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 #include <sys/conf.h>
  79 #include <libkern/OSAtomic.h>
  80 #include <atm/atm_internal.h>
  81
  82 #if CONFIG_MACF
  83 #include <security/mac_framework.h>
  84 #endif
  85
  86 #include "devfs.h"
  87 #include "devfsdefs.h"
  88
  89 #if FDESC
  90 #include "fdesc.h"
  91 #endif /* FDESC */
  92
  93
  94 static int devfs_statfs( struct mount *mp, struct vfsstatfs *sbp, vfs_context_t ctx);
  95 static int devfs_vfs_getattr(mount_t mp, struct vfs_attr *fsap, vfs_context_t ctx);
  96
  97 #if CONFIG_DEV_KMEM
  98 extern boolean_t dev_kmem_enabled;
  99 #endif
 100
 101 /*-
 102  * Called from the generic VFS startups.
 103  * This is the second stage of DEVFS initialisation.
 104  * The probed devices have already been loaded and the
 105  * basic structure of the DEVFS created.
 106  * We take the oportunity to mount the hidden DEVFS layer, so that
 107  * devices from devfs get sync'd.
 108  */
 109 static int
 110 devfs_init(__unused struct vfsconf *vfsp)
 111 {
 112         if (devfs_sinit())
 113                 return (ENOTSUP);
 114         devfs_make_node(makedev(0, 0), DEVFS_CHAR,
 115                                         UID_ROOT, GID_WHEEL, 0622, "console");
 116         devfs_make_node(makedev(2, 0), DEVFS_CHAR,
 117                                         UID_ROOT, GID_WHEEL, 0666, "tty");
 118 #if CONFIG_DEV_KMEM
 119         if (dev_kmem_enabled) {
 120                 /* (3,0) reserved for /dev/mem physical memory */
 121                 devfs_make_node(makedev(3, 1), DEVFS_CHAR,
 122                                                 UID_ROOT, GID_KMEM, 0640, "kmem");
 123         }
 124 #endif
 125         devfs_make_node(makedev(3, 2), DEVFS_CHAR,
 126                                         UID_ROOT, GID_WHEEL, 0666, "null");
 127         devfs_make_node(makedev(3, 3), DEVFS_CHAR,
 128                                         UID_ROOT, GID_WHEEL, 0666, "zero");
 129         uint32_t logging_config = atm_get_diagnostic_config();
 130
 131         devfs_make_node(makedev(6, 0), DEVFS_CHAR,
 132                                         UID_ROOT, GID_WHEEL, 0600, "klog");
 133
 134         if ( !(logging_config & ATM_TRACE_DISABLE) ) {
 135                 devfs_make_node(makedev(7, 0), DEVFS_CHAR,
 136                                         UID_ROOT, GID_WHEEL, 0600, "oslog");
 137                 if (cdevsw_setkqueueok(7, (&(cdevsw[7])), 0) == -1) {
 138                         return (ENOTSUP);
 139                 }
 140
 141                 devfs_make_node(makedev(8, 0), DEVFS_CHAR,
 142                                         UID_ROOT, GID_WHEEL, 0600, "oslog_stream");
 143                 if (cdevsw_setkqueueok(8, (&(cdevsw[8])), 0) == -1) {
 144                         return (ENOTSUP);
 145                 }
 146         }
 147
 148
 149 #if  FDESC
 150         devfs_fdesc_init();
 151 #endif
 152
 153     return 0;
 154 }
 155
 156 /*-
 157  *  mp   - pointer to 'mount' structure
 158  *  path - addr in user space of mount point (ie /usr or whatever)
 159  *  data - addr in user space of mount params including the
 160  *         name of the block special file to treat as a filesystem.
 161  *         (NOT USED)
 162  *  ndp  - namei data pointer (NOT USED)
 163  *  p    - proc pointer
 164  * devfs is special in that it doesn't require any device to be mounted..
 165  * It makes up its data as it goes along.
 166  * it must be mounted during single user.. until it is, only std{in/out/err}
 167  * and the root filesystem are available.
 168  */
 169 /*proto*/
 170 int
 171 devfs_mount(struct mount *mp, __unused vnode_t devvp, __unused user_addr_t data, vfs_context_t ctx)
 172 {
 173         struct devfsmount *devfs_mp_p;  /* devfs specific mount info */
 174         int error;
 175
 176         /*-
 177          *  If they just want to update, we don't need to do anything.
