer vectors. */
657 static int one_hundred
= 100;
660 static ctl_table vm_table
[] = {
662 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
663 .procname
= "overcommit_memory",
664 .data
= &sysctl_overcommit_memory
,
665 .maxlen
= sizeof(sysctl_overcommit_memory
),
667 .proc_handler
= &proc_dointvec
,
670 .ctl_name
= VM_OVERCOMMIT_RATIO
,
671 .procname
= "overcommit_ratio",
672 .data
= &sysctl_overcommit_ratio
,
673 .maxlen
= sizeof(sysctl_overcommit_ratio
),
675 .proc_handler
= &proc_dointvec
,
678 .ctl_name
= VM_PAGE_CLUSTER
,
679 .procname
= "page-cluster",
680 .data
= &page_cluster
,
681 .maxlen
= sizeof(int),
683 .proc_handler
= &proc_dointvec
,
686 .ctl_name
= VM_DIRTY_BACKGROUND
,
687 .procname
= "dirty_background_ratio",
688 .data
= &dirty_background_ratio
,
689 .maxlen
= sizeof(dirty_background_ratio
),
691 .proc_handler
= &proc_dointvec_minmax
,
692 .strategy
= &sysctl_intvec
,
694 .extra2
= &one_hundred
,
697 .ctl_name
= VM_DIRTY_RATIO
,
698 .procname
= "dirty_ratio",
699 .data
= &vm_dirty_ratio
,
700 .maxlen
= sizeof(vm_dirty_ratio
),
702 .proc_handler
= &proc_dointvec_minmax
,
703 .strategy
= &sysctl_intvec
,
705 .extra2
= &one_hundred
,
708 .ctl_name
= VM_DIRTY_WB_CS
,
709 .procname
= "dirty_writeback_centisecs",
710 .data
= &dirty_writeback_centisecs
,
711 .maxlen
= sizeof(dirty_writeback_centisecs
),
713 .proc_handler
= &dirty_writeback_centisecs_handler
,
716 .ctl_name
= VM_DIRTY_EXPIRE_CS
,
717 .procname
= "dirty_expire_centisecs",
718 .data
= &dirty_expire_centisecs
,
719 .maxlen
= sizeof(dirty_expire_centisecs
),
721 .proc_handler
= &proc_dointvec
,
724 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
725 .procname
= "nr_pdflush_threads",
726 .data
= &nr_pdflush_threads
,
727 .maxlen
= sizeof nr_pdflush_threads
,
728 .mode
= 0444 /* read-only*/,
729 .proc_handler
= &proc_dointvec
,
732 .ctl_name
= VM_SWAPPINESS
,
733 .procname
= "swappiness",
734 .data
= &vm_swappiness
,
735 .maxlen
= sizeof(vm_swappiness
),
737 .proc_handler
= &proc_dointvec_minmax
,
738 .strategy
= &sysctl_intvec
,
740 .extra2
= &one_hundred
,
742 #ifdef CONFIG_HUGETLB_PAGE
744 .ctl_name
= VM_HUGETLB_PAGES
,
745 .procname
= "nr_hugepages",
746 .data
= &max_huge_pages
,
747 .maxlen
= sizeof(unsigned long),
749 .proc_handler
= &hugetlb_sysctl_handler
,
750 .extra1
= (void *)&hugetlb_zero
,
751 .extra2
= (void *)&hugetlb_infinity
,
754 .ctl_name
= VM_HUGETLB_GROUP
,
755 .procname
= "hugetlb_shm_group",
756 .data
= &sysctl_hugetlb_shm_group
,
757 .maxlen
= sizeof(gid_t
),
759 .proc_handler
= &proc_dointvec
,
763 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
764 .procname
= "lowmem_reserve_ratio",
765 .data
= &sysctl_lowmem_reserve_ratio
,
766 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
768 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
769 .strategy
= &sysctl_intvec
,
772 .ctl_name
= VM_MIN_FREE_KBYTES
,
773 .procname
= "min_free_kbytes",
774 .data
= &min_free_kbytes
,
775 .maxlen
= sizeof(min_free_kbytes
),
777 .proc_handler
= &min_free_kbytes_sysctl_handler
,
778 .strategy
= &sysctl_intvec
,
783 .ctl_name
= VM_MAX_MAP_COUNT
,
784 .procname
= "max_map_count",
785 .data
= &sysctl_max_map_count
,
786 .maxlen
= sizeof(sysctl_max_map_count
),
788 .proc_handler
= &proc_dointvec
792 .ctl_name
= VM_LAPTOP_MODE
,
793 .procname
= "laptop_mode",
794 .data
= &laptop_mode
,
795 .maxlen
= sizeof(laptop_mode
),
797 .proc_handler
= &proc_dointvec
,
798 .strategy
= &sysctl_intvec
,
802 .ctl_name
= VM_BLOCK_DUMP
,
803 .procname
= "block_dump",
805 .maxlen
= sizeof(block_dump
),
807 .proc_handler
= &proc_dointvec
,
808 .strategy
= &sysctl_intvec
,
812 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
