2 * sysctl.c: General linux system control interface
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
21 #include <linux/config.h>
22 #include <linux/module.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/proc_fs.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/capability.h>
31 #include <linux/smp_lock.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/hugetlb.h>
40 #include <linux/security.h>
41 #include <linux/initrd.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
47 #include <asm/uaccess.h>
48 #include <asm/processor.h>
50 #ifdef CONFIG_ROOT_NFS
51 #include <linux/nfs_fs.h>
54 #if defined(CONFIG_SYSCTL)
56 /* External variables not in a header file. */
58 extern int sysctl_overcommit_memory
;
59 extern int sysctl_overcommit_ratio
;
60 extern int max_threads
;
61 extern int sysrq_enabled
;
62 extern int core_uses_pid
;
63 extern int suid_dumpable
;
64 extern char core_pattern
[];
67 extern int min_free_kbytes
;
68 extern int printk_ratelimit_jiffies
;
69 extern int printk_ratelimit_burst
;
70 extern int pid_max_min
, pid_max_max
;
71 extern int sysctl_drop_caches
;
73 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
74 int unknown_nmi_panic
;
75 extern int proc_unknown_nmi_panic(ctl_table
*, int, struct file
*,
76 void __user
*, size_t *, loff_t
*);
79 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
80 static int maxolduid
= 65535;
83 static int ngroups_max
= NGROUPS_MAX
;
86 extern char modprobe_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
;
113 #ifdef CONFIG_MATHEMU
114 extern int sysctl_ieee_emulation_warnings
;
116 extern int sysctl_userprocess_debug
;
117 extern int spin_retry
;
120 extern int sysctl_hz_timer
;
122 #ifdef CONFIG_BSD_PROCESS_ACCT
123 extern int acct_parm
[];
126 int randomize_va_space
= 1;
128 static int parse_table(int __user
*, int, void __user
*, size_t __user
*, void __user
*, size_t,
129 ctl_table
*, void **);
130 static int proc_doutsstring(ctl_table
*table
, int write
, struct file
*filp
,
131 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
133 static ctl_table root_table
[];
134 static struct ctl_table_header root_table_header
=
135 { root_table
, LIST_HEAD_INIT(root_table_header
.ctl_entry
) };
137 static ctl_table kern_table
[];
138 static ctl_table vm_table
[];
139 static ctl_table proc_table
[];
140 static ctl_table fs_table
[];
141 static ctl_table debug_table
[];
142 static ctl_table dev_table
[];
143 extern ctl_table random_table
[];
144 #ifdef CONFIG_UNIX98_PTYS
145 extern ctl_table pty_table
[];
147 #ifdef CONFIG_INOTIFY
148 extern ctl_table inotify_table
[];
151 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
152 int sysctl_legacy_va_layout
;
155 /* /proc declarations: */
157 #ifdef CONFIG_PROC_FS
159 static ssize_t
proc_readsys(struct file
*, char __user
*, size_t, loff_t
*);
160 static ssize_t
proc_writesys(struct file
*, const char __user
*, size_t, loff_t
*);
161 static int proc_opensys(struct inode
*, struct file
*);
163 struct file_operations proc_sys_file_operations
= {
164 .open
= proc_opensys
,
165 .read
= proc_readsys
,
166 .write
= proc_writesys
,
169 extern struct proc_dir_entry
*proc_sys_root
;
171 static void register_proc_table(ctl_table
*, struct proc_dir_entry
*, void *);
172 static void unregister_proc_table(ctl_table
*, struct proc_dir_entry
*);
175 /* The default sysctl tables: */
177 static ctl_table root_table
[] = {
179 .ctl_name
= CTL_KERN
,
180 .procname
= "kernel",
199 .ctl_name
= CTL_PROC
,
211 .ctl_name
= CTL_DEBUG
,
214 .child
= debug_table
,
226 static ctl_table kern_table
[] = {
228 .ctl_name
= KERN_OSTYPE
,
229 .procname
= "ostype",
230 .data
= system_utsname
.sysname
,
231 .maxlen
= sizeof(system_utsname
.sysname
),
233 .proc_handler
= &proc_doutsstring
,
234 .strategy
= &sysctl_string
,
237 .ctl_name
= KERN_OSRELEASE
,
238 .procname
= "osrelease",
239 .data
= system_utsname
.release
,
240 .maxlen
= sizeof(system_utsname
.release
),
242 .proc_handler
= &proc_doutsstring
,
243 .strategy
= &sysctl_string
,
246 .ctl_name
= KERN_VERSION
,
247 .procname
= "version",
248 .data
= system_utsname
.version
,
249 .maxlen
= sizeof(system_utsname
.version
),
251 .proc_handler
= &proc_doutsstring
,
252 .strategy
= &sysctl_string
,
255 .ctl_name
= KERN_NODENAME
,
256 .procname
= "hostname",
257 .data
= system_utsname
.nodename
,
258 .maxlen
= sizeof(system_utsname
.nodename
),
260 .proc_handler
= &proc_doutsstring
,
261 .strategy
= &sysctl_string
,
264 .ctl_name
= KERN_DOMAINNAME
,
265 .procname
= "domainname",
266 .data
= system_utsname
.domainname
,
267 .maxlen
= sizeof(system_utsname
.domainname
),
269 .proc_handler
= &proc_doutsstring
,
270 .strategy
= &sysctl_string
,
273 .ctl_name
= KERN_PANIC
,
275 .data
= &panic_timeout
,
276 .maxlen
= sizeof(int),
278 .proc_handler
= &proc_dointvec
,
281 .ctl_name
= KERN_CORE_USES_PID
,
282 .procname
= "core_uses_pid",
283 .data
= &core_uses_pid
,
284 .maxlen
= sizeof(int),
286 .proc_handler
= &proc_dointvec
,
289 .ctl_name