 178          */
 179         if (mp->mnt_flag & MNT_UPDATE)
 180         {
 181                 return 0;
 182         }
 183
 184         /* Advisory locking should be handled at the VFS layer */
 185         vfs_setlocklocal(mp);
 186
 187         /*-
 188          *  Well, it's not an update, it's a real mount request.
 189          *  Time to get dirty.
 190          * HERE we should check to see if we are already mounted here.
 191          */
 192
 193         MALLOC(devfs_mp_p, struct devfsmount *, sizeof(struct devfsmount),
 194                M_DEVFSMNT, M_WAITOK);
 195         if (devfs_mp_p == NULL)
 196                 return (ENOMEM);
 197         bzero(devfs_mp_p,sizeof(*devfs_mp_p));
 198         devfs_mp_p->mount = mp;
 199
 200         /*-
 201          *  Fill out some fields
 202          */
 203         __IGNORE_WCASTALIGN(mp->mnt_data = (qaddr_t)devfs_mp_p);
 204         mp->mnt_vfsstat.f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p;
 205         mp->mnt_vfsstat.f_fsid.val[1] = vfs_typenum(mp);
 206         mp->mnt_flag |= MNT_LOCAL;
 207
 208         DEVFS_LOCK();
 209         error = dev_dup_plane(devfs_mp_p);
 210         DEVFS_UNLOCK();
 211
 212         if (error) {
 213                 mp->mnt_data = (qaddr_t)0;
 214                 FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
 215                 return (error);
 216         } else
 217                 DEVFS_INCR_MOUNTS();
 218
 219         /*-
 220          *  Copy in the name of the directory the filesystem
 221          *  is to be mounted on.
 222          *  And we clear the remainder of the character strings
 223          *  to be tidy.
 224          */
 225
 226         bzero(mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN);
 227         bcopy("devfs",mp->mnt_vfsstat.f_mntfromname, 5);
 228         (void)devfs_statfs(mp, &mp->mnt_vfsstat, ctx);
 229
 230         return 0;
 231 }
 232
 233
 234 static int
 235 devfs_start(__unused struct mount *mp, __unused int flags, __unused vfs_context_t ctx)
 236 {
 237         return 0;
 238 }
 239
 240 /*-
 241  *  Unmount the filesystem described by mp.
 242  */
 243 static int
 244 devfs_unmount( struct mount *mp, int mntflags, __unused vfs_context_t ctx)
 245 {
 246         struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
 247         int flags = 0;
 248         int force = 0;
 249         int error;
 250
 251         if (mntflags & MNT_FORCE) {
 252                 flags |= FORCECLOSE;
 253                 force = 1;
 254         }
 255         error = vflush(mp, NULLVP, flags);
 256         if (error && !force)
 257                 return error;
 258
 259         DEVFS_LOCK();
 260         devfs_free_plane(devfs_mp_p);
 261         DEVFS_UNLOCK();
 262
 263         DEVFS_DECR_MOUNTS();
 264
 265         FREE((caddr_t)devfs_mp_p, M_DEVFSMNT);
 266         mp->mnt_data = (qaddr_t)0;
 267         mp->mnt_flag &= ~MNT_LOCAL;
 268
 269         return 0;
 270 }
 271
 272 /* return the address of the root vnode  in *vpp */
 273 static int
 274 devfs_root(struct mount *mp, struct vnode **vpp, __unused vfs_context_t ctx)
 275 {
 276         struct devfsmount *devfs_mp_p = (struct devfsmount *)(mp->mnt_data);
 277         int error;
 278
 279         DEVFS_LOCK();
 280         /* last parameter to devfs_dntovn() is ignored */
 281         error = devfs_dntovn(devfs_mp_p->plane_root->de_dnp, vpp, NULL);
 282         DEVFS_UNLOCK();
 283
 284         return error;
 285 }
 286
 287 static int
 288 devfs_statfs( struct mount *mp, struct vfsstatfs *sbp, __unused vfs_context_t ctx)
 289 {
 290         struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
 291
 292         /*-
 293          *  Fill in the stat block.
