| 1 | /* |
| 2 | * Copyright (c) 1993 Jan-Simon Pendry |
| 3 | * Copyright (c) 1993 |
| 4 | * The Regents of the University of California. All rights reserved. |
| 5 | * |
| 6 | * This code is derived from software contributed to Berkeley by |
| 7 | * Jan-Simon Pendry. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. All advertising materials mentioning features or use of this software |
| 18 | * must display the following acknowledgement: |
| 19 | * This product includes software developed by the University of |
| 20 | * California, Berkeley and its contributors. |
| 21 | * 4. Neither the name of the University nor the names of its contributors |
| 22 | * may be used to endorse or promote products derived from this software |
| 23 | * without specific prior written permission. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 30 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 31 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 32 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 34 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 35 | * SUCH DAMAGE. |
| 36 | * |
| 37 | * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95 |
| 38 | * |
| 39 | * $FreeBSD: src/sys/miscfs/procfs/procfs_vfsops.c,v 1.32.2.1 2001/10/15 20:42:01 des Exp $ |
| 40 | * $DragonFly: src/sys/vfs/procfs/procfs_vfsops.c,v 1.5 2003/08/20 09:56:33 rob Exp $ |
| 41 | */ |
| 42 | |
| 43 | /* |
| 44 | * procfs VFS interface |
| 45 | */ |
| 46 | |
| 47 | #include <sys/param.h> |
| 48 | #include <sys/systm.h> |
| 49 | #include <sys/kernel.h> |
| 50 | #include <sys/proc.h> |
| 51 | #include <sys/mount.h> |
| 52 | #include <sys/vnode.h> |
| 53 | #include <vfs/procfs/procfs.h> |
| 54 | |
| 55 | static int procfs_mount (struct mount *mp, char *path, caddr_t data, |
| 56 | struct nameidata *ndp, struct thread *td); |
| 57 | static int procfs_statfs (struct mount *mp, struct statfs *sbp, |
| 58 | struct thread *td); |
| 59 | static int procfs_unmount (struct mount *mp, int mntflags, |
| 60 | struct thread *td); |
| 61 | |
| 62 | /* |
| 63 | * VFS Operations. |
| 64 | * |
| 65 | * mount system call |
| 66 | */ |
| 67 | /* ARGSUSED */ |
| 68 | static int |
| 69 | procfs_mount(mp, path, data, ndp, td) |
| 70 | struct mount *mp; |
| 71 | char *path; |
| 72 | caddr_t data; |
| 73 | struct nameidata *ndp; |
| 74 | struct thread *td; |
| 75 | { |
| 76 | size_t size; |
| 77 | int error; |
| 78 | |
| 79 | if (mp->mnt_flag & MNT_UPDATE) |
| 80 | return (EOPNOTSUPP); |
| 81 | |
| 82 | if (mp->mnt_vfc->vfc_refcount == 1 && (error = at_exit(procfs_exit))) { |
| 83 | printf("procfs: cannot register procfs_exit with at_exit\n"); |
| 84 | return(error); |
| 85 | } |
| 86 | |
| 87 | mp->mnt_flag |= MNT_LOCAL; |
| 88 | mp->mnt_data = 0; |
| 89 | vfs_getnewfsid(mp); |
| 90 | |
| 91 | (void) copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname, MNAMELEN, &size); |
| 92 | bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); |
| 93 | |
| 94 | size = sizeof("procfs") - 1; |
| 95 | bcopy("procfs", mp->mnt_stat.f_mntfromname, size); |
| 96 | bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); |
| 97 | (void)procfs_statfs(mp, &mp->mnt_stat, td); |
| 98 | |
| 99 | return (0); |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * unmount system call |
| 104 | */ |
| 105 | static int |
| 106 | procfs_unmount(mp, mntflags, td) |
| 107 | struct mount *mp; |
| 108 | int mntflags; |
| 109 | struct thread *td; |
| 110 | { |
| 111 | int error; |
| 112 | int flags = 0; |
| 113 | |
| 114 | if (mntflags & MNT_FORCE) |
| 115 | flags |= FORCECLOSE; |
| 116 | |
| 117 | error = vflush(mp, 0, flags); |
| 118 | if (error) |
| 119 | return (error); |
| 120 | |
| 121 | if (mp->mnt_vfc->vfc_refcount == 1) |
| 122 | rm_at_exit(procfs_exit); |
| 123 | |
| 124 | return (0); |
| 125 | } |
| 126 | |
| 127 | int |
| 128 | procfs_root(mp, vpp) |
| 129 | struct mount *mp; |
| 130 | struct vnode **vpp; |
| 131 | { |
| 132 | |
| 133 | return (procfs_allocvp(mp, vpp, 0, Proot)); |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * Get file system statistics. |
| 138 | */ |
| 139 | static int |
| 140 | procfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) |
| 141 | { |
| 142 | sbp->f_bsize = PAGE_SIZE; |
| 143 | sbp->f_iosize = PAGE_SIZE; |
| 144 | sbp->f_blocks = 1; /* avoid divide by zero in some df's */ |
| 145 | sbp->f_bfree = 0; |
| 146 | sbp->f_bavail = 0; |
| 147 | sbp->f_files = maxproc; /* approx */ |
| 148 | sbp->f_ffree = maxproc - nprocs; /* approx */ |
| 149 | |
| 150 | if (sbp != &mp->mnt_stat) { |
| 151 | sbp->f_type = mp->mnt_vfc->vfc_typenum; |
| 152 | bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); |
| 153 | bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); |
| 154 | bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); |
| 155 | } |
| 156 | |
| 157 | return (0); |
| 158 | } |
| 159 | |
| 160 | static struct vfsops procfs_vfsops = { |
| 161 | procfs_mount, |
| 162 | vfs_stdstart, |
| 163 | procfs_unmount, |
| 164 | procfs_root, |
| 165 | vfs_stdquotactl, |
| 166 | procfs_statfs, |
| 167 | vfs_stdsync, |
| 168 | vfs_stdvget, |
| 169 | vfs_stdfhtovp, |
| 170 | vfs_stdcheckexp, |
| 171 | vfs_stdvptofh, |
| 172 | vfs_stdinit, |
| 173 | vfs_stduninit, |
| 174 | vfs_stdextattrctl, |
| 175 | }; |
| 176 | |
| 177 | VFS_SET(procfs_vfsops, procfs, VFCF_SYNTHETIC); |
| 178 | MODULE_VERSION(procfs, 1); |