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/capability.h>
29 #include <linux/ctype.h>
30 #include <linux/utsname.h>
31 #include <linux/capability.h>
32 #include <linux/smp_lock.h>
33 #include <linux/init.h>
34 #include <linux/kernel.h>
35 #include <linux/kobject.h>
36 #include <linux/net.h>
37 #include <linux/sysrq.h>
38 #include <linux/highuid.h>
39 #include <linux/writeback.h>
40 #include <linux/hugetlb.h>
41 #include <linux/security.h>
42 #include <linux/initrd.h>
43 #include <linux/times.h>
44 #include <linux/limits.h>
45 #include <linux/dcache.h>
46 #include <linux/syscalls.h>
47 #include <linux/nfs_fs.h>
48 #include <linux/acpi.h>
50 #include <asm/uaccess.h>
51 #include <asm/processor.h>
53 extern int proc_nr_files(ctl_table *table, int write, struct file *filp,
54 void __user *buffer, size_t *lenp, loff_t *ppos);
56 #if defined(CONFIG_SYSCTL)
58 /* External variables not in a header file. */
60 extern int sysctl_overcommit_memory;
61 extern int sysctl_overcommit_ratio;
62 extern int sysctl_panic_on_oom;
63 extern int max_threads;
64 extern int sysrq_enabled;
65 extern int core_uses_pid;
66 extern int suid_dumpable;
67 extern char core_pattern[];
70 extern int min_free_kbytes;
71 extern int printk_ratelimit_jiffies;
72 extern int printk_ratelimit_burst;
73 extern int pid_max_min, pid_max_max;
74 extern int sysctl_drop_caches;
75 extern int percpu_pagelist_fraction;
76 extern int compat_log;
78 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
79 int unknown_nmi_panic;
80 extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
81 void __user *, size_t *, loff_t *);
84 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
85 static int maxolduid = 65535;
87 static int min_percpu_pagelist_fract = 8;
89 static int ngroups_max = NGROUPS_MAX;
92 extern char modprobe_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;
119 #ifdef CONFIG_MATHEMU
120 extern int sysctl_ieee_emulation_warnings;
122 extern int sysctl_userprocess_debug;
123 extern int spin_retry;
126 extern int sysctl_hz_timer;
128 #ifdef CONFIG_BSD_PROCESS_ACCT
129 extern int acct_parm[];
133 extern int no_unaligned_warning;
136 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
137 ctl_table *, void **);
138 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
139 void __user *buffer, size_t *lenp, loff_t *ppos);
141 static ctl_table root_table[];
142 static struct ctl_table_header root_table_header =
143 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
145 static ctl_table kern_table[];
146 static ctl_table vm_table[];
147 static ctl_table fs_table[];
148 static ctl_table debug_table[];
149 static ctl_table dev_table[];
150 extern ctl_table random_table[];
151 #ifdef CONFIG_UNIX98_PTYS
152 extern ctl_table pty_table[];
154 #ifdef CONFIG_INOTIFY_USER
155 extern ctl_table inotify_table[];
158 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
159 int sysctl_legacy_va_layout;
162 /* /proc declarations: */
164 #ifdef CONFIG_PROC_FS
166 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
167 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
168 static int proc_opensys(struct inode *, struct file *);
170 struct file_operations proc_sys_file_operations = {
171 .open = proc_opensys,
172 .read = proc_readsys,
173 .write = proc_writesys,
176 extern struct proc_dir_entry *proc_sys_root;
178 static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *);
179 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
182 /* The default sysctl tables: */
184 static ctl_table root_table[] = {
186 .ctl_name = CTL_KERN,
187 .procname = "kernel",
212 .ctl_name = CTL_DEBUG,
215 .child = debug_table,
227 static ctl_table kern_table[] = {
229 .ctl_name = KERN_OSTYPE,
230 .procname = "ostype",
231 .data = system_utsname.sysname,
232 .maxlen = sizeof(system_utsname.sysname),
234 .proc_handler = &proc_doutsstring,
235 .strategy = &sysctl_string,
238 .ctl_name = KERN_OSRELEASE,
239 .procname = "osrelease",
240 .data = system_utsname.release,
241 .maxlen = sizeof(system_utsname.release),
243 .proc_handler = &proc_doutsstring,
244 .strategy = &sysctl_string,
247 .ctl_name = KERN_VERSION,
248 .procname = "version",
249 .data = system_utsname.version,
250 .maxlen = sizeof(system_utsname.version),
252 .proc_handler = &proc_doutsstring,
253 .strategy = &sysctl_string,
256 .ctl_name = KERN_NODENAME,
257 .procname = "hostname",
258 .data = system_utsname.nodename,
259 .maxlen = sizeof(system_utsname.nodename),
261 .proc_handler = &proc_doutsstring,
262 .strategy = &sysctl_string,
265 .ctl_name = KERN_DOMAINNAME,
266 .procname = "domainname",
267 .data = system_utsname.domainname,
268 .maxlen = sizeof(system_utsname.domainname),
270 .proc_handler = &proc_doutsstring,
271 .strategy = &sysctl_string,
274 .ctl_name = KERN_PANIC,
276 .data = &panic_timeout,
277 .maxlen = sizeof(int),
279 .proc_handler = &proc_dointvec,
282 .ctl_name = KERN_CORE_USES_PID,
283 .procname = "core_uses_pid",
284 .data = &core_uses_pid,
285 .maxlen = sizeof(int),
287 .proc_handler = &proc_dointvec,
290 .ctl_name = KERN_CORE_PATTERN,
291 .procname = "core_pattern",
292 .data = core_pattern,
295 .proc_handler = &proc_dostring,
296 .strategy = &sysctl_string,
299 .ctl_name = KERN_TAINTED,
300 .procname = "tainted",
302 .maxlen = sizeof(int),
304 .proc_handler = &proc_dointvec,
307 .ctl_name = KERN_CAP_BSET,
308 .procname = "cap-bound",
310 .maxlen = sizeof(kernel_cap_t),
312 .proc_handler = &proc_dointvec_bset,
314 #ifdef CONFIG_BLK_DEV_INITRD
316 .ctl_name = KERN_REALROOTDEV,
317 .procname = "real-root-dev",
318 .data = &real_root_dev,
319 .maxlen = sizeof(int),
321 .proc_handler = &proc_dointvec,
326 .ctl_name = KERN_SPARC_REBOOT,
327 .procname = "reboot-cmd",
328 .data = reboot_command,
331 .proc_handler = &proc_dostring,
332 .strategy = &sysctl_string,
335 .ctl_name = KERN_SPARC_STOP_A,
336 .procname = "stop-a",
337 .data = &stop_a_enabled,
338 .maxlen = sizeof (int),
340 .proc_handler = &proc_dointvec,
343 .ctl_name = KERN_SPARC_SCONS_PWROFF,
344 .procname = "scons-poweroff",
345 .data = &scons_pwroff,
346 .maxlen = sizeof (int),
348 .proc_handler = &proc_dointvec,
353 .ctl_name = KERN_HPPA_PWRSW,
354 .procname = "soft-power",