= KERN_CORE_PATTERN
,
290 .procname
= "core_pattern",
291 .data
= core_pattern
,
294 .proc_handler
= &proc_dostring
,
295 .strategy
= &sysctl_string
,
298 .ctl_name
= KERN_TAINTED
,
299 .procname
= "tainted",
301 .maxlen
= sizeof(int),
303 .proc_handler
= &proc_dointvec
,
306 .ctl_name
= KERN_CAP_BSET
,
307 .procname
= "cap-bound",
309 .maxlen
= sizeof(kernel_cap_t
),
311 .proc_handler
= &proc_dointvec_bset
,
313 #ifdef CONFIG_BLK_DEV_INITRD
315 .ctl_name
= KERN_REALROOTDEV
,
316 .procname
= "real-root-dev",
317 .data
= &real_root_dev
,
318 .maxlen
= sizeof(int),
320 .proc_handler
= &proc_dointvec
,
325 .ctl_name
= KERN_SPARC_REBOOT
,
326 .procname
= "reboot-cmd",
327 .data
= reboot_command
,
330 .proc_handler
= &proc_dostring
,
331 .strategy
= &sysctl_string
,
334 .ctl_name
= KERN_SPARC_STOP_A
,
335 .procname
= "stop-a",
336 .data
= &stop_a_enabled
,
337 .maxlen
= sizeof (int),
339 .proc_handler
= &proc_dointvec
,
342 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
343 .procname
= "scons-poweroff",
344 .data
= &scons_pwroff
,
345 .maxlen
= sizeof (int),
347 .proc_handler
= &proc_dointvec
,
352 .ctl_name
= KERN_HPPA_PWRSW
,
353 .procname
= "soft-power",
354 .data
= &pwrsw_enabled
,
355 .maxlen
= sizeof (int),
357 .proc_handler
= &proc_dointvec
,
360 .ctl_name
= KERN_HPPA_UNALIGNED
,
361 .procname
= "unaligned-trap",
362 .data
= &unaligned_enabled
,
363 .maxlen
= sizeof (int),
365 .proc_handler
= &proc_dointvec
,
369 .ctl_name
= KERN_CTLALTDEL
,
370 .procname
= "ctrl-alt-del",
372 .maxlen
= sizeof(int),
374 .proc_handler
= &proc_dointvec
,
377 .ctl_name
= KERN_PRINTK
,
378 .procname
= "printk",
379 .data
= &console_loglevel
,
380 .maxlen
= 4*sizeof(int),
382 .proc_handler
= &proc_dointvec
,
386 .ctl_name
= KERN_MODPROBE
,
387 .procname
= "modprobe",
388 .data
= &modprobe_path
,
389 .maxlen
= KMOD_PATH_LEN
,
391 .proc_handler
= &proc_dostring
,
392 .strategy
= &sysctl_string
,
395 #ifdef CONFIG_HOTPLUG
397 .ctl_name
= KERN_HOTPLUG
,
398 .procname
= "hotplug",
399 .data
= &uevent_helper
,
400 .maxlen
= UEVENT_HELPER_PATH_LEN
,
402 .proc_handler
= &proc_dostring
,
403 .strategy
= &sysctl_string
,
406 #ifdef CONFIG_CHR_DEV_SG
408 .ctl_name
= KERN_SG_BIG_BUFF
,
409 .procname
= "sg-big-buff",
410 .data
= &sg_big_buff
,
411 .maxlen
= sizeof (int),
413 .proc_handler
= &proc_dointvec
,
416 #ifdef CONFIG_BSD_PROCESS_ACCT
418 .ctl_name
= KERN_ACCT
,
421 .maxlen
= 3*sizeof(int),
423 .proc_handler
= &proc_dointvec
,
426 #ifdef CONFIG_SYSVIPC
428 .ctl_name
= KERN_SHMMAX
,
429 .procname
= "shmmax",
431 .maxlen
= sizeof (size_t),
433 .proc_handler
= &proc_doulongvec_minmax
,
436 .ctl_name
= KERN_SHMALL
,
437 .procname
= "shmall",
439 .maxlen
= sizeof (size_t),
441 .proc_handler
= &proc_doulongvec_minmax
,
444 .ctl_name
= KERN_SHMMNI
,
445 .procname
= "shmmni",
447 .maxlen
= sizeof (int),
449 .proc_handler
= &proc_dointvec
,
452 .ctl_name
= KERN_MSGMAX
,
453 .procname
= "msgmax",
455 .maxlen
= sizeof (int),
457 .proc_handler
= &proc_dointvec
,
460 .ctl_name
= KERN_MSGMNI
,
461 .procname
= "msgmni",
463 .maxlen
= sizeof (int),
465 .proc_handler
= &proc_dointvec
,
468 .ctl_name
= KERN_MSGMNB
,
469 .procname
= "msgmnb",
471 .maxlen
= sizeof (int),
473 .proc_handler
= &proc_dointvec
,
476 .ctl_name
= KERN_SEM
,
479 .maxlen
= 4*sizeof (int),
481 .proc_handler
= &proc_dointvec
,
484 #ifdef CONFIG_MAGIC_SYSRQ
486 .ctl_name
= KERN_SYSRQ
,
488 .data
= &sysrq_enabled
,
489 .maxlen
= sizeof (int),
491 .proc_handler
= &proc_dointvec
,
495 .ctl_name
= KERN_CADPID
,
496 .procname
= "cad_pid",
498 .maxlen
= sizeof (int),
500 .proc_handler
= &proc_dointvec
,
503 .ctl_name
= KERN_MAX_THREADS
,
504 .procname
= "threads-max",
505 .data
= &max_threads
,
506 .maxlen
= sizeof(int),
508 .proc_handler
= &proc_dointvec
,
511 .ctl_name
= KERN_RANDOM
,
512 .procname
= "random",
514 .child
= random_table
,
516 #ifdef CONFIG_UNIX98_PTYS
518 .ctl_name
= KERN_PTY
,
525 .ctl_name
= KERN_OVERFLOWUID
,
526 .procname
= "overflowuid",
527 .data
= &overflowuid
,
528 .maxlen
= sizeof(int),
530 .proc_handler
= &proc_dointvec_minmax
,
531 .strategy
= &sysctl_intvec
,
532 .extra1
= &minolduid
,
533 .extra2
= &maxolduid
,
536 .ctl_name
= KERN_OVERFLOWGID
,
537 .procname
= "overflowgid",
538 .data
= &overflowgid
,
539 .maxlen
= sizeof(int),
541 .proc_handler
= &proc_dointvec_minmax
,
542 .strategy
= &sysctl_intvec
,
543 .extra1
= &minolduid
,
544 .extra2
= &maxolduid
,
547 #ifdef CONFIG_MATHEMU
549 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
550 .procname
= "ieee_emulation_warnings",
551 .data
= &sysctl_ieee_emulation_warnings
,
552 .maxlen
= sizeof(int),
554 .proc_handler
= &proc_dointvec
,
557 #ifdef CONFIG_NO_IDLE_HZ
559 .ctl_name
= KERN_HZ_TIMER
,
560 .procname
= "hz_timer",
561 .data
= &sysctl_hz_timer
,
562 .maxlen
= sizeof(int),
564 .proc_handler
= &proc_dointvec
,
568 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
569 .procname
= "userprocess_debug",
570 .data
= &sysctl_userprocess_debug
,
571 .maxlen
= sizeof(int),
