kernel/sysctl.c

   1 /*
   2  * sysctl.c: General linux system control interface
   3  *
   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
  12  *  Horn.
  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
  16  *  Wendling.
  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
  19  */
  20
  21 #include <linux/config.h>
  22 #include <linux/module.h>
  23 #include <linux/mm.h>
  24 #include <linux/swap.h>
  25 #include <linux/slab.h>
  26 #include <linux/sysctl.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/capability.h>
  31 #include <linux/smp_lock.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/sysrq.h>
  35 #include <linux/highuid.h>
  36 #include <linux/writeback.h>
  37 #include <linux/hugetlb.h>
  38 #include <linux/security.h>
  39 #include <linux/initrd.h>
  40 #include <linux/times.h>
  41 #include <linux/limits.h>
  42 #include <linux/dcache.h>
  43
  44 #include <asm/uaccess.h>
  45
  46 #ifdef CONFIG_ROOT_NFS
  47 #include <linux/nfs_fs.h>
  48 #endif
  49
  50 #if defined(CONFIG_SYSCTL)
  51
  52 /* External variables not in a header file. */
  53 extern int panic_timeout;
  54 extern int C_A_D;
  55 extern int sysctl_overcommit_memory;
  56 extern int sysctl_overcommit_ratio;
  57 extern int max_threads;
  58 extern int sysrq_enabled;
  59 extern int core_uses_pid;
  60 extern char core_pattern[];
  61 extern int cad_pid;
  62 extern int pid_max;
  63 extern int sysctl_lower_zone_protection;
  64 extern int min_free_kbytes;
  65 extern int printk_ratelimit_jiffies;
  66 extern int printk_ratelimit_burst;
  67
  68 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
  69 static int maxolduid = 65535;
  70 static int minolduid;
  71
  72 static int ngroups_max = NGROUPS_MAX;
  73
  74 #ifdef CONFIG_KMOD
  75 extern char modprobe_path[];
  76 #endif
  77 #ifdef CONFIG_HOTPLUG
  78 extern char hotplug_path[];
  79 #endif
  80 extern char vshelper_path[];
  81 #ifdef CONFIG_CHR_DEV_SG
  82 extern int sg_big_buff;
  83 #endif
  84 #ifdef CONFIG_SYSVIPC
  85 extern size_t shm_ctlmax;
  86 extern size_t shm_ctlall;
  87 extern int shm_ctlmni;
  88 extern int msg_ctlmax;
  89 extern int msg_ctlmnb;
  90 extern int msg_ctlmni;
  91 extern int sem_ctls[];
  92 #endif
  93
  94 #ifdef __sparc__
  95 extern char reboot_command [];
  96 extern int stop_a_enabled;
  97 extern int scons_pwroff;
  98 #endif
  99
 100 #ifdef __hppa__
 101 extern int pwrsw_enabled;
 102 extern int unaligned_enabled;
 103 #endif
 104
 105 #ifdef CONFIG_ARCH_S390
 106 #ifdef CONFIG_MATHEMU
 107 extern int sysctl_ieee_emulation_warnings;
 108 #endif
 109 extern int sysctl_userprocess_debug;
 110 #endif
 111
 112 extern int sysctl_hz_timer;
 113
 114 #if defined(CONFIG_PPC32) && defined(CONFIG_6xx)
 115 extern unsigned long powersave_nap;
 116 int proc_dol2crvec(ctl_table *table, int write, struct file *filp,
 117                   void __user *buffer, size_t *lenp, loff_t *ppos);
 118 #endif
 119
 120 #ifdef CONFIG_BSD_PROCESS_ACCT
 121 extern int acct_parm[];
 122 #endif
 123
 124 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
 125                        ctl_table *, void **);
 126 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
 127                   void __user *buffer, size_t *lenp, loff_t *ppos);
 128
 129 static ctl_table root_table[];
 130 static struct ctl_table_header root_table_header =
 131         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
 132
 133 static ctl_table kern_table[];
 134 static ctl_table vm_table[];
 135 #ifdef CONFIG_NET
 136 extern ctl_table net_table[];
 137 #endif
 138 static ctl_table proc_table[];
 139 static ctl_table fs_table[];
 140 static ctl_table debug_table[];
 141 static ctl_table dev_table[];
 142 extern ctl_table random_table[];
 143 #ifdef CONFIG_UNIX98_PTYS
 144 extern ctl_table pty_table[];
 145 #endif
 146
 147 /* /proc declarations: */
 148
 149 #ifdef CONFIG_PROC_FS
 150
 151 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
 152 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
 153 static int proc_opensys(struct inode *, struct file *);
 154
 155 struct file_operations proc_sys_file_operations = {
 156         .open           = proc_opensys,
 157         .read           = proc_readsys,
 158         .write          = proc_writesys,
 159 };
 160
 161 extern struct proc_dir_entry *proc_sys_root;
 162
 163 static void register_proc_table(ctl_table *, struct proc_dir_entry *);
 164 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
 165 #endif
 166
 167 /* The default sysctl tables: */
 168
 169 static ctl_table root_table[] = {
 170         {
 171                 .ctl_name       = CTL_KERN,
 172                 .procname       = "kernel",
 173                 .mode           = 0555,
 174                 .child          = kern_table,
 175         },
 176         {
 177                 .ctl_name       = CTL_VM,
 178                 .procname       = "vm",
 179                 .mode           = 0555,
 180                 .child          = vm_table,
 181         },
 182 #ifdef CONFIG_NET
 183         {
 184                 .ctl_name       = CTL_NET,
 185                 .procname       = "net",
 186                 .mode           = 0555,
 187                 .child          = net_table,
 188         },
 189 #endif
 190         {
 191                 .ctl_name       = CTL_PROC,
 192                 .procname       = "proc",
 193                 .mode           = 0555,
 194                 .child          = proc_table,
 195         },
 196         {
 197                 .ctl_name       = CTL_FS,
 198                 .procname       = "fs",
 199                 .mode           = 0555,
 200                 .child          = fs_table,
 201         },
 202         {
 203                 .ctl_name       = CTL_DEBUG,
 204                 .procname       = "debug",
 205                 .mode           = 0555,
 206                 .child          = debug_table,
 207         },
 208         {
 209                 .ctl_name       = CTL_DEV,
 210                 .procname       = "dev",
 211                 .mode           = 0555,
 212                 .child          = dev_table,
 213         },
 214         { .ctl_name = 0 }
 215 };
 216
 217 static ctl_table kern_table[] = {
 218         {
 219                 .ctl_name       = KERN_OSTYPE,
 220                 .procname       = "ostype",
 221                 .data           = system_utsname.sysname,
 222                 .maxlen         = sizeof(system_utsname.sysname),
 223                 .mode           = 0444,
 224                 .proc_handler   = &proc_doutsstring,
 225                 .strategy       = &sysctl_string,
 226         },
 227         {
 228                 .ctl_name       = KERN_OSRELEASE,
 229                 .procname       = "osrelease",
 230                 .data           = system_utsname.release,
 231                 .maxlen         = sizeof(system_utsname.release),
 232                 .mode           = 0444,
 233                 .proc_handler   = &proc_doutsstring,
 234                 .strategy       = &sysctl_string,
 235         },
 236         {
 237                 .ctl_name       = KERN_VERSION,
 238                 .procname       = "version",
 239                 .data           = system_utsname.version,
 240                 .maxlen         = sizeof(system_utsname.version),
 241                 .mode           = 0444,
 242                 .proc_handler   = &proc_doutsstring,
 243                 .strategy       = &sysctl_string,
 244         },
 245         {
 246                 .ctl_name       = KERN_NODENAME,
 247                 .procname       = "hostname",
 248                 .data           = system_utsname.nodename,
 249                 .maxlen         = sizeof(system_utsname.nodename),
 250                 .mode           = 0644,
 251                 .proc_handler   = &proc_doutsstring,
 252                 .strategy       = &sysctl_string,
 253         },
 254         {
 255                 .ctl_name       = KERN_DOMAINNAME,
 256                 .procname       = "domainname",
 257                 .data           = system_utsname.domainname,
 258                 .maxlen         = sizeof(system_utsname.domainname),
 259                 .mode           = 0644,
 260                 .proc_handler   = &proc_doutsstring,
 261                 .strategy       = &sysctl_string,
 262         },
 263         {
 264                 .ctl_name       = KERN_PANIC,
 265                 .procname       = "panic",
 266                 .data           = &panic_timeout,
 267                 .maxlen         = sizeof(int),
 268                 .mode           = 0644,
 269                 .proc_handler   = &proc_dointvec,
 270         },
 271         {
 272                 .ctl_name       = KERN_CORE_USES_PID,
 273                 .procname       = "core_uses_pid",
 274                 .data           = &core_uses_pid,
 275                 .maxlen         = sizeof(int),
 276                 .mode           = 0644,
 277                 .proc_handler   = &proc_dointvec,
 278         },
 279         {
 280                 .ctl_name       = KERN_CORE_PATTERN,
 281                 .procname       = "core_pattern",
 282                 .data           = core_pattern,
 283                 .maxlen         = 64,
 284                 .mode           = 0644,
 285                 .proc_handler   = &proc_dostring,
 286                 .strategy       = &sysctl_string,
 287         },
 288         {
 289                 .ctl_name       = KERN_TAINTED,
 290                 .procname       = "tainted",
 291                 .data           = &tainted,