355 .data = &pwrsw_enabled,
356 .maxlen = sizeof (int),
358 .proc_handler = &proc_dointvec,
361 .ctl_name = KERN_HPPA_UNALIGNED,
362 .procname = "unaligned-trap",
363 .data = &unaligned_enabled,
364 .maxlen = sizeof (int),
366 .proc_handler = &proc_dointvec,
370 .ctl_name = KERN_CTLALTDEL,
371 .procname = "ctrl-alt-del",
373 .maxlen = sizeof(int),
375 .proc_handler = &proc_dointvec,
378 .ctl_name = KERN_PRINTK,
379 .procname = "printk",
380 .data = &console_loglevel,
381 .maxlen = 4*sizeof(int),
383 .proc_handler = &proc_dointvec,
387 .ctl_name = KERN_MODPROBE,
388 .procname = "modprobe",
389 .data = &modprobe_path,
390 .maxlen = KMOD_PATH_LEN,
392 .proc_handler = &proc_dostring,
393 .strategy = &sysctl_string,
396 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
398 .ctl_name = KERN_HOTPLUG,
399 .procname = "hotplug",
400 .data = &uevent_helper,
401 .maxlen = UEVENT_HELPER_PATH_LEN,
403 .proc_handler = &proc_dostring,
404 .strategy = &sysctl_string,
407 #ifdef CONFIG_CHR_DEV_SG
409 .ctl_name = KERN_SG_BIG_BUFF,
410 .procname = "sg-big-buff",
411 .data = &sg_big_buff,
412 .maxlen = sizeof (int),
414 .proc_handler = &proc_dointvec,
417 #ifdef CONFIG_BSD_PROCESS_ACCT
419 .ctl_name = KERN_ACCT,
422 .maxlen = 3*sizeof(int),
424 .proc_handler = &proc_dointvec,
427 #ifdef CONFIG_SYSVIPC
429 .ctl_name = KERN_SHMMAX,
430 .procname = "shmmax",
432 .maxlen = sizeof (size_t),
434 .proc_handler = &proc_doulongvec_minmax,
437 .ctl_name = KERN_SHMALL,
438 .procname = "shmall",
440 .maxlen = sizeof (size_t),
442 .proc_handler = &proc_doulongvec_minmax,
445 .ctl_name = KERN_SHMMNI,
446 .procname = "shmmni",
448 .maxlen = sizeof (int),
450 .proc_handler = &proc_dointvec,
453 .ctl_name = KERN_MSGMAX,
454 .procname = "msgmax",
456 .maxlen = sizeof (int),
458 .proc_handler = &proc_dointvec,
461 .ctl_name = KERN_MSGMNI,
462 .procname = "msgmni",
464 .maxlen = sizeof (int),
466 .proc_handler = &proc_dointvec,
469 .ctl_name = KERN_MSGMNB,
470 .procname = "msgmnb",
472 .maxlen = sizeof (int),
474 .proc_handler = &proc_dointvec,
477 .ctl_name = KERN_SEM,
480 .maxlen = 4*sizeof (int),
482 .proc_handler = &proc_dointvec,
485 #ifdef CONFIG_MAGIC_SYSRQ
487 .ctl_name = KERN_SYSRQ,
489 .data = &sysrq_enabled,
490 .maxlen = sizeof (int),
492 .proc_handler = &proc_dointvec,
496 .ctl_name = KERN_CADPID,
497 .procname = "cad_pid",
499 .maxlen = sizeof (int),
501 .proc_handler = &proc_dointvec,
504 .ctl_name = KERN_MAX_THREADS,
505 .procname = "threads-max",
506 .data = &max_threads,
507 .maxlen = sizeof(int),
509 .proc_handler = &proc_dointvec,
512 .ctl_name = KERN_RANDOM,
513 .procname = "random",
515 .child = random_table,
517 #ifdef CONFIG_UNIX98_PTYS
519 .ctl_name = KERN_PTY,
526 .ctl_name = KERN_OVERFLOWUID,
527 .procname = "overflowuid",
528 .data = &overflowuid,
529 .maxlen = sizeof(int),
531 .proc_handler = &proc_dointvec_minmax,
532 .strategy = &sysctl_intvec,
533 .extra1 = &minolduid,
534 .extra2 = &maxolduid,
537 .ctl_name = KERN_OVERFLOWGID,
538 .procname = "overflowgid",
539 .data = &overflowgid,
540 .maxlen = sizeof(int),
542 .proc_handler = &proc_dointvec_minmax,
543 .strategy = &sysctl_intvec,
544 .extra1 = &minolduid,
545 .extra2 = &maxolduid,
548 #ifdef CONFIG_MATHEMU
550 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
551 .procname = "ieee_emulation_warnings",
552 .data = &sysctl_ieee_emulation_warnings,
553 .maxlen = sizeof(int),
555 .proc_handler = &proc_dointvec,
558 #ifdef CONFIG_NO_IDLE_HZ
560 .ctl_name = KERN_HZ_TIMER,
561 .procname = "hz_timer",
562 .data = &sysctl_hz_timer,
563 .maxlen = sizeof(int),
565 .proc_handler = &proc_dointvec,
569 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
570 .procname = "userprocess_debug",
571 .data = &sysctl_userprocess_debug,
572 .maxlen = sizeof(int),
574 .proc_handler = &proc_dointvec,
578 .ctl_name = KERN_PIDMAX,
579 .procname = "pid_max",
581 .maxlen = sizeof (int),
583 .proc_handler = &proc_dointvec_minmax,
584 .strategy = sysctl_intvec,
585 .extra1 = &pid_max_min,
586 .extra2 = &pid_max_max,
589 .ctl_name = KERN_PANIC_ON_OOPS,
590 .procname = "panic_on_oops",
591 .data = &panic_on_oops,
592 .maxlen = sizeof(int),
594 .proc_handler = &proc_dointvec,
597 .ctl_name = KERN_PRINTK_RATELIMIT,
598 .procname = "printk_ratelimit",
599 .data = &printk_ratelimit_jiffies,
600 .maxlen = sizeof(int),
602 .proc_handler = &proc_dointvec_jiffies,
603 .strategy = &sysctl_jiffies,
606 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
607 .procname = "printk_ratelimit_burst",
608 .data = &printk_ratelimit_burst,
609 .maxlen = sizeof(int),
611 .proc_handler = &proc_dointvec,
614 .ctl_name = KERN_NGROUPS_MAX,
615 .procname = "ngroups_max",
616 .data = &ngroups_max,
617 .maxlen = sizeof (int),
619 .proc_handler = &proc_dointvec,
621 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
623 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
624 .procname = "unknown_nmi_panic",
625 .data = &unknown_nmi_panic,
626 .maxlen = sizeof (int),
628 .proc_handler = &proc_unknown_nmi_panic,
631 #if defined(CONFIG_X86)
633 .ctl_name = KERN_BOOTLOADER_TYPE,
634 .procname = "bootloader_type",
635 .data = &bootloader_type,
636 .maxlen = sizeof (int),
638 .proc_handler = &proc_dointvec,
641 #if defined(CONFIG_MMU)
643 .ctl_name = KERN_RANDOMIZE,
644 .procname = "randomize_va_space",
645 .data = &randomize_va_space,
646 .maxlen = sizeof(int),
648 .proc_handler = &proc_dointvec,
651 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
653 .ctl_name = KERN_SPIN_RETRY,
654 .procname = "spin_retry",
656 .maxlen = sizeof (int),
658 .proc_handler = &proc_dointvec,
661 #ifdef CONFIG_ACPI_SLEEP
663 .ctl_name = KERN_ACPI_VIDEO_FLAGS,
664 .procname = "acpi_video_flags",
665 .data = &acpi_video_flags,
666 .maxlen = sizeof (unsigned long),
668 .proc_handler = &proc_doulongvec_minmax,
673 .ctl_name = KERN_IA64_UNALIGNED,
674 .procname = "ignore-unaligned-usertrap",
675 .data = &no_unaligned_warning,
676 .maxlen = sizeof (int),
678 .proc_handler = &proc_dointvec,
683 .ctl_name = KERN_COMPAT_LOG,
684 .procname = "compat-log",
686 .maxlen = sizeof (int),
688 .proc_handler = &proc_dointvec,
694 /* Constants for minimum and maximum testing in vm_table.
