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 1.10 2004/12/17 00:18:34 dillon 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 extern struct vnodeopv_entry_desc procfs_vnodeop_entries[]; 56 57 static int procfs_mount (struct mount *mp, char *path, caddr_t data, 58 struct thread *td); 59 static int procfs_statfs (struct mount *mp, struct statfs *sbp, 60 struct thread *td); 61 static int procfs_unmount (struct mount *mp, int mntflags, 62 struct thread *td); 63 64 /* 65 * VFS Operations. 66 * 67 * mount system call 68 */ 69 /* ARGSUSED */ 70 static int 71 procfs_mount(struct mount *mp, char *path, caddr_t data, struct thread *td) 72 { 73 size_t size; 74 int error; 75 76 if (mp->mnt_flag & MNT_UPDATE) 77 return (EOPNOTSUPP); 78 79 if (mp->mnt_vfc->vfc_refcount == 1 && (error = at_exit(procfs_exit))) { 80 printf("procfs: cannot register procfs_exit with at_exit\n"); 81 return(error); 82 } 83 84 mp->mnt_flag |= MNT_LOCAL; 85 mp->mnt_data = 0; 86 vfs_getnewfsid(mp); 87 88 (void) copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname, MNAMELEN, &size); 89 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 90 91 size = sizeof("procfs") - 1; 92 bcopy("procfs", mp->mnt_stat.f_mntfromname, size); 93 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 94 procfs_statfs(mp, &mp->mnt_stat, td); 95 vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops, procfs_vnodeop_entries); 96 97 return (0); 98 } 99 100 /* 101 * unmount system call 102 */ 103 static int 104 procfs_unmount(struct mount *mp, int mntflags, struct thread *td) 105 { 106 int error; 107 int flags = 0; 108 109 if (mntflags & MNT_FORCE) 110 flags |= FORCECLOSE; 111 112 error = vflush(mp, 0, flags); 113 if (error) 114 return (error); 115 116 if (mp->mnt_vfc->vfc_refcount == 1) 117 rm_at_exit(procfs_exit); 118 119 return (0); 120 } 121 122 /* 123 * Sets *vpp to the root procfs vnode, referenced and exclusively locked. 124 */ 125 int 126 procfs_root(struct mount *mp, struct vnode **vpp) 127 { 128 return (procfs_allocvp(mp, vpp, 0, Proot)); 129 } 130 131 /* 132 * Get file system statistics. 133 */ 134 static int 135 procfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 136 { 137 sbp->f_bsize = PAGE_SIZE; 138 sbp->f_iosize = PAGE_SIZE; 139 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 140 sbp->f_bfree = 0; 141 sbp->f_bavail = 0; 142 sbp->f_files = maxproc; /* approx */ 143 sbp->f_ffree = maxproc - nprocs; /* approx */ 144 145 if (sbp != &mp->mnt_stat) { 146 sbp->f_type = mp->mnt_vfc->vfc_typenum; 147 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 148 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 149 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 150 } 151 152 return (0); 153 } 154 155 static struct vfsops procfs_vfsops = { 156 procfs_mount, 157 vfs_stdstart, 158 procfs_unmount, 159 procfs_root, 160 vfs_stdquotactl, 161 procfs_statfs, 162 vfs_stdsync, 163 vfs_stdvget, 164 vfs_stdfhtovp, 165 vfs_stdcheckexp, 166 vfs_stdvptofh, 167 vfs_stdinit, 168 vfs_stduninit, 169 vfs_stdextattrctl, 170 }; 171 172 VFS_SET(procfs_vfsops, procfs, VFCF_