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
;
71 extern int inotify_max_user_devices
;
72 extern int inotify_max_user_watches
;
73 extern int inotify_max_queued_events
;
76 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
77 int unknown_nmi_panic
;
78 extern int proc_unknown_nmi_panic(ctl_table
*, int, struct file
*,
79 void __user
*, size_t *, loff_t
*);
82 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
83 static int maxolduid
= 65535;
86 static int ngroups_max
= NGROUPS_MAX
;
89 extern char modprobe_path
[];
92 extern char hotplug_path
[];
94 #ifdef CONFIG_CHR_DEV_SG
95 extern int sg_big_buff
;
98 extern size_t shm_ctlmax
;
99 extern size_t shm_ctlall
;
100 extern int shm_ctlmni
;
101 extern int msg_ctlmax
;
102 extern int msg_ctlmnb
;
103 extern int msg_ctlmni
;
104 extern int sem_ctls
[];
108 extern char reboot_command
[];
109 extern int stop_a_enabled
;
110 extern int scons_pwroff
;
114 extern int pwrsw_enabled
;
115 extern int unaligned_enabled
;
118 #ifdef CONFIG_ARCH_S390
119 #ifdef CONFIG_MATHEMU
120 extern int sysctl_ieee_emulation_warnings
;
122 extern int sysctl_userprocess_debug
;
125 extern int sysctl_hz_timer
;
127 #ifdef CONFIG_BSD_PROCESS_ACCT
128 extern int acct_parm
[];
131 int randomize_va_space
= 1;
133 static int parse_table(int __user
*, int, void __user
*, size_t __user
*, void __user
*, size_t,
134 ctl_table
*, void **);
135 static int proc_doutsstring(ctl_table
*table
, int write
, struct file
*filp
,
136 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
138 static ctl_table root_table
[];
139 static struct ctl_table_header root_table_header
=
140 { root_table
, LIST_HEAD_INIT(root_table_header
.ctl_entry
) };
142 static ctl_table kern_table
[];
143 static ctl_table vm_table
[];
145 extern ctl_table net_table
[];
147 static ctl_table proc_table
[];
148 static ctl_table fs_table
[];
149 static ctl_table debug_table
[];
150 static ctl_table dev_table
[];
151 extern ctl_table random_table
[];
152 #ifdef CONFIG_UNIX98_PTYS
153 extern ctl_table pty_table
[];
156 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
157 int sysctl_legacy_va_layout
;
160 /* /proc declarations: */
162 #ifdef CONFIG_PROC_FS
164 static ssize_t
proc_readsys(struct file
*, char __user
*, size_t, loff_t
*);
165 static ssize_t
proc_writesys(struct file
*, const char __user
*, size_t, loff_t
*);
166 static int proc_opensys(struct inode
*, struct file
*);
168 struct file_operations proc_sys_file_operations
= {
169 .open
= proc_opensys
,
170 .read
= proc_readsys
,
171 .write
= proc_writesys
,
174 extern struct proc_dir_entry
*proc_sys_root
;
176 static void register_proc_table(ctl_table
*, struct proc_dir_entry
*);
177 static void unregister_proc_table(ctl_table
*, struct proc_dir_entry
*);
180 /* The default sysctl tables: */
182 static ctl_table root_table
[] = {
184 .ctl_name
= CTL_KERN
,
185 .procname
= "kernel",
204 .ctl_name
= CTL_PROC
,
216 .ctl_name
= CTL_DEBUG
,
219 .child
= debug_table
,
231 static ctl_table kern_table
[] = {
233 .ctl_name
= KERN_OSTYPE
,
234 .procname
= "ostype",
235 .data
= system_utsname
.sysname
,
236 .maxlen
= sizeof(system_utsname
.sysname
),
238 .proc_handler
= &proc_doutsstring
,
239 .strategy
= &sysctl_string
,
242 .ctl_name
= KERN_OSRELEASE
,
243 .procname
= "osrelease",
244 .data
= system_utsname
.release
,
245 .maxlen
= sizeof(system_utsname
.release
),
247 .proc_handler
= &proc_doutsstring
,
248 .strategy
= &sysctl_string
,
251 .ctl_name
= KERN_VERSION
,
252 .procname
= "version",
253 .data
= system_utsname
.version
,
254 .maxlen
= sizeof(system_utsname
.version
),
256 .proc_handler
= &proc_doutsstring
,
257 .strategy
= &sysctl_string
,
260 .ctl_name
= KERN_NODENAME
,
261 .procname
= "hostname",
262 .data
= system_utsname
.nodename
,
263 .maxlen
= sizeof(system_utsname
.nodename
),
265 .proc_handler
= &proc_doutsstring
,
266 .strategy
= &sysctl_string
,
269 .ctl_name
= KERN_DOMAINNAME
,
270 .procname
= "domainname",
271 .data
= system_utsname
.domainname
,
272 .maxlen
= sizeof(system_utsname
.domainname
),
274 .proc_handler
= &proc_doutsstring
,
275 .strategy
= &sysctl_string
,
278 .ctl_name
= KERN_PANIC
,
280 .data
= &panic_timeout
,
281 .maxlen
= sizeof(int),
283 .proc_handler
= &proc_dointvec
,
286 .ctl_name
= KERN_CORE_USES_PID
,
287 .procname
= "core_uses_pid",
288 .data
= &core_uses_pid
,
289 .maxlen
= sizeof(int),
291 .proc_handler
= &proc_dointvec
,
294 .ctl_name
= KERN_CORE_PATTERN
,
295 .procname
= "core_pattern",
296 .data
= core_pattern
,
299 .proc_handler
= &proc_dostring
,
300 .strategy
= &sysctl_string
,
303 .ctl_name
= KERN_TAINTED
,
304 .procname
= "tainted",
306 .maxlen
= sizeof(int),
308 .proc_handler
= &proc_dointvec
,
311 .ctl_name
= KERN_CAP_BSET
,
312 .procname
= "cap-bound",
314 .maxlen
= sizeof(kernel_cap_t
),
316 .proc_handler
= &proc_dointvec_bset
,
318 #ifdef CONFIG_BLK_DEV_INITRD
320 .ctl_name
= KERN_REALROOTDEV
,
321 .procname
= "real-root-dev",
322 .data