 292                 .maxlen         = sizeof(int),
 293                 .mode           = 0644,
 294                 .proc_handler   = &proc_dointvec,
 295         },
 296         {
 297                 .ctl_name       = KERN_CAP_BSET,
 298                 .procname       = "cap-bound",
 299                 .data           = &cap_bset,
 300                 .maxlen         = sizeof(kernel_cap_t),
 301                 .mode           = 0600,
 302                 .proc_handler   = &proc_dointvec_bset,
 303         },
 304 #ifdef CONFIG_BLK_DEV_INITRD
 305         {
 306                 .ctl_name       = KERN_REALROOTDEV,
 307                 .procname       = "real-root-dev",
 308                 .data           = &real_root_dev,
 309                 .maxlen         = sizeof(int),
 310                 .mode           = 0644,
 311                 .proc_handler   = &proc_dointvec,
 312         },
 313 #endif
 314 #ifdef __sparc__
 315         {
 316                 .ctl_name       = KERN_SPARC_REBOOT,
 317                 .procname       = "reboot-cmd",
 318                 .data           = reboot_command,
 319                 .maxlen         = 256,
 320                 .mode           = 0644,
 321                 .proc_handler   = &proc_dostring,
 322                 .strategy       = &sysctl_string,
 323         },
 324         {
 325                 .ctl_name       = KERN_SPARC_STOP_A,
 326                 .procname       = "stop-a",
 327                 .data           = &stop_a_enabled,
 328                 .maxlen         = sizeof (int),
 329                 .mode           = 0644,
 330                 .proc_handler   = &proc_dointvec,
 331         },
 332         {
 333                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
 334                 .procname       = "scons-poweroff",
 335                 .data           = &scons_pwroff,
 336                 .maxlen         = sizeof (int),
 337                 .mode           = 0644,
 338                 .proc_handler   = &proc_dointvec,
 339         },
 340 #endif
 341 #ifdef __hppa__
 342         {
 343                 .ctl_name       = KERN_HPPA_PWRSW,
 344                 .procname       = "soft-power",
 345                 .data           = &pwrsw_enabled,
 346                 .maxlen         = sizeof (int),
 347                 .mode           = 0644,
 348                 .proc_handler   = &proc_dointvec,
 349         },
 350         {
 351                 .ctl_name       = KERN_HPPA_UNALIGNED,
 352                 .procname       = "unaligned-trap",
 353                 .data           = &unaligned_enabled,
 354                 .maxlen         = sizeof (int),
 355                 .mode           = 0644,
 356                 .proc_handler   = &proc_dointvec,
 357         },
 358 #endif
 359 #if defined(CONFIG_PPC32) && defined(CONFIG_6xx)
 360         {
 361                 .ctl_name       = KERN_PPC_POWERSAVE_NAP,
 362                 .procname       = "powersave-nap",
 363                 .data           = &powersave_nap,
 364                 .maxlen         = sizeof(int),
 365                 .mode           = 0644,
 366                 .proc_handler   = &proc_dointvec,
 367         },
 368         {
 369                 .ctl_name       = KERN_PPC_L2CR,
 370                 .procname       = "l2cr",
 371                 .mode           = 0644,
 372                 .proc_handler   = &proc_dol2crvec,
 373         },
 374 #endif
 375         {
 376                 .ctl_name       = KERN_CTLALTDEL,
 377                 .procname       = "ctrl-alt-del",
 378                 .data           = &C_A_D,
 379                 .maxlen         = sizeof(int),
 380                 .mode           = 0644,
 381                 .proc_handler   = &proc_dointvec,
 382         },
 383         {
 384                 .ctl_name       = KERN_PRINTK,
 385                 .procname       = "printk",
 386                 .data           = &console_loglevel,
 387                 .maxlen         = 4*sizeof(int),
 388                 .mode           = 0644,
 389                 .proc_handler   = &proc_dointvec,
 390         },
 391 #ifdef CONFIG_KMOD
 392         {
 393                 .ctl_name       = KERN_MODPROBE,
 394                 .procname       = "modprobe",
 395                 .data           = &modprobe_path,
 396                 .maxlen         = KMOD_PATH_LEN,
 397                 .mode           = 0644,
 398                 .proc_handler   = &proc_dostring,
 399                 .strategy       = &sysctl_string,
 400         },
 401 #endif
 402 #ifdef CONFIG_HOTPLUG
 403         {
 404                 .ctl_name       = KERN_HOTPLUG,
 405                 .procname       = "hotplug",
 406                 .data           = &hotplug_path,
 407                 .maxlen         = KMOD_PATH_LEN,
 408                 .mode           = 0644,
 409                 .proc_handler   = &proc_dostring,
 410                 .strategy       = &sysctl_string,
 411         },
 412 #endif
 413         {
 414                 .ctl_name       = KERN_VSHELPER,
 415                 .procname       = "vshelper",
 416                 .data           = &vshelper_path,
 417                 .maxlen         = 256,
 418                 .mode           = 0644,
 419                 .proc_handler   = &proc_dostring,
 420                 .strategy       = &sysctl_string,
 421         },
 422 #ifdef CONFIG_CHR_DEV_SG
 423         {
 424                 .ctl_name       = KERN_SG_BIG_BUFF,
 425                 .procname       = "sg-big-buff",
 426                 .data           = &sg_big_buff,
 427                 .maxlen         = sizeof (int),
 428                 .mode           = 0444,
 429                 .proc_handler   = &proc_dointvec,
 430         },
 431 #endif
 432 #ifdef CONFIG_BSD_PROCESS_ACCT
 433         {
 434                 .ctl_name       = KERN_ACCT,
 435                 .procname       = "acct",
 436                 .data           = &acct_parm,
 437                 .maxlen         = 3*sizeof(int),
 438                 .mode           = 0644,
 439                 .proc_handler   = &proc_dointvec,
 440         },
 441 #endif
 442 #ifdef CONFIG_SYSVIPC
 443         {
 444                 .ctl_name       = KERN_SHMMAX,
 445                 .procname       = "shmmax",
 446                 .data           = &shm_ctlmax,
 447                 .maxlen         = sizeof (size_t),
 448                 .mode           = 0644,
 449                 .proc_handler   = &proc_doulongvec_minmax,
 450         },
 451         {
 452                 .ctl_name       = KERN_SHMALL,
 453                 .procname       = "shmall",
 454                 .data           = &shm_ctlall,
 455                 .maxlen         = sizeof (size_t),
 456                 .mode           = 0644,
 457                 .proc_handler   = &proc_doulongvec_minmax,
 458         },
 459         {
 460                 .ctl_name       = KERN_SHMMNI,
 461                 .procname       = "shmmni",
 462                 .data           = &shm_ctlmni,
 463                 .maxlen         = sizeof (int),
 464                 .mode           = 0644,
 465                 .proc_handler   = &proc_dointvec,
 466         },
 467         {
 468                 .ctl_name       = KERN_MSGMAX,
 469                 .procname       = "msgmax",
 470                 .data           = &msg_ctlmax,
 471                 .maxlen         = sizeof (int),
 472                 .mode           = 0644,
 473                 .proc_handler   = &proc_dointvec,
 474         },
 475         {
 476                 .ctl_name       = KERN_MSGMNI,
 477                 .procname       = "msgmni",
 478                 .data           = &msg_ctlmni,
 479                 .maxlen         = sizeof (int),
 480                 .mode           = 0644,
 481                 .proc_handler   = &proc_dointvec,
 482         },
 483         {
 484                 .ctl_name       = KERN_MSGMNB,
 485                 .procname       =  "msgmnb",
 486                 .data           = &msg_ctlmnb,
 487                 .maxlen         = sizeof (int),
 488                 .mode           = 0644,
 489                 .proc_handler   = &proc_dointvec,
 490         },
 491         {
 492                 .ctl_name       = KERN_SEM,
 493                 .procname       = "sem",
 494                 .data           = &sem_ctls,
 495                 .maxlen         = 4*sizeof (int),
 496                 .mode           = 0644,
 497                 .proc_handler   = &proc_dointvec,
 498         },
 499 #endif
 500 #ifdef CONFIG_MAGIC_SYSRQ
 501         {
 502                 .ctl_name       = KERN_SYSRQ,
 503                 .procname       = "sysrq",
 504                 .data           = &sysrq_enabled,
 505                 .maxlen         = sizeof (int),
 506                 .mode           = 0644,
 507                 .proc_handler   = &proc_dointvec,
 508         },
 509 #endif
 510         {
 511                 .ctl_name       = KERN_CADPID,
 512                 .procname       = "cad_pid",
 513                 .data           = &cad_pid,
 514                 .maxlen         = sizeof (int),
 515                 .mode           = 0600,
 516                 .proc_handler   = &proc_dointvec,
 517         },
 518         {
 519                 .ctl_name       = KERN_MAX_THREADS,
 520                 .procname       = "threads-max",
 521                 .data           = &max_threads,
 522                 .maxlen         = sizeof(int),
 523                 .mode           = 0644,
 524                 .proc_handler   = &proc_dointvec,
 525         },