573 .proc_handler
= &proc_dointvec
,
577 .ctl_name
= KERN_PIDMAX
,
578 .procname
= "pid_max",
580 .maxlen
= sizeof (int),
582 .proc_handler
= &proc_dointvec_minmax
,
583 .strategy
= sysctl_intvec
,
584 .extra1
= &pid_max_min
,
585 .extra2
= &pid_max_max
,
588 .ctl_name
= KERN_PANIC_ON_OOPS
,
589 .procname
= "panic_on_oops",
590 .data
= &panic_on_oops
,
591 .maxlen
= sizeof(int),
593 .proc_handler
= &proc_dointvec
,
596 .ctl_name
= KERN_PRINTK_RATELIMIT
,
597 .procname
= "printk_ratelimit",
598 .data
= &printk_ratelimit_jiffies
,
599 .maxlen
= sizeof(int),
601 .proc_handler
= &proc_dointvec_jiffies
,
602 .strategy
= &sysctl_jiffies
,
605 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
606 .procname
= "printk_ratelimit_burst",
607 .data
= &printk_ratelimit_burst
,
608 .maxlen
= sizeof(int),
610 .proc_handler
= &proc_dointvec
,
613 .ctl_name
= KERN_NGROUPS_MAX
,
614 .procname
= "ngroups_max",
615 .data
= &ngroups_max
,
616 .maxlen
= sizeof (int),
618 .proc_handler
= &proc_dointvec
,
620 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
622 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
623 .procname
= "unknown_nmi_panic",
624 .data
= &unknown_nmi_panic
,
625 .maxlen
= sizeof (int),
627 .proc_handler
= &proc_unknown_nmi_panic
,
630 #if defined(CONFIG_X86)
632 .ctl_name
= KERN_BOOTLOADER_TYPE
,
633 .procname
= "bootloader_type",
634 .data
= &bootloader_type
,
635 .maxlen
= sizeof (int),
637 .proc_handler
= &proc_dointvec
,
641 .ctl_name
= KERN_RANDOMIZE
,
642 .procname
= "randomize_va_space",
643 .data
= &randomize_va_space
,
644 .maxlen
= sizeof(int),
646 .proc_handler
= &proc_dointvec
,
648 #if defined(CONFIG_S390)
650 .ctl_name
= KERN_SPIN_RETRY
,
651 .procname
= "spin_retry",
653 .maxlen
= sizeof (int),
655 .proc_handler
= &proc_dointvec
,
661 /* Constants for minimum and maximum testing in vm_table.
662 We use these as one-element integer vectors. */
664 static int one_hundred
= 100;
667 static ctl_table vm_table
[] = {
669 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
670 .procname
= "overcommit_memory",
671 .data
= &sysctl_overcommit_memory
,
672 .maxlen
= sizeof(sysctl_overcommit_memory
),
674 .proc_handler
= &proc_dointvec
,
677 .ctl_name
= VM_OVERCOMMIT_RATIO
,
678 .procname
= "overcommit_ratio",
679 .data
= &sysctl_overcommit_ratio
,
680 .maxlen
= sizeof(sysctl_overcommit_ratio
),
682 .proc_handler
= &proc_dointvec
,
685 .ctl_name
= VM_PAGE_CLUSTER
,
686 .procname
= "page-cluster",
687 .data
= &page_cluster
,
688 .maxlen
= sizeof(int),
690 .proc_handler
= &proc_dointvec
,
693 .ctl_name
= VM_DIRTY_BACKGROUND
,
694 .procname
= "dirty_background_ratio",
695 .data
= &dirty_background_ratio
,
696 .maxlen
= sizeof(dirty_background_ratio
),
698 .proc_handler
= &proc_dointvec_minmax
,
699 .strategy
= &sysctl_intvec
,
701 .extra2
= &one_hundred
,
704 .ctl_name
= VM_DIRTY_RATIO
,
705 .procname
= "dirty_ratio",
706 .data
= &vm_dirty_ratio
,
707 .maxlen
= sizeof(vm_dirty_ratio
),
709 .proc_handler
= &proc_dointvec_minmax
,
710 .strategy
= &sysctl_intvec
,
712 .extra2
= &one_hundred
,
715 .ctl_name
= VM_DIRTY_WB_CS
,
716 .procname
= "dirty_writeback_centisecs",
717 .data
= &dirty_writeback_centisecs
,
718 .maxlen
= sizeof(dirty_writeback_centisecs
),
720 .proc_handler
= &dirty_writeback_centisecs_handler
,
723 .ctl_name
= VM_DIRTY_EXPIRE_CS
,
724 .procname
= "dirty_expire_centisecs",
725 .data
= &dirty_expire_centisecs
,
726 .maxlen
= sizeof(dirty_expire_centisecs
),
728 .proc_handler
= &proc_dointvec
,
731 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
732 .procname
= "nr_pdflush_threads",
733 .data
= &nr_pdflush_threads
,
734 .maxlen
= sizeof nr_pdflush_threads
,
735 .mode
= 0444 /* read-only*/,
736 .proc_handler
= &proc_dointvec
,
739 .ctl_name
= VM_SWAPPINESS
,
740 .procname
= "swappiness",
741 .data
= &vm_swappiness
,
742 .maxlen
= sizeof(vm_swappiness
),
744 .proc_handler
= &proc_dointvec_minmax
,
745 .strategy
= &sysctl_intvec
,
747 .extra2
= &one_hundred
,
749 #ifdef CONFIG_HUGETLB_PAGE
751 .ctl_name
= VM_HUGETLB_PAGES
,
752 .procname
= "nr_hugepages",
753 .data
= &max_huge_pages
,
754 .maxlen
= sizeof(unsigned long),
756 .proc_handler
= &hugetlb_sysctl_handler
,
757 .extra1
= (void *)&hugetlb_zero
,
758 .extra2
= (void *)&hugetlb_infinity
,
761 .ctl_name
= VM_HUGETLB_GROUP
,
762 .procname
= "hugetlb_shm_group",
763 .data
= &sysctl_hugetlb_shm_group
,
764 .maxlen
= sizeof(gid_t
),
766 .proc_handler
= &proc_dointvec
,
770 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
771 .procname
= "lowmem_reserve_ratio",
772 .data
= &sysctl_lowmem_reserve_ratio
,
773 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
775 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
776 .strategy
= &sysctl_intvec
,
779 .ctl_name
= VM_DROP_PAGECACHE
,
780 .procname
= "drop_caches",
781 .data
= &sysctl_drop_caches
,
782 .maxlen
= sizeof(int),
784 .proc_handler
= drop_caches_sysctl_handler
,
785 .strategy
= &sysctl_intvec
,
788 .ctl_name
= VM_MIN_FREE_KBYTES
,
789 .procname
