bsd/miscfs/procfs/procfs_vfsops.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*      $NetBSD: procfs_vfsops.c,v 1.23 1995/03/09 12:05:54 mycroft Exp $       */
  23
  24 /*
  25  * Copyright (c) 1993 Jan-Simon Pendry
  26  * Copyright (c) 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * This code is derived from software contributed to Berkeley by
  30  * Jan-Simon Pendry.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are 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
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)procfs_vfsops.c     8.5 (Berkeley) 6/15/94
  61  */
  62
  63 /*
  64  * procfs VFS interface
  65  */
  66
  67 #include <sys/param.h>
  68 #include <sys/time.h>
  69 #include <sys/kernel.h>
  70 #include <sys/proc.h>
  71 #include <sys/buf.h>
  72 #include <sys/syslog.h>
  73 #include <sys/mount.h>
  74 #include <sys/signalvar.h>
  75 #include <sys/vnode.h>
  76 #include <miscfs/procfs/procfs.h>
  77 #include <vm/vm.h>                      /* for PAGE_SIZE */
  78
  79 /*
  80  * VFS Operations.
  81  *
  82  * mount system call
  83  */
  84 /* ARGSUSED */
  85 procfs_mount(mp, path, data, ndp, p)
  86         struct mount *mp;
  87         char *path;
  88         caddr_t data;
  89         struct nameidata *ndp;
  90         struct proc *p;
  91 {
  92         size_t size;
  93
  94         if (UIO_MX & (UIO_MX-1)) {
  95                 log(LOG_ERR, "procfs: invalid directory entry size");
  96                 return (EINVAL);
  97         }
  98
  99         if (mp->mnt_flag & MNT_UPDATE)
 100                 return (EOPNOTSUPP);
 101
 102         mp->mnt_flag |= MNT_LOCAL;
 103         mp->mnt_data = 0;
 104         getnewfsid(mp, makefstype(MOUNT_PROCFS));
 105
 106         (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN, &size);
 107         bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
 108         bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
 109         bcopy("procfs", mp->mnt_stat.f_mntfromname, sizeof("procfs"));
 110         return (0);
 111 }
 112
 113 /*
 114  * unmount system call
 115  */
 116 procfs_unmount(mp, mntflags, p)
 117         struct mount *mp;
 118         int mntflags;
 119         struct proc *p;
 120 {
 121         int error;
 122         extern int doforce;
 123         int flags = 0;
 124
 125         if (mntflags & MNT_FORCE) {
 126                 /* procfs can never be rootfs so don't check for it */
 127                 if (!doforce)
 128                         return (EINVAL);
 129                 flags |= FORCECLOSE;
 130         }
 131
 132         if (error = vflush(mp, 0, flags))
 133                 return (error);
 134
 135         return (0);
 136 }
 137
 138 procfs_root(mp, vpp)
 139         struct mount *mp;
 140         struct vnode **vpp;
 141 {
 142
 143         return (procfs_allocvp(mp, vpp, 0, Proot));
 144 }
 145
 146 /* ARGSUSED */
 147 procfs_start(mp, flags, p)
 148         struct mount *mp;
 149         int flags;
 150         struct proc *p;
 151 {
 152
 153         return (0);
 154 }
 155
 156 /*
 157  * Get file system statistics.
 158  */
 159 procfs_statfs(mp, sbp, p)
 160         struct mount *mp;
 161         struct statfs *sbp;
 162         struct proc *p;
 163 {
 164
 165 #ifdef COMPAT_09
 166         sbp->f_type = 10;
 167 #else
 168         sbp->f_type = 0;
 169 #endif
 170         sbp->f_bsize = PAGE_SIZE;
 171         sbp->f_iosize = PAGE_SIZE;
 172         sbp->f_blocks = 1;      /* avoid divide by zero in some df's */
 173         sbp->f_bfree = 0;
 174         sbp->f_bavail = 0;
 175         sbp->f_files = maxproc;                 /* approx */
 176         sbp->f_ffree = maxproc - nprocs;        /* approx */
 177         if (sbp != &mp->mnt_stat) {
 178                 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
 179                 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
 180                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
 181         }
 182         strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
 183         sbp->f_fstypename[MFSNAMELEN] = '\0';
 184         return (0);
 185 }
 186
 187 procfs_quotactl(mp, cmds, uid, arg, p)
 188         struct mount *mp;
 189         int cmds;
 190         uid_t uid;
 191         caddr_t arg;
 192         struct proc *p;
 193 {
 194
 195         return (EOPNOTSUPP);
 196 }
 197
 198 procfs_sync(mp, waitfor)
 199         struct mount *mp;
 200         int waitfor;
 201 {
 202
 203         return (0);
 204 }
 205
 206 procfs_vget(mp, ino, vpp)
 207         struct mount *mp;
 208         ino_t ino;
 209         struct vnode **vpp;
 210 {
 211
 212         return (EOPNOTSUPP);
 213 }
 214
 215 procfs_fhtovp(mp, fhp, vpp)
 216         struct mount *mp;
 217         struct fid *fhp;
 218         struct vnode **vpp;
 219 {
 220
 221         return (EINVAL);
 222 }
 223
 224 procfs_vptofh(vp, fhp)
 225         struct vnode *vp;
 226         struct fid *fhp;
 227 {
 228
 229         return (EINVAL);
 230 }
 231
 232 procfs_init()
 233 {
 234
 235         return (0);
 236 }
 237
 238 struct vfsops procfs_vfsops = {
 239         MOUNT_PROCFS,
 240         procfs_mount,
 241         procfs_start,
 242         procfs_unmount,
 243         procfs_root,
 244         procfs_quotactl,
 245         procfs_statfs,
 246         procfs_sync,
 247         procfs_vget,
 248         procfs_fhtovp,
 249         procfs_vptofh,
 250         procfs_init,
 251 };