= &real_root_dev
,
323 .maxlen
= sizeof(int),
325 .proc_handler
= &proc_dointvec
,
330 .ctl_name
= KERN_SPARC_REBOOT
,
331 .procname
= "reboot-cmd",
332 .data
= reboot_command
,
335 .proc_handler
= &proc_dostring
,
336 .strategy
= &sysctl_string
,
339 .ctl_name
= KERN_SPARC_STOP_A
,
340 .procname
= "stop-a",
341 .data
= &stop_a_enabled
,
342 .maxlen
= sizeof (int),
344 .proc_handler
= &proc_dointvec
,
347 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
348 .procname
= "scons-poweroff",
349 .data
= &scons_pwroff
,
350 .maxlen
= sizeof (int),
352 .proc_handler
= &proc_dointvec
,
357 .ctl_name
= KERN_HPPA_PWRSW
,
358 .procname
= "soft-power",
359 .data
= &pwrsw_enabled
,
360 .maxlen
= sizeof (int),
362 .proc_handler
= &proc_dointvec
,
365 .ctl_name
= KERN_HPPA_UNALIGNED
,
366 .procname
= "unaligned-trap",
367 .data
= &unaligned_enabled
,
368 .maxlen
= sizeof (int),
370 .proc_handler
= &proc_dointvec
,
374 .ctl_name
= KERN_CTLALTDEL
,
375 .procname
= "ctrl-alt-del",
377 .maxlen
= sizeof(int),
379 .proc_handler
= &proc_dointvec
,
382 .ctl_name
= KERN_PRINTK
,
383 .procname
= "printk",
384 .data
= &console_loglevel
,
385 .maxlen
= 4*sizeof(int),
387 .proc_handler
= &proc_dointvec
,
391 .ctl_name
= KERN_MODPROBE
,
392 .procname
= "modprobe",
393 .data
= &modprobe_path
,
394 .maxlen
= KMOD_PATH_LEN
,
396 .proc_handler
= &proc_dostring
,
397 .strategy
= &sysctl_string
,
400 #ifdef CONFIG_HOTPLUG
402 .ctl_name
= KERN_HOTPLUG
,
403 .procname
= "hotplug",
404 .data
= &hotplug_path
,
405 .maxlen
= HOTPLUG_PATH_LEN
,
407 .proc_handler
= &proc_dostring
,
408 .strategy
= &sysctl_string
,
411 #ifdef CONFIG_CHR_DEV_SG
413 .ctl_name
= KERN_SG_BIG_BUFF
,
414 .procname
= "sg-big-buff",
415 .data
= &sg_big_buff
,
416 .maxlen
= sizeof (int),
418 .proc_handler
= &proc_dointvec
,
421 #ifdef CONFIG_BSD_PROCESS_ACCT
423 .ctl_name
= KERN_ACCT
,
426 .maxlen
= 3*sizeof(int),
428 .proc_handler
= &proc_dointvec
,
431 #ifdef CONFIG_SYSVIPC
433 .ctl_name
= KERN_SHMMAX
,
434 .procname
= "shmmax",
436 .maxlen
= sizeof (size_t),
438 .proc_handler
= &proc_doulongvec_minmax
,
441 .ctl_name
= KERN_SHMALL
,
442 .procname
= "shmall",
444 .maxlen
= sizeof (size_t),
446 .proc_handler
= &proc_doulongvec_minmax
,
449 .ctl_name
= KERN_SHMMNI
,
450 .procname
= "shmmni",
452 .maxlen
= sizeof (int),
454 .proc_handler
= &proc_dointvec
,
457 .ctl_name
= KERN_MSGMAX
,
458 .procname
= "msgmax",
460 .maxlen
= sizeof (int),
462 .proc_handler
= &proc_dointvec
,
465 .ctl_name
= KERN_MSGMNI
,
466 .procname
= "msgmni",
468 .maxlen
= sizeof (int),
470 .proc_handler
= &proc_dointvec
,
473 .ctl_name
= KERN_MSGMNB
,
474 .procname
= "msgmnb",
476 .maxlen
= sizeof (int),
478 .proc_handler
= &proc_dointvec
,
481 .ctl_name
= KERN_SEM
,
484 .maxlen
= 4*sizeof (int),
486 .proc_handler
= &proc_dointvec
,
489 #ifdef CONFIG_MAGIC_SYSRQ
491 .ctl_name
= KERN_SYSRQ
,
493 .data
= &sysrq_enabled
,
494 .maxlen
= sizeof (int),
496 .proc_handler
= &proc_dointvec
,
500 .ctl_name
= KERN_CADPID
,
501 .procname
= "cad_pid",
503 .maxlen
= sizeof (int),
505 .proc_handler
= &proc_dointvec
,
508 .ctl_name
= KERN_MAX_THREADS
,
509 .procname
= "threads-max",
510 .data
= &max_threads
,
511 .maxlen
= sizeof(int),
513 .proc_handler
= &proc_dointvec
,
516 .ctl_name
= KERN_RANDOM
,
517 .procname
= "random",
519 .child
= random_table
,
521 #ifdef CONFIG_UNIX98_PTYS
523 .ctl_name
= KERN_PTY
,
530 .ctl_name
= KERN_OVERFLOWUID
,
531 .procname
= "overflowuid",
532 .data
= &overflowuid
,
533 .maxlen
= sizeof(int),
535 .proc_handler
= &proc_dointvec_minmax
,
536 .strategy
= &sysctl_intvec
,
537 .extra1
= &minolduid
,
538 .extra2
= &maxolduid
,
541 .ctl_name
= KERN_OVERFLOWGID
,
542 .procname
= "overflowgid",
543 .data
= &overflowgid
,
544 .maxlen
= sizeof(int),
546 .proc_handler
= &proc_dointvec_minmax
,
547 .strategy
= &sysctl_intvec
,
548 .extra1
= &minolduid
,
549 .extra2
= &maxolduid
,
551 #ifdef CONFIG_ARCH_S390
552 #ifdef CONFIG_MATHEMU
554 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
555 .procname
= "ieee_emulation_warnings",
556 .data
= &sysctl_ieee_emulation_warnings
,
557 .maxlen
= sizeof(int),
559 .proc_handler
= &proc_dointvec
,
562 #ifdef CONFIG_NO_IDLE_HZ
564 .ctl_name
= KERN_HZ_TIMER
,
565 .procname
= "hz_timer",
566 .data
= &sysctl_hz_timer
,
567 .maxlen
= sizeof(int),
569 .proc_handler
= &proc_dointvec
,
573 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
574 .procname
= "userprocess_debug",
575 .data
= &sysctl_userprocess_debug
,
576 .maxlen
= sizeof(int),
578 .proc_handler
= &proc_dointvec
,
582 .ctl_name
= KERN_PIDMAX
,
583 .procname
= "pid_max",
585 .maxlen
= sizeof (int),
587 .proc_handler
= &proc_dointvec_minmax
,
588 .strategy
= sysctl_intvec
,
589 .extra1
= &pid_max_min
,
590 .extra2
= &pid_max_max
,
593 .ctl_name
= KERN_PANIC_ON_OOPS
,
594 .procname
= "panic_on_oops",
595 .data
= &panic_on_oops
,
596 .maxlen
= sizeof(int),
598 .proc_handler
= &proc_dointvec
,
601 .ctl_name
= KERN_PRINTK_RATELIMIT
,
