bsd/miscfs/devfs/devfs_vfsops.c

   1 /*
   2  * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*-
  29  * Copyright 1997,1998 Julian Elischer.  All rights reserved.
  30  * julian@freebsd.org
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions are
  34  * met:
  35  *  1. Redistributions of source code must retain the above copyright
  36  *     notice, this list of conditions and the following disclaimer.
  37  *  2. Redistributions in binary form must reproduce the above copyright notice,
  38  *     this list of conditions and the following disclaimer in the documentation
  39  *     and/or other materials provided with the distribution.
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY EXPRESS
  42  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  43  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  44  * DISCLAIMED.  IN NO EVENT SHALL THE HOLDER OR CONTRIBUTORS BE LIABLE FOR
  45  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  47  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  48  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * devfs_vfsops.c
  54  *
  55  */
  56 /*
  57  * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
  58  * support for mandatory and extensible security protections.  This notice
  59  * is included in support of clause 2.2 (b) of the Apple Public License,
  60  * Version 2.0.
  61  */
  62 /*
  63  * HISTORY
  64  *  Dieter Siegmund (dieter@apple.com) Wed Jul 14 13:37:59 PDT 1999
  65  *  - modified devfs_statfs() to use devfs_stats to calculate the
  66  *    amount of memory used by devfs
  67  */
  68
  69
  70 #include <sys/param.h>
  71 #include <sys/systm.h>
  72 #include <sys/kernel.h>
  73 #include <sys/vnode_internal.h>
  74 #include <sys/proc.h>
  75 #include <sys/kauth.h>
  76 #include <sys/mount_internal.h>
  77 #include <sys/malloc.h>
  78
  79 #include <libkern/OSAtomic.h>
  80
  81 #if CONFIG_MACF
  82 #include <security/mac_framework.h>
  83 #endif
  84
  85 #include "devfs.h"
  86 #include "devfsdefs.h"
  87
  88 #if FDESC
  89 #include "fdesc.h"
  90 #endif /* FDESC */
  91
  92
  93 static int devfs_statfs( struct mount *mp, struct vfsstatfs *sbp, vfs_context_t ctx);
  94 static int devfs_vfs_getattr(mount_t mp, struct vfs_attr *fsap, vfs_context_t ctx);
  95
  96 #if CONFIG_DEV_KMEM
  97 extern boolean_t dev_kmem_enabled;
  98 #endif
  99
 100 /*-
 101  * Called from the generic VFS startups.
 102  * This is the second stage of DEVFS initialisation.
 103  * The probed devices have already been loaded and the
 104  * basic structure of the DEVFS created.
 105  * We take the oportunity to mount the hidden DEVFS layer, so that
 106  * devices from devfs get sync'd.
 107  */
 108 static int
 109 devfs_init(__unused struct vfsconf *vfsp)
 110 {
 111         if (devfs_sinit())
 112                 return (ENOTSUP);
 113         devfs_make_node(makedev(0, 0), DEVFS_CHAR,
 114                                         UID_ROOT, GID_WHEEL, 0622, "console");
 115         devfs_make_node(makedev(2, 0), DEVFS_CHAR,
 116                                         UID_ROOT, GID_WHEEL, 0666, "tty");
 117 #if CONFIG_DEV_KMEM
 118         if (dev_kmem_enabled) {
 119                 /* (3,0) reserved for /dev/mem physical memory */
 120                 devfs_make_node(makedev(3, 1), DEVFS_CHAR,
 121                                                 UID_ROOT, GID_KMEM, 0640, "kmem");
 122         }
 123 #endif
 124         devfs_make_node(makedev(3, 2), DEVFS_CHAR,
 125                                         UID_ROOT, GID_WHEEL, 0666, "null");
 126         devfs_make_node(makedev(3, 3), DEVFS_CHAR,
 127                                         UID_ROOT, GID_WHEEL, 0666, "zero");
 128         devfs_make_node(makedev(6, 0), DEVFS_CHAR,
 129                                         UID_ROOT, GID_WHEEL, 0600, "klog");
 130
 131 #if  FDESC
 132         devfs_fdesc_init();
 133 #endif
 134
 135     return 0;
 136 }
 137
 138 /*-
 139  *  mp   - pointer to 'mount' structure
 140  *  path - addr in user space of mount point (ie /usr or whatever)
 141  *  data - addr in user space of mount params including the
 142  *         name of the block special file to treat as a filesystem.