 526         {
 527                 .ctl_name       = KERN_RANDOM,
 528                 .procname       = "random",
 529                 .mode           = 0555,
 530                 .child          = random_table,
 531         },
 532 #ifdef CONFIG_UNIX98_PTYS
 533         {
 534                 .ctl_name       = KERN_PTY,
 535                 .procname       = "pty",
 536                 .mode           = 0555,
 537                 .child          = pty_table,
 538         },
 539 #endif
 540         {
 541                 .ctl_name       = KERN_OVERFLOWUID,
 542                 .procname       = "overflowuid",
 543                 .data           = &overflowuid,
 544                 .maxlen         = sizeof(int),
 545                 .mode           = 0644,
 546                 .proc_handler   = &proc_dointvec_minmax,
 547                 .strategy       = &sysctl_intvec,
 548                 .extra1         = &minolduid,
 549                 .extra2         = &maxolduid,
 550         },
 551         {
 552                 .ctl_name       = KERN_OVERFLOWGID,
 553                 .procname       = "overflowgid",
 554                 .data           = &overflowgid,
 555                 .maxlen         = sizeof(int),
 556                 .mode           = 0644,
 557                 .proc_handler   = &proc_dointvec_minmax,
 558                 .strategy       = &sysctl_intvec,
 559                 .extra1         = &minolduid,
 560                 .extra2         = &maxolduid,
 561         },
 562 #ifdef CONFIG_ARCH_S390
 563 #ifdef CONFIG_MATHEMU
 564         {
 565                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
 566                 .procname       = "ieee_emulation_warnings",
 567                 .data           = &sysctl_ieee_emulation_warnings,
 568                 .maxlen         = sizeof(int),
 569                 .mode           = 0644,
 570                 .proc_handler   = &proc_dointvec,
 571         },
 572 #endif
 573 #ifdef CONFIG_NO_IDLE_HZ
 574         {
 575                 .ctl_name       = KERN_HZ_TIMER,
 576                 .procname       = "hz_timer",
 577                 .data           = &sysctl_hz_timer,
 578                 .maxlen         = sizeof(int),
 579                 .mode           = 0644,
 580                 .proc_handler   = &proc_dointvec,
 581         },
 582 #endif
 583         {
 584                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
 585                 .procname       = "userprocess_debug",
 586                 .data           = &sysctl_userprocess_debug,
 587                 .maxlen         = sizeof(int),
 588                 .mode           = 0644,
 589                 .proc_handler   = &proc_dointvec,
 590         },
 591 #endif
 592         {
 593                 .ctl_name       = KERN_PIDMAX,
 594                 .procname       = "pid_max",
 595                 .data           = &pid_max,
 596                 .maxlen         = sizeof (int),
 597                 .mode           = 0644,
 598                 .proc_handler   = &proc_dointvec,
 599         },
 600         {
 601                 .ctl_name       = KERN_PANIC_ON_OOPS,
 602                 .procname       = "panic_on_oops",
 603                 .data           = &panic_on_oops,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = &proc_dointvec,
 607         },
 608         {
 609                 .ctl_name       = KERN_PRINTK_RATELIMIT,
 610                 .procname       = "printk_ratelimit",
 611                 .data           = &printk_ratelimit_jiffies,
 612                 .maxlen         = sizeof(int),
 613                 .mode           = 0644,
 614                 .proc_handler   = &proc_dointvec_jiffies,
 615                 .strategy       = &sysctl_jiffies,
 616         },
 617         {
 618                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
 619                 .procname       = "printk_ratelimit_burst",
 620                 .data           = &printk_ratelimit_burst,
 621                 .maxlen         = sizeof(int),
 622                 .mode           = 0644,
 623                 .proc_handler   = &proc_dointvec,
 624         },
 625         {
 626                 .ctl_name       = KERN_NGROUPS_MAX,
 627                 .procname       = "ngroups_max",
 628                 .data           = &ngroups_max,
 629                 .maxlen         = sizeof (int),
 630                 .mode           = 0444,
 631                 .proc_handler   = &proc_dointvec,
 632         },
 633         { .ctl_name = 0 }
 634 };
 635
 636 /* Constants for minimum and maximum testing in vm_table.
 637    We use these as one-element integer vectors. */
 638 static int zero;
 639 static int one_hundred = 100;
 640
 641
 642 static ctl_table vm_table[] = {
 643         {
 644                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
 645                 .procname       = "overcommit_memory",
 646                 .data           = &sysctl_overcommit_memory,
 647                 .maxlen         = sizeof(sysctl_overcommit_memory),
 648                 .mode           = 0644,
 649                 .proc_handler   = &proc_dointvec,
 650         },
 651         {
 652                 .ctl_name       = VM_OVERCOMMIT_RATIO,
 653                 .procname       = "overcommit_ratio",
 654                 .data           = &sysctl_overcommit_ratio,
 655                 .maxlen         = sizeof(sysctl_overcommit_ratio),
 656                 .mode           = 0644,
 657                 .proc_handler   = &proc_dointvec,
 658         },
 659         {
 660                 .ctl_name       = VM_PAGE_CLUSTER,
 661                 .procname       = "page-cluster",
 662                 .data           = &page_cluster,
 663                 .maxlen         = sizeof(int),
 664                 .mode           = 0644,
 665                 .proc_handler   = &proc_dointvec,
 666         },
 667         {
 668                 .ctl_name       = VM_DIRTY_BACKGROUND,
 669                 .procname       = "dirty_background_ratio",
 670                 .data           = &dirty_background_ratio,
 671                 .maxlen         = sizeof(dirty_background_ratio),
 672                 .mode           = 0644,
 673                 .proc_handler   = &proc_dointvec_minmax,
 674                 .strategy       = &sysctl_intvec,
 675                 .extra1         = &zero,
 676                 .extra2         = &one_hundred,
 677         },
 678         {
 679                 .ctl_name       = VM_DIRTY_RATIO,
 680                 .procname       = "dirty_ratio",
 681                 .data           = &vm_dirty_ratio,
 682                 .maxlen         = sizeof(vm_dirty_ratio),
 683                 .mode           = 0644,
 684                 .proc_handler   = &proc_dointvec_minmax,
 685                 .strategy       = &sysctl_intvec,
 686                 .extra1         = &zero,
 687                 .extra2         = &one_hundred,
 688         },
 689         {
 690                 .ctl_name       = VM_DIRTY_WB_CS,
 691                 .procname       = "dirty_writeback_centisecs",
 692                 .data           = &dirty_writeback_centisecs,
 693                 .maxlen         = sizeof(dirty_writeback_centisecs),
 694                 .mode           = 0644,
 695                 .proc_handler   = &dirty_writeback_centisecs_handler,
 696         },
 697         {
 698                 .ctl_name       = VM_DIRTY_EXPIRE_CS,
 699                 .procname       = "dirty_expire_centisecs",
 700                 .data           = &dirty_expire_centisecs,
 701                 .maxlen         = sizeof(dirty_expire_centisecs),
 702                 .mode           = 0644,
 703                 .proc_handler   = &proc_dointvec,
 704         },
 705         {
 706                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
 707                 .procname       = "nr_pdflush_threads",
 708                 .data           = &nr_pdflush_threads,
 709                 .maxlen         = sizeof nr_pdflush_threads,
 710                 .mode           = 0444 /* read-only*/,
 711                 .proc_handler   = &proc_dointvec,
 712         },
 713         {
 714                 .ctl_name       = VM_SWAPPINESS,
 715                 .procname       = "swappiness",
 716                 .data           = &vm_swappiness,
 717                 .maxlen         = sizeof(vm_swappiness),
 718                 .mode           = 0644,
 719                 .proc_handler   = &proc_dointvec_minmax,
 720                 .strategy       = &sysctl_intvec,
 721                 .extra1         = &zero,
 722                 .extra2         = &one_hundred,
 723         },
 724 #ifdef CONFIG_HUGETLB_PAGE
 725          {
 726                 .ctl_name       = VM_HUGETLB_PAGES,
 727                 .procname       = "nr_hugepages",
 728                 .data           = &max_huge_pages,
 729                 .maxlen         = sizeof(unsigned long),
 730                 .mode           = 0644,
 731                 .proc_handler   = &hugetlb_sysctl_handler,
 732                 .extra1         = (void *)&hugetlb_zero,
 733                 .extra2         = (void *)&hugetlb_infinity,
 734          },
 735          {
 736                 .ctl_name       = VM_HUGETLB_GROUP,
 737                 .procname       = "hugetlb_shm_group",
 738                 .data           = &sysctl_hugetlb_shm_group,
 739                 .maxlen         = sizeof(gid_t),
 740                 .mode           = 0644,
 741                 .proc_handler   = &proc_dointvec,
 742          },
 743 #endif
 744         {