602 .procname
= "printk_ratelimit",
603 .data
= &printk_ratelimit_jiffies
,
604 .maxlen
= sizeof(int),
606 .proc_handler
= &proc_dointvec_jiffies
,
607 .strategy
= &sysctl_jiffies
,
610 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
611 .procname
= "printk_ratelimit_burst",
612 .data
= &printk_ratelimit_burst
,
613 .maxlen
= sizeof(int),
615 .proc_handler
= &proc_dointvec
,
618 .ctl_name
= KERN_NGROUPS_MAX
,
619 .procname
= "ngroups_max",
620 .data
= &ngroups_max
,
621 .maxlen
= sizeof (int),
623 .proc_handler
= &proc_dointvec
,
625 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
627 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
628 .procname
= "unknown_nmi_panic",
629 .data
= &unknown_nmi_panic
,
630 .maxlen
= sizeof (int),
632 .proc_handler
= &proc_unknown_nmi_panic
,
635 #if defined(CONFIG_X86)
637 .ctl_name
= KERN_BOOTLOADER_TYPE
,
638 .procname
= "bootloader_type",
639 .data
= &bootloader_type
,
640 .maxlen
= sizeof (int),
642 .proc_handler
= &proc_dointvec
,
646 .ctl_name
= KERN_RANDOMIZE
,
647 .procname
= "randomize_va_space",
648 .data
= &randomize_va_space
,
649 .maxlen
= sizeof(int),
651 .proc_handler
= &proc_dointvec
,
657 /* Constants for minimum and maximum testing in vm_table.
658 We use these as one-element integer vectors. */
660 static int one_hundred
= 100;
663 static ctl_table vm_table
[] = {
665 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
666 .procname
= "overcommit_memory",
667 .data
= &sysctl_overcommit_memory
,
668 .maxlen
= sizeof(sysctl_overcommit_memory
),
670 .proc_handler
= &proc_dointvec
,
673 .ctl_name
= VM_OVERCOMMIT_RATIO
,
674 .procname
= "overcommit_ratio",
675 .data
= &sysctl_overcommit_ratio
,
676 .maxlen
= sizeof(sysctl_overcommit_ratio
),
678 .proc_handler
= &proc_dointvec
,
681 .ctl_name
= VM_PAGE_CLUSTER
,
682 .procname
= "page-cluster",
683 .data
= &page_cluster
,
684 .maxlen
= sizeof(int),
686 .proc_handler
= &proc_dointvec
,
689 .ctl_name
= VM_DIRTY_BACKGROUND
,
690 .procname
= "dirty_background_ratio",
691 .data
= &dirty_background_ratio
,
692 .maxlen
= sizeof(dirty_background_ratio
),
694 .proc_handler
= &proc_dointvec_minmax
,
695 .strategy
= &sysctl_intvec
,
697 .extra2
= &one_hundred
,
700 .ctl_name
= VM_DIRTY_RATIO
,
701 .procname
= "dirty_ratio",
702 .data
= &vm_dirty_ratio
,
703 .maxlen
= sizeof(vm_dirty_ratio
),
705 .proc_handler
= &proc_dointvec_minmax
,
706 .strategy
= &sysctl_intvec
,
708 .extra2
= &one_hundred
,
711 .ctl_name
= VM_DIRTY_WB_CS
,
712 .procname
= "dirty_writeback_centisecs",
713 .data
= &dirty_writeback_centisecs
,
714 .maxlen
= sizeof(dirty_writeback_centisecs
),
716 .proc_handler
= &dirty_writeback_centisecs_handler
,
719 .ctl_name
= VM_DIRTY_EXPIRE_CS
,
720 .procname
= "dirty_expire_centisecs",
721 .data
= &dirty_expire_centisecs
,
722 .maxlen
= sizeof(dirty_expire_centisecs
),
724 .proc_handler
= &proc_dointvec
,
727 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
728 .procname
= "nr_pdflush_threads",
729 .data
= &nr_pdflush_threads
,
730 .maxlen
= sizeof nr_pdflush_threads
,
731 .mode
= 0444 /* read-only*/,
732 .proc_handler
= &proc_dointvec
,
735 .ctl_name
= VM_SWAPPINESS
,
736 .procname
= "swappiness",
737 .data
= &vm_swappiness
,
738 .maxlen
= sizeof(vm_swappiness
),
740 .proc_handler
= &proc_dointvec_minmax
,
741 .strategy
= &sysctl_intvec
,
743 .extra2
= &one_hundred
,
745 #ifdef CONFIG_HUGETLB_PAGE
747 .ctl_name
= VM_HUGETLB_PAGES
,
748 .procname
= "nr_hugepages",
749 .data
= &max_huge_pages
,
750 .maxlen
= sizeof(unsigned long),
752 .proc_handler
= &hugetlb_sysctl_handler
,
753 .extra1
= (void *)&hugetlb_zero
,
754 .extra2
= (void *)&hugetlb_infinity
,
757 .ctl_name
= VM_HUGETLB_GROUP
,
758 .procname
= "hugetlb_shm_group",
759 .data
= &sysctl_hugetlb_shm_group
,
760 .maxlen
= sizeof(gid_t
),
762 .proc_handler
= &proc_dointvec
,
766 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
767 .procname
= "lowmem_reserve_ratio",
768 .data
= &sysctl_lowmem_reserve_ratio
,
769 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
771 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
772 .strategy
= &sysctl_intvec
,
775 .ctl_name
= VM_MIN_FREE_KBYTES
,
776 .procname
= "min_free_kbytes",
777 .data
= &min_free_kbytes
,
778 .maxlen
= sizeof(min_free_kbytes
),
780 .proc_handler
= &min_free_kbytes_sysctl_handler
,
781 .strategy
= &sysctl_intvec
,
786 .ctl_name
= VM_MAX_MAP_COUNT
,
787 .procname
= "max_map_count",
788 .data
= &sysctl_max_map_count
,
789 .maxlen
= sizeof(sysctl_max_map_count
),
791 .proc_handler
= &proc_dointvec
795 .ctl_name
= VM_LAPTOP_MODE
,
796 .procname
= "laptop_mode",
797 .data
= &laptop_mode
,
798 .maxlen
= sizeof(laptop_mode
),
800 .proc_handler
= &proc_dointvec
,
801 .strategy
= &sysctl_intvec
,
805 .ctl_name
= VM_BLOCK_DUMP
,
806 .procname
= "block_dump",
808 .maxlen
= sizeof(block_dump
),
810 .proc_handler
= &proc_dointvec
,
811 .strategy
= &sysctl_intvec
,
815 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