813 .procname
= "vfs_cache_pressure",
814 .data
= &sysctl_vfs_cache_pressure
,
815 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
817 .proc_handler
= &proc_dointvec
,
818 .strategy
= &sysctl_intvec
,
821 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
823 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
824 .procname
= "legacy_va_layout",
825 .data
= &sysctl_legacy_va_layout
,
826 .maxlen
= sizeof(sysctl_legacy_va_layout
),
828 .proc_handler
= &proc_dointvec
,
829 .strategy
= &sysctl_intvec
,
835 .ctl_name
= VM_SWAP_TOKEN_TIMEOUT
,
836 .procname
= "swap_token_timeout",
837 .data
= &swap_token_default_timeout
,
838 .maxlen
= sizeof(swap_token_default_timeout
),
840 .proc_handler
= &proc_dointvec_jiffies
,
841 .strategy
= &sysctl_jiffies
,
847 static ctl_table proc_table
[] = {
851 static ctl_table fs_table
[] = {
853 .ctl_name
= FS_NRINODE
,
854 .procname
= "inode-nr",
855 .data
= &inodes_stat
,
856 .maxlen
= 2*sizeof(int),
858 .proc_handler
= &proc_dointvec
,
861 .ctl_name
= FS_STATINODE
,
862 .procname
= "inode-state",
863 .data
= &inodes_stat
,
864 .maxlen
= 7*sizeof(int),
866 .proc_handler
= &proc_dointvec
,
869 .ctl_name
= FS_NRFILE
,
870 .procname
= "file-nr",
872 .maxlen
= 3*sizeof(int),
874 .proc_handler
= &proc_dointvec
,
877 .ctl_name
= FS_MAXFILE
,
878 .procname
= "file-max",
879 .data
= &files_stat
.max_files
,
880 .maxlen
= sizeof(int),
882 .proc_handler
= &proc_dointvec
,
885 .ctl_name
= FS_DENTRY
,
886 .procname
= "dentry-state",
887 .data
= &dentry_stat
,
888 .maxlen
= 6*sizeof(int),
890 .proc_handler
= &proc_dointvec
,
893 .ctl_name
= FS_OVERFLOWUID
,
894 .procname
= "overflowuid",
895 .data
= &fs_overflowuid
,
896 .maxlen
= sizeof(int),
898 .proc_handler
= &proc_dointvec_minmax
,
899 .strategy
= &sysctl_intvec
,
900 .extra1
= &minolduid
,
901 .extra2
= &maxolduid
,
904 .ctl_name
= FS_OVERFLOWGID
,
905 .procname
= "overflowgid",
906 .data
= &fs_overflowgid
,
907 .maxlen
= sizeof(int),
909 .proc_handler
= &proc_dointvec_minmax
,
910 .strategy
= &sysctl_intvec
,
911 .extra1
= &minolduid
,
912 .extra2
= &maxolduid
,
915 .ctl_name
= FS_LEASES
,
916 .procname
= "leases-enable",
917 .data
= &leases_enable
,
918 .maxlen
= sizeof(int),
920 .proc_handler
= &proc_dointvec
,
922 #ifdef CONFIG_DNOTIFY
924 .ctl_name
= FS_DIR_NOTIFY
,
925 .procname
= "dir-notify-enable",
926 .data
= &dir_notify_enable
,
927 .maxlen
= sizeof(int),
929 .proc_handler
= &proc_dointvec
,
934 .ctl_name
= FS_LEASE_TIME
,
935 .procname
= "lease-break-time",
936 .data
= &lease_break_time
,
937 .maxlen
= sizeof(int),
939 .proc_handler
= &proc_dointvec
,
942 .ctl_name
= FS_AIO_NR
,
943 .procname
= "aio-nr",
945 .maxlen
= sizeof(aio_nr
),
947 .proc_handler
= &proc_dointvec
,
950 .ctl_name
= FS_AIO_MAX_NR
,
951 .procname
= "aio-max-nr",
953 .maxlen
= sizeof(aio_max_nr
),
955 .proc_handler
= &proc_dointvec
,
957 #ifdef CONFIG_INOTIFY
959 .ctl_name
= FS_INOTIFY
,
960 .procname
= "inotify",
962 .child
= inotify_table
,
967 .ctl_name
= KERN_SETUID_DUMPABLE
,
968 .procname
= "suid_dumpable",
969 .data
= &suid_dumpable
,
970 .maxlen
= sizeof(int),
972 .proc_handler
= &proc_dointvec
,
977 static ctl_table debug_table
[] = {
981 static ctl_table dev_table
[] = {
985 extern void init_irq_proc (void);
987 void __init
sysctl_init(void)
989 #ifdef CONFIG_PROC_FS
990 register_proc_table(root_table
, proc_sys_root
);
995 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
996 void __user
*newval
, size_t newlen
)
998 struct list_head
*tmp
;
1000 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1004 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1007 tmp
= &root_table_header
.ctl_entry
;