= "min_free_kbytes",
790 .data
= &min_free_kbytes
,
791 .maxlen
= sizeof(min_free_kbytes
),
793 .proc_handler
= &min_free_kbytes_sysctl_handler
,
794 .strategy
= &sysctl_intvec
,
799 .ctl_name
= VM_MAX_MAP_COUNT
,
800 .procname
= "max_map_count",
801 .data
= &sysctl_max_map_count
,
802 .maxlen
= sizeof(sysctl_max_map_count
),
804 .proc_handler
= &proc_dointvec
808 .ctl_name
= VM_LAPTOP_MODE
,
809 .procname
= "laptop_mode",
810 .data
= &laptop_mode
,
811 .maxlen
= sizeof(laptop_mode
),
813 .proc_handler
= &proc_dointvec
,
814 .strategy
= &sysctl_intvec
,
818 .ctl_name
= VM_BLOCK_DUMP
,
819 .procname
= "block_dump",
821 .maxlen
= sizeof(block_dump
),
823 .proc_handler
= &proc_dointvec
,
824 .strategy
= &sysctl_intvec
,
828 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
829 .procname
= "vfs_cache_pressure",
830 .data
= &sysctl_vfs_cache_pressure
,
831 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
833 .proc_handler
= &proc_dointvec
,
834 .strategy
= &sysctl_intvec
,
837 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
839 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
840 .procname
= "legacy_va_layout",
841 .data
= &sysctl_legacy_va_layout
,
842 .maxlen
= sizeof(sysctl_legacy_va_layout
),
844 .proc_handler
= &proc_dointvec
,
845 .strategy
= &sysctl_intvec
,
851 .ctl_name
= VM_SWAP_TOKEN_TIMEOUT
,
852 .procname
= "swap_token_timeout",
853 .data
= &swap_token_default_timeout
,
854 .maxlen
= sizeof(swap_token_default_timeout
),
856 .proc_handler
= &proc_dointvec_jiffies
,
857 .strategy
= &sysctl_jiffies
,
863 static ctl_table proc_table
[] = {
867 static ctl_table fs_table
[] = {
869 .ctl_name
= FS_NRINODE
,
870 .procname
= "inode-nr",
871 .data
= &inodes_stat
,
872 .maxlen
= 2*sizeof(int),
874 .proc_handler
= &proc_dointvec
,
877 .ctl_name
= FS_STATINODE
,
878 .procname
= "inode-state",
879 .data
= &inodes_stat
,
880 .maxlen
= 7*sizeof(int),
882 .proc_handler
= &proc_dointvec
,
885 .ctl_name
= FS_NRFILE
,
886 .procname
= "file-nr",
888 .maxlen
= 3*sizeof(int),
890 .proc_handler
= &proc_dointvec
,
893 .ctl_name
= FS_MAXFILE
,
894 .procname
= "file-max",
895 .data
= &files_stat
.max_files
,
896 .maxlen
= sizeof(int),
898 .proc_handler
= &proc_dointvec
,
901 .ctl_name
= FS_DENTRY
,
902 .procname
= "dentry-state",
903 .data
= &dentry_stat
,
904 .maxlen
= 6*sizeof(int),
906 .proc_handler
= &proc_dointvec
,
909 .ctl_name
= FS_OVERFLOWUID
,
910 .procname
= "overflowuid",
911 .data
= &fs_overflowuid
,
912 .maxlen
= sizeof(int),
914 .proc_handler
= &proc_dointvec_minmax
,
915 .strategy
= &sysctl_intvec
,
916 .extra1
= &minolduid
,
917 .extra2
= &maxolduid
,
920 .ctl_name
= FS_OVERFLOWGID
,
921 .procname
= "overflowgid",
922 .data
= &fs_overflowgid
,
923 .maxlen
= sizeof(int),
925 .proc_handler
= &proc_dointvec_minmax
,
926 .strategy
= &sysctl_intvec
,
927 .extra1
= &minolduid
,
928 .extra2
= &maxolduid
,
931 .ctl_name
= FS_LEASES
,
932 .procname
= "leases-enable",
933 .data
= &leases_enable
,
934 .maxlen
= sizeof(int),
936 .proc_handler
= &proc_dointvec
,
938 #ifdef CONFIG_DNOTIFY
940 .ctl_name
= FS_DIR_NOTIFY
,
941 .procname
= "dir-notify-enable",
942 .data
= &dir_notify_enable
,
943 .maxlen
= sizeof(int),
945 .proc_handler
= &proc_dointvec
,
950 .ctl_name
= FS_LEASE_TIME
,
951 .procname
= "lease-break-time",
952 .data
= &lease_break_time
,
953 .maxlen
= sizeof(int),
955 .proc_handler
= &proc_dointvec
,
958 .ctl_name
= FS_AIO_NR
,
959 .procname
= "aio-nr",
961 .maxlen
= sizeof(aio_nr
),
963 .proc_handler
= &proc_doulongvec_minmax
,
966 .ctl_name
= FS_AIO_MAX_NR
,
967 .procname
= "aio-max-nr",
969 .maxlen
= sizeof(aio_max_nr
),
971 .proc_handler
= &proc_doulongvec_minmax
,
973 #ifdef CONFIG_INOTIFY
975 .ctl_name
= FS_INOTIFY
,
976 .procname
= "inotify",
978 .child
= inotify_table
,
983 .ctl_name
= KERN_SETUID_DUMPABLE
,
984 .procname
= "suid_dumpable",
985 .data
= &suid_dumpable
,
986 .maxlen
= sizeof(int),
988 .proc_handler
= &proc_dointvec
,
993 static ctl_table debug_table
[] = {
997 static ctl_table dev_table
[] = {
1001 extern void init_irq_proc (void);
1003 static DEFINE_SPINLOCK(sysctl_lock
);
1005 /* called under sysctl_lock */
1006 static int use_table(struct ctl_table_header
*p
)
1008 if (unlikely(p
->unregistering
))
1014 /* called under sysctl_lock */
1015 static void unuse_table(struct ctl_table_header
*p
)
1018 if (unlikely(p
->unregistering
))
1019 complete(p
->unregistering
);
1022 /* called under sysctl_lock, will reacquire if has to wait */
1023 static void start_unregistering(struct ctl_table_header
*p
)
1026 * if p->used is 0, nobody will ever touch that entry again;
1027 * we'll eliminate all paths to it before dropping sysctl_lock
1029 if (unlikely(p
->used
)) {
1030 struct completion wait
;
1031 init_completion(&wait
);
1032 p
->unregistering
= &wait
;
1033 spin_unlock(&sysctl_lock
);
1034 wait_for_completion(&wait
);
1035 spin_lock(&sysctl_lock
);
1038 * do not remove from the list until nobody holds it; walking the
1039 * list in do_sysctl() relies on that.