695 We use these as one-element integer vectors. */
697 static int one_hundred = 100;
700 static ctl_table vm_table[] = {
702 .ctl_name = VM_OVERCOMMIT_MEMORY,
703 .procname = "overcommit_memory",
704 .data = &sysctl_overcommit_memory,
705 .maxlen = sizeof(sysctl_overcommit_memory),
707 .proc_handler = &proc_dointvec,
710 .ctl_name = VM_PANIC_ON_OOM,
711 .procname = "panic_on_oom",
712 .data = &sysctl_panic_on_oom,
713 .maxlen = sizeof(sysctl_panic_on_oom),
715 .proc_handler = &proc_dointvec,
718 .ctl_name = VM_OVERCOMMIT_RATIO,
719 .procname = "overcommit_ratio",
720 .data = &sysctl_overcommit_ratio,
721 .maxlen = sizeof(sysctl_overcommit_ratio),
723 .proc_handler = &proc_dointvec,
726 .ctl_name = VM_PAGE_CLUSTER,
727 .procname = "page-cluster",
728 .data = &page_cluster,
729 .maxlen = sizeof(int),
731 .proc_handler = &proc_dointvec,
734 .ctl_name = VM_DIRTY_BACKGROUND,
735 .procname = "dirty_background_ratio",
736 .data = &dirty_background_ratio,
737 .maxlen = sizeof(dirty_background_ratio),
739 .proc_handler = &proc_dointvec_minmax,
740 .strategy = &sysctl_intvec,
742 .extra2 = &one_hundred,
745 .ctl_name = VM_DIRTY_RATIO,
746 .procname = "dirty_ratio",
747 .data = &vm_dirty_ratio,
748 .maxlen = sizeof(vm_dirty_ratio),
750 .proc_handler = &proc_dointvec_minmax,
751 .strategy = &sysctl_intvec,
753 .extra2 = &one_hundred,
756 .ctl_name = VM_DIRTY_WB_CS,
757 .procname = "dirty_writeback_centisecs",
758 .data = &dirty_writeback_interval,
759 .maxlen = sizeof(dirty_writeback_interval),
761 .proc_handler = &dirty_writeback_centisecs_handler,
764 .ctl_name = VM_DIRTY_EXPIRE_CS,
765 .procname = "dirty_expire_centisecs",
766 .data = &dirty_expire_interval,
767 .maxlen = sizeof(dirty_expire_interval),
769 .proc_handler = &proc_dointvec_userhz_jiffies,
772 .ctl_name = VM_NR_PDFLUSH_THREADS,
773 .procname = "nr_pdflush_threads",
774 .data = &nr_pdflush_threads,
775 .maxlen = sizeof nr_pdflush_threads,
776 .mode = 0444 /* read-only*/,
777 .proc_handler = &proc_dointvec,
780 .ctl_name = VM_SWAPPINESS,
781 .procname = "swappiness",
782 .data = &vm_swappiness,
783 .maxlen = sizeof(vm_swappiness),
785 .proc_handler = &proc_dointvec_minmax,
786 .strategy = &sysctl_intvec,
788 .extra2 = &one_hundred,
790 #ifdef CONFIG_HUGETLB_PAGE
792 .ctl_name = VM_HUGETLB_PAGES,
793 .procname = "nr_hugepages",
794 .data = &max_huge_pages,
795 .maxlen = sizeof(unsigned long),
797 .proc_handler = &hugetlb_sysctl_handler,
798 .extra1 = (void *)&hugetlb_zero,
799 .extra2 = (void *)&hugetlb_infinity,
802 .ctl_name = VM_HUGETLB_GROUP,
803 .procname = "hugetlb_shm_group",
804 .data = &sysctl_hugetlb_shm_group,
805 .maxlen = sizeof(gid_t),
807 .proc_handler = &proc_dointvec,
811 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
812 .procname = "lowmem_reserve_ratio",
813 .data = &sysctl_lowmem_reserve_ratio,
814 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
816 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
817 .strategy = &sysctl_intvec,
820 .ctl_name = VM_DROP_PAGECACHE,
821 .procname = "drop_caches",
822 .data = &sysctl_drop_caches,
823 .maxlen = sizeof(int),
825 .proc_handler = drop_caches_sysctl_handler,
826 .strategy = &sysctl_intvec,
829 .ctl_name = VM_MIN_FREE_KBYTES,
830 .procname = "min_free_kbytes",
831 .data = &min_free_kbytes,
832 .maxlen = sizeof(min_free_kbytes),
834 .proc_handler = &min_free_kbytes_sysctl_handler,
835 .strategy = &sysctl_intvec,
839 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
840 .procname = "percpu_pagelist_fraction",
841 .data = &percpu_pagelist_fraction,
842 .maxlen = sizeof(percpu_pagelist_fraction),
844 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
845 .strategy = &sysctl_intvec,
846 .extra1 = &min_percpu_pagelist_fract,
850 .ctl_name = VM_MAX_MAP_COUNT,
851 .procname = "max_map_count",
852 .data = &sysctl_max_map_count,
853 .maxlen = sizeof(sysctl_max_map_count),
855 .proc_handler = &proc_dointvec
859 .ctl_name = VM_LAPTOP_MODE,
860 .procname = "laptop_mode",
861 .data = &laptop_mode,
862 .maxlen = sizeof(laptop_mode),
864 .proc_handler = &proc_dointvec_jiffies,
865 .strategy = &sysctl_jiffies,
868 .ctl_name = VM_BLOCK_DUMP,
869 .procname = "block_dump",
871 .maxlen = sizeof(block_dump),
873 .proc_handler = &proc_dointvec,
874 .strategy = &sysctl_intvec,
878 .ctl_name = VM_VFS_CACHE_PRESSURE,
879 .procname = "vfs_cache_pressure",
880 .data = &sysctl_vfs_cache_pressure,
881 .maxlen = sizeof(sysctl_vfs_cache_pressure),
883 .proc_handler = &proc_dointvec,
884 .strategy = &sysctl_intvec,
887 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