 745                 .ctl_name       = VM_LOWER_ZONE_PROTECTION,
 746                 .procname       = "lower_zone_protection",
 747                 .data           = &sysctl_lower_zone_protection,
 748                 .maxlen         = sizeof(sysctl_lower_zone_protection),
 749                 .mode           = 0644,
 750                 .proc_handler   = &lower_zone_protection_sysctl_handler,
 751                 .strategy       = &sysctl_intvec,
 752                 .extra1         = &zero,
 753         },
 754         {
 755                 .ctl_name       = VM_MIN_FREE_KBYTES,
 756                 .procname       = "min_free_kbytes",
 757                 .data           = &min_free_kbytes,
 758                 .maxlen         = sizeof(min_free_kbytes),
 759                 .mode           = 0644,
 760                 .proc_handler   = &min_free_kbytes_sysctl_handler,
 761                 .strategy       = &sysctl_intvec,
 762                 .extra1         = &zero,
 763         },
 764         {
 765                 .ctl_name       = VM_MAX_MAP_COUNT,
 766                 .procname       = "max_map_count",
 767                 .data           = &sysctl_max_map_count,
 768                 .maxlen         = sizeof(sysctl_max_map_count),
 769                 .mode           = 0644,
 770                 .proc_handler   = &proc_dointvec
 771         },
 772         {
 773                 .ctl_name       = VM_LAPTOP_MODE,
 774                 .procname       = "laptop_mode",
 775                 .data           = &laptop_mode,
 776                 .maxlen         = sizeof(laptop_mode),
 777                 .mode           = 0644,
 778                 .proc_handler   = &proc_dointvec,
 779                 .strategy       = &sysctl_intvec,
 780                 .extra1         = &zero,
 781         },
 782         {
 783                 .ctl_name       = VM_BLOCK_DUMP,
 784                 .procname       = "block_dump",
 785                 .data           = &block_dump,
 786                 .maxlen         = sizeof(block_dump),
 787                 .mode           = 0644,
 788                 .proc_handler   = &proc_dointvec,
 789                 .strategy       = &sysctl_intvec,
 790                 .extra1         = &zero,
 791         },
 792         {
 793                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
 794                 .procname       = "vfs_cache_pressure",
 795                 .data           = &sysctl_vfs_cache_pressure,
 796                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
 797                 .mode           = 0644,
 798                 .proc_handler   = &proc_dointvec,
 799                 .strategy       = &sysctl_intvec,
 800                 .extra1         = &zero,
 801         },
 802         { .ctl_name = 0 }
 803 };
 804
 805 static ctl_table proc_table[] = {
 806         { .ctl_name = 0 }
 807 };
 808
 809 static ctl_table fs_table[] = {
 810         {
 811                 .ctl_name       = FS_NRINODE,
 812                 .procname       = "inode-nr",
 813                 .data           = &inodes_stat,
 814                 .maxlen         = 2*sizeof(int),
 815                 .mode           = 0444,
 816                 .proc_handler   = &proc_dointvec,
 817         },
 818         {
 819                 .ctl_name       = FS_STATINODE,
 820                 .procname       = "inode-state",
 821                 .data           = &inodes_stat,
 822                 .maxlen         = 7*sizeof(int),
 823                 .mode           = 0444,
 824                 .proc_handler   = &proc_dointvec,
 825         },
 826         {
 827                 .ctl_name       = FS_NRFILE,
 828                 .procname       = "file-nr",
 829                 .data           = &files_stat,
 830                 .maxlen         = 3*sizeof(int),
 831                 .mode           = 0444,
 832                 .proc_handler   = &proc_dointvec,
 833         },
 834         {
 835                 .ctl_name       = FS_MAXFILE,
 836                 .procname       = "file-max",
 837                 .data           = &files_stat.max_files,
 838                 .maxlen         = sizeof(int),
 839                 .mode           = 0644,
 840                 .proc_handler   = &proc_dointvec,
 841         },
 842         {
 843                 .ctl_name       = FS_DENTRY,
 844                 .procname       = "dentry-state",
 845                 .data           = &dentry_stat,
 846                 .maxlen         = 6*sizeof(int),
 847                 .mode           = 0444,
 848                 .proc_handler   = &proc_dointvec,
 849         },
 850         {
 851                 .ctl_name       = FS_OVERFLOWUID,
 852                 .procname       = "overflowuid",
 853                 .data           = &fs_overflowuid,
 854                 .maxlen         = sizeof(int),
 855                 .mode           = 0644,
 856                 .proc_handler   = &proc_dointvec_minmax,
 857                 .strategy       = &sysctl_intvec,
 858                 .extra1         = &minolduid,
 859                 .extra2         = &maxolduid,
 860         },
 861         {
 862                 .ctl_name       = FS_OVERFLOWGID,
 863                 .procname       = "overflowgid",
 864                 .data           = &fs_overflowgid,
 865                 .maxlen         = sizeof(int),
 866                 .mode           = 0644,
 867                 .proc_handler   = &proc_dointvec_minmax,
 868                 .strategy       = &sysctl_intvec,
 869                 .extra1         = &minolduid,
 870                 .extra2         = &maxolduid,
 871         },
 872         {
 873                 .ctl_name       = FS_LEASES,
 874                 .procname       = "leases-enable",
 875                 .data           = &leases_enable,
 876                 .maxlen         = sizeof(int),
 877                 .mode           = 0644,
 878                 .proc_handler   = &proc_dointvec,
 879         },
 880         {
 881                 .ctl_name       = FS_DIR_NOTIFY,
 882                 .procname       = "dir-notify-enable",
 883                 .data           = &dir_notify_enable,
 884                 .maxlen         = sizeof(int),
 885                 .mode           = 0644,
 886                 .proc_handler   = &proc_dointvec,
 887         },
 888         {
 889                 .ctl_name       = FS_LEASE_TIME,
 890                 .procname       = "lease-break-time",
 891                 .data           = &lease_break_time,
 892                 .maxlen         = sizeof(int),
 893                 .mode           = 0644,
 894                 .proc_handler   = &proc_dointvec,
 895         },
 896         {
 897                 .ctl_name       = FS_AIO_NR,
 898                 .procname       = "aio-nr",
 899                 .data           = &aio_nr,
 900                 .maxlen         = sizeof(aio_nr),
 901                 .mode           = 0444,
 902                 .proc_handler   = &proc_dointvec,
 903         },
 904         {
 905                 .ctl_name       = FS_AIO_MAX_NR,
 906                 .procname       = "aio-max-nr",
 907                 .data           = &aio_max_nr,
 908                 .maxlen         = sizeof(aio_max_nr),
 909                 .mode           = 0644,
 910                 .proc_handler   = &proc_dointvec,
 911         },
 912         { .ctl_name = 0 }
 913 };
 914
 915 static ctl_table debug_table[] = {
 916         { .ctl_name = 0 }
 917 };
 918
 919 static ctl_table dev_table[] = {
 920         { .ctl_name = 0 }
 921 };
 922
 923 extern void init_irq_proc (void);
 924
 925 void __init sysctl_init(void)
 926 {
 927 #ifdef CONFIG_PROC_FS
 928         register_proc_table(root_table, proc_sys_root);
 929         init_irq_proc();
 930 #endif
 931 }
 932
 933 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
 934                void __user *newval, size_t newlen)
 935 {
 936         struct list_head *tmp;
 937
 938         if (nlen <= 0 || nlen >= CTL_MAXNAME)
 939                 return -ENOTDIR;
 940         if (oldval) {
 941                 int old_len;
 942                 if (!oldlenp || get_user(old_len, oldlenp))
 943                         return -EFAULT;
 944         }
 945         tmp = &root_table_header.ctl_entry;
 946         do {
 947                 struct ctl_table_header *head =
 948                         list_entry(tmp, struct ctl_table_header, ctl_entry);
 949                 void *context = NULL;
 950                 int error = parse_table(name, nlen, oldval, oldlenp,
 951                                         newval, newlen, head->ctl_table,
 952                                         &context);
 953                 if (context)
 954                         kfree(context);
 955                 if (error != -ENOTDIR)
 956                         return error;
 957                 tmp = tmp->next;
 958         } while (tmp != &root_table_header.ctl_entry);
 959         return -ENOTDIR;
 960 }
 961
 962 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
 963 {
 964         struct __sysctl_args tmp;
 965         int error;
 966
 967         if (copy_from_user(&tmp, args, sizeof(tmp)))
 968                 return -EFAULT;
 969
 970         lock_kernel();
 971         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
 972                           tmp.newval, tmp.newlen);
 973         unlock_kernel();
 974         return error;
 975 }
 976
 977 /*
 978  * ctl_perm does NOT grant the superuser all rights automatically, because
 979  * some sysctl variables are readonly even to root.