1041 list_del_init(&p
->ctl_entry
);
1044 void __init
sysctl_init(void)
1046 #ifdef CONFIG_PROC_FS
1047 register_proc_table(root_table
, proc_sys_root
, &root_table_header
);
1052 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1053 void __user
*newval
, size_t newlen
)
1055 struct list_head
*tmp
;
1056 int error
= -ENOTDIR
;
1058 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1062 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1065 spin_lock(&sysctl_lock
);
1066 tmp
= &root_table_header
.ctl_entry
;
1068 struct ctl_table_header
*head
=
1069 list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1070 void *context
= NULL
;
1072 if (!use_table(head
))
1075 spin_unlock(&sysctl_lock
);
1077 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1078 newval
, newlen
, head
->ctl_table
,
1082 spin_lock(&sysctl_lock
);
1084 if (error
!= -ENOTDIR
)
1086 } while ((tmp
= tmp
->next
) != &root_table_header
.ctl_entry
);
1087 spin_unlock(&sysctl_lock
);
1091 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1093 struct __sysctl_args tmp
;
1096 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1100 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1101 tmp
.newval
, tmp
.newlen
);
1107 * ctl_perm does NOT grant the superuser all rights automatically, because
1108 * some sysctl variables are readonly even to root.
1111 static int test_perm(int mode
, int op
)
1115 else if (in_egroup_p(0))
1117 if ((mode
& op
& 0007) == op
)
1122 static inline int ctl_perm(ctl_table
*table
, int op
)
1125 error
= security_sysctl(table
, op
);
1128 return test_perm(table
->mode
, op
);
1131 static int parse_table(int __user
*name
, int nlen
,
1132 void __user
*oldval
, size_t __user
*oldlenp
,
1133 void __user
*newval
, size_t newlen
,
1134 ctl_table
*table
, void **context
)
1140 if (get_user(n
, name
))
1142 for ( ; table
->ctl_name
; table
++) {
1143 if (n
== table
->ctl_name
|| table
->ctl_name
== CTL_ANY
) {
1146 if (ctl_perm(table
, 001))
1148 if (table
->strategy
) {
1149 error
= table
->strategy(
1152 newval
, newlen
, context
);
1158 table
= table
->child
;
1161 error
= do_sysctl_strategy(table
, name
, nlen
,
1163 newval
, newlen
, context
);
1170 /* Perform the actual read/write of a sysctl table entry. */
1171 int do_sysctl_strategy (ctl_table
*table
,
1172 int __user
*name
, int nlen
,
1173 void __user
*oldval
, size_t __user
*oldlenp
,
1174 void __user
*newval
, size_t newlen
, void **context
)
1183 if (ctl_perm(table
, op
))
1186 if (table
->strategy
) {
1187 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1188 newval
, newlen
, context
);
1195 /* If there is no strategy routine, or if the strategy returns
1196 * zero, proceed with automatic r/w */
1197 if (table
->data
&& table
->maxlen
) {
1198 if (oldval
&& oldlenp
) {
1199 if (get_user(len
, oldlenp
))
1202 if (len
> table
->maxlen
)
1203 len
= table
->maxlen
;
1204 if(copy_to_user(oldval
, table
->data
, len
))
1206 if(put_user(len
, oldlenp
))
1210 if (newval
&& newlen
) {
1212 if (len
> table
->maxlen
)
1213 len
= table
->maxlen
;
1214 if(copy_from_user(table
->data
, newval
, len
))
1222 * register_sysctl_table - register a sysctl hierarchy
1223 * @table: the top-level table structure
1224 * @insert_at_head: whether the entry should be inserted in front or at the end
1226 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1227 * array. An entry with a ctl_name of 0 terminates the table.
1229 * The members of the &ctl_table structure are used as follows:
1231 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1232 * must be unique within that level of sysctl
1234 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1235 * enter a sysctl file
1237 * data - a pointer to data for use by proc_handler
1239 * maxlen - the maximum size in bytes of the data
1241 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1243 * child - a pointer to the child sysctl table if this entry is a directory, or
1246 * proc_handler - the text handler routine (described below)
1248 * strategy - the strategy routine (described below)
1250 * de - for internal use by the sysctl routines
1252 * extra1, extra2 - extra pointers usable by the proc handler routines
1254 * Leaf nodes in the sysctl tree will be represented by a single file
1255 * under /proc; non-leaf nodes will be represented by directories.
1257 * sysctl(2) can automatically manage read and write requests through
1258 * the sysctl table. The data and maxlen fields of the ctl_table
1259 * struct enable minimal validation of the values being written to be
1260 * performed, and the mode field allows minimal authentication.
1262 * More sophisticated management can be enabled by the provision of a
1263 * strategy routine with the table entry. This will be called before
1264 * any automatic read or write of the data is performed.
1266 * The strategy routine may return
1268 * < 0 - Error occurred (error is passed to user process)
1270 * 0 - OK - proceed with automatic read or write.
1272 * > 0 - OK - read or write has been done by the strategy routine, so
1273 * return immediately.
1275 * There must be a proc_handler routine for any terminal nodes
1276 * mirrored under /proc/sys (non-terminals are handled by a built-in
1277 * directory handler). Several default handlers are available to
1278 * cover common cases -
1280 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1281 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1282 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1284 * It is the handler's job to read the input buffer from user memory
1285 * and process it. The handler should return 0 on success.
1287 * This routine returns %NULL on a failure to register, and a pointer
1288 * to the table header on success.
1290 struct ctl_table_header
*register_sysctl_table(ctl_table
* table
,
1293 struct ctl_table_header
*tmp
;
1294 tmp
= kmalloc(sizeof(struct ctl_table_header
), GFP_KERNEL
);
1297 tmp
->ctl_table
= table
;
1298 INIT_LIST_HEAD(&tmp
->ctl_entry
);
1300 tmp
->unregistering
= NULL
;
1301 spin_lock(&sysctl_lock
);
1303 list_add(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1305 list_add_tail(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1306 spin_unlock(&sysctl_lock
);
1307 #ifdef CONFIG_PROC_FS
1308 register_proc_table(table
, proc_sys_root
, tmp
);
1314 * unregister_sysctl_table - unregister a sysctl table hierarchy
1315 * @header: the header returned from register_sysctl_table
1317 * Unregisters the sysctl table and all children. proc entries may not
1318 * actually be removed until they are no longer used by anyone.