816 .procname
= "vfs_cache_pressure",
817 .data
= &sysctl_vfs_cache_pressure
,
818 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
820 .proc_handler
= &proc_dointvec
,
821 .strategy
= &sysctl_intvec
,
824 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
826 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
827 .procname
= "legacy_va_layout",
828 .data
= &sysctl_legacy_va_layout
,
829 .maxlen
= sizeof(sysctl_legacy_va_layout
),
831 .proc_handler
= &proc_dointvec
,
832 .strategy
= &sysctl_intvec
,
838 .ctl_name
= VM_SWAP_TOKEN_TIMEOUT
,
839 .procname
= "swap_token_timeout",
840 .data
= &swap_token_default_timeout
,
841 .maxlen
= sizeof(swap_token_default_timeout
),
843 .proc_handler
= &proc_dointvec_jiffies
,
844 .strategy
= &sysctl_jiffies
,
850 static ctl_table proc_table
[] = {
854 static ctl_table fs_table
[] = {
856 .ctl_name
= FS_NRINODE
,
857 .procname
= "inode-nr",
858 .data
= &inodes_stat
,
859 .maxlen
= 2*sizeof(int),
861 .proc_handler
= &proc_dointvec
,
864 .ctl_name
= FS_STATINODE
,
865 .procname
= "inode-state",
866 .data
= &inodes_stat
,
867 .maxlen
= 7*sizeof(int),
869 .proc_handler
= &proc_dointvec
,
872 .ctl_name
= FS_NRFILE
,
873 .procname
= "file-nr",
875 .maxlen
= 3*sizeof(int),
877 .proc_handler
= &proc_dointvec
,
880 .ctl_name
= FS_MAXFILE
,
881 .procname
= "file-max",
882 .data
= &files_stat
.max_files
,
883 .maxlen
= sizeof(int),
885 .proc_handler
= &proc_dointvec
,
888 .ctl_name
= FS_DENTRY
,
889 .procname
= "dentry-state",
890 .data
= &dentry_stat
,
891 .maxlen
= 6*sizeof(int),
893 .proc_handler
= &proc_dointvec
,
896 .ctl_name
= FS_OVERFLOWUID
,
897 .procname
= "overflowuid",
898 .data
= &fs_overflowuid
,
899 .maxlen
= sizeof(int),
901 .proc_handler
= &proc_dointvec_minmax
,
902 .strategy
= &sysctl_intvec
,
903 .extra1
= &minolduid
,
904 .extra2
= &maxolduid
,
907 .ctl_name
= FS_OVERFLOWGID
,
908 .procname
= "overflowgid",
909 .data
= &fs_overflowgid
,
910 .maxlen
= sizeof(int),
912 .proc_handler
= &proc_dointvec_minmax
,
913 .strategy
= &sysctl_intvec
,
914 .extra1
= &minolduid
,
915 .extra2
= &maxolduid
,
918 .ctl_name
= FS_LEASES
,
919 .procname
= "leases-enable",
920 .data
= &leases_enable
,
921 .maxlen
= sizeof(int),
923 .proc_handler
= &proc_dointvec
,
925 #ifdef CONFIG_DNOTIFY
927 .ctl_name
= FS_DIR_NOTIFY
,
928 .procname
= "dir-notify-enable",
929 .data
= &dir_notify_enable
,
930 .maxlen
= sizeof(int),
932 .proc_handler
= &proc_dointvec
,
937 .ctl_name
= FS_LEASE_TIME
,
938 .procname
= "lease-break-time",
939 .data
= &lease_break_time
,
940 .maxlen
= sizeof(int),
942 .proc_handler
= &proc_dointvec
,
945 .ctl_name
= FS_AIO_NR
,
946 .procname
= "aio-nr",
948 .maxlen
= sizeof(aio_nr
),
950 .proc_handler
= &proc_dointvec
,
953 .ctl_name
= FS_AIO_MAX_NR
,
954 .procname
= "aio-max-nr",
956 .maxlen
= sizeof(aio_max_nr
),
958 .proc_handler
= &proc_dointvec
,
962 .ctl_name
= KERN_SETUID_DUMPABLE
,
963 .procname
= "suid_dumpable",
964 .data
= &suid_dumpable
,
965 .maxlen
= sizeof(int),
967 .proc_handler
= &proc_dointvec
,
969 #ifdef CONFIG_INOTIFY
971 .ctl_name
= INOTIFY_MAX_USER_DEVICES
,
972 .procname
= "max_user_devices",
973 .data
= &inotify_max_user_devices
,
974 .maxlen
= sizeof(int),
976 .proc_handler
= &proc_dointvec_minmax
,
977 .strategy
= &sysctl_intvec
,
982 .ctl_name
= INOTIFY_MAX_USER_WATCHES
,
983 .procname
= "max_user_watches",
984 .data
= &inotify_max_user_watches
,
985 .maxlen
= sizeof(int),
987 .proc_handler
= &proc_dointvec_minmax
,
988 .strategy
= &sysctl_intvec
,
993 .ctl_name
= INOTIFY_MAX_QUEUED_EVENTS
,
994 .procname
= "max_queued_events",
995 .data
= &inotify_max_queued_events
,
996 .maxlen
= sizeof(int),
998 .proc_handler
= &proc_dointvec_minmax
,
999 .strategy
= &sysctl_intvec
,
1006 static ctl_table debug_table
[] = {
1010 static ctl_table dev_table
[] = {
1014 extern void init_irq_proc (void);
1016 void __init
sysctl_init(void)
1018 #ifdef CONFIG_PROC_FS
1019 register_proc_table(root_table
, proc_sys_root
);
1024 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1025 void __user
*newval
, size_t newlen
)
1027 struct list_head
*tmp
;
1029 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1033 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1036 tmp
= &root_table_header
.ctl_entry
;
1038 struct ctl_table_header
*head
=
1039 list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1040 void *context
= NULL
;
1041 int error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1042 newval
, newlen
, head
->ctl_table
,
1045 if (error
!= -ENOTDIR
)
1048 } while (tmp
!= &root_table_header
.ctl_entry
);
1052 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1054 struct __sysctl_args tmp
;
1057 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1061 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1062 tmp
.newval
, tmp
.newlen
);
1068 * ctl_perm does NOT grant the superuser all rights automatically, because
1069 * some sysctl variables are readonly even to root.