1009 struct ctl_table_header
*head
=
1010 list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1011 void *context
= NULL
;
1012 int error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1013 newval
, newlen
, head
->ctl_table
,
1016 if (error
!= -ENOTDIR
)
1019 } while (tmp
!= &root_table_header
.ctl_entry
);
1023 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1025 struct __sysctl_args tmp
;
1028 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1032 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1033 tmp
.newval
, tmp
.newlen
);
1039 * ctl_perm does NOT grant the superuser all rights automatically, because
1040 * some sysctl variables are readonly even to root.
1043 static int test_perm(int mode
, int op
)
1047 else if (in_egroup_p(0))
1049 if ((mode
& op
& 0007) == op
)
1054 static inline int ctl_perm(ctl_table
*table
, int op
)
1057 error
= security_sysctl(table
, op
);
1060 return test_perm(table
->mode
, op
);
1063 static int parse_table(int __user
*name
, int nlen
,
1064 void __user
*oldval
, size_t __user
*oldlenp
,
1065 void __user
*newval
, size_t newlen
,
1066 ctl_table
*table
, void **context
)
1072 if (get_user(n
, name
))
1074 for ( ; table
->ctl_name
; table
++) {
1075 if (n
== table
->ctl_name
|| table
->ctl_name
== CTL_ANY
) {
1078 if (ctl_perm(table
, 001))
1080 if (table
->strategy
) {
1081 error
= table
->strategy(
1084 newval
, newlen
, context
);
1090 table
= table
->child
;
1093 error
= do_sysctl_strategy(table
, name
, nlen
,
1095 newval
, newlen
, context
);
1102 /* Perform the actual read/write of a sysctl table entry. */
1103 int do_sysctl_strategy (ctl_table
*table
,
1104 int __user
*name
, int nlen
,
1105 void __user
*oldval
, size_t __user
*oldlenp
,
1106 void __user
*newval
, size_t newlen
, void **context
)
1115 if (ctl_perm(table
, op
))
1118 if (table
->strategy
) {
1119 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1120 newval
, newlen
, context
);
1127 /* If there is no strategy routine, or if the strategy returns
1128 * zero, proceed with automatic r/w */
1129 if (table
->data
&& table
->maxlen
) {
1130 if (oldval
&& oldlenp
) {
1131 if (get_user(len
, oldlenp
))
1134 if (len
> table
->maxlen
)
1135 len
= table
->maxlen
;
1136 if(copy_to_user(oldval
, table
->data
, len
))
1138 if(put_user(len
, oldlenp
))
1142 if (newval
&& newlen
) {
1144 if (len
> table
->maxlen
)
1145 len
= table
->maxlen
;
1146 if(copy_from_user(table
->data
, newval
, len
))
1154 * register_sysctl_table - register a sysctl hierarchy
1155 * @table: the top-level table structure
1156 * @insert_at_head: whether the entry should be inserted in front or at the end
1158 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1159 * array. An entry with a ctl_name of 0 terminates the table.
1161 * The members of the &ctl_table structure are used as follows:
1163 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1164 * must be unique within that level of sysctl
1166 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1167 * enter a sysctl file
1169 * data - a pointer to data for use by proc_handler
1171 * maxlen - the maximum size in bytes of the data
1173 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1175 * child - a pointer to the child sysctl table if this entry is a directory, or
1178 * proc_handler - the text handler routine (described below)
1180 * strategy - the strategy routine (described below)
1182 * de - for internal use by the sysctl routines
1184 * extra1, extra2 - extra pointers usable by the proc handler routines
1186 * Leaf nodes in the sysctl tree will be represented by a single file
1187 * under /proc; non-leaf nodes will be represented by directories.