 980  */
 981
 982 static int test_perm(int mode, int op)
 983 {
 984         if (!current->euid)
 985                 mode >>= 6;
 986         else if (in_egroup_p(0))
 987                 mode >>= 3;
 988         if ((mode & op & 0007) == op)
 989                 return 0;
 990         return -EACCES;
 991 }
 992
 993 static inline int ctl_perm(ctl_table *table, int op)
 994 {
 995         int error;
 996         error = security_sysctl(table, op);
 997         if (error)
 998                 return error;
 999         return test_perm(table->mode, op);
1000 }
1001
1002 static int parse_table(int __user *name, int nlen,
1003                        void __user *oldval, size_t __user *oldlenp,
1004                        void __user *newval, size_t newlen,
1005                        ctl_table *table, void **context)
1006 {
1007         int n;
1008 repeat:
1009         if (!nlen)
1010                 return -ENOTDIR;
1011         if (get_user(n, name))
1012                 return -EFAULT;
1013         for ( ; table->ctl_name; table++) {
1014                 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1015                         int error;
1016                         if (table->child) {
1017                                 if (ctl_perm(table, 001))
1018                                         return -EPERM;
1019                                 if (table->strategy) {
1020                                         error = table->strategy(
1021                                                 table, name, nlen,
1022                                                 oldval, oldlenp,
1023                                                 newval, newlen, context);
1024                                         if (error)
1025                                                 return error;
1026                                 }
1027                                 name++;
1028                                 nlen--;
1029                                 table = table->child;
1030                                 goto repeat;
1031                         }
1032                         error = do_sysctl_strategy(table, name, nlen,
1033                                                    oldval, oldlenp,
1034                                                    newval, newlen, context);
1035                         return error;
1036                 }
1037         }
1038         return -ENOTDIR;
1039 }
1040
1041 /* Perform the actual read/write of a sysctl table entry. */
1042 int do_sysctl_strategy (ctl_table *table,
1043                         int __user *name, int nlen,
1044                         void __user *oldval, size_t __user *oldlenp,
1045                         void __user *newval, size_t newlen, void **context)
1046 {
1047         int op = 0, rc;
1048         size_t len;
1049
1050         if (oldval)
1051                 op |= 004;
1052         if (newval)
1053                 op |= 002;
1054         if (ctl_perm(table, op))
1055                 return -EPERM;
1056
1057         if (table->strategy) {
1058                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1059                                      newval, newlen, context);
1060                 if (rc < 0)
1061                         return rc;
1062                 if (rc > 0)
1063                         return 0;
1064         }
1065
1066         /* If there is no strategy routine, or if the strategy returns
1067          * zero, proceed with automatic r/w */
1068         if (table->data && table->maxlen) {
1069                 if (oldval && oldlenp) {
1070                         if (get_user(len, oldlenp))
1071                                 return -EFAULT;
1072                         if (len) {
1073                                 if (len > table->maxlen)
1074                                         len = table->maxlen;
1075                                 if(copy_to_user(oldval, table->data, len))
1076                                         return -EFAULT;
1077                                 if(put_user(len, oldlenp))
1078                                         return -EFAULT;
1079                         }
1080                 }
1081                 if (newval && newlen) {
1082                         len = newlen;
1083                         if (len > table->maxlen)
1084                                 len = table->maxlen;
1085                         if(copy_from_user(table->data, newval, len))
1086                                 return -EFAULT;
1087                 }
1088         }
1089         return 0;
1090 }
1091
1092 /**
1093  * register_sysctl_table - register a sysctl hierarchy
1094  * @table: the top-level table structure
1095  * @insert_at_head: whether the entry should be inserted in front or at the end
1096  *
1097  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1098  * array. An entry with a ctl_name of 0 terminates the table.
1099  *
1100  * The members of the &ctl_table structure are used as follows:
1101  *
1102  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1103  *            must be unique within that level of sysctl
1104  *
1105  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1106  *            enter a sysctl file
1107  *
1108  * data - a pointer to data for use by proc_handler
1109  *
1110  * maxlen - the maximum size in bytes of the data
1111  *
1112  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1113  *
1114  * child - a pointer to the child sysctl table if this entry is a directory, or
1115  *         %NULL.
1116  *
1117  * proc_handler - the text handler routine (described below)
1118  *
1119  * strategy - the strategy routine (described below)
1120  *
1121  * de - for internal use by the sysctl routines
1122  *
1123  * extra1, extra2 - extra pointers usable by the proc handler routines
1124  *
1125  * Leaf nodes in the sysctl tree will be represented by a single file
1126  * under /proc; non-leaf nodes will be represented by directories.
1127  *
1128  * sysctl(2) can automatically manage read and write requests through
1129  * the sysctl table.  The data and maxlen fields of the ctl_table
1130  * struct enable minimal validation of the values being written to be
1131  * performed, and the mode field allows minimal authentication.
1132  *
1133  * More sophisticated management can be enabled by the provision of a
1134  * strategy routine with the table entry.  This will be called before
1135  * any automatic read or write of the data is performed.
1136  *
1137  * The strategy routine may return
1138  *
1139  * < 0 - Error occurred (error is passed to user process)
1140  *
1141  * 0   - OK - proceed with automatic read or write.
1142  *
1143  * > 0 - OK - read or write has been done by the strategy routine, so
1144  *       return immediately.
1145  *
1146  * There must be a proc_handler routine for any terminal nodes
1147  * mirrored under /proc/sys (non-terminals are handled by a built-in
1148  * directory handler).  Several default handlers are available to
1149  * cover common cases -
1150  *
1151  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1152  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1153  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1154  *
1155  * It is the handler's job to read the input buffer from user memory
1156  * and process it. The handler should return 0 on success.
1157  *
1158  * This routine returns %NULL on a failure to register, and a pointer
1159  * to the table header on success.
1160  */
1161 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1162                                                int insert_at_head)
1163 {
1164         struct ctl_table_header *tmp;
1165         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1166         if (!tmp)
1167                 return NULL;
1168         tmp->ctl_table = table;
1169         INIT_LIST_HEAD(&tmp->ctl_entry);
1170         if (insert_at_head)
1171                 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1172         else
1173                 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1174 #ifdef CONFIG_PROC_FS
1175         register_proc_table(table, proc_sys_root);
1176 #endif
1177         return tmp;
1178 }
1179
1180 /**
1181  * unregister_sysctl_table - unregister a sysctl table hierarchy
1182  * @header: the header returned from register_sysctl_table
1183  *
1184  * Unregisters the sysctl table and all children. proc entries may not
1185  * actually be removed until they are no longer used by anyone.
1186  */
1187 void unregister_sysctl_table(struct ctl_table_header * header)
1188 {
1189         list_del(&header->ctl_entry);
1190 #ifdef CONFIG_PROC_FS
1191         unregister_proc_table(header->ctl_table, proc_sys_root);
1192 #endif
1193         kfree(header);
1194 }
1195
1196 /*
1197  * /proc/sys support
1198  */
1199
1200 #ifdef CONFIG_PROC_FS
1201
1202 /* Scan the sysctl entries in table and add them all into /proc */
1203 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root)
1204 {
1205         struct proc_dir_entry *de;
1206         int len;
1207         mode_t mode;
1208
1209         for (; table->ctl_name; table++) {
1210                 /* Can't do anything without a proc name. */
1211                 if (!table->procname)
1212                         continue;
1213                 /* Maybe we can't do anything with it... */
1214                 if (!table->proc_handler && !table->child) {
1215                         printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1216                                 table->procname);
1217                         continue;
1218                 }
1219
1220                 len = strlen(table->procname);
1221                 mode = table->mode;
1222
1223                 de = NULL;
1224                 if (table->proc_handler)
1225                         mode |= S_IFREG;
1226                 else {
1227                         mode |= S_IFDIR;
1228                         for (de = root->subdir; de; de = de->next) {
1229                                 if (proc_match(len, table->procname, de))
1230                                         break;
1231                         }
1232                         /* If the subdir exists already, de is non-NULL */
1233                 }
1234
1235                 if (!de) {
1236                         de = create_proc_entry(table->procname, mode, root);
1237                         if (!de)
1238                                 continue;
1239                         de->data = (void *) table;
1240                         if (table->proc_handler)
1241                                 de->proc_fops = &proc_sys_file_operations;
1242                 }
1243                 table->de = de;
1244                 if (de->mode & S_IFDIR)
1245                         register_proc_table(table->child, de);
1246         }
1247 }
1248
1249 /*
1250  * Unregister a /proc sysctl table and any subdirectories.
1251  */
1252 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1253 {
1254         struct proc_dir_entry *de;
1255         for (; table->ctl_name; table++) {
1256                 if (!(de = table->de))
1257                         continue;
1258                 if (de->mode & S_IFDIR) {
1259                         if (!table->child) {
1260                                 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1261                                 continue;
1262                         }
1263                         unregister_proc_table(table->child, de);
1264
1265                         /* Don't unregister directories which still have entries.. */
1266                         if (de->subdir)
1267                                 continue;
1268                 }
1269
1270                 /* Don't unregister proc entries that are still being used.. */
1271                 if (atomic_read(&de->count))
1272                         continue;
1273
1274                 table->de = NULL;
1275                 remove_proc_entry(table->procname, root);
1276         }
1277 }
1278
1279 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1280                           size_t count, loff_t *ppos)
1281 {
1282         int op;
1283         struct proc_dir_entry *de;
1284         struct ctl_table *table;
1285         size_t res;
1286         ssize_t error;
1287
1288         de = PDE(file->f_dentry->d_inode);
1289         if (!de || !de->data)
1290                 return -ENOTDIR;
1291         table = (struct ctl_table *) de->data;
1292         if (!table || !table->proc_handler)
1293                 return -ENOTDIR;
1294         op = (write ? 002 : 004);
1295         if (ctl_perm(table, op))
1296                 return -EPERM;
1297
1298         res = count;
1299
1300         error = (*table->proc_handler) (table, write, file, buf, &res, ppos);
1301         if (error)
1302                 return error;
1303         return res;
1304 }
1305
1306 static int proc_opensys(struct inode *inode, struct file *file)
1307 {
1308         if (file->f_mode & FMODE_WRITE) {
1309                 /*
1310                  * sysctl entries that are not writable,
1311                  * are _NOT_ writable, capabilities or not.