1072 static int test_perm(int mode
, int op
)
1076 else if (in_egroup_p(0))
1078 if ((mode
& op
& 0007) == op
)
1083 static inline int ctl_perm(ctl_table
*table
, int op
)
1086 error
= security_sysctl(table
, op
);
1089 return test_perm(table
->mode
, op
);
1092 static int parse_table(int __user
*name
, int nlen
,
1093 void __user
*oldval
, size_t __user
*oldlenp
,
1094 void __user
*newval
, size_t newlen
,
1095 ctl_table
*table
, void **context
)
1101 if (get_user(n
, name
))
1103 for ( ; table
->ctl_name
; table
++) {
1104 if (n
== table
->ctl_name
|| table
->ctl_name
== CTL_ANY
) {
1107 if (ctl_perm(table
, 001))
1109 if (table
->strategy
) {
1110 error
= table
->strategy(
1113 newval
, newlen
, context
);
1119 table
= table
->child
;
1122 error
= do_sysctl_strategy(table
, name
, nlen
,
1124 newval
, newlen
, context
);
1131 /* Perform the actual read/write of a sysctl table entry. */
1132 int do_sysctl_strategy (ctl_table
*table
,
1133 int __user
*name
, int nlen
,
1134 void __user
*oldval
, size_t __user
*oldlenp
,
1135 void __user
*newval
, size_t newlen
, void **context
)
1144 if (ctl_perm(table
, op
))
1147 if (table
->strategy
) {
1148 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1149 newval
, newlen
, context
);
1156 /* If there is no strategy routine, or if the strategy returns
1157 * zero, proceed with automatic r/w */
1158 if (table
->data
&& table
->maxlen
) {
1159 if (oldval
&& oldlenp
) {
1160 if (get_user(len
, oldlenp
))
1163 if (len
> table
->maxlen
)
1164 len
= table
->maxlen
;
1165 if(copy_to_user(oldval
, table
->data
, len
))
1167 if(put_user(len
, oldlenp
))
1171 if (newval
&& newlen
) {
1173 if (len
> table
->maxlen
)
1174 len
= table
->maxlen
;
1175 if(copy_from_user(table
->data
, newval
, len
))
1183 * register_sysctl_table - register a sysctl hierarchy
1184 * @table: the top-level table structure
1185 * @insert_at_head: whether the entry should be inserted in front or at the end
1187 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1188 * array. An entry with a ctl_name of 0 terminates the table.
1190 * The members of the &ctl_table structure are used as follows:
1192 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1193 * must be unique within that level of sysctl
1195 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1196 * enter a sysctl file
1198 * data - a pointer to data for use by proc_handler
1200 * maxlen - the maximum size in bytes of the data
1202 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1204 * child - a pointer to the child sysctl table if this entry is a directory, or
1207 * proc_handler - the text handler routine (described below)
1209 * strategy - the strategy routine (described below)
1211 * de - for internal use by the sysctl routines
1213 * extra1, extra2 - extra pointers usable by the proc handler routines
1215 * Leaf nodes in the sysctl tree will be represented by a single file
1216 * under /proc; non-leaf nodes will be represented by directories.
1218 * sysctl(2) can automatically manage read and write requests through
1219 * the sysctl table. The data and maxlen fields of the ctl_table
1220 * struct enable minimal validation of the values being written to be
1221 * performed, and the mode field allows minimal authentication.
1223 * More sophisticated management can be enabled by the provision of a
1224 * strategy routine with the table entry. This will be called before
1225 * any automatic read or write of the data is performed.
1227 * The strategy routine may return
1229 * < 0 - Error occurred (error is passed to user process)
1231 * 0 - OK - proceed with automatic read or write.
1233 * > 0 - OK - read or write has been done by the strategy routine, so
1234 * return immediately.
1236 * There must be a proc_handler routine for any terminal nodes
1237 * mirrored under /proc/sys (non-terminals are handled by a built-in
1238 * directory handler). Several default handlers are available to
1239 * cover common cases -
1241 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1242 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1243 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1245 * It is the handler's job to read the input buffer from user memory
1246 * and process it. The handler should return 0 on success.
1248 * This routine returns %NULL on a failure to register, and a pointer
1249 * to the table header on success.
1251 struct ctl_table_header
*register_sysctl_table(ctl_table
* table
,
1254 struct ctl_table_header
*tmp
;
1255 tmp
= kmalloc(sizeof(struct ctl_table_header
), GFP_KERNEL
);
1258 tmp
->ctl_table
= table
;
1259 INIT_LIST_HEAD(&tmp
->ctl_entry
);
1261 list_add(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1263 list_add_tail(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1264 #ifdef CONFIG_PROC_FS
1265 register_proc_table(table
, proc_sys_root
);
1271 * unregister_sysctl_table - unregister a sysctl table hierarchy
1272 * @header: the header returned from register_sysctl_table
1274 * Unregisters the sysctl table and all children. proc entries may not
1275 * actually be removed until they are no longer used by anyone.