1189 * sysctl(2) can automatically manage read and write requests through
1190 * the sysctl table. The data and maxlen fields of the ctl_table
1191 * struct enable minimal validation of the values being written to be
1192 * performed, and the mode field allows minimal authentication.
1194 * More sophisticated management can be enabled by the provision of a
1195 * strategy routine with the table entry. This will be called before
1196 * any automatic read or write of the data is performed.
1198 * The strategy routine may return
1200 * < 0 - Error occurred (error is passed to user process)
1202 * 0 - OK - proceed with automatic read or write.
1204 * > 0 - OK - read or write has been done by the strategy routine, so
1205 * return immediately.
1207 * There must be a proc_handler routine for any terminal nodes
1208 * mirrored under /proc/sys (non-terminals are handled by a built-in
1209 * directory handler). Several default handlers are available to
1210 * cover common cases -
1212 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1213 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1214 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1216 * It is the handler's job to read the input buffer from user memory
1217 * and process it. The handler should return 0 on success.
1219 * This routine returns %NULL on a failure to register, and a pointer
1220 * to the table header on success.
1222 struct ctl_table_header
*register_sysctl_table(ctl_table
* table
,
1225 struct ctl_table_header
*tmp
;
1226 tmp
= kmalloc(sizeof(struct ctl_table_header
), GFP_KERNEL
);
1229 tmp
->ctl_table
= table
;
1230 INIT_LIST_HEAD(&tmp
->ctl_entry
);
1232 list_add(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1234 list_add_tail(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1235 #ifdef CONFIG_PROC_FS
1236 register_proc_table(table
, proc_sys_root
);
1242 * unregister_sysctl_table - unregister a sysctl table hierarchy
1243 * @header: the header returned from register_sysctl_table
1245 * Unregisters the sysctl table and all children. proc entries may not
1246 * actually be removed until they are no longer used by anyone.
1248 void unregister_sysctl_table(struct ctl_table_header
* header
)
1250 list_del(&header
->ctl_entry
);
1251 #ifdef CONFIG_PROC_FS
1252 unregister_proc_table(header
->ctl_table
, proc_sys_root
);
1261 #ifdef CONFIG_PROC_FS
1263 /* Scan the sysctl entries in table and add them all into /proc */
1264 static void register_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
)
1266 struct proc_dir_entry
*de
;
1270 for (; table
->ctl_name
; table
++) {
1271 /* Can't do anything without a proc name. */
1272 if (!table
->procname
)
1274 /* Maybe we can't do anything with it... */
1275 if (!table
->proc_handler
&& !table
->child
) {
1276 printk(KERN_WARNING
"SYSCTL: Can't register %s\n",
1281 len
= strlen(table
->procname
);
1285 if (table
->proc_handler
)
1289 for (de
= root
->subdir
; de
; de
= de
->next
) {
1290 if (proc_match(len
, table
->procname
, de
))
1293 /* If the subdir exists already, de is non-NULL */
1297 de
= create_proc_entry(table
->procname
, mode
, root
);
1300 de
->data
= (void *) table
;
1301 if (table
->proc_handler
)
1302 de
->proc_fops
= &proc_sys_file_operations
;
1305 if (de
->mode
& S_IFDIR
)
1306 register_proc_table(table
->child
, de
);
1311 * Unregister a /proc sysctl table and any subdirectories.
1313 static void unregister_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
)
1315 struct proc_dir_entry
*de
;
1316 for (; table
->ctl_name
; table
++) {
1317 if (!(de
= table
->de
))
1319 if (de
->mode
& S_IFDIR
) {
1320 if (!table
->child
) {
1321 printk (KERN_ALERT
"Help - malformed sysctl tree on free\n");
1324 unregister_proc_table(table
->child
, de
);
1326 /* Don't unregister directories which still have entries.. */
1331 /* Don't unregister proc entries that are still being used.. */
1332 if (atomic_read(&de
->count
))
1336 remove_proc_entry(table
->procname
, root
);
1340 static ssize_t
do_rw_proc(int write
, struct file
* file
, char __user
* buf
,
1341 size_t count
, loff_t
*ppos
)
1344 struct proc_dir_entry
*de
;
1345 struct ctl_table
*table
;
1349 de
= PDE(file
->f_dentry
->d_inode
);
1350 if (!de
|| !de
->data
)
1352 table
= (struct ctl_table
*) de
->data
;
1353 if (!table
|| !table
->proc_handler
)
1355 op
= (write
? 002 : 004);
1356 if (ctl_perm(table
, op
))
1361 error
= (*table
->proc_handler
) (table
, write
, file
, buf
, &res
, ppos
);
1367 static int proc_opensys(struct inode
*inode
, struct file
*file
)
1369 if (file
->f_mode
& FMODE_WRITE
) {
1371 * sysctl entries that are not writable,
1372 * are _NOT_ writable, capabilities or not.