1312                  */
1313                 if (!(inode->i_mode & S_IWUSR))
1314                         return -EPERM;
1315         }
1316
1317         return 0;
1318 }
1319
1320 static ssize_t proc_readsys(struct file * file, char __user * buf,
1321                             size_t count, loff_t *ppos)
1322 {
1323         return do_rw_proc(0, file, buf, count, ppos);
1324 }
1325
1326 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1327                              size_t count, loff_t *ppos)
1328 {
1329         return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1330 }
1331
1332 /**
1333  * proc_dostring - read a string sysctl
1334  * @table: the sysctl table
1335  * @write: %TRUE if this is a write to the sysctl file
1336  * @filp: the file structure
1337  * @buffer: the user buffer
1338  * @lenp: the size of the user buffer
1339  *
1340  * Reads/writes a string from/to the user buffer. If the kernel
1341  * buffer provided is not large enough to hold the string, the
1342  * string is truncated. The copied string is %NULL-terminated.
1343  * If the string is being read by the user process, it is copied
1344  * and a newline '\n' is added. It is truncated if the buffer is
1345  * not large enough.
1346  *
1347  * Returns 0 on success.
1348  */
1349 int proc_dostring(ctl_table *table, int write, struct file *filp,
1350                   void __user *buffer, size_t *lenp, loff_t *ppos)
1351 {
1352         size_t len;
1353         char __user *p;
1354         char c;
1355
1356         if (!table->data || !table->maxlen || !*lenp ||
1357             (*ppos && !write)) {
1358                 *lenp = 0;
1359                 return 0;
1360         }
1361
1362         if (write) {
1363                 len = 0;
1364                 p = buffer;
1365                 while (len < *lenp) {
1366                         if (get_user(c, p++))
1367                                 return -EFAULT;
1368                         if (c == 0 || c == '\n')
1369                                 break;
1370                         len++;
1371                 }
1372                 if (len >= table->maxlen)
1373                         len = table->maxlen-1;
1374                 if(copy_from_user(table->data, buffer, len))
1375                         return -EFAULT;
1376                 ((char *) table->data)[len] = 0;
1377                 *ppos += *lenp;
1378         } else {
1379                 len = strlen(table->data);
1380                 if (len > table->maxlen)
1381                         len = table->maxlen;
1382                 if (len > *lenp)
1383                         len = *lenp;
1384                 if (len)
1385                         if(copy_to_user(buffer, table->data, len))
1386                                 return -EFAULT;
1387                 if (len < *lenp) {
1388                         if(put_user('\n', ((char __user *) buffer) + len))
1389                                 return -EFAULT;
1390                         len++;
1391                 }
1392                 *lenp = len;
1393                 *ppos += len;
1394         }
1395         return 0;
1396 }
1397
1398 /*
1399  *      Special case of dostring for the UTS structure. This has locks
1400  *      to observe. Should this be in kernel/sys.c ????
1401  */
1402
1403 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1404                   void __user *buffer, size_t *lenp, loff_t *ppos)
1405 {
1406         int r;
1407
1408         if (!write) {
1409                 down_read(&uts_sem);
1410                 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1411                 up_read(&uts_sem);
1412         } else {
1413                 down_write(&uts_sem);
1414                 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1415                 up_write(&uts_sem);
1416         }
1417         return r;
1418 }
1419
1420 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1421                                  int *valp,
1422                                  int write, void *data)
1423 {
1424         if (write) {
1425                 *valp = *negp ? -*lvalp : *lvalp;
1426         } else {
1427                 int val = *valp;
1428                 if (val < 0) {
1429                         *negp = -1;
1430                         *lvalp = (unsigned long)-val;
1431                 } else {
1432                         *negp = 0;
1433                         *lvalp = (unsigned long)val;
1434                 }
1435         }
1436         return 0;
1437 }
1438
1439 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1440                   void __user *buffer, size_t *lenp, loff_t *ppos,
1441                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1442                               int write, void *data),
1443                   void *data)
1444 {
1445 #define TMPBUFLEN 21
1446         int *i, vleft, first=1, neg, val;
1447         unsigned long lval;
1448         size_t left, len;
1449
1450         char buf[TMPBUFLEN], *p;
1451         char __user *s = buffer;
1452
1453         if (!table->data || !table->maxlen || !*lenp ||
1454             (*ppos && !write)) {
1455                 *lenp = 0;
1456                 return 0;
1457         }
1458
1459         i = (int *) table->data;
1460         vleft = table->maxlen / sizeof(*i);
1461         left = *lenp;
1462
1463         if (!conv)
1464                 conv = do_proc_dointvec_conv;
1465
1466         for (; left && vleft--; i++, first=0) {
1467                 if (write) {
1468                         while (left) {
1469                                 char c;
1470                                 if (get_user(c, s))
1471                                         return -EFAULT;
1472                                 if (!isspace(c))
1473                                         break;
1474                                 left--;
1475                                 s++;
1476                         }
1477                         if (!left)
1478                                 break;
1479                         neg = 0;
1480                         len = left;
1481                         if (len > sizeof(buf) - 1)
1482                                 len = sizeof(buf) - 1;
1483                         if (copy_from_user(buf, s, len))
1484                                 return -EFAULT;
1485                         buf[len] = 0;
1486                         p = buf;
1487                         if (*p == '-' && left > 1) {
1488                                 neg = 1;
1489                                 left--, p++;
1490                         }
1491                         if (*p < '0' || *p > '9')
1492                                 break;
1493
1494                         lval = simple_strtoul(p, &p, 0);
1495
1496                         len = p-buf;
1497                         if ((len < left) && *p && !isspace(*p))
1498                                 break;
1499                         if (neg)
1500                                 val = -val;
1501                         s += len;
1502                         left -= len;
1503
1504                         if (conv(&neg, &lval, i, 1, data))
1505                                 break;
1506                 } else {
1507                         p = buf;
1508                         if (!first)
1509                                 *p++ = '\t';
1510
1511                         if (conv(&neg, &lval, i, 0, data))
1512                                 break;
1513
1514                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1515                         len = strlen(buf);
1516                         if (len > left)
1517                                 len = left;
1518                         if(copy_to_user(s, buf, len))
1519                                 return -EFAULT;
1520                         left -= len;
1521                         s += len;
1522                 }
1523         }
1524
1525         if (!write && !first && left) {
1526                 if(put_user('\n', s))
1527                         return -EFAULT;
1528                 left--, s++;
1529         }
1530         if (write) {
1531                 while (left) {
1532                         char c;
1533                         if (get_user(c, s++))
1534                                 return -EFAULT;
1535                         if (!isspace(c))
1536                                 break;
1537                         left--;
1538                 }
1539         }
1540         if (write && first)
1541                 return -EINVAL;
1542         *lenp -= left;
1543         *ppos += *lenp;
1544         return 0;
1545 #undef TMPBUFLEN
1546 }
1547
1548 /**
1549  * proc_dointvec - read a vector of integers
1550  * @table: the sysctl table
1551  * @write: %TRUE if this is a write to the sysctl file
1552  * @filp: the file structure
1553  * @buffer: the user buffer
1554  * @lenp: the size of the user buffer
1555  *
1556  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1557  * values from/to the user buffer, treated as an ASCII string.
1558  *
1559  * Returns 0 on success.
1560  */
1561 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1562                      void __user *buffer, size_t *lenp, loff_t *ppos)
1563 {
1564     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1565                             NULL,NULL);
1566 }
1567
1568 #define OP_SET  0
1569 #define OP_AND  1
1570 #define OP_OR   2
1571 #define OP_MAX  3
1572 #define OP_MIN  4
1573
1574 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1575                                       int *valp,
1576                                       int write, void *data)
1577 {
1578         int op = *(int *)data;
1579         if (write) {
1580                 int val = *negp ? -*lvalp : *lvalp;
1581                 switch(op) {
1582                 case OP_SET:    *valp = val; break;
1583                 case OP_AND:    *valp &= val; break;
1584                 case OP_OR:     *valp |= val; break;
1585                 case OP_MAX:    if(*valp < val)
1586                                         *valp = val;
1587                                 break;
1588                 case OP_MIN:    if(*valp > val)
1589                                 *valp = val;
1590                                 break;
1591                 }
1592         } else {
1593                 int val = *valp;
1594                 if (val < 0) {
1595                         *negp = -1;
1596                         *lvalp = (unsigned long)-val;
1597                 } else {
1598                         *negp = 0;
1599                         *lvalp = (unsigned long)val;
1600                 }
1601         }
1602         return 0;
1603 }
1604
1605 /*
1606  *      init may raise the set.