1320 void unregister_sysctl_table(struct ctl_table_header
* header
)
1323 spin_lock(&sysctl_lock
);
1324 start_unregistering(header
);
1325 #ifdef CONFIG_PROC_FS
1326 unregister_proc_table(header
->ctl_table
, proc_sys_root
);
1328 spin_unlock(&sysctl_lock
);
1336 #ifdef CONFIG_PROC_FS
1338 /* Scan the sysctl entries in table and add them all into /proc */
1339 static void register_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
, void *set
)
1341 struct proc_dir_entry
*de
;
1345 for (; table
->ctl_name
; table
++) {
1346 /* Can't do anything without a proc name. */
1347 if (!table
->procname
)
1349 /* Maybe we can't do anything with it... */
1350 if (!table
->proc_handler
&& !table
->child
) {
1351 printk(KERN_WARNING
"SYSCTL: Can't register %s\n",
1356 len
= strlen(table
->procname
);
1360 if (table
->proc_handler
)
1364 for (de
= root
->subdir
; de
; de
= de
->next
) {
1365 if (proc_match(len
, table
->procname
, de
))
1368 /* If the subdir exists already, de is non-NULL */
1372 de
= create_proc_entry(table
->procname
, mode
, root
);
1376 de
->data
= (void *) table
;
1377 if (table
->proc_handler
)
1378 de
->proc_fops
= &proc_sys_file_operations
;
1381 if (de
->mode
& S_IFDIR
)
1382 register_proc_table(table
->child
, de
, set
);
1387 * Unregister a /proc sysctl table and any subdirectories.
1389 static void unregister_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
)
1391 struct proc_dir_entry
*de
;
1392 for (; table
->ctl_name
; table
++) {
1393 if (!(de
= table
->de
))
1395 if (de
->mode
& S_IFDIR
) {
1396 if (!table
->child
) {
1397 printk (KERN_ALERT
"Help - malformed sysctl tree on free\n");
1400 unregister_proc_table(table
->child
, de
);
1402 /* Don't unregister directories which still have entries.. */
1408 * In any case, mark the entry as goner; we'll keep it
1409 * around if it's busy, but we'll know to do nothing with
1410 * its fields. We are under sysctl_lock here.
1414 /* Don't unregister proc entries that are still being used.. */
1415 if (atomic_read(&de
->count
))
1419 remove_proc_entry(table
->procname
, root
);
1423 static ssize_t
do_rw_proc(int write
, struct file
* file
, char __user
* buf
,
1424 size_t count
, loff_t
*ppos
)
1427 struct proc_dir_entry
*de
= PDE(file
->f_dentry
->d_inode
);
1428 struct ctl_table
*table
;
1430 ssize_t error
= -ENOTDIR
;
1432 spin_lock(&sysctl_lock
);
1433 if (de
&& de
->data
&& use_table(de
->set
)) {
1435 * at that point we know that sysctl was not unregistered
1436 * and won't be until we finish
1438 spin_unlock(&sysctl_lock
);
1439 table
= (struct ctl_table
*) de
->data
;
1440 if (!table
|| !table
->proc_handler
)
1443 op
= (write
? 002 : 004);
1444 if (ctl_perm(table
, op
))
1447 /* careful: calling conventions are nasty here */
1449 error
= (*table
->proc_handler
)(table
, write
, file
,
1454 spin_lock(&sysctl_lock
);
1455 unuse_table(de
->set
);
1457 spin_unlock(&sysctl_lock
);
1461 static int proc_opensys(struct inode
*inode
, struct file
*file
)
1463 if (file
->f_mode
& FMODE_WRITE
) {
1465 * sysctl entries that are not writable,
1466 * are _NOT_ writable, capabilities or not.
1468 if (!(inode
->i_mode
& S_IWUSR
))
1475 static ssize_t
proc_readsys(struct file
* file
, char __user
* buf
,
1476 size_t count
, loff_t
*ppos
)
1478 return do_rw_proc(0, file
, buf
, count
, ppos
);
1481 static ssize_t
proc_writesys(struct file
* file
, const char __user
* buf
,
1482 size_t count
, loff_t
*ppos
)
1484 return do_rw_proc(1, file
, (char __user
*) buf
, count
, ppos
);
1488 * proc_dostring - read a string sysctl
1489 * @table: the sysctl table
1490 * @write: %TRUE if this is a write to the sysctl file
1491 * @filp: the file structure
1492 * @buffer: the user buffer
1493 * @lenp: the size of the user buffer
1494 * @ppos: file position
1496 * Reads/writes a string from/to the user buffer. If the kernel
1497 * buffer provided is not large enough to hold the string, the
1498 * string is truncated. The copied string is %NULL-terminated.
1499 * If the string is being read by the user process, it is copied
1500 * and a newline '\n' is added. It is truncated if the buffer is
1503 * Returns 0 on success.
1505 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
1506 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1512 if (!table
->data
|| !table
->maxlen
|| !*lenp
||
1513 (*ppos
&& !write
)) {
1521 while (len
< *lenp
) {
1522 if (get_user(c
, p
++))
1524 if (c
== 0 || c
== '\n')
1528 if (len
>= table
->maxlen
)
1529 len
= table
->maxlen
-1;
1530 if(copy_from_user(table
->data
, buffer
, len
))
1532 ((char *) table
->data
)[len
] = 0;
1535 len
= strlen(table
->data
);
1536 if (len
> table
->maxlen
)
1537 len
= table
->maxlen
;
1541 if(copy_to_user(buffer
, table
->data
, len
))
1544 if(put_user('\n', ((char __user
*) buffer
) + len
))
1555 * Special case of dostring for the UTS structure. This has locks
1556 * to observe. Should this be in kernel/sys.c ????
1559 static int proc_doutsstring(ctl_table
*table
, int write
, struct file
*filp
,
1560 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1565 down_read(&uts_sem
);
1566 r
=proc_dostring(table
,0,filp
,buffer
,lenp
, ppos
);
1569 down_write(&uts_sem
);
1570 r
=proc_dostring(table
,1,filp
,buffer
,lenp
, ppos
);
1576 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
1578 int write
, void *data
)
1581 *valp
= *negp
? -*lvalp
: *lvalp
;
1586 *lvalp
= (unsigned long)-val
;
1589 *lvalp
= (unsigned long)val
;
1595 static int do_proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1596 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
1597 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1598 int write
, void *data
),
1601 #define TMPBUFLEN 21
1602 int *i
, vleft
, first
=1, neg
, val
;
1606 char buf
[TMPBUFLEN
], *p
;
1607 char __user
*s
= buffer
;
1609 if (!table
->data
|| !table
->maxlen
|| !*lenp
||
1610 (*ppos
&& !write
)) {
1615 i
= (int *) table
->data
;
1616 vleft
= table
->maxlen
/ sizeof(*i
);
1620 conv
= do_proc_dointvec_conv
;
1622 for (; left
&& vleft
--; i
++, first
=0) {
1637 if (len
> sizeof(buf
) - 1)
1638 len
= sizeof(buf
) - 1;
1639 if (copy_from_user(buf
, s
, len
))
1643 if (*p
== '-' && left
> 1) {
1647 if (*p
< '0' || *p
> '9')
1650 lval
= simple_strtoul(p
, &p
, 0);
1653 if ((len
< left
) && *p
&& !isspace(*p
))
1660 if (conv(&neg
, &lval
, i
, 1, data
))
1667 if (conv(&neg
, &lval
, i
, 0, data
))
1670 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
1674 if(copy_to_user(s
, buf
, len
))
1681 if (!write
&& !first
&& left
) {
1682 if(put_user('\n', s
))
1689 if (get_user(c
, s
++))
1705 * proc_dointvec - read a vector of integers
1706 * @table: the sysctl table
1707 * @write: %TRUE if this is a write to the sysctl file
1708 * @filp: the file structure
1709 * @buffer: the user buffer
1710 * @lenp: the size of the user buffer
1711 * @ppos: file position
1713 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1714 * values from/to the user buffer, treated as an ASCII string.