1277 void unregister_sysctl_table(struct ctl_table_header
* header
)
1279 list_del(&header
->ctl_entry
);
1280 #ifdef CONFIG_PROC_FS
1281 unregister_proc_table(header
->ctl_table
, proc_sys_root
);
1290 #ifdef CONFIG_PROC_FS
1292 /* Scan the sysctl entries in table and add them all into /proc */
1293 static void register_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
)
1295 struct proc_dir_entry
*de
;
1299 for (; table
->ctl_name
; table
++) {
1300 /* Can't do anything without a proc name. */
1301 if (!table
->procname
)
1303 /* Maybe we can't do anything with it... */
1304 if (!table
->proc_handler
&& !table
->child
) {
1305 printk(KERN_WARNING
"SYSCTL: Can't register %s\n",
1310 len
= strlen(table
->procname
);
1314 if (table
->proc_handler
)
1318 for (de
= root
->subdir
; de
; de
= de
->next
) {
1319 if (proc_match(len
, table
->procname
, de
))
1322 /* If the subdir exists already, de is non-NULL */
1326 de
= create_proc_entry(table
->procname
, mode
, root
);
1329 de
->data
= (void *) table
;
1330 if (table
->proc_handler
)
1331 de
->proc_fops
= &proc_sys_file_operations
;
1334 if (de
->mode
& S_IFDIR
)
1335 register_proc_table(table
->child
, de
);
1340 * Unregister a /proc sysctl table and any subdirectories.
1342 static void unregister_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
)
1344 struct proc_dir_entry
*de
;
1345 for (; table
->ctl_name
; table
++) {
1346 if (!(de
= table
->de
))
1348 if (de
->mode
& S_IFDIR
) {
1349 if (!table
->child
) {
1350 printk (KERN_ALERT
"Help - malformed sysctl tree on free\n");
1353 unregister_proc_table(table
->child
, de
);
1355 /* Don't unregister directories which still have entries.. */
1360 /* Don't unregister proc entries that are still being used.. */
1361 if (atomic_read(&de
->count
))
1365 remove_proc_entry(table
->procname
, root
);
1369 static ssize_t
do_rw_proc(int write
, struct file
* file
, char __user
* buf
,
1370 size_t count
, loff_t
*ppos
)
1373 struct proc_dir_entry
*de
;
1374 struct ctl_table
*table
;
1378 de
= PDE(file
->f_dentry
->d_inode
);
1379 if (!de
|| !de
->data
)
1381 table
= (struct ctl_table
*) de
->data
;
1382 if (!table
|| !table
->proc_handler
)
1384 op
= (write
? 002 : 004);
1385 if (ctl_perm(table
, op
))
1390 error
= (*table
->proc_handler
) (table
, write
, file
, buf
, &res
, ppos
);
1396 static int proc_opensys(struct inode
*inode
, struct file
*file
)
1398 if (file
->f_mode
& FMODE_WRITE
) {
1400 * sysctl entries that are not writable,
1401 * are _NOT_ writable, capabilities or not.
1403 if (!(inode
->i_mode
& S_IWUSR
))
1410 static ssize_t
proc_readsys(struct file
* file
, char __user
* buf
,
1411 size_t count
, loff_t
*ppos
)
1413 return do_rw_proc(0, file
, buf
, count
, ppos
);
1416 static ssize_t
proc_writesys(struct file
* file
, const char __user
* buf
,
1417 size_t count
, loff_t
*ppos
)
1419 return do_rw_proc(1, file
, (char __user
*) buf
, count
, ppos
);
1423 * proc_dostring - read a string sysctl
1424 * @table: the sysctl table
1425 * @write: %TRUE if this is a write to the sysctl file
1426 * @filp: the file structure
1427 * @buffer: the user buffer
1428 * @lenp: the size of the user buffer
1429 * @ppos: file position
1431 * Reads/writes a string from/to the user buffer. If the kernel
1432 * buffer provided is not large enough to hold the string, the
1433 * string is truncated. The copied string is %NULL-terminated.
1434 * If the string is being read by the user process, it is copied
1435 * and a newline '\n' is added. It is truncated if the buffer is
1438 * Returns 0 on success.
1440 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
1441 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1447 if (!table
->data
|| !table
->maxlen
|| !*lenp
||
1448 (*ppos
&& !write
)) {
1456 while (len
< *lenp
) {
1457 if (get_user(c
, p
++))
1459 if (c
== 0 || c
== '\n')
1463 if (len
>= table
->maxlen
)
1464 len
= table
->maxlen
-1;
1465 if(copy_from_user(table
->data
, buffer
, len
))
1467 ((char *) table
->data
)[len
] = 0;
1470 len
= strlen(table
->data
);
1471 if (len
> table
->maxlen
)
1472 len
= table
->maxlen
;
1476 if(copy_to_user(buffer
, table
->data
, len
))
1479 if(put_user('\n', ((char __user
*) buffer
) + len
))
1490 * Special case of dostring for the UTS structure. This has locks
1491 * to observe. Should this be in kernel/sys.c ????
1494 static int proc_doutsstring(ctl_table
*table
, int write
, struct file
*filp
,
1495 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1500 down_read(&uts_sem
);
1501 r
=proc_dostring(table
,0,filp
,buffer
,lenp
, ppos
);
1504 down_write(&uts_sem
);
1505 r
=proc_dostring(table
,1,filp
,buffer
,lenp
, ppos
);
1511 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
1513 int write
, void *data
)
1516 *valp
= *negp
? -*lvalp
: *lvalp
;
1521 *lvalp
= (unsigned long)-val
;
1524 *lvalp
= (unsigned long)val
;
1530 static int do_proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1531 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
1532 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1533 int write
, void *data
),
1536 #define TMPBUFLEN 21
1537 int *i
, vleft
, first
=1, neg
, val
;
1541 char buf
[TMPBUFLEN
], *p
;
1542 char __user
*s
= buffer
;
1544 if (!table
->data
|| !table
->maxlen
|| !*lenp
||
1545 (*ppos
&& !write
)) {
1550 i
= (int *) table
->data
;
1551 vleft
= table
->maxlen
/ sizeof(*i
);
1555 conv
= do_proc_dointvec_conv
;
1557 for (; left
&& vleft
--; i
++, first
=0) {
1572 if (len
> sizeof(buf
) - 1)
1573 len
= sizeof(buf
) - 1;
1574 if (copy_from_user(buf
, s
, len
))
1578 if (*p
== '-' && left
> 1) {
1582 if (*p
< '0' || *p
> '9')
1585 lval
= simple_strtoul(p
, &p
, 0);
1588 if ((len
< left
) && *p
&& !isspace(*p
))
1595 if (conv(&neg
, &lval
, i
, 1, data
))
1602 if (conv(&neg
, &lval
, i
, 0, data
))
1605 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
1609 if(copy_to_user(s
, buf
, len
))
1616 if (!write
&& !first
&& left
) {
1617 if(put_user('\n', s
))
1624 if (get_user(c
, s
++))
1640 * proc_dointvec - read a vector of integers
1641 * @table: the sysctl table
1642 * @write: %TRUE if this is a write to the sysctl file
1643 * @filp: the file structure
1644 * @buffer: the user buffer
1645 * @lenp: the size of the user buffer
1646 * @ppos: file position
1648 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1649 * values from/to the user buffer, treated as an ASCII string.