 294          */
 295         //sbp->f_type   = mp->mnt_vfsstat.f_type;
 296         sbp->f_flags  = 0;              /* XXX */
 297         sbp->f_bsize  = 512;
 298         sbp->f_iosize = 512;
 299         sbp->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
 300                          + devfs_stats.nodes * sizeof(devnode_t)
 301                          + devfs_stats.entries * sizeof(devdirent_t)
 302                          + devfs_stats.stringspace
 303                          ) / sbp->f_bsize;
 304         sbp->f_bfree  = 0;
 305         sbp->f_bavail = 0;
 306         sbp->f_files  = devfs_stats.nodes;
 307         sbp->f_ffree  = 0;
 308         sbp->f_fsid.val[0] = (int32_t)(uintptr_t)devfs_mp_p;
 309         sbp->f_fsid.val[1] = vfs_typenum(mp);
 310
 311         return 0;
 312 }
 313
 314 static int
 315 devfs_vfs_getattr(__unused mount_t mp, struct vfs_attr *fsap, __unused vfs_context_t ctx)
 316 {
 317         VFSATTR_RETURN(fsap, f_objcount, devfs_stats.nodes);
 318         VFSATTR_RETURN(fsap, f_maxobjcount, devfs_stats.nodes);
 319         VFSATTR_RETURN(fsap, f_bsize, 512);
 320         VFSATTR_RETURN(fsap, f_iosize, 512);
 321         if (VFSATTR_IS_ACTIVE(fsap, f_blocks) || VFSATTR_IS_ACTIVE(fsap, f_bused)) {
 322                 fsap->f_blocks = (devfs_stats.mounts * sizeof(struct devfsmount)
 323                          + devfs_stats.nodes * sizeof(devnode_t)
 324                          + devfs_stats.entries * sizeof(devdirent_t)
 325                          + devfs_stats.stringspace
 326                          ) / fsap->f_bsize;
 327                 fsap->f_bused = fsap->f_blocks;
 328                 VFSATTR_SET_SUPPORTED(fsap, f_blocks);
 329                 VFSATTR_SET_SUPPORTED(fsap, f_bused);
 330         }
 331         VFSATTR_RETURN(fsap, f_bfree, 0);
 332         VFSATTR_RETURN(fsap, f_bavail, 0);
 333         VFSATTR_RETURN(fsap, f_files, devfs_stats.nodes);
 334         VFSATTR_RETURN(fsap, f_ffree, 0);
 335         VFSATTR_RETURN(fsap, f_fssubtype, 0);
 336
 337         if (VFSATTR_IS_ACTIVE(fsap, f_capabilities)) {
 338                 fsap->f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] =
 339                         VOL_CAP_FMT_SYMBOLICLINKS |
 340                         VOL_CAP_FMT_HARDLINKS |
 341                         VOL_CAP_FMT_NO_ROOT_TIMES |
 342                         VOL_CAP_FMT_CASE_SENSITIVE |
 343                         VOL_CAP_FMT_CASE_PRESERVING |
 344                         VOL_CAP_FMT_FAST_STATFS |
 345                         VOL_CAP_FMT_2TB_FILESIZE |
 346                         VOL_CAP_FMT_HIDDEN_FILES;
 347                 fsap->f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] =
 348                         VOL_CAP_INT_ATTRLIST ;
 349                 fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED1] = 0;
 350                 fsap->f_capabilities.capabilities[VOL_CAPABILITIES_RESERVED2] = 0;
 351
 352                 fsap->f_capabilities.valid[VOL_CAPABILITIES_FORMAT] =
 353                         VOL_CAP_FMT_PERSISTENTOBJECTIDS |
 354                         VOL_CAP_FMT_SYMBOLICLINKS |
 355                         VOL_CAP_FMT_HARDLINKS |
 356                         VOL_CAP_FMT_JOURNAL |
 357                         VOL_CAP_FMT_JOURNAL_ACTIVE |
 358                         VOL_CAP_FMT_NO_ROOT_TIMES |
 359                         VOL_CAP_FMT_SPARSE_FILES |
 360                         VOL_CAP_FMT_ZERO_RUNS |
 361                         VOL_CAP_FMT_CASE_SENSITIVE |