 143  *         (NOT USED)
 144  *  ndp  - namei data pointer (NOT USED)
 145  *  p    - proc pointer
 146  * devfs is special in that it doesn't require any device to be mounted..
 147  * It makes up its data as it goes along.
 148  * it must be mounted during single user.. until it is, only std{in/out/err}
 149  * and the root filesystem are available.
 150  */
 151 /*proto*/
 152 int
 153 devfs_mount(struct mount *mp, __unused vnode_t devvp, __unused user_addr_t data, vfs_context_t ctx)
 154 {
 155         struct devfsmount *devfs_mp_p;  /* devfs specific mount info */
 156         int error;
 157
 158         /*-
 159          *  If they just want to update, we don't need to do anything.
 160          */
 161         if (mp->mnt_flag & MNT_UPDATE)
 162         {
 163                 return 0;
 164         }
 165
 166         /* Advisory locking should be handled at the VFS layer */
 167         vfs_setlocklocal(mp);
 168
 169         /*-
 170          *  Well, it's not an update, it's a real mount request.
 171          *  Time to get dirty.
 172          * HERE we should check to see if we are already mounted here.
 173          */
 174
 175         MALLOC(devfs_mp_p, struct devfsmount *, sizeof(struct devfsmount),
 176                M_DEVFSMNT, M_WAITOK);
 177         if (devfs_mp_p == NULL)
 178                 return (ENOMEM);
 179         bzero(devfs_mp_p,sizeof(*devfs_mp_p));
 180         devfs_mp_p->mount = mp;
 181
 182         /*-
 183          *  Fill out some fields
 184          */
 185         __IGNORE_WCASTALIGN(mp->mnt_data = (qaddr_t)devfs_mp_p);
 186         mp->mnt_vfsstat.f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p;
 187         mp->mnt_vfsstat.f_fsid.val[1] = vfs_typenum(mp);
 188         mp->mnt_flag |= MNT_LOCAL;
 189
 190         DEVFS_LOCK();
 191         error = dev_dup_plane(devfs_mp_p);
 192         DEVFS_UNLOCK();
 193
 194         if (error) {
 195                 mp->mnt_data = (qaddr_t)0;
 196                 FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
 197                 return (error);
 198         } else
 199                 DEVFS_INCR_MOUNTS();
 200
 201         /*-
 202          *  Copy in the name of the directory the filesystem
 203          *  is to be mounted on.
 204          *  And we clear the remainder of the character strings
 205          *  to be tidy.
 206          */
 207
 208         bzero(mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN);
 209         bcopy("devfs",mp->mnt_vfsstat.f_mntfromname, 5);
 210         (void)devfs_statfs(mp, &mp->mnt_vfsstat, ctx);
 211
 212         return 0;
 213 }
 214
 215
 216 static int
 217 devfs_start(__unused struct mount *mp, __unused int flags, __unused vfs_context_t ctx)
 218 {
 219         return 0;
 220 }
 221
 222 /*-
 223  *  Unmount the filesystem described by mp.
 224  */
 225 static int
 226 devfs_unmount( struct mount *mp, int mntflags, __unused vfs_context_t ctx)
 227 {
 228         struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
 229         int flags = 0;
 230         int force = 0;
 231         int error;
 232
 233         if (mntflags & MNT_FORCE) {
 234                 flags |= FORCECLOSE;
 235                 force = 1;
 236         }
 237         error = vflush(mp, NULLVP, flags);
 238         if (error && !force)
 239                 return error;
 240
 241         DEVFS_LOCK();
 242         devfs_free_plane(devfs_mp_p);
 243         DEVFS_UNLOCK();
 244
 245         DEVFS_DECR_MOUNTS();
 246
 247         FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
 248         mp->mnt_data = (qaddr_t)0;
 249         mp->mnt_flag &= ~MNT_LOCAL;
 250
 251         return 0;
 252 }
 253
 254 /* return the address of the root vnode  in *vpp */
 255 static int
 256 devfs_root(struct mount *mp, struct vnode **vpp, __unused vfs_context_t ctx)
 257 {
 258         struct devfsmount *devfs_mp_p = (struct devfsmount *)(mp->mnt_data);
 259         int error;
 260
 261         DEVFS_LOCK();
 262         /* last parameter to devfs_dntovn() is ignored */
 263         error = devfs_dntovn(devfs_mp_p->plane_root->de_dnp, vpp, NULL);
 264         DEVFS_UNLOCK();
 265
 266         return error;
 267 }
 268
 269 static int
 270 devfs_statfs( struct mount *mp, struct vfsstatfs *sbp, __unused vfs_context_t ctx)
 271 {
 272         struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
 273
 274         /*-
 275          *  Fill in the stat block.