1651 * Returns 0 on success.
1653 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1654 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1656 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1666 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
1668 int write
, void *data
)
1670 int op
= *(int *)data
;
1672 int val
= *negp
? -*lvalp
: *lvalp
;
1674 case OP_SET
: *valp
= val
; break;
1675 case OP_AND
: *valp
&= val
; break;
1676 case OP_OR
: *valp
|= val
; break;
1677 case OP_MAX
: if(*valp
< val
)
1680 case OP_MIN
: if(*valp
> val
)
1688 *lvalp
= (unsigned long)-val
;
1691 *lvalp
= (unsigned long)val
;
1698 * init may raise the set.
1701 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
1702 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1706 if (!capable(CAP_SYS_MODULE
)) {
1710 op
= (current
->pid
== 1) ? OP_SET
: OP_AND
;
1711 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1712 do_proc_dointvec_bset_conv
,&op
);
1715 struct do_proc_dointvec_minmax_conv_param
{
1720 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
1722 int write
, void *data
)
1724 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
1726 int val
= *negp
? -*lvalp
: *lvalp
;
1727 if ((param
->min
&& *param
->min
> val
) ||
1728 (param
->max
&& *param
->max
< val
))
1735 *lvalp
= (unsigned long)-val
;
1738 *lvalp
= (unsigned long)val
;
1745 * proc_dointvec_minmax - read a vector of integers with min/max values
1746 * @table: the sysctl table
1747 * @write: %TRUE if this is a write to the sysctl file
1748 * @filp: the file structure
1749 * @buffer: the user buffer
1750 * @lenp: the size of the user buffer
1751 * @ppos: file position
1753 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1754 * values from/to the user buffer, treated as an ASCII string.
1756 * This routine will ensure the values are within the range specified by
1757 * table->extra1 (min) and table->extra2 (max).
1759 * Returns 0 on success.
1761 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
1762 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1764 struct do_proc_dointvec_minmax_conv_param param
= {
1765 .min
= (int *) table
->extra1
,
1766 .max
= (int *) table
->extra2
,
1768 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
1769 do_proc_dointvec_minmax_conv
, ¶m
);
1772 static int do_proc_doulongvec_minmax(ctl_table
*table
, int write
,
1774 void __user
*buffer
,
1775 size_t *lenp
, loff_t
*ppos
,
1776 unsigned long convmul
,
1777 unsigned long convdiv
)
1779 #define TMPBUFLEN 21
1780 unsigned long *i
, *min
, *max
, val
;
1781 int vleft
, first
=1, neg
;
1783 char buf
[TMPBUFLEN
], *p
;
1784 char __user
*s
= buffer
;
1786 if (!table
->data
|| !table
->maxlen
|| !*lenp
||
1787 (*ppos
&& !write
)) {
1792 i
= (unsigned long *) table
->data
;
1793 min
= (unsigned long *) table
->extra1
;
1794 max
= (unsigned long *) table
->extra2
;
1795 vleft
= table
->maxlen
/ sizeof(unsigned long);
1798 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
1813 if (len
> TMPBUFLEN
-1)
1815 if (copy_from_user(buf
, s
, len
))
1819 if (*p
== '-' && left
> 1) {
1823 if (*p
< '0' || *p
> '9')
1825 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
1827 if ((len
< left
) && *p
&& !isspace(*p
))
1836 if ((min
&& val
< *min
) || (max
&& val
> *max
))
1843 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
1847 if(copy_to_user(s
, buf
, len
))
1854 if (!write
&& !first
&& left
) {
1855 if(put_user('\n', s
))
1862 if (get_user(c
, s
++))
1878 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1879 * @table: the sysctl table
1880 * @write: %TRUE if this is a write to the sysctl file
1881 * @filp: the file structure
1882 * @buffer: the user buffer
1883 * @lenp: the size of the user buffer
1884 * @ppos: file position
1886 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1887 * values from/to the user buffer, treated as an ASCII string.
1889 * This routine will ensure the values are within the range specified by
1890 * table->extra1 (min) and table->extra2 (max).
1892 * Returns 0 on success.
1894 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
1895 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1897 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
1901 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1902 * @table: the sysctl table
1903 * @write: %TRUE if this is a write to the sysctl file
1904 * @filp: the file structure
1905 * @buffer: the user buffer
1906 * @lenp: the size of the user buffer
1907 * @ppos: file position
1909 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1910 * values from/to the user buffer, treated as an ASCII string. The values
1911 * are treated as milliseconds, and converted to jiffies when they are stored.
1913 * This routine will ensure the values are within the range specified by
1914 * table->extra1 (min) and table->extra2 (max).
1916 * Returns 0 on success.
1918 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
1920 void __user
*buffer
,
1921 size_t *lenp
, loff_t
*ppos
)
1923 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
1924 lenp
, ppos
, HZ
, 1000l);
1928 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
1930 int write
, void *data
)
1933 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
1939 lval
= (unsigned long)-val
;
1942 lval
= (unsigned long)val
;
1949 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
1951 int write
, void *data
)
1954 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
1960 lval
= (unsigned long)-val
;
1963 lval
= (unsigned long)val
;
1965 *lvalp
= jiffies_to_clock_t(lval
);
1970 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
1972 int write
, void *data
)
1975 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
1981 lval
= (unsigned long)-val
;
1984 lval
= (unsigned long)val
;
1986 *lvalp
= jiffies_to_msecs(lval
);
1992 * proc_dointvec_jiffies - read a vector of integers as seconds
1993 * @table: the sysctl table
1994 * @write: %TRUE if this is a write to the sysctl file
1995 * @filp: the file structure
1996 * @buffer: the user buffer
1997 * @lenp: the size of the user buffer
1998 * @ppos: file position
2000 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2001 * values from/to the user buffer, treated as an ASCII string.
2002 * The values read are assumed to be in seconds, and are converted into
2005 * Returns 0 on success.
2007 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2008 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2010 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2011 do_proc_dointvec_jiffies_conv
,NULL
);
2015 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2016 * @table: the sysctl table
2017 * @write: %TRUE if this is a write to the sysctl file
2018 * @filp: the file structure
2019 * @buffer: the user buffer
2020 * @lenp: the size of the user buffer
2022 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2023 * values from/to the user buffer, treated as an ASCII string.