 362                         VOL_CAP_FMT_CASE_PRESERVING |
 363                         VOL_CAP_FMT_FAST_STATFS |
 364                         VOL_CAP_FMT_2TB_FILESIZE |
 365                         VOL_CAP_FMT_OPENDENYMODES |
 366                         VOL_CAP_FMT_HIDDEN_FILES |
 367                         VOL_CAP_FMT_PATH_FROM_ID |
 368                         VOL_CAP_FMT_NO_VOLUME_SIZES;
 369                 fsap->f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] =
 370                         VOL_CAP_INT_SEARCHFS |
 371                         VOL_CAP_INT_ATTRLIST |
 372                         VOL_CAP_INT_NFSEXPORT |
 373                         VOL_CAP_INT_READDIRATTR |
 374                         VOL_CAP_INT_EXCHANGEDATA |
 375                         VOL_CAP_INT_COPYFILE |
 376                         VOL_CAP_INT_ALLOCATE |
 377                         VOL_CAP_INT_VOL_RENAME |
 378                         VOL_CAP_INT_ADVLOCK |
 379                         VOL_CAP_INT_FLOCK |
 380                         VOL_CAP_INT_EXTENDED_SECURITY |
 381                         VOL_CAP_INT_USERACCESS |
 382                         VOL_CAP_INT_MANLOCK |
 383                         VOL_CAP_INT_EXTENDED_ATTR |
 384                         VOL_CAP_INT_NAMEDSTREAMS;
 385                 fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED1] = 0;
 386                 fsap->f_capabilities.valid[VOL_CAPABILITIES_RESERVED2] = 0;
 387
 388                 VFSATTR_SET_SUPPORTED(fsap, f_capabilities);
 389         }
 390
 391         if (VFSATTR_IS_ACTIVE(fsap, f_attributes)) {
 392                 fsap->f_attributes.validattr.commonattr =
 393                         ATTR_CMN_NAME | ATTR_CMN_DEVID | ATTR_CMN_FSID |
 394                         ATTR_CMN_OBJTYPE | ATTR_CMN_OBJTAG | ATTR_CMN_OBJID |
 395                         ATTR_CMN_PAROBJID |
 396                         ATTR_CMN_MODTIME | ATTR_CMN_CHGTIME | ATTR_CMN_ACCTIME |
 397                         ATTR_CMN_OWNERID | ATTR_CMN_GRPID | ATTR_CMN_ACCESSMASK |
 398                         ATTR_CMN_FLAGS | ATTR_CMN_USERACCESS | ATTR_CMN_FILEID;
 399                 fsap->f_attributes.validattr.volattr =
 400                         ATTR_VOL_FSTYPE | ATTR_VOL_SIZE | ATTR_VOL_SPACEFREE |
 401                         ATTR_VOL_SPACEAVAIL | ATTR_VOL_MINALLOCATION |
 402                         ATTR_VOL_OBJCOUNT | ATTR_VOL_MAXOBJCOUNT |
 403                         ATTR_VOL_MOUNTPOINT | ATTR_VOL_MOUNTFLAGS |
 404                         ATTR_VOL_MOUNTEDDEVICE | ATTR_VOL_CAPABILITIES |
 405                         ATTR_VOL_ATTRIBUTES;
 406                 fsap->f_attributes.validattr.dirattr =
 407                         ATTR_DIR_LINKCOUNT | ATTR_DIR_MOUNTSTATUS;
 408                 fsap->f_attributes.validattr.fileattr =
 409                         ATTR_FILE_LINKCOUNT | ATTR_FILE_TOTALSIZE |
 410                         ATTR_FILE_IOBLOCKSIZE | ATTR_FILE_DEVTYPE |
 411                         ATTR_FILE_DATALENGTH;
 412                 fsap->f_attributes.validattr.forkattr = 0;
 413
 414                 fsap->f_attributes.nativeattr.commonattr =
 415                         ATTR_CMN_NAME | ATTR_CMN_DEVID | ATTR_CMN_FSID |
 416                         ATTR_CMN_OBJTYPE | ATTR_CMN_OBJTAG | ATTR_CMN_OBJID |
 417                         ATTR_CMN_PAROBJID |
 418                         ATTR_CMN_MODTIME | ATTR_CMN_CHGTIME | ATTR_CMN_ACCTIME |
 419                         ATTR_CMN_OWNERID | ATTR_CMN_GRPID | ATTR_CMN_ACCESSMASK |
 420                         ATTR_CMN_FLAGS | ATTR_CMN_USERACCESS | ATTR_CMN_FILEID;