 276          */
 277         //sbp->f_type   = mp->mnt_vfsstat.f_type;
 278         sbp->f_flags  = 0;              /* XXX */
 279         sbp->f_bsize  = 512;
 280         sbp->f_iosize = 512;
 281         sbp->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
 282                          + devfs_stats.nodes * sizeof(devnode_t)
 283                          + devfs_stats.entries * sizeof(devdirent_t)
 284                          + devfs_stats.stringspace
 285                          ) / sbp->f_bsize;
 286         sbp->f_bfree  = 0;
 287         sbp->f_bavail = 0;
 288         sbp->f_files  = devfs_stats.nodes;
 289         sbp->f_ffree  = 0;
 290         sbp->f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p;
 291         sbp->f_fsid.val[1] = vfs_typenum(mp);
 292
 293         return 0;
 294 }
 295
 296 static int
 297 devfs_vfs_getattr(__unused mount_t mp, struct vfs_attr *fsap, __unused vfs_context_t ctx)
 298 {
 299         VFSATTR_RETURN(fsap, f_objcount, devfs_stats.nodes);
 300         VFSATTR_RETURN(fsap, f_maxobjcount, devfs_stats.nodes);
 301         VFSATTR_RETURN(fsap, f_bsize, 512);
 302         VFSATTR_RETURN(fsap, f_iosize, 512);
 303         if (VFSATTR_IS_ACTIVE(fsap, f_blocks) || VFSATTR_IS_ACTIVE(fsap, f_bused)) {
 304                 fsap->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
 305                          + devfs_stats.nodes * sizeof(devnode_t)
 306                          + devfs_stats.entries * sizeof(devdirent_t)
 307                          + devfs_stats.stringspace
 308                          ) / fsap->f_bsize;
 309                 fsap->f_bused = fsap->f_blocks;
 310                 VFSATTR_SET_SUPPORTED(fsap, f_blocks);
 311                 VFSATTR_SET_SUPPORTED(fsap, f_bused);
 312         }
 313         VFSATTR_RETURN(fsap, f_bfree, 0);
 314         VFSATTR_RETURN(fsap, f_bavail, 0);
 315         VFSATTR_RETURN(fsap, f_files, devfs_stats.nodes);
 316         VFSATTR_RETURN(fsap, f_ffree, 0);
 317         VFSATTR_RETURN(fsap, f_fssubtype, 0);
 318
 319         if (VFSATTR_IS_ACTIVE(fsap, f_capabilities)) {
 320                 fsap->f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] =
 321                         VOL_CAP_FMT_SYMBOLICLINKS |
 322                         VOL_CAP_FMT_HARDLINKS |
 323                         VOL_CAP_FMT_NO_ROOT_TIMES |
 324                         VOL_CAP_FMT_CASE_SENSITIVE |
 325                         VOL_CAP_FMT_CASE_PRESERVING |
 326                         VOL_CAP_FMT_FAST_STATFS |
 327                         VOL_CAP_FMT_2TB_FILESIZE |
 328                         VOL_CAP_FMT_HIDDEN_FILES;
 329                 fsap->f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] =
 330                         VOL_CAP_INT_ATTRLIST ;
 331                 fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED1] = 0;
 332                 fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED2] = 0;
 333
 334                 fsap->f_capabilities.valid[VOL_CAPABILITIES_FORMAT] =
 335                         VOL_CAP_FMT_PERSISTENTOBJECTIDS |
 336                         VOL_CAP_FMT_SYMBOLICLINKS |
 337                         VOL_CAP_FMT_HARDLINKS |
 338                         VOL_CAP_FMT_JOURNAL |
 339                         VOL_CAP_FMT_JOURNAL_ACTIVE |
 340                         VOL_CAP_FMT_NO_ROOT_TIMES |
 341                         VOL_CAP_FMT_SPARSE_FILES |
 342                         VOL_CAP_FMT_ZERO_RUNS |
 343                         VOL_CAP_FMT_CASE_SENSITIVE |