1716 * Returns 0 on success.
1718 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1719 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1721 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1731 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
1733 int write
, void *data
)
1735 int op
= *(int *)data
;
1737 int val
= *negp
? -*lvalp
: *lvalp
;
1739 case OP_SET
: *valp
= val
; break;
1740 case OP_AND
: *valp
&= val
; break;
1741 case OP_OR
: *valp
|= val
; break;
1742 case OP_MAX
: if(*valp
< val
)
1745 case OP_MIN
: if(*valp
> val
)
1753 *lvalp
= (unsigned long)-val
;
1756 *lvalp
= (unsigned long)val
;
1763 * init may raise the set.
1766 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
1767 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1771 if (!capable(CAP_SYS_MODULE
)) {
1775 op
= (current
->pid
== 1) ? OP_SET
: OP_AND
;
1776 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1777 do_proc_dointvec_bset_conv
,&op
);
1780 struct do_proc_dointvec_minmax_conv_param
{
1785 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
1787 int write
, void *data
)
1789 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
1791 int val
= *negp
? -*lvalp
: *lvalp
;
1792 if ((param
->min
&& *param
->min
> val
) ||
1793 (param
->max
&& *param
->max
< val
))
1800 *lvalp
= (unsigned long)-val
;
1803 *lvalp
= (unsigned long)val
;
1810 * proc_dointvec_minmax - read a vector of integers with min/max values
1811 * @table: the sysctl table
1812 * @write: %TRUE if this is a write to the sysctl file
1813 * @filp: the file structure
1814 * @buffer: the user buffer
1815 * @lenp: the size of the user buffer
1816 * @ppos: file position
1818 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1819 * values from/to the user buffer, treated as an ASCII string.
1821 * This routine will ensure the values are within the range specified by
1822 * table->extra1 (min) and table->extra2 (max).
1824 * Returns 0 on success.
1826 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
1827 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1829 struct do_proc_dointvec_minmax_conv_param param
= {
1830 .min
= (int *) table
->extra1
,
1831 .max
= (int *) table
->extra2
,
1833 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
1834 do_proc_dointvec_minmax_conv
, ¶m
);
1837 static int do_proc_doulongvec_minmax(ctl_table
*table
, int write
,
1839 void __user
*buffer
,
1840 size_t *lenp
, loff_t
*ppos
,
1841 unsigned long convmul
,
1842 unsigned long convdiv
)
1844 #define TMPBUFLEN 21
1845 unsigned long *i
, *min
, *max
, val
;
1846 int vleft
, first
=1, neg
;
1848 char buf
[TMPBUFLEN
], *p
;
1849 char __user
*s
= buffer
;
1851 if (!table
->data
|| !table
->maxlen
|| !*lenp
||
1852 (*ppos
&& !write
)) {
1857 i
= (unsigned long *) table
->data
;
1858 min
= (unsigned long *) table
->extra1
;
1859 max
= (unsigned long *) table
->extra2
;
1860 vleft
= table
->maxlen
/ sizeof(unsigned long);
1863 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
1878 if (len
> TMPBUFLEN
-1)
1880 if (copy_from_user(buf
, s
, len
))
1884 if (*p
== '-' && left
> 1) {
1888 if (*p
< '0' || *p
> '9')
1890 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
1892 if ((len
< left
) && *p
&& !isspace(*p
))
1901 if ((min
&& val
< *min
) || (max
&& val
> *max
))
1908 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
1912 if(copy_to_user(s
, buf
, len
))
1919 if (!write
&& !first
&& left
) {
1920 if(put_user('\n', s
))
1927 if (get_user(c
, s
++))
1943 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1944 * @table: the sysctl table
1945 * @write: %TRUE if this is a write to the sysctl file
1946 * @filp: the file structure
1947 * @buffer: the user buffer
1948 * @lenp: the size of the user buffer
1949 * @ppos: file position
1951 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1952 * values from/to the user buffer, treated as an ASCII string.
1954 * This routine will ensure the values are within the range specified by
1955 * table->extra1 (min) and table->extra2 (max).
1957 * Returns 0 on success.
1959 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
1960 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1962 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
1966 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1967 * @table: the sysctl table
1968 * @write: %TRUE if this is a write to the sysctl file
1969 * @filp: the file structure
1970 * @buffer: the user buffer
1971 * @lenp: the size of the user buffer
1972 * @ppos: file position
1974 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1975 * values from/to the user buffer, treated as an ASCII string. The values
1976 * are treated as milliseconds, and converted to jiffies when they are stored.
1978 * This routine will ensure the values are within the range specified by
1979 * table->extra1 (min) and table->extra2 (max).
1981 * Returns 0 on success.
1983 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
1985 void __user
*buffer
,
1986 size_t *lenp
, loff_t
*ppos
)
1988 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
1989 lenp
, ppos
, HZ
, 1000l);
1993 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
1995 int write
, void *data
)
1998 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2004 lval
= (unsigned long)-val
;
2007 lval
= (unsigned long)val
;
2014 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2016 int write
, void *data
)
2019 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2025 lval
= (unsigned long)-val
;
2028 lval
= (unsigned long)val
;
2030 *lvalp
= jiffies_to_clock_t(lval
);
2035 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2037 int write
, void *data
)
2040 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2046 lval
= (unsigned long)-val
;
2049 lval
= (unsigned long)val
;
2051 *lvalp
= jiffies_to_msecs(lval
);
2057 * proc_dointvec_jiffies - read a vector of integers as seconds
2058 * @table: the sysctl table
2059 * @write: %TRUE if this is a write to the sysctl file
2060 * @filp: the file structure
2061 * @buffer: the user buffer
2062 * @lenp: the size of the user buffer
2063 * @ppos: file position
2065 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2066 * values from/to the user buffer, treated as an ASCII string.
2067 * The values read are assumed to be in seconds, and are converted into
2070 * Returns 0 on success.
2072 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2073 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2075 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2076 do_proc_dointvec_jiffies_conv
,NULL
);
2080 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2081 * @table: the sysctl table
2082 * @write: %TRUE if this is a write to the sysctl file
2083 * @filp: the file structure
2084 * @buffer: the user buffer
2085 * @lenp: the size of the user buffer
2086 * @ppos: pointer to the file position
2088 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2089 * values from/to the user buffer, treated as an ASCII string.