 421                 fsap->f_attributes.nativeattr.volattr =
 422                         ATTR_VOL_FSTYPE | ATTR_VOL_SIZE | ATTR_VOL_SPACEFREE |
 423                         ATTR_VOL_SPACEAVAIL | ATTR_VOL_MINALLOCATION |
 424                         ATTR_VOL_OBJCOUNT | ATTR_VOL_MAXOBJCOUNT |
 425                         ATTR_VOL_MOUNTPOINT | ATTR_VOL_MOUNTFLAGS |
 426                         ATTR_VOL_MOUNTEDDEVICE | ATTR_VOL_CAPABILITIES |
 427                         ATTR_VOL_ATTRIBUTES;
 428                 fsap->f_attributes.nativeattr.dirattr =
 429                         ATTR_DIR_MOUNTSTATUS;
 430                 fsap->f_attributes.nativeattr.fileattr =
 431                         ATTR_FILE_LINKCOUNT | ATTR_FILE_TOTALSIZE |
 432                         ATTR_FILE_IOBLOCKSIZE | ATTR_FILE_DEVTYPE |
 433                         ATTR_FILE_DATALENGTH;
 434                 fsap->f_attributes.nativeattr.forkattr = 0;
 435
 436                 VFSATTR_SET_SUPPORTED(fsap, f_attributes);
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int
 443 devfs_sync(__unused struct mount *mp, __unused int waitfor, __unused vfs_context_t ctx)
 444 {
 445     return (0);
 446 }
 447
 448
 449 static int
 450 devfs_vget(__unused struct mount *mp, __unused ino64_t ino, __unused struct vnode **vpp, __unused vfs_context_t ctx)
 451 {
 452         return ENOTSUP;
 453 }
 454
 455 /*************************************************************
 456  * The concept of exporting a kernel generated devfs is stupid
 457  * So don't handle filehandles
 458  */
 459
 460 static int
 461 devfs_fhtovp (__unused struct mount *mp, __unused int fhlen, __unused unsigned char *fhp, __unused struct vnode **vpp, __unused vfs_context_t ctx)
 462 {
 463         return (EINVAL);
 464 }
 465
 466
 467 static int
 468 devfs_vptofh (__unused struct vnode *vp, __unused int *fhlenp, __unused unsigned char *fhp, __unused vfs_context_t ctx)
 469 {
 470         return (EINVAL);
 471 }
 472
 473 static int
 474 devfs_sysctl(__unused int *name, __unused u_int namelen, __unused user_addr_t oldp,
 475              __unused size_t *oldlenp, __unused user_addr_t newp,
 476              __unused size_t newlen, __unused vfs_context_t ctx)
 477 {
 478     return (ENOTSUP);
 479 }
 480
 481 #include <sys/namei.h>
 482
 483 /*
 484  * Function: devfs_kernel_mount
 485  * Purpose:
 486  *   Mount devfs at the given mount point from within the kernel.
 487  */
 488 int
 489 devfs_kernel_mount(char * mntname)
 490 {
 491         int error;
 492         vfs_context_t ctx = vfs_context_kernel();
 493         char fsname[] = "devfs";
 494
 495         error = kernel_mount(fsname, NULLVP, NULLVP, mntname, NULL, 0, MNT_DONTBROWSE, KERNEL_MOUNT_NOAUTH, ctx);
 496         if (error) {
 497                 printf("devfs_kernel_mount: kernel_mount failed: %d\n", error);
 498                 return (error);
 499         }
 500
 501         return (0);
 502 }
 503
 504 struct vfsops devfs_vfsops = {
 505         .vfs_mount   = devfs_mount,
 506         .vfs_start   = devfs_start,
 507         .vfs_unmount = devfs_unmount,
 508         .vfs_root    = devfs_root,
 509         .vfs_getattr = devfs_vfs_getattr,
 510         .vfs_sync    = devfs_sync,
 511         .vfs_vget    = devfs_vget,
 512         .vfs_fhtovp  = devfs_fhtovp,
 513         .vfs_vptofh  = devfs_vptofh,
 514         .vfs_init    = devfs_init,
 515         .vfs_sysctl  = devfs_sysctl,
 516         // There are other VFS ops that we do not support
 517 };