 344                         VOL_CAP_FMT_CASE_PRESERVING |
 345                         VOL_CAP_FMT_FAST_STATFS |
 346                         VOL_CAP_FMT_2TB_FILESIZE |
 347                         VOL_CAP_FMT_OPENDENYMODES |
 348                         VOL_CAP_FMT_HIDDEN_FILES |
 349                         VOL_CAP_FMT_PATH_FROM_ID |
 350                         VOL_CAP_FMT_NO_VOLUME_SIZES;
 351                 fsap->f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] =
 352                         VOL_CAP_INT_SEARCHFS |
 353                         VOL_CAP_INT_ATTRLIST |
 354                         VOL_CAP_INT_NFSEXPORT |
 355                         VOL_CAP_INT_READDIRATTR |
 356                         VOL_CAP_INT_EXCHANGEDATA |
 357                         VOL_CAP_INT_COPYFILE |
 358                         VOL_CAP_INT_ALLOCATE |
 359                         VOL_CAP_INT_VOL_RENAME |
 360                         VOL_CAP_INT_ADVLOCK |
 361                         VOL_CAP_INT_FLOCK |
 362                         VOL_CAP_INT_EXTENDED_SECURITY |
 363                         VOL_CAP_INT_USERACCESS |
 364                         VOL_CAP_INT_MANLOCK |
 365                         VOL_CAP_INT_EXTENDED_ATTR |
 366                         VOL_CAP_INT_NAMEDSTREAMS;
 367                 fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED1] = 0;
 368                 fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED2] = 0;
 369
 370                 VFSATTR_SET_SUPPORTED(fsap, f_capabilities);
 371         }
 372
 373         if (VFSATTR_IS_ACTIVE(fsap, f_attributes)) {
 374                 fsap->f_attributes.validattr.commonattr =
 375                         ATTR_CMN_NAME | ATTR_CMN_DEVID | ATTR_CMN_FSID |
 376                         ATTR_CMN_OBJTYPE | ATTR_CMN_OBJTAG | ATTR_CMN_OBJID |
 377                         ATTR_CMN_PAROBJID |
 378                         ATTR_CMN_MODTIME | ATTR_CMN_CHGTIME | ATTR_CMN_ACCTIME |
 379                         ATTR_CMN_OWNERID | ATTR_CMN_GRPID | ATTR_CMN_ACCESSMASK |
 380                         ATTR_CMN_FLAGS | ATTR_CMN_USERACCESS | ATTR_CMN_FILEID;
 381                 fsap->f_attributes.validattr.volattr =
 382                         ATTR_VOL_FSTYPE | ATTR_VOL_SIZE | ATTR_VOL_SPACEFREE |
 383                         ATTR_VOL_SPACEAVAIL | ATTR_VOL_MINALLOCATION |
 384                         ATTR_VOL_OBJCOUNT | ATTR_VOL_MAXOBJCOUNT |
 385                         ATTR_VOL_MOUNTPOINT | ATTR_VOL_MOUNTFLAGS |
 386                         ATTR_VOL_MOUNTEDDEVICE | ATTR_VOL_CAPABILITIES |
 387                         ATTR_VOL_ATTRIBUTES;
 388                 fsap->f_attributes.validattr.dirattr =
 389                         ATTR_DIR_LINKCOUNT | ATTR_DIR_MOUNTSTATUS;
 390                 fsap->f_attributes.validattr.fileattr =
 391                         ATTR_FILE_LINKCOUNT | ATTR_FILE_TOTALSIZE |
 392                         ATTR_FILE_IOBLOCKSIZE | ATTR_FILE_DEVTYPE |
 393                         ATTR_FILE_DATALENGTH;
 394                 fsap->f_attributes.validattr.forkattr = 0;
 395
 396                 fsap->f_attributes.nativeattr.commonattr =
 397                         ATTR_CMN_NAME | ATTR_CMN_DEVID | ATTR_CMN_FSID |
 398                         ATTR_CMN_OBJTYPE | ATTR_CMN_OBJTAG | ATTR_CMN_OBJID |
 399                         ATTR_CMN_PAROBJID |
 400                         ATTR_CMN_MODTIME | ATTR_CMN_CHGTIME | ATTR_CMN_ACCTIME |
 401                         ATTR_CMN_OWNERID | ATTR_CMN_GRPID | ATTR_CMN_ACCESSMASK |