2090 * The values read are assumed to be in 1/USER_HZ seconds, and
2091 * are converted into jiffies.
2093 * Returns 0 on success.
2095 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2096 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2098 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2099 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2103 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2104 * @table: the sysctl table
2105 * @write: %TRUE if this is a write to the sysctl file
2106 * @filp: the file structure
2107 * @buffer: the user buffer
2108 * @lenp: the size of the user buffer
2109 * @ppos: file position
2110 * @ppos: the current position in the file
2112 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2113 * values from/to the user buffer, treated as an ASCII string.
2114 * The values read are assumed to be in 1/1000 seconds, and
2115 * are converted into jiffies.
2117 * Returns 0 on success.
2119 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2120 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2122 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2123 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2126 #else /* CONFIG_PROC_FS */
2128 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
2129 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2134 static int proc_doutsstring(ctl_table
*table
, int write
, struct file
*filp
,
2135 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2140 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2141 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2146 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
2147 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2152 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2153 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2158 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2159 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2164 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2165 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2170 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2171 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2176 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2177 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2182 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2184 void __user
*buffer
,
2185 size_t *lenp
, loff_t
*ppos
)
2191 #endif /* CONFIG_PROC_FS */
2195 * General sysctl support routines
2198 /* The generic string strategy routine: */
2199 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2200 void __user
*oldval
, size_t __user
*oldlenp
,
2201 void __user
*newval
, size_t newlen
, void **context
)
2203 if (!table
->data
|| !table
->maxlen
)
2206 if (oldval
&& oldlenp
) {
2208 if (get_user(bufsize
, oldlenp
))
2211 size_t len
= strlen(table
->data
), copied
;
2213 /* This shouldn't trigger for a well-formed sysctl */
2214 if (len
> table
->maxlen
)
2215 len
= table
->maxlen
;
2217 /* Copy up to a max of bufsize-1 bytes of the string */
2218 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2220 if (copy_to_user(oldval
, table
->data
, copied
) ||
2221 put_user(0, (char __user
*)(oldval
+ copied
)))
2223 if (put_user(len
, oldlenp
))
2227 if (newval
&& newlen
) {
2228 size_t len
= newlen
;
2229 if (len
> table
->maxlen
)
2230 len
= table
->maxlen
;
2231 if(copy_from_user(table
->data
, newval
, len
))
2233 if (len
== table
->maxlen
)
2235 ((char *) table
->data
)[len
] = 0;
2241 * This function makes sure that all of the integers in the vector
2242 * are between the minimum and maximum values given in the arrays
2243 * table->extra1 and table->extra2, respectively.
2245 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2246 void __user
*oldval
, size_t __user
*oldlenp
,
2247 void __user
*newval
, size_t newlen
, void **context
)
2250 if (newval
&& newlen
) {
2251 int __user
*vec
= (int __user
*) newval
;
2252 int *min
= (int *) table
->extra1
;
2253 int *max
= (int *) table
->extra2
;
2257 if (newlen
% sizeof(int) != 0)
2260 if (!table
->extra1
&& !table
->extra2
)
2263 if (newlen
> table
->maxlen
)
2264 newlen
= table
->maxlen
;
2265 length
= newlen
/ sizeof(int);
2267 for (i
= 0; i
< length
; i
++) {
2269 if (get_user(value
, vec
+ i
))
2271 if (min
&& value
< min
[i
])
2273 if (max
&& value
> max
[i
])
2280 /* Strategy function to convert jiffies to seconds */
2281 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2282 void __user
*oldval
, size_t __user
*oldlenp
,
2283 void __user
*newval
, size_t newlen
, void **context
)
2288 if (get_user(olen
, oldlenp
))
2290 if (olen
!=sizeof(int))
2293 if (put_user(*(int *)(table
->data
)/HZ
, (int __user
*)oldval
) ||
2294 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2297 if (newval
&& newlen
) {
2299 if (newlen
!= sizeof(int))
2301 if (get_user(new, (int __user
*)newval
))
2303 *(int *)(table
->data
) = new*HZ
;
2308 /* Strategy function to convert jiffies to seconds */
2309 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2310 void __user
*oldval
, size_t __user
*oldlenp
,
2311 void __user
*newval
, size_t newlen
, void **context
)
2316 if (get_user(olen
, oldlenp
))
2318 if (olen
!=sizeof(int))
2321 if (put_user(jiffies_to_msecs(*(int *)(table
->data
)), (int __user
*)oldval
) ||
2322 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2325 if (newval
&& newlen
) {
2327 if (newlen
!= sizeof(int))
2329 if (get_user(new, (int __user
*)newval
))
2331 *(int *)(table
->data
) = msecs_to_jiffies(new);
2336 #else /* CONFIG_SYSCTL */
2339 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2344 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2345 void __user
*oldval
, size_t __user
*oldlenp
,
2346 void __user
*newval
, size_t newlen
, void **context
)
2351 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2352 void __user
*oldval
, size_t __user
*oldlenp
,
2353 void __user
*newval
, size_t newlen
, void **context
)
2358 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2359 void __user
*oldval
, size_t __user
*oldlenp
,
2360 void __user
*newval
, size_t newlen
, void **context
)
2365 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2366 void __user
*oldval
, size_t __user
*oldlenp
,
2367 void __user
*newval
, size_t newlen
, void **context
)
2372 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
2373 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2378 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2379 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2384 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
2385 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2390 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2391 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2396 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2397 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2402 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2403 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2408 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2409 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2414 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2415 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2420 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2422 void __user
*buffer
,
2423 size_t *lenp
, loff_t
*ppos
)
2428 struct ctl_table_header
* register_sysctl_table(ctl_table
* table
,
2434 void unregister_sysctl_table(struct ctl_table_header
* table
)
2438 #endif /* CONFIG_SYSCTL */
2441 * No sense putting this after each symbol definition, twice,
2442 * exception granted :-)
2444 EXPORT_SYMBOL(proc_dointvec
);
2445 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2446 EXPORT_SYMBOL(proc_dointvec_minmax
);
2447 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2448 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2449 EXPORT_SYMBOL(proc_dostring
);
2450 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2451 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
2452 EXPORT_SYMBOL(register_sysctl_table
);
2453 EXPORT_SYMBOL(sysctl_intvec
);
2454 EXPORT_SYMBOL(sysctl_jiffies
);
2455 EXPORT_SYMBOL(sysctl_ms_jiffies
);
2456 EXPORT_SYMBOL(sysctl_string
);
2457 EXPORT_SYMBOL(unregister_sysctl_table
);