1607  */
1608
1609 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1610                         void __user *buffer, size_t *lenp, loff_t *ppos)
1611 {
1612         int op;
1613
1614         if (!capable(CAP_SYS_MODULE)) {
1615                 return -EPERM;
1616         }
1617
1618         op = (current->pid == 1) ? OP_SET : OP_AND;
1619         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1620                                 do_proc_dointvec_bset_conv,&op);
1621 }
1622
1623 struct do_proc_dointvec_minmax_conv_param {
1624         int *min;
1625         int *max;
1626 };
1627
1628 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1629                                         int *valp,
1630                                         int write, void *data)
1631 {
1632         struct do_proc_dointvec_minmax_conv_param *param = data;
1633         if (write) {
1634                 int val = *negp ? -*lvalp : *lvalp;
1635                 if ((param->min && *param->min > val) ||
1636                     (param->max && *param->max < val))
1637                         return -EINVAL;
1638                 *valp = val;
1639         } else {
1640                 int val = *valp;
1641                 if (val < 0) {
1642                         *negp = -1;
1643                         *lvalp = (unsigned long)-val;
1644                 } else {
1645                         *negp = 0;
1646                         *lvalp = (unsigned long)val;
1647                 }
1648         }
1649         return 0;
1650 }
1651
1652 /**
1653  * proc_dointvec_minmax - read a vector of integers with min/max values
1654  * @table: the sysctl table
1655  * @write: %TRUE if this is a write to the sysctl file
1656  * @filp: the file structure
1657  * @buffer: the user buffer
1658  * @lenp: the size of the user buffer
1659  *
1660  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1661  * values from/to the user buffer, treated as an ASCII string.
1662  *
1663  * This routine will ensure the values are within the range specified by
1664  * table->extra1 (min) and table->extra2 (max).
1665  *
1666  * Returns 0 on success.
1667  */
1668 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1669                   void __user *buffer, size_t *lenp, loff_t *ppos)
1670 {
1671         struct do_proc_dointvec_minmax_conv_param param = {
1672                 .min = (int *) table->extra1,
1673                 .max = (int *) table->extra2,
1674         };
1675         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1676                                 do_proc_dointvec_minmax_conv, &param);
1677 }
1678
1679 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1680                                      struct file *filp,
1681                                      void __user *buffer,
1682                                      size_t *lenp, loff_t *ppos,
1683                                      unsigned long convmul,
1684                                      unsigned long convdiv)
1685 {
1686 #define TMPBUFLEN 21
1687         unsigned long *i, *min, *max, val;
1688         int vleft, first=1, neg;
1689         size_t len, left;
1690         char buf[TMPBUFLEN], *p;
1691         char __user *s = buffer;
1692
1693         if (!table->data || !table->maxlen || !*lenp ||
1694             (*ppos && !write)) {
1695                 *lenp = 0;
1696                 return 0;
1697         }
1698
1699         i = (unsigned long *) table->data;
1700         min = (unsigned long *) table->extra1;
1701         max = (unsigned long *) table->extra2;
1702         vleft = table->maxlen / sizeof(unsigned long);
1703         left = *lenp;
1704
1705         for (; left && vleft--; i++, min++, max++, first=0) {
1706                 if (write) {
1707                         while (left) {
1708                                 char c;
1709                                 if (get_user(c, s))
1710                                         return -EFAULT;
1711                                 if (!isspace(c))
1712                                         break;
1713                                 left--;
1714                                 s++;
1715                         }
1716                         if (!left)
1717                                 break;
1718                         neg = 0;
1719                         len = left;
1720                         if (len > TMPBUFLEN-1)
1721                                 len = TMPBUFLEN-1;
1722                         if (copy_from_user(buf, s, len))
1723                                 return -EFAULT;
1724                         buf[len] = 0;
1725                         p = buf;
1726                         if (*p == '-' && left > 1) {
1727                                 neg = 1;
1728                                 left--, p++;
1729                         }
1730                         if (*p < '0' || *p > '9')
1731                                 break;
1732                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1733                         len = p-buf;
1734                         if ((len < left) && *p && !isspace(*p))
1735                                 break;
1736                         if (neg)
1737                                 val = -val;
1738                         s += len;
1739                         left -= len;
1740
1741                         if(neg)
1742                                 continue;
1743                         if ((min && val < *min) || (max && val > *max))
1744                                 continue;
1745                         *i = val;
1746                 } else {
1747                         p = buf;
1748                         if (!first)
1749                                 *p++ = '\t';
1750                         sprintf(p, "%lu", convdiv * (*i) / convmul);
1751                         len = strlen(buf);
1752                         if (len > left)
1753                                 len = left;
1754                         if(copy_to_user(s, buf, len))
1755                                 return -EFAULT;
1756                         left -= len;
1757                         s += len;
1758                 }
1759         }
1760
1761         if (!write && !first && left) {
1762                 if(put_user('\n', s))
1763                         return -EFAULT;
1764                 left--, s++;
1765         }
1766         if (write) {
1767                 while (left) {
1768                         char c;
1769                         if (get_user(c, s++))
1770                                 return -EFAULT;
1771                         if (!isspace(c))
1772                                 break;
1773                         left--;
1774                 }
1775         }
1776         if (write && first)
1777                 return -EINVAL;
1778         *lenp -= left;
1779         *ppos += *lenp;
1780         return 0;
1781 #undef TMPBUFLEN
1782 }
1783
1784 /**
1785  * proc_doulongvec_minmax - read a vector of long integers with min/max values
1786  * @table: the sysctl table
1787  * @write: %TRUE if this is a write to the sysctl file
1788  * @filp: the file structure
1789  * @buffer: the user buffer
1790  * @lenp: the size of the user buffer
1791  *
1792  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1793  * values from/to the user buffer, treated as an ASCII string.
1794  *
1795  * This routine will ensure the values are within the range specified by
1796  * table->extra1 (min) and table->extra2 (max).
1797  *
1798  * Returns 0 on success.
1799  */
1800 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
1801                            void __user *buffer, size_t *lenp, loff_t *ppos)
1802 {
1803     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
1804 }
1805
1806 /**
1807  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1808  * @table: the sysctl table
1809  * @write: %TRUE if this is a write to the sysctl file
1810  * @filp: the file structure
1811  * @buffer: the user buffer
1812  * @lenp: the size of the user buffer
1813  *
1814  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1815  * values from/to the user buffer, treated as an ASCII string. The values
1816  * are treated as milliseconds, and converted to jiffies when they are stored.
1817  *
1818  * This routine will ensure the values are within the range specified by
1819  * table->extra1 (min) and table->extra2 (max).
1820  *
1821  * Returns 0 on success.
1822  */
1823 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
1824                                       struct file *filp,
1825                                       void __user *buffer,
1826                                       size_t *lenp, loff_t *ppos)
1827 {
1828     return do_proc_doulongvec_minmax(table, write, filp, buffer,
1829                                      lenp, ppos, HZ, 1000l);
1830 }
1831
1832
1833 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
1834                                          int *valp,
1835                                          int write, void *data)
1836 {
1837         if (write) {
1838                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1839         } else {
1840                 int val = *valp;
1841                 unsigned long lval;
1842                 if (val < 0) {
1843                         *negp = -1;
1844                         lval = (unsigned long)-val;
1845                 } else {
1846                         *negp = 0;
1847                         lval = (unsigned long)val;
1848                 }
1849                 *lvalp = lval / HZ;
1850         }
1851         return 0;
1852 }
1853
1854 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
1855                                                 int *valp,
1856                                                 int write, void *data)
1857 {
1858         if (write) {
1859                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1860         } else {
1861                 int val = *valp;
1862                 unsigned long lval;
1863                 if (val < 0) {
1864                         *negp = -1;
1865                         lval = (unsigned long)-val;
1866                 } else {
1867                         *negp = 0;
1868                         lval = (unsigned long)val;
1869                 }
1870                 *lvalp = jiffies_to_clock_t(lval);
1871         }
1872         return 0;
1873 }
1874
1875 /**
1876  * proc_dointvec_jiffies - read a vector of integers as seconds
1877  * @table: the sysctl table
1878  * @write: %TRUE if this is a write to the sysctl file
1879  * @filp: the file structure
1880  * @buffer: the user buffer
1881  * @lenp: the size of the user buffer
1882  *
1883  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1884  * values from/to the user buffer, treated as an ASCII string.
1885  * The values read are assumed to be in seconds, and are converted into
1886  * jiffies.
1887  *
1888  * Returns 0 on success.