1374 if (!(inode
->i_mode
& S_IWUSR
))
1381 static ssize_t
proc_readsys(struct file
* file
, char __user
* buf
,
1382 size_t count
, loff_t
*ppos
)
1384 return do_rw_proc(0, file
, buf
, count
, ppos
);
1387 static ssize_t
proc_writesys(struct file
* file
, const char __user
* buf
,
1388 size_t count
, loff_t
*ppos
)
1390 return do_rw_proc(1, file
, (char __user
*) buf
, count
, ppos
);
1394 * proc_dostring - read a string sysctl
1395 * @table: the sysctl table
1396 * @write: %TRUE if this is a write to the sysctl file
1397 * @filp: the file structure
1398 * @buffer: the user buffer
1399 * @lenp: the size of the user buffer
1400 * @ppos: file position
1402 * Reads/writes a string from/to the user buffer. If the kernel
1403 * buffer provided is not large enough to hold the string, the
1404 * string is truncated. The copied string is %NULL-terminated.
1405 * If the string is being read by the user process, it is copied
1406 * and a newline '\n' is added. It is truncated if the buffer is
1409 * Returns 0 on success.
1411 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
1412 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1418 if (!table
->data
|| !table
->maxlen
|| !*lenp
||
1419 (*ppos
&& !write
)) {
1427 while (len
< *lenp
) {
1428 if (get_user(c
, p
++))
1430 if (c
== 0 || c
== '\n')
1434 if (len
>= table
->maxlen
)
1435 len
= table
->maxlen
-1;
1436 if(copy_from_user(table
->data
, buffer
, len
))
1438 ((char *) table
->data
)[len
] = 0;
1441 len
= strlen(table
->data
);
1442 if (len
> table
->maxlen
)
1443 len
= table
->maxlen
;
1447 if(copy_to_user(buffer
, table
->data
, len
))
1450 if(put_user('\n', ((char __user
*) buffer
) + len
))
1461 * Special case of dostring for the UTS structure. This has locks
1462 * to observe. Should this be in kernel/sys.c ????
1465 static int proc_doutsstring(ctl_table
*table
, int write
, struct file
*filp
,
1466 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1471 down_read(&uts_sem
);
1472 r
=proc_dostring(table
,0,filp
,buffer
,lenp
, ppos
);
1475 down_write(&uts_sem
);
1476 r
=proc_dostring(table
,1,filp
,buffer
,lenp
, ppos
);
1482 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
1484 int write
, void *data
)
1487 *valp
= *negp
? -*lvalp
: *lvalp
;
1492 *lvalp
= (unsigned long)-val
;
1495 *lvalp
= (unsigned long)val
;
1501 static int do_proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1502 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
1503 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1504 int write
, void *data
),
1507 #define TMPBUFLEN 21
1508 int *i
, vleft
, first
=1, neg
, val
;
1512 char buf
[TMPBUFLEN
], *p
;
1513 char __user
*s
= buffer
;
1515 if (!table
->data
|| !table
->maxlen
|| !*lenp
||
1516 (*ppos
&& !write
)) {
1521 i
= (int *) table
->data
;
1522 vleft
= table
->maxlen
/ sizeof(*i
);
1526 conv
= do_proc_dointvec_conv
;
1528 for (; left
&& vleft
--; i
++, first
=0) {
1543 if (len
> sizeof(buf
) - 1)
1544 len
= sizeof(buf
) - 1;
1545 if (copy_from_user(buf
, s
, len
))
1549 if (*p
== '-' && left
> 1) {
1553 if (*p
< '0' || *p
> '9')
1556 lval
= simple_strtoul(p
, &p
, 0);
1559 if ((len
< left
) && *p
&& !isspace(*p
))
1566 if (conv(&neg
, &lval
, i
, 1, data
))
1573 if (conv(&neg
, &lval
, i
, 0, data
))
1576 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
1580 if(copy_to_user(s
, buf
, len
))
1587 if (!write
&& !first
&& left
) {
1588 if(put_user('\n', s
))
1595 if (get_user(c
, s
++))
1611 * proc_dointvec - read a vector of integers
1612 * @table: the sysctl table
1613 * @write: %TRUE if this is a write to the sysctl file
1614 * @filp: the file structure
1615 * @buffer: the user buffer
1616 * @lenp: the size of the user buffer
1617 * @ppos: file position
1619 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1620 * values from/to the user buffer, treated as an ASCII string.