889 .ctl_name = VM_LEGACY_VA_LAYOUT,
890 .procname = "legacy_va_layout",
891 .data = &sysctl_legacy_va_layout,
892 .maxlen = sizeof(sysctl_legacy_va_layout),
894 .proc_handler = &proc_dointvec,
895 .strategy = &sysctl_intvec,
901 .ctl_name = VM_SWAP_TOKEN_TIMEOUT,
902 .procname = "swap_token_timeout",
903 .data = &swap_token_default_timeout,
904 .maxlen = sizeof(swap_token_default_timeout),
906 .proc_handler = &proc_dointvec_jiffies,
907 .strategy = &sysctl_jiffies,
912 .ctl_name = VM_ZONE_RECLAIM_MODE,
913 .procname = "zone_reclaim_mode",
914 .data = &zone_reclaim_mode,
915 .maxlen = sizeof(zone_reclaim_mode),
917 .proc_handler = &proc_dointvec,
918 .strategy = &sysctl_intvec,
922 .ctl_name = VM_ZONE_RECLAIM_INTERVAL,
923 .procname = "zone_reclaim_interval",
924 .data = &zone_reclaim_interval,
925 .maxlen = sizeof(zone_reclaim_interval),
927 .proc_handler = &proc_dointvec_jiffies,
928 .strategy = &sysctl_jiffies,
933 .ctl_name = VM_VDSO_ENABLED,
934 .procname = "vdso_enabled",
935 .data = &vdso_enabled,
936 .maxlen = sizeof(vdso_enabled),
938 .proc_handler = &proc_dointvec,
939 .strategy = &sysctl_intvec,
946 static ctl_table fs_table[] = {
948 .ctl_name = FS_NRINODE,
949 .procname = "inode-nr",
950 .data = &inodes_stat,
951 .maxlen = 2*sizeof(int),
953 .proc_handler = &proc_dointvec,
956 .ctl_name = FS_STATINODE,
957 .procname = "inode-state",
958 .data = &inodes_stat,
959 .maxlen = 7*sizeof(int),
961 .proc_handler = &proc_dointvec,
964 .ctl_name = FS_NRFILE,
965 .procname = "file-nr",
967 .maxlen = 3*sizeof(int),
969 .proc_handler = &proc_nr_files,
972 .ctl_name = FS_MAXFILE,
973 .procname = "file-max",
974 .data = &files_stat.max_files,
975 .maxlen = sizeof(int),
977 .proc_handler = &proc_dointvec,
980 .ctl_name = FS_DENTRY,
981 .procname = "dentry-state",
982 .data = &dentry_stat,
983 .maxlen = 6*sizeof(int),
985 .proc_handler = &proc_dointvec,
988 .ctl_name = FS_OVERFLOWUID,
989 .procname = "overflowuid",
990 .data = &fs_overflowuid,
991 .maxlen = sizeof(int),
993 .proc_handler = &proc_dointvec_minmax,
994 .strategy = &sysctl_intvec,
995 .extra1 = &minolduid,
996 .extra2 = &maxolduid,
999 .ctl_name = FS_OVERFLOWGID,
1000 .procname = "overflowgid",
1001 .data = &fs_overflowgid,
1002 .maxlen = sizeof(int),
1004 .proc_handler = &proc_dointvec_minmax,
1005 .strategy = &sysctl_intvec,
1006 .extra1 = &minolduid,
1007 .extra2 = &maxolduid,
1010 .ctl_name = FS_LEASES,
1011 .procname = "leases-enable",
1012 .data = &leases_enable,
1013 .maxlen = sizeof(int),
1015 .proc_handler = &proc_dointvec,
1017 #ifdef CONFIG_DNOTIFY
1019 .ctl_name = FS_DIR_NOTIFY,
1020 .procname = "dir-notify-enable",
1021 .data = &dir_notify_enable,
1022 .maxlen = sizeof(int),
1024 .proc_handler = &proc_dointvec,
1029 .ctl_name = FS_LEASE_TIME,
1030 .procname = "lease-break-time",
1031 .data = &lease_break_time,
1032 .maxlen = sizeof(int),
1034 .proc_handler = &proc_dointvec,
1037 .ctl_name = FS_AIO_NR,
1038 .procname = "aio-nr",
1040 .maxlen = sizeof(aio_nr),
1042 .proc_handler = &proc_doulongvec_minmax,
1045 .ctl_name = FS_AIO_MAX_NR,
1046 .procname = "aio-max-nr",
1047 .data = &aio_max_nr,
1048 .maxlen = sizeof(aio_max_nr),
1050 .proc_handler = &proc_doulongvec_minmax,
1052 #ifdef CONFIG_INOTIFY_USER
1054 .ctl_name = FS_INOTIFY,
1055 .procname = "inotify",
1057 .child = inotify_table,
1062 .ctl_name = KERN_SETUID_DUMPABLE,
1063 .procname = "suid_dumpable",
1064 .data = &suid_dumpable,
1065 .maxlen = sizeof(int),
1067 .proc_handler = &proc_dointvec,
1072 static ctl_table debug_table[] = {
1076 static ctl_table dev_table[] = {
1080 extern void init_irq_proc (void);
1082 static DEFINE_SPINLOCK(sysctl_lock);
1084 /* called under sysctl_lock */
1085 static int use_table(struct ctl_table_header *p)
1087 if (unlikely(p->unregistering))
1093 /* called under sysctl_lock */
1094 static void unuse_table(struct ctl_table_header *p)
1097 if (unlikely(p->unregistering))
1098 complete(p->unregistering);
1101 /* called under sysctl_lock, will reacquire if has to wait */
1102 static void start_unregistering(struct ctl_table_header *p)
1105 * if p->used is 0, nobody will ever touch that entry again;
1106 * we'll eliminate all paths to it before dropping sysctl_lock
1108 if (unlikely(p->used)) {
1109 struct completion wait;
1110 init_completion(&wait);
1111 p->unregistering = &wait;
1112 spin_unlock(&sysctl_lock);
1113 wait_for_completion(&wait);
1114 spin_lock(&sysctl_lock);
1117 * do not remove from the list until nobody holds it; walking the
1118 * list in do_sysctl() relies on that.