1889  */
1890 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
1891                           void __user *buffer, size_t *lenp, loff_t *ppos)
1892 {
1893     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1894                             do_proc_dointvec_jiffies_conv,NULL);
1895 }
1896
1897 /**
1898  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1899  * @table: the sysctl table
1900  * @write: %TRUE if this is a write to the sysctl file
1901  * @filp: the file structure
1902  * @buffer: the user buffer
1903  * @lenp: the size of the user buffer
1904  *
1905  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1906  * values from/to the user buffer, treated as an ASCII string.
1907  * The values read are assumed to be in 1/USER_HZ seconds, and
1908  * are converted into jiffies.
1909  *
1910  * Returns 0 on success.
1911  */
1912 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
1913                                  void __user *buffer, size_t *lenp, loff_t *ppos)
1914 {
1915     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1916                             do_proc_dointvec_userhz_jiffies_conv,NULL);
1917 }
1918
1919 #else /* CONFIG_PROC_FS */
1920
1921 int proc_dostring(ctl_table *table, int write, struct file *filp,
1922                   void __user *buffer, size_t *lenp, loff_t *ppos)
1923 {
1924         return -ENOSYS;
1925 }
1926
1927 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1928                             void __user *buffer, size_t *lenp, loff_t *ppos)
1929 {
1930         return -ENOSYS;
1931 }
1932
1933 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1934                   void __user *buffer, size_t *lenp, loff_t *ppos)
1935 {
1936         return -ENOSYS;
1937 }
1938
1939 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1940                         void __user *buffer, size_t *lenp, loff_t *ppos)
1941 {
1942         return -ENOSYS;
1943 }
1944
1945 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1946                     void __user *buffer, size_t *lenp, loff_t *ppos)
1947 {
1948         return -ENOSYS;
1949 }
1950
1951 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
1952                     void __user *buffer, size_t *lenp, loff_t *ppos)
1953 {
1954         return -ENOSYS;
1955 }
1956
1957 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
1958                     void __user *buffer, size_t *lenp, loff_t *ppos)
1959 {
1960         return -ENOSYS;
1961 }
1962
1963 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
1964                     void __user *buffer, size_t *lenp, loff_t *ppos)
1965 {
1966         return -ENOSYS;
1967 }
1968
1969 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
1970                                       struct file *filp,
1971                                       void __user *buffer,
1972                                       size_t *lenp, loff_t *ppos)
1973 {
1974     return -ENOSYS;
1975 }
1976
1977
1978 #endif /* CONFIG_PROC_FS */
1979
1980
1981 /*
1982  * General sysctl support routines
1983  */
1984
1985 /* The generic string strategy routine: */
1986 int sysctl_string(ctl_table *table, int __user *name, int nlen,
1987                   void __user *oldval, size_t __user *oldlenp,
1988                   void __user *newval, size_t newlen, void **context)
1989 {
1990         size_t l, len;
1991
1992         if (!table->data || !table->maxlen)
1993                 return -ENOTDIR;
1994
1995         if (oldval && oldlenp) {
1996                 if (get_user(len, oldlenp))
1997                         return -EFAULT;
1998                 if (len) {
1999                         l = strlen(table->data);
2000                         if (len > l) len = l;
2001                         if (len >= table->maxlen)
2002                                 len = table->maxlen;
2003                         if(copy_to_user(oldval, table->data, len))
2004                                 return -EFAULT;
2005                         if(put_user(0, ((char __user *) oldval) + len))
2006                                 return -EFAULT;
2007                         if(put_user(len, oldlenp))
2008                                 return -EFAULT;
2009                 }
2010         }
2011         if (newval && newlen) {
2012                 len = newlen;
2013                 if (len > table->maxlen)
2014                         len = table->maxlen;
2015                 if(copy_from_user(table->data, newval, len))
2016                         return -EFAULT;
2017                 if (len == table->maxlen)
2018                         len--;
2019                 ((char *) table->data)[len] = 0;
2020         }
2021         return 0;
2022 }
2023
2024 /*
2025  * This function makes sure that all of the integers in the vector
2026  * are between the minimum and maximum values given in the arrays
2027  * table->extra1 and table->extra2, respectively.
2028  */
2029 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2030                 void __user *oldval, size_t __user *oldlenp,
2031                 void __user *newval, size_t newlen, void **context)
2032 {
2033
2034         if (newval && newlen) {
2035                 int __user *vec = (int __user *) newval;
2036                 int *min = (int *) table->extra1;
2037                 int *max = (int *) table->extra2;
2038                 size_t length;
2039                 int i;
2040
2041                 if (newlen % sizeof(int) != 0)
2042                         return -EINVAL;
2043
2044                 if (!table->extra1 && !table->extra2)
2045                         return 0;
2046
2047                 if (newlen > table->maxlen)
2048                         newlen = table->maxlen;
2049                 length = newlen / sizeof(int);
2050
2051                 for (i = 0; i < length; i++) {
2052                         int value;
2053                         if (get_user(value, vec + i))
2054                                 return -EFAULT;
2055                         if (min && value < min[i])
2056                                 return -EINVAL;
2057                         if (max && value > max[i])
2058                                 return -EINVAL;
2059                 }
2060         }
2061         return 0;
2062 }
2063
2064 /* Strategy function to convert jiffies to seconds */
2065 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2066                 void __user *oldval, size_t __user *oldlenp,
2067                 void __user *newval, size_t newlen, void **context)
2068 {
2069         if (oldval) {
2070                 size_t olen;
2071                 if (oldlenp) {
2072                         if (get_user(olen, oldlenp))
2073                                 return -EFAULT;
2074                         if (olen!=sizeof(int))
2075                                 return -EINVAL;
2076                 }
2077                 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2078                     (oldlenp && put_user(sizeof(int),oldlenp)))
2079                         return -EFAULT;
2080         }
2081         if (newval && newlen) {
2082                 int new;
2083                 if (newlen != sizeof(int))
2084                         return -EINVAL;
2085                 if (get_user(new, (int __user *)newval))
2086                         return -EFAULT;
2087                 *(int *)(table->data) = new*HZ;
2088         }
2089         return 1;
2090 }
2091
2092
2093 #else /* CONFIG_SYSCTL */
2094
2095
2096 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2097 {
2098         return -ENOSYS;
2099 }
2100
2101 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2102                   void __user *oldval, size_t __user *oldlenp,
2103                   void __user *newval, size_t newlen, void **context)
2104 {
2105         return -ENOSYS;
2106 }
2107
2108 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2109                 void __user *oldval, size_t __user *oldlenp,
2110                 void __user *newval, size_t newlen, void **context)
2111 {
2112         return -ENOSYS;
2113 }
2114
2115 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2116                 void __user *oldval, size_t __user *oldlenp,
2117                 void __user *newval, size_t newlen, void **context)
2118 {
2119         return -ENOSYS;
2120 }
2121
2122 int proc_dostring(ctl_table *table, int write, struct file *filp,
2123                   void __user *buffer, size_t *lenp, loff_t *ppos)
2124 {
2125         return -ENOSYS;
2126 }
2127
2128 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2129                   void __user *buffer, size_t *lenp, loff_t *ppos)
2130 {
2131         return -ENOSYS;
2132 }
2133
2134 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2135                         void __user *buffer, size_t *lenp, loff_t *ppos)
2136 {
2137         return -ENOSYS;
2138 }
2139
2140 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2141                     void __user *buffer, size_t *lenp, loff_t *ppos)
2142 {
2143         return -ENOSYS;
2144 }
2145
2146 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2147                           void __user *buffer, size_t *lenp, loff_t *ppos)
2148 {
2149         return -ENOSYS;
2150 }
2151
2152 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2153                           void __user *buffer, size_t *lenp, loff_t *ppos)
2154 {
2155         return -ENOSYS;
2156 }
2157
2158 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2159                     void __user *buffer, size_t *lenp, loff_t *ppos)
2160 {
2161         return -ENOSYS;
2162 }
2163
2164 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2165                                       struct file *filp,
2166                                       void __user *buffer,
2167                                       size_t *lenp, loff_t *ppos)
2168 {
2169     return -ENOSYS;
2170 }
2171
2172 struct ctl_table_header * register_sysctl_table(ctl_table * table,
2173                                                 int insert_at_head)
2174 {
2175         return NULL;
2176 }
2177
2178 void unregister_sysctl_table(struct ctl_table_header * table)
2179 {
2180 }
2181
2182 #endif /* CONFIG_SYSCTL */
2183
2184 /*
2185  * No sense putting this after each symbol definition, twice,
2186  * exception granted :-)
2187  */
2188 EXPORT_SYMBOL(proc_dointvec);
2189 EXPORT_SYMBOL(proc_dointvec_jiffies);
2190 EXPORT_SYMBOL(proc_dointvec_minmax);
2191 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2192 EXPORT_SYMBOL(proc_dostring);
2193 EXPORT_SYMBOL(proc_doulongvec_minmax);
2194 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2195 EXPORT_SYMBOL(register_sysctl_table);
2196 EXPORT_SYMBOL(sysctl_intvec);
2197 EXPORT_SYMBOL(sysctl_jiffies);
2198 EXPORT_SYMBOL(sysctl_string);
2199 EXPORT_SYMBOL(unregister_sysctl_table);