1622 * Returns 0 on success.
1624 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1625 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1627 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1637 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
1639 int write
, void *data
)
1641 int op
= *(int *)data
;
1643 int val
= *negp
? -*lvalp
: *lvalp
;
1645 case OP_SET
: *valp
= val
; break;
1646 case OP_AND
: *valp
&= val
; break;
1647 case OP_OR
: *valp
|= val
; break;
1648 case OP_MAX
: if(*valp
< val
)
1651 case OP_MIN
: if(*valp
> val
)
1659 *lvalp
= (unsigned long)-val
;
1662 *lvalp
= (unsigned long)val
;
1669 * init may raise the set.
1672 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
1673 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1677 if (!capable(CAP_SYS_MODULE
)) {
1681 op
= (current
->pid
== 1) ? OP_SET
: OP_AND
;
1682 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1683 do_proc_dointvec_bset_conv
,&op
);
1686 struct do_proc_dointvec_minmax_conv_param
{
1691 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
1693 int write
, void *data
)
1695 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
1697 int val
= *negp
? -*lvalp
: *lvalp
;
1698 if ((param
->min
&& *param
->min
> val
) ||
1699 (param
->max
&& *param
->max
< val
))
1706 *lvalp
= (unsigned long)-val
;
1709 *lvalp
= (unsigned long)val
;
1716 * proc_dointvec_minmax - read a vector of integers with min/max values
1717 * @table: the sysctl table
1718 * @write: %TRUE if this is a write to the sysctl file
1719 * @filp: the file structure
1720 * @buffer: the user buffer
1721 * @lenp: the size of the user buffer
1722 * @ppos: file position
1724 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1725 * values from/to the user buffer, treated as an ASCII string.
1727 * This routine will ensure the values are within the range specified by
1728 * table->extra1 (min) and table->extra2 (max).
1730 * Returns 0 on success.
1732 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
1733 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1735 struct do_proc_dointvec_minmax_conv_param param
= {
1736 .min
= (int *) table
->extra1
,
1737 .max
= (int *) table
->extra2
,
1739 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
1740 do_proc_dointvec_minmax_conv
, ¶m
);
1743 static int do_proc_doulongvec_minmax(ctl_table
*table
, int write
,
1745 void __user
*buffer
,
1746 size_t *lenp
, loff_t
*ppos
,
1747 unsigned long convmul
,
1748 unsigned long convdiv
)
1750 #define TMPBUFLEN 21
1751 unsigned long *i
, *min
, *max
, val
;
1752 int vleft
, first
=1, neg
;
1754 char buf
[TMPBUFLEN
], *p
;
1755 char __user
*s
= buffer
;
1757 if (!table
->data
|| !table
->maxlen
|| !*lenp
||
1758 (*ppos
&& !write
)) {
1763 i
= (unsigned long *) table
->data
;
1764 min
= (unsigned long *) table
->extra1
;
1765 max
= (unsigned long *) table
->extra2
;
1766 vleft
= table
->maxlen
/ sizeof(unsigned long);
1769 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
1784 if (len
> TMPBUFLEN
-1)
1786 if (copy_from_user(buf
, s
, len
))
1790 if (*p
== '-' && left
> 1) {
1794 if (*p
< '0' || *p
> '9')
1796 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
1798 if ((len
< left
) && *p
&& !isspace(*p
))
1807 if ((min
&& val
< *min
) || (max
&& val
> *max
))
1814 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
1818 if(copy_to_user(s
, buf
, len
))
1825 if (!write
&& !first
&& left
) {
1826 if(put_user('\n', s
))
1833 if (get_user(c
, s
++))
1849 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1850 * @table: the sysctl table
1851 * @write: %TRUE if this is a write to the sysctl file
1852 * @filp: the file structure
1853 * @buffer: the user buffer
1854 * @lenp: the size of the user buffer
1855 * @ppos: file position
1857 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1858 * values from/to the user buffer, treated as an ASCII string.