1120 list_del_init(&p->ctl_entry);
1123 void __init sysctl_init(void)
1125 #ifdef CONFIG_PROC_FS
1126 register_proc_table(root_table, proc_sys_root, &root_table_header);
1131 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1132 void __user *newval, size_t newlen)
1134 struct list_head *tmp;
1135 int error = -ENOTDIR;
1137 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1141 if (!oldlenp || get_user(old_len, oldlenp))
1144 spin_lock(&sysctl_lock);
1145 tmp = &root_table_header.ctl_entry;
1147 struct ctl_table_header *head =
1148 list_entry(tmp, struct ctl_table_header, ctl_entry);
1149 void *context = NULL;
1151 if (!use_table(head))
1154 spin_unlock(&sysctl_lock);
1156 error = parse_table(name, nlen, oldval, oldlenp,
1157 newval, newlen, head->ctl_table,
1161 spin_lock(&sysctl_lock);
1163 if (error != -ENOTDIR)
1165 } while ((tmp = tmp->next) != &root_table_header.ctl_entry);
1166 spin_unlock(&sysctl_lock);
1170 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1172 struct __sysctl_args tmp;
1175 if (copy_from_user(&tmp, args, sizeof(tmp)))
1179 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1180 tmp.newval, tmp.newlen);
1186 * ctl_perm does NOT grant the superuser all rights automatically, because
1187 * some sysctl variables are readonly even to root.
1190 static int test_perm(int mode, int op)
1194 else if (in_egroup_p(0))
1196 if ((mode & op & 0007) == op)
1201 static inline int ctl_perm(ctl_table *table, int op)
1204 error = security_sysctl(table, op);
1207 return test_perm(table->mode, op);
1210 static int parse_table(int __user *name, int nlen,
1211 void __user *oldval, size_t __user *oldlenp,
1212 void __user *newval, size_t newlen,
1213 ctl_table *table, void **context)
1219 if (get_user(n, name))
1221 for ( ; table->ctl_name; table++) {
1222 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1225 if (ctl_perm(table, 001))
1227 if (table->strategy) {
1228 error = table->strategy(
1231 newval, newlen, context);
1237 table = table->child;
1240 error = do_sysctl_strategy(table, name, nlen,
1242 newval, newlen, context);
1249 /* Perform the actual read/write of a sysctl table entry. */
1250 int do_sysctl_strategy (ctl_table *table,
1251 int __user *name, int nlen,
1252 void __user *oldval, size_t __user *oldlenp,
1253 void __user *newval, size_t newlen, void **context)
1262 if (ctl_perm(table, op))
1265 if (table->strategy) {
1266 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1267 newval, newlen, context);
1274 /* If there is no strategy routine, or if the strategy returns
1275 * zero, proceed with automatic r/w */
1276 if (table->data && table->maxlen) {
1277 if (oldval && oldlenp) {
1278 if (get_user(len, oldlenp))
1281 if (len > table->maxlen)
1282 len = table->maxlen;
1283 if(copy_to_user(oldval, table->data, len))
1285 if(put_user(len, oldlenp))
1289 if (newval && newlen) {
1291 if (len > table->maxlen)
1292 len = table->maxlen;
1293 if(copy_from_user(table->data, newval, len))
1301 * register_sysctl_table - register a sysctl hierarchy
1302 * @table: the top-level table structure
1303 * @insert_at_head: whether the entry should be inserted in front or at the end
1305 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1306 * array. An entry with a ctl_name of 0 terminates the table.
1308 * The members of the &ctl_table structure are used as follows:
1310 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1311 * must be unique within that level of sysctl
1313 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1314 * enter a sysctl file
1316 * data - a pointer to data for use by proc_handler
1318 * maxlen - the maximum size in bytes of the data
1320 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1322 * child - a pointer to the child sysctl table if this entry is a directory, or
1325 * proc_handler - the text handler routine (described below)
1327 * strategy - the strategy routine (described below)
1329 * de - for internal use by the sysctl routines
1331 * extra1, extra2 - extra pointers usable by the proc handler routines
1333 * Leaf nodes in the sysctl tree will be represented by a single file
1334 * under /proc; non-leaf nodes will be represented by directories.
1336 * sysctl(2) can automatically manage read and write requests through
1337 * the sysctl table. The data and maxlen fields of the ctl_table
1338 * struct enable minimal validation of the values being written to be
1339 * performed, and the mode field allows minimal authentication.
1341 * More sophisticated management can be enabled by the provision of a
1342 * strategy routine with the table entry. This will be called before
1343 * any automatic read or write of the data is performed.
1345 * The strategy routine may return
1347 * < 0 - Error occurred (error is passed to user process)
1349 * 0 - OK - proceed with automatic read or write.
1351 * > 0 - OK - read or write has been done by the strategy routine, so
1352 * return immediately.
1354 * There must be a proc_handler routine for any terminal nodes
1355 * mirrored under /proc/sys (non-terminals are handled by a built-in
1356 * directory handler). Several default handlers are available to
1357 * cover common cases -
1359 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1360 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1361 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1363 * It is the handler's job to read the input buffer from user memory
1364 * and process it. The handler should return 0 on success.
1366 * This routine returns %NULL on a failure to register, and a pointer
1367 * to the table header on success.
1369 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1372 struct ctl_table_header *tmp;
1373 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1376 tmp->ctl_table = table;
1377 INIT_LIST_HEAD(&tmp->ctl_entry);
1379 tmp->unregistering = NULL;
1380 spin_lock(&sysctl_lock);
1382 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1384 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1385 spin_unlock(&sysctl_lock);
1386 #ifdef CONFIG_PROC_FS
1387 register_proc_table(table, proc_sys_root, tmp);
1393 * unregister_sysctl_table - unregister a sysctl table hierarchy
1394 * @header: the header returned from register_sysctl_table
1396 * Unregisters the sysctl table and all children. proc entries may not
1397 * actually be removed until they are no longer used by anyone.