 402                         ATTR_CMN_FLAGS | ATTR_CMN_USERACCESS | ATTR_CMN_FILEID;
 403                 fsap->f_attributes.nativeattr.volattr =
 404                         ATTR_VOL_FSTYPE | ATTR_VOL_SIZE | ATTR_VOL_SPACEFREE |
 405                         ATTR_VOL_SPACEAVAIL | ATTR_VOL_MINALLOCATION |
 406                         ATTR_VOL_OBJCOUNT | ATTR_VOL_MAXOBJCOUNT |
 407                         ATTR_VOL_MOUNTPOINT | ATTR_VOL_MOUNTFLAGS |
 408                         ATTR_VOL_MOUNTEDDEVICE | ATTR_VOL_CAPABILITIES |
 409                         ATTR_VOL_ATTRIBUTES;
 410                 fsap->f_attributes.nativeattr.dirattr =
 411                         ATTR_DIR_MOUNTSTATUS;
 412                 fsap->f_attributes.nativeattr.fileattr =
 413                         ATTR_FILE_LINKCOUNT | ATTR_FILE_TOTALSIZE |
 414                         ATTR_FILE_IOBLOCKSIZE | ATTR_FILE_DEVTYPE |
 415                         ATTR_FILE_DATALENGTH;
 416                 fsap->f_attributes.nativeattr.forkattr = 0;
 417
 418                 VFSATTR_SET_SUPPORTED(fsap, f_attributes);
 419         }
 420
 421         return 0;
 422 }
 423
 424 static int
 425 devfs_sync(__unused struct mount *mp, __unused int waitfor, __unused vfs_context_t ctx)
 426 {
 427     return (0);
 428 }
 429
 430
 431 static int
 432 devfs_vget(__unused struct mount *mp, __unused ino64_t ino, __unused struct vnode **vpp, __unused vfs_context_t ctx)
 433 {
 434         return ENOTSUP;
 435 }
 436
 437 /*************************************************************
 438  * The concept of exporting a kernel generated devfs is stupid
 439  * So don't handle filehandles
 440  */
 441
 442 static int
 443 devfs_fhtovp (__unused struct mount *mp, __unused int fhlen, __unused unsigned char *fhp, __unused struct vnode **vpp, __unused vfs_context_t ctx)
 444 {
 445         return (EINVAL);
 446 }
 447
 448
 449 static int
 450 devfs_vptofh (__unused struct vnode *vp, __unused int *fhlenp, __unused unsigned char *fhp, __unused vfs_context_t ctx)
 451 {
 452         return (EINVAL);
 453 }
 454
 455 static int
 456 devfs_sysctl(__unused int *name, __unused u_int namelen, __unused user_addr_t oldp,
 457              __unused size_t *oldlenp, __unused user_addr_t newp,
 458              __unused size_t newlen, __unused vfs_context_t ctx)
 459 {
 460     return (ENOTSUP);
 461 }
 462
 463 #include <sys/namei.h>
 464
 465 /*
 466  * Function: devfs_kernel_mount
 467  * Purpose:
 468  *   Mount devfs at the given mount point from within the kernel.
 469  */
 470 int
 471 devfs_kernel_mount(char * mntname)
 472 {
 473         int error;
 474         vfs_context_t ctx = vfs_context_kernel();
 475         char fsname[] = "devfs";
 476
 477         error = kernel_mount(fsname, NULLVP, NULLVP, mntname, NULL, 0, MNT_DONTBROWSE, KERNEL_MOUNT_NOAUTH, ctx);
 478         if (error) {
 479                 printf("devfs_kernel_mount: kernel_mount failed: %d\n", error);
 480                 return (error);
 481         }
 482
 483         return (0);
 484 }
 485
 486 struct vfsops devfs_vfsops = {
 487         devfs_mount,
 488         devfs_start,
 489         devfs_unmount,
 490         devfs_root,
 491         NULL,                           /* quotactl */
 492         devfs_vfs_getattr,
 493         devfs_sync,
 494         devfs_vget,
 495         devfs_fhtovp,
 496         devfs_vptofh,
 497         devfs_init,
 498         devfs_sysctl,
 499         NULL,
 500         {NULL}
 501 };