1860 * This routine will ensure the values are within the range specified by
1861 * table->extra1 (min) and table->extra2 (max).
1863 * Returns 0 on success.
1865 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
1866 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1868 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
1872 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1873 * @table: the sysctl table
1874 * @write: %TRUE if this is a write to the sysctl file
1875 * @filp: the file structure
1876 * @buffer: the user buffer
1877 * @lenp: the size of the user buffer
1878 * @ppos: file position
1880 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1881 * values from/to the user buffer, treated as an ASCII string. The values
1882 * are treated as milliseconds, and converted to jiffies when they are stored.
1884 * This routine will ensure the values are within the range specified by
1885 * table->extra1 (min) and table->extra2 (max).
1887 * Returns 0 on success.
1889 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
1891 void __user
*buffer
,
1892 size_t *lenp
, loff_t
*ppos
)
1894 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
1895 lenp
, ppos
, HZ
, 1000l);
1899 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
1901 int write
, void *data
)
1904 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
1910 lval
= (unsigned long)-val
;
1913 lval
= (unsigned long)val
;
1920 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
1922 int write
, void *data
)
1925 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
1931 lval
= (unsigned long)-val
;
1934 lval
= (unsigned long)val
;
1936 *lvalp
= jiffies_to_clock_t(lval
);
1941 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
1943 int write
, void *data
)
1946 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
1952 lval
= (unsigned long)-val
;
1955 lval
= (unsigned long)val
;
1957 *lvalp
= jiffies_to_msecs(lval
);
1963 * proc_dointvec_jiffies - read a vector of integers as seconds
1964 * @table: the sysctl table
1965 * @write: %TRUE if this is a write to the sysctl file
1966 * @filp: the file structure
1967 * @buffer: the user buffer
1968 * @lenp: the size of the user buffer
1969 * @ppos: file position
1971 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1972 * values from/to the user buffer, treated as an ASCII string.
1973 * The values read are assumed to be in seconds, and are converted into
1976 * Returns 0 on success.
1978 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
1979 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1981 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1982 do_proc_dointvec_jiffies_conv
,NULL
);
1986 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1987 * @table: the sysctl table
1988 * @write: %TRUE if this is a write to the sysctl file
1989 * @filp: the file structure
1990 * @buffer: the user buffer
1991 * @lenp: the size of the user buffer
1993 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1994 * values from/to the user buffer, treated as an ASCII string.
1995 * The values read are assumed to be in 1/USER_HZ seconds, and
1996 * are converted into jiffies.
1998 * Returns 0 on success.
2000 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2001 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2003 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2004 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2008 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2009 * @table: the sysctl table
2010 * @write: %TRUE if this is a write to the sysctl file
2011 * @filp: the file structure
2012 * @buffer: the user buffer
2013 * @lenp: the size of the user buffer
2014 * @ppos: file position
2015 * @ppos: the current position in the file
2017 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2018 * values from/to the user buffer, treated as an ASCII string.
2019 * The values read are assumed to be in 1/1000 seconds, and
2020 * are converted into jiffies.
2022 * Returns 0 on success.
2024 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2025 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2027 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2028 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2031 #else /* CONFIG_PROC_FS */
2033 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
2034 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2039 static int proc_doutsstring(ctl_table
*table
, int write
, struct file
*filp
,
2040 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2045 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2046 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2051 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
2052 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2057 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2058 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2063 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2064 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2069 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2070 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2075 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2076 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2081 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2082 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2087 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2089 void __user
*buffer
,
2090 size_t *lenp
, loff_t
*ppos
)
2096 #endif /* CONFIG_PROC_FS */
2100 * General sysctl support routines
2103 /* The generic string strategy routine: */
2104 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2105 void __user
*oldval
, size_t __user
*oldlenp
,
2106 void __user
*newval
, size_t newlen
, void **context
)
2110 if (!table
->data
|| !table
->maxlen
)
2113 if (oldval
&& oldlenp
) {
2114 if (get_user(len
, oldlenp
))
2117 l
= strlen(table
->data
);
2118 if (len
> l
) len
= l
;
2119 if (len
>= table
->maxlen
)
2120 len
= table
->maxlen
;
2121 if(copy_to_user(oldval
, table
->data
, len
))
2123 if(put_user(0, ((char __user
*) oldval
) + len
))
2125 if(put_user(len
, oldlenp
))
2129 if (newval
&& newlen
) {
2131 if (len
> table
->maxlen
)
2132 len
= table
->maxlen
;
2133 if(copy_from_user(table
->data
, newval
, len
))
2135 if (len
== table
->maxlen
)
2137 ((char *) table
->data
)[len
] = 0;
2143 * This function makes sure that all of the integers in the vector
2144 * are between the minimum and maximum values given in the arrays
2145 * table->extra1 and table->extra2, respectively.