2024 * The values read are assumed to be in 1/USER_HZ seconds, and
2025 * are converted into jiffies.
2027 * Returns 0 on success.
2029 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2030 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2032 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2033 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2037 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2038 * @table: the sysctl table
2039 * @write: %TRUE if this is a write to the sysctl file
2040 * @filp: the file structure
2041 * @buffer: the user buffer
2042 * @lenp: the size of the user buffer
2043 * @ppos: file position
2044 * @ppos: the current position in the file
2046 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2047 * values from/to the user buffer, treated as an ASCII string.
2048 * The values read are assumed to be in 1/1000 seconds, and
2049 * are converted into jiffies.
2051 * Returns 0 on success.
2053 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2054 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2056 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2057 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2060 #else /* CONFIG_PROC_FS */
2062 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
2063 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2068 static int proc_doutsstring(ctl_table
*table
, int write
, struct file
*filp
,
2069 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2074 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2075 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2080 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
2081 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2086 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2087 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2092 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2093 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2098 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2099 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2104 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2105 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2110 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2111 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2116 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2118 void __user
*buffer
,
2119 size_t *lenp
, loff_t
*ppos
)
2125 #endif /* CONFIG_PROC_FS */
2129 * General sysctl support routines
2132 /* The generic string strategy routine: */
2133 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2134 void __user
*oldval
, size_t __user
*oldlenp
,
2135 void __user
*newval
, size_t newlen
, void **context
)
2139 if (!table
->data
|| !table
->maxlen
)
2142 if (oldval
&& oldlenp
) {
2143 if (get_user(len
, oldlenp
))
2146 l
= strlen(table
->data
);
2147 if (len
> l
) len
= l
;
2148 if (len
>= table
->maxlen
)
2149 len
= table
->maxlen
;
2150 if(copy_to_user(oldval
, table
->data
, len
))
2152 if(put_user(0, ((char __user
*) oldval
) + len
))
2154 if(put_user(len
, oldlenp
))
2158 if (newval
&& newlen
) {
2160 if (len
> table
->maxlen
)
2161 len
= table
->maxlen
;
2162 if(copy_from_user(table
->data
, newval
, len
))
2164 if (len
== table
->maxlen
)
2166 ((char *) table
->data
)[len
] = 0;
2172 * This function makes sure that all of the integers in the vector
2173 * are between the minimum and maximum values given in the arrays
2174 * table->extra1 and table->extra2, respectively.
2176 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2177 void __user
*oldval
, size_t __user
*oldlenp
,
2178 void __user
*newval
, size_t newlen
, void **context
)
2181 if (newval
&& newlen
) {
2182 int __user
*vec
= (int __user
*) newval
;
2183 int *min
= (int *) table
->extra1
;
2184 int *max
= (int *) table
->extra2
;
2188 if (newlen
% sizeof(int) != 0)
2191 if (!table
->extra1
&& !table
->extra2
)
2194 if (newlen
> table
->maxlen
)
2195 newlen
= table
->maxlen
;
2196 length
= newlen
/ sizeof(int);
2198 for (i
= 0; i
< length
; i
++) {
2200 if (get_user(value
, vec
+ i
))
2202 if (min
&& value
< min
[i
])
2204 if (max
&& value
> max
[i
])
2211 /* Strategy function to convert jiffies to seconds */
2212 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2213 void __user
*oldval
, size_t __user
*oldlenp
,
2214 void __user
*newval
, size_t newlen
, void **context
)
2219 if (get_user(olen
, oldlenp
))
2221 if (olen
!=sizeof(int))
2224 if (put_user(*(int *)(table
->data
)/HZ
, (int __user
*)oldval
) ||
2225 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2228 if (newval
&& newlen
) {
2230 if (newlen
!= sizeof(int))
2232 if (get_user(new, (int __user
*)newval
))
2234 *(int *)(table
->data
) = new*HZ
;
2239 /* Strategy function to convert jiffies to seconds */
2240 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2241 void __user
*oldval
, size_t __user
*oldlenp
,
2242 void __user
*newval
, size_t newlen
, void **context
)
2247 if (get_user(olen
, oldlenp
))
2249 if (olen
!=sizeof(int))
2252 if (put_user(jiffies_to_msecs(*(int *)(table
->data
)), (int __user
*)oldval
) ||
2253 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2256 if (newval
&& newlen
) {
2258 if (newlen
!= sizeof(int))
2260 if (get_user(new, (int __user
*)newval
))
2262 *(int *)(table
->data
) = msecs_to_jiffies(new);
2267 #else /* CONFIG_SYSCTL */
2270 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2275 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2276 void __user
*oldval
, size_t __user
*oldlenp
,
2277 void __user
*newval
, size_t newlen
, void **context
)
2282 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2283 void __user
*oldval
, size_t __user
*oldlenp
,
2284 void __user
*newval
, size_t newlen
, void **context
)
2289 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2290 void __user
*oldval
, size_t __user
*oldlenp
,
2291 void __user
*newval
, size_t newlen
, void **context
)
2296 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2297 void __user
*oldval
, size_t __user
*oldlenp
,
2298 void __user
*newval
, size_t newlen
, void **context
)
2303 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
2304 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2309 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2310 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2315 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
2316 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2321 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2322 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2327 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2328 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2333 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2334 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2339 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2340 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2345 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2346 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2351 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2353 void __user
*buffer
,
2354 size_t *lenp
, loff_t
*ppos
)
2359 struct ctl_table_header
* register_sysctl_table(ctl_table
* table
,
2365 void unregister_sysctl_table(struct ctl_table_header
* table
)
2369 #endif /* CONFIG_SYSCTL */
2372 * No sense putting this after each symbol definition, twice,
2373 * exception granted :-)
2375 EXPORT_SYMBOL(proc_dointvec
);
2376 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2377 EXPORT_SYMBOL(proc_dointvec_minmax
);
2378 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2379 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2380 EXPORT_SYMBOL(proc_dostring
);
2381 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2382 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
2383 EXPORT_SYMBOL(register_sysctl_table
);
2384 EXPORT_SYMBOL(sysctl_intvec
);
2385 EXPORT_SYMBOL(sysctl_jiffies
);
2386 EXPORT_SYMBOL(sysctl_ms_jiffies
);
2387 EXPORT_SYMBOL(sysctl_string
);
2388 EXPORT_SYMBOL(unregister_sysctl_table
);