1399 void unregister_sysctl_table(struct ctl_table_header * header)
1402 spin_lock(&sysctl_lock);
1403 start_unregistering(header);
1404 #ifdef CONFIG_PROC_FS
1405 unregister_proc_table(header->ctl_table, proc_sys_root);
1407 spin_unlock(&sysctl_lock);
1415 #ifdef CONFIG_PROC_FS
1417 /* Scan the sysctl entries in table and add them all into /proc */
1418 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set)
1420 struct proc_dir_entry *de;
1424 for (; table->ctl_name; table++) {
1425 /* Can't do anything without a proc name. */
1426 if (!table->procname)
1428 /* Maybe we can't do anything with it... */
1429 if (!table->proc_handler && !table->child) {
1430 printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1435 len = strlen(table->procname);
1439 if (table->proc_handler)
1443 for (de = root->subdir; de; de = de->next) {
1444 if (proc_match(len, table->procname, de))
1447 /* If the subdir exists already, de is non-NULL */
1451 de = create_proc_entry(table->procname, mode, root);
1455 de->data = (void *) table;
1456 if (table->proc_handler)
1457 de->proc_fops = &proc_sys_file_operations;
1460 if (de->mode & S_IFDIR)
1461 register_proc_table(table->child, de, set);
1466 * Unregister a /proc sysctl table and any subdirectories.
1468 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1470 struct proc_dir_entry *de;
1471 for (; table->ctl_name; table++) {
1472 if (!(de = table->de))
1474 if (de->mode & S_IFDIR) {
1475 if (!table->child) {
1476 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1479 unregister_proc_table(table->child, de);
1481 /* Don't unregister directories which still have entries.. */
1487 * In any case, mark the entry as goner; we'll keep it
1488 * around if it's busy, but we'll know to do nothing with
1489 * its fields. We are under sysctl_lock here.
1493 /* Don't unregister proc entries that are still being used.. */
1494 if (atomic_read(&de->count))
1498 remove_proc_entry(table->procname, root);
1502 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1503 size_t count, loff_t *ppos)
1506 struct proc_dir_entry *de = PDE(file->f_dentry->d_inode);
1507 struct ctl_table *table;
1509 ssize_t error = -ENOTDIR;
1511 spin_lock(&sysctl_lock);
1512 if (de && de->data && use_table(de->set)) {
1514 * at that point we know that sysctl was not unregistered
1515 * and won't be until we finish
1517 spin_unlock(&sysctl_lock);
1518 table = (struct ctl_table *) de->data;
1519 if (!table || !table->proc_handler)
1522 op = (write ? 002 : 004);
1523 if (ctl_perm(table, op))
1526 /* careful: calling conventions are nasty here */
1528 error = (*table->proc_handler)(table, write, file,
1533 spin_lock(&sysctl_lock);
1534 unuse_table(de->set);
1536 spin_unlock(&sysctl_lock);
1540 static int proc_opensys(struct inode *inode, struct file *file)
1542 if (file->f_mode & FMODE_WRITE) {
1544 * sysctl entries that are not writable,
1545 * are _NOT_ writable, capabilities or not.
1547 if (!(inode->i_mode & S_IWUSR))
1554 static ssize_t proc_readsys(struct file * file, char __user * buf,
1555 size_t count, loff_t *ppos)
1557 return do_rw_proc(0, file, buf, count, ppos);
1560 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1561 size_t count, loff_t *ppos)
1563 return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1567 * proc_dostring - read a string sysctl
1568 * @table: the sysctl table
1569 * @write: %TRUE if this is a write to the sysctl file
1570 * @filp: the file structure
1571 * @buffer: the user buffer
1572 * @lenp: the size of the user buffer
1573 * @ppos: file position
1575 * Reads/writes a string from/to the user buffer. If the kernel
1576 * buffer provided is not large enough to hold the string, the
1577 * string is truncated. The copied string is %NULL-terminated.
1578 * If the string is being read by the user process, it is copied
1579 * and a newline '\n' is added. It is truncated if the buffer is
1582 * Returns 0 on success.
1584 int proc_dostring(ctl_table *table, int write, struct file *filp,
1585 void __user *buffer, size_t *lenp, loff_t *ppos)
1591 if (!table->data || !table->maxlen || !*lenp ||
1592 (*ppos && !write)) {
1600 while (len < *lenp) {
1601 if (get_user(c, p++))
1603 if (c == 0 || c == '\n')
1607 if (len >= table->maxlen)
1608 len = table->maxlen-1;
1609 if(copy_from_user(table->data, buffer, len))
1611 ((char *) table->data)[len] = 0;
1614 len = strlen(table->data);
1615 if (len > table->maxlen)
1616 len = table->maxlen;
1620 if(copy_to_user(buffer, table->data, len))
1623 if(put_user('\n', ((char __user *) buffer) + len))
1634 * Special case of dostring for the UTS structure. This has locks
1635 * to observe. Should this be in kernel/sys.c ????
1638 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1639 void __user *buffer, size_t *lenp, loff_t *ppos)
1644 down_read(&uts_sem);
1645 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1648 down_write(&uts_sem);
1649 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1655 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1657 int write, void *data)
1660 *valp = *negp ? -*lvalp : *lvalp;
1665 *lvalp = (unsigned long)-val;
1668 *lvalp = (unsigned long)val;
1674 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1675 void __user *buffer, size_t *lenp, loff_t *ppos,
1676 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1677 int write, void *data),
1680 #define TMPBUFLEN 21
1681 int *i, vleft, first=1, neg, val;
1685 char buf[TMPBUFLEN], *p;
1686 char __user *s = buffer;
1688 if (!table->data || !table->maxlen || !*lenp ||
1689 (*ppos && !write)) {
1694 i = (int *) table->data;
1695 vleft = table->maxlen / sizeof(*i);
1699 conv = do_proc_dointvec_conv;
1701 for (; left && vleft--; i++, first=0) {
1716 if (len > sizeof(buf) - 1)
1717 len = sizeof(buf) - 1;
1718 if (copy_from_user(buf, s, len))
1722 if (*p == '-' && left > 1) {
1726 if (*p < '0' || *p > '9')
1729 lval = simple_strtoul(p, &p, 0);
1732 if ((len < left) && *p && !isspace(*p))
1739 if (conv(&neg, &lval, i, 1, data))
1746 if (conv(&neg, &lval, i, 0, data))
1749 sprintf(p, "%s%lu", neg ? "-" : "", lval);
1753 if(copy_to_user(s, buf, len))
1760 if (!write && !first && left) {
1761 if(put_user('\n', s))
1768 if (get_user(c, s++))
1784 * proc_dointvec - read a vector of integers
1785 * @table: the sysctl table
1786 * @write: %TRUE if this is a write to the sysctl file
1787 * @filp: the file structure
1788 * @buffer: the user buffer
1789 * @lenp: the size of the user buffer
1790 * @ppos: file position
1792 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1793 * values from/to the user buffer, treated as an ASCII string.
1795 * Returns 0 on success.
1797 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1798 void __user *buffer, size_t *lenp, loff_t *ppos)
1800 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1810 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1812 int write, void *data)
1814 int op = *(int *)data;
1816 int val = *negp ? -*lvalp : *lvalp;
1818 case OP_SET: *valp = val; break;
1819 case OP_AND: *valp &= val; break;
1820 case OP_OR: *valp |= val; break;
1821 case OP_MAX: if(*valp < val)
1824 case OP_MIN: if(*valp > val)
1832 *lvalp = (unsigned long)-val;
1835 *lvalp = (unsigned long)val;
1842 * init may raise the set.
1845 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1846 void __user *buffer, size_t *lenp, loff_t *ppos)
1850 if (!capable(CAP_SYS_MODULE)) {
1854 op = (current->pid == 1) ? OP_SET : OP_AND;
1855 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1856 do_proc_dointvec_bset_conv,&op);
1859 struct do_proc_dointvec_minmax_conv_param {
1864 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1866 int write, void *data)
1868 struct do_proc_dointvec_minmax_conv_param *param = data;
1870 int val = *negp ? -*lvalp : *lvalp;
1871 if ((param->min && *param->min > val) ||
1872 (param->max && *param->max < val))
1879 *lvalp = (unsigned long)-val;
1882 *lvalp = (unsigned long)val;
1889 * proc_dointvec_minmax - read a vector of integers with min/max values
1890 * @table: the sysctl table
1891 * @write: %TRUE if this is a write to the sysctl file
1892 * @filp: the file structure
1893 * @buffer: the user buffer
1894 * @lenp: the size of the user buffer
1895 * @ppos: file position
1897 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1898 * values from/to the user buffer, treated as an ASCII string.
1900 * This routine will ensure the values are within the range specified by
1901 * table->extra1 (min) and table->extra2 (max).
1903 * Returns 0 on success.
1905 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1906 void __user *buffer, size_t *lenp, loff_t *ppos)
1908 struct do_proc_dointvec_minmax_conv_param param = {
1909 .min = (int *) table->extra1,
1910 .max = (int *) table->extra2,
1912 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1913 do_proc_dointvec_minmax_conv, ¶m);
1916 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1918 void __user *buffer,
1919 size_t *lenp, loff_t *ppos,
1920 unsigned long convmul,
1921 unsigned long convdiv)
1923 #define TMPBUFLEN 21
1924 unsigned long *i, *min, *max, val;
1925 int vleft, first=1, neg;
1927 char buf[TMPBUFLEN], *p;
1928 char __user *s = buffer;
1930 if (!table->data || !table->maxlen || !*lenp ||
1931 (*ppos && !write)) {
1936 i = (unsigned long *) table->data;
1937 min = (unsigned long *) table->extra1;
1938 max = (unsigned long *) table->extra2;
1939 vleft = table->maxlen / sizeof(unsigned long);
1942 for (; left && vleft--; i++, min++, max++, first=0) {
1957 if (len > TMPBUFLEN-1)
1959 if (copy_from_user(buf, s, len))
1963 if (*p == '-' && left > 1) {
1967 if (*p < '0' || *p > '9')
1969 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1971 if ((len < left) && *p && !isspace(*p))
1980 if ((min && val < *min) || (max && val > *max))
1987 sprintf(p, "%lu", convdiv * (*i) / convmul);
1991 if(copy_to_user(s, buf, len))
1998 if (!write && !first && left) {
1999 if(put_user('\n', s))
2006 if (get_user(c, s++))
2022 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2023 * @table: the sysctl table
2024 * @write: %TRUE if this is a write to the sysctl file
2025 * @filp: the file structure
2026 * @buffer: the user buffer
2027 * @lenp: the size of the user buffer
2028 * @ppos: file position
2030 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2031 * values from/to the user buffer, treated as an ASCII string.
2033 * This routine will ensure the values are within the range specified by
2034 * table->extra1 (min) and table->extra2 (max).
2036 * Returns 0 on success.
2038 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2039 void __user *buffer, size_t *lenp, loff_t *ppos)
2041 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2045 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2046 * @table: the sysctl table
2047 * @write: %TRUE if this is a write to the sysctl file
2048 * @filp: the file structure
2049 * @buffer: the user buffer
2050 * @lenp: the size of the user buffer
2051 * @ppos: file position
2053 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2054 * values from/to the user buffer, treated as an ASCII string. The values
2055 * are treated as milliseconds, and converted to jiffies when they are stored.
2057 * This routine will ensure the values are within the range specified by
2058 * table->extra1 (min) and table->extra2 (max).
2060 * Returns 0 on success.
2062 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2064 void __user *buffer,
2065 size_t *lenp, loff_t *ppos)
2067 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2068 lenp, ppos, HZ, 1000l);
2072 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2074 int write, void *data)
2077 if (*lvalp > LONG_MAX / HZ)
2079 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2085 lval = (unsigned long)-val;
2088 lval = (unsigned long)val;
2095 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2097 int write, void *data)
2100 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2102 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2108 lval = (unsigned long)-val;
2111 lval = (unsigned long)val;
2113 *lvalp = jiffies_to_clock_t(lval);
2118 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2120 int write, void *data)
2123 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2129 lval = (unsigned long)-val;
2132 lval = (unsigned long)val;
2134 *lvalp = jiffies_to_msecs(lval);
2140 * proc_dointvec_jiffies - read a vector of integers as seconds
2141 * @table: the sysctl table
2142 * @write: %TRUE if this is a write to the sysctl file
2143 * @filp: the file structure
2144 * @buffer: the user buffer
2145 * @lenp: the size of the user buffer
2146 * @ppos: file position
2148 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2149 * values from/to the user buffer, treated as an ASCII string.
2150 * The values read are assumed to be in seconds, and are converted into
2153 * Returns 0 on success.
2155 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2156 void __user *buffer, size_t *lenp, loff_t *ppos)
2158 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2159 do_proc_dointvec_jiffies_conv,NULL);
2163 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2164 * @table: the sysctl table
2165 * @write: %TRUE if this is a write to the sysctl file
2166 * @filp: the file structure
2167 * @buffer: the user buffer
2168 * @lenp: the size of the user buffer
2169 * @ppos: pointer to the file position
2171 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2172 * values from/to the user buffer, treated as an ASCII string.
2173 * The values read are assumed to be in 1/USER_HZ seconds, and
2174 * are converted into jiffies.
2176 * Returns 0 on success.
2178 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2179 void __user *buffer, size_t *lenp, loff_t *ppos)
2181 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2182 do_proc_dointvec_userhz_jiffies_conv,NULL);
2186 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2187 * @table: the sysctl table
2188 * @write: %TRUE if this is a write to the sysctl file
2189 * @filp: the file structure
2190 * @buffer: the user buffer
2191 * @lenp: the size of the user buffer
2192 * @ppos: file position
2193 * @ppos: the current position in the file
2195 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2196 * values from/to the user buffer, treated as an ASCII string.