2147 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2148 void __user
*oldval
, size_t __user
*oldlenp
,
2149 void __user
*newval
, size_t newlen
, void **context
)
2152 if (newval
&& newlen
) {
2153 int __user
*vec
= (int __user
*) newval
;
2154 int *min
= (int *) table
->extra1
;
2155 int *max
= (int *) table
->extra2
;
2159 if (newlen
% sizeof(int) != 0)
2162 if (!table
->extra1
&& !table
->extra2
)
2165 if (newlen
> table
->maxlen
)
2166 newlen
= table
->maxlen
;
2167 length
= newlen
/ sizeof(int);
2169 for (i
= 0; i
< length
; i
++) {
2171 if (get_user(value
, vec
+ i
))
2173 if (min
&& value
< min
[i
])
2175 if (max
&& value
> max
[i
])
2182 /* Strategy function to convert jiffies to seconds */
2183 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2184 void __user
*oldval
, size_t __user
*oldlenp
,
2185 void __user
*newval
, size_t newlen
, void **context
)
2190 if (get_user(olen
, oldlenp
))
2192 if (olen
!=sizeof(int))
2195 if (put_user(*(int *)(table
->data
)/HZ
, (int __user
*)oldval
) ||
2196 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2199 if (newval
&& newlen
) {
2201 if (newlen
!= sizeof(int))
2203 if (get_user(new, (int __user
*)newval
))
2205 *(int *)(table
->data
) = new*HZ
;
2210 /* Strategy function to convert jiffies to seconds */
2211 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2212 void __user
*oldval
, size_t __user
*oldlenp
,
2213 void __user
*newval
, size_t newlen
, void **context
)
2218 if (get_user(olen
, oldlenp
))
2220 if (olen
!=sizeof(int))
2223 if (put_user(jiffies_to_msecs(*(int *)(table
->data
)), (int __user
*)oldval
) ||
2224 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2227 if (newval
&& newlen
) {
2229 if (newlen
!= sizeof(int))
2231 if (get_user(new, (int __user
*)newval
))
2233 *(int *)(table
->data
) = msecs_to_jiffies(new);
2238 #else /* CONFIG_SYSCTL */
2241 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2246 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2247 void __user
*oldval
, size_t __user
*oldlenp
,
2248 void __user
*newval
, size_t newlen
, void **context
)
2253 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2254 void __user
*oldval
, size_t __user
*oldlenp
,
2255 void __user
*newval
, size_t newlen
, void **context
)
2260 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2261 void __user
*oldval
, size_t __user
*oldlenp
,
2262 void __user
*newval
, size_t newlen
, void **context
)
2267 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2268 void __user
*oldval
, size_t __user
*oldlenp
,
2269 void __user
*newval
, size_t newlen
, void **context
)
2274 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
2275 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2280 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2281 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2286 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
2287 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2292 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2293 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2298 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2299 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2304 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2305 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2310 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2311 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2316 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2317 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2322 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2324 void __user
*buffer
,
2325 size_t *lenp
, loff_t
*ppos
)
2330 struct ctl_table_header
* register_sysctl_table(ctl_table
* table
,
2336 void unregister_sysctl_table(struct ctl_table_header
* table
)
2340 #endif /* CONFIG_SYSCTL */
2343 * No sense putting this after each symbol definition, twice,
2344 * exception granted :-)
2346 EXPORT_SYMBOL(proc_dointvec
);
2347 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2348 EXPORT_SYMBOL(proc_dointvec_minmax
);
2349 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2350 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2351 EXPORT_SYMBOL(proc_dostring
);
2352 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2353 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
2354 EXPORT_SYMBOL(register_sysctl_table
);
2355 EXPORT_SYMBOL(sysctl_intvec
);
2356 EXPORT_SYMBOL(sysctl_jiffies
);
2357 EXPORT_SYMBOL(sysctl_ms_jiffies
);
2358 EXPORT_SYMBOL(sysctl_string
);
2359 EXPORT_SYMBOL(unregister_sysctl_table
);