2197 * The values read are assumed to be in 1/1000 seconds, and
2198 * are converted into jiffies.
2200 * Returns 0 on success.
2202 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2203 void __user *buffer, size_t *lenp, loff_t *ppos)
2205 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2206 do_proc_dointvec_ms_jiffies_conv, NULL);
2209 #else /* CONFIG_PROC_FS */
2211 int proc_dostring(ctl_table *table, int write, struct file *filp,
2212 void __user *buffer, size_t *lenp, loff_t *ppos)
2217 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2218 void __user *buffer, size_t *lenp, loff_t *ppos)
2223 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2224 void __user *buffer, size_t *lenp, loff_t *ppos)
2229 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2230 void __user *buffer, size_t *lenp, loff_t *ppos)
2235 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2236 void __user *buffer, size_t *lenp, loff_t *ppos)
2241 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2242 void __user *buffer, size_t *lenp, loff_t *ppos)
2247 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2248 void __user *buffer, size_t *lenp, loff_t *ppos)
2253 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2254 void __user *buffer, size_t *lenp, loff_t *ppos)
2259 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2260 void __user *buffer, size_t *lenp, loff_t *ppos)
2265 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2267 void __user *buffer,
2268 size_t *lenp, loff_t *ppos)
2274 #endif /* CONFIG_PROC_FS */
2278 * General sysctl support routines
2281 /* The generic string strategy routine: */
2282 int sysctl_string(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)
2286 if (!table->data || !table->maxlen)
2289 if (oldval && oldlenp) {
2291 if (get_user(bufsize, oldlenp))
2294 size_t len = strlen(table->data), copied;
2296 /* This shouldn't trigger for a well-formed sysctl */
2297 if (len > table->maxlen)
2298 len = table->maxlen;
2300 /* Copy up to a max of bufsize-1 bytes of the string */
2301 copied = (len >= bufsize) ? bufsize - 1 : len;
2303 if (copy_to_user(oldval, table->data, copied) ||
2304 put_user(0, (char __user *)(oldval + copied)))
2306 if (put_user(len, oldlenp))
2310 if (newval && newlen) {
2311 size_t len = newlen;
2312 if (len > table->maxlen)
2313 len = table->maxlen;
2314 if(copy_from_user(table->data, newval, len))
2316 if (len == table->maxlen)
2318 ((char *) table->data)[len] = 0;
2324 * This function makes sure that all of the integers in the vector
2325 * are between the minimum and maximum values given in the arrays
2326 * table->extra1 and table->extra2, respectively.
2328 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2329 void __user *oldval, size_t __user *oldlenp,
2330 void __user *newval, size_t newlen, void **context)
2333 if (newval && newlen) {
2334 int __user *vec = (int __user *) newval;
2335 int *min = (int *) table->extra1;
2336 int *max = (int *) table->extra2;
2340 if (newlen % sizeof(int) != 0)
2343 if (!table->extra1 && !table->extra2)
2346 if (newlen > table->maxlen)
2347 newlen = table->maxlen;
2348 length = newlen / sizeof(int);
2350 for (i = 0; i < length; i++) {
2352 if (get_user(value, vec + i))
2354 if (min && value < min[i])
2356 if (max && value > max[i])
2363 /* Strategy function to convert jiffies to seconds */
2364 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2365 void __user *oldval, size_t __user *oldlenp,
2366 void __user *newval, size_t newlen, void **context)
2371 if (get_user(olen, oldlenp))
2373 if (olen!=sizeof(int))
2376 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2377 (oldlenp && put_user(sizeof(int),oldlenp)))
2380 if (newval && newlen) {
2382 if (newlen != sizeof(int))
2384 if (get_user(new, (int __user *)newval))
2386 *(int *)(table->data) = new*HZ;
2391 /* Strategy function to convert jiffies to seconds */
2392 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2393 void __user *oldval, size_t __user *oldlenp,
2394 void __user *newval, size_t newlen, void **context)
2399 if (get_user(olen, oldlenp))
2401 if (olen!=sizeof(int))
2404 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2405 (oldlenp && put_user(sizeof(int),oldlenp)))
2408 if (newval && newlen) {
2410 if (newlen != sizeof(int))
2412 if (get_user(new, (int __user *)newval))
2414 *(int *)(table->data) = msecs_to_jiffies(new);
2419 #else /* CONFIG_SYSCTL */
2422 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2427 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2428 void __user *oldval, size_t __user *oldlenp,
2429 void __user *newval, size_t newlen, void **context)
2434 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2435 void __user *oldval, size_t __user *oldlenp,
2436 void __user *newval, size_t newlen, void **context)
2441 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2442 void __user *oldval, size_t __user *oldlenp,
2443 void __user *newval, size_t newlen, void **context)
2448 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2449 void __user *oldval, size_t __user *oldlenp,
2450 void __user *newval, size_t newlen, void **context)
2455 int proc_dostring(ctl_table *table, int write, struct file *filp,
2456 void __user *buffer, size_t *lenp, loff_t *ppos)
2461 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2462 void __user *buffer, size_t *lenp, loff_t *ppos)
2467 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2468 void __user *buffer, size_t *lenp, loff_t *ppos)
2473 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2474 void __user *buffer, size_t *lenp, loff_t *ppos)
2479 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2480 void __user *buffer, size_t *lenp, loff_t *ppos)
2485 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2486 void __user *buffer, size_t *lenp, loff_t *ppos)
2491 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2492 void __user *buffer, size_t *lenp, loff_t *ppos)
2497 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2498 void __user *buffer, size_t *lenp, loff_t *ppos)
2503 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2505 void __user *buffer,
2506 size_t *lenp, loff_t *ppos)
2511 struct ctl_table_header * register_sysctl_table(ctl_table * table,
2517 void unregister_sysctl_table(struct ctl_table_header * table)
2521 #endif /* CONFIG_SYSCTL */
2524 * No sense putting this after each symbol definition, twice,
2525 * exception granted :-)
2527 EXPORT_SYMBOL(proc_dointvec);
2528 EXPORT_SYMBOL(proc_dointvec_jiffies);
2529 EXPORT_SYMBOL(proc_dointvec_minmax);
2530 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2531 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2532 EXPORT_SYMBOL(proc_dostring);
2533 EXPORT_SYMBOL(proc_doulongvec_minmax);
2534 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2535 EXPORT_SYMBOL(register_sysctl_table);
2536 EXPORT_SYMBOL(sysctl_intvec);
2537 EXPORT_SYMBOL(sysctl_jiffies);
2538 EXPORT_SYMBOL(sysctl_ms_jiffies);
2539 EXPORT_SYMBOL(sysctl_string);
2540 EXPORT_SYMBOL(unregister_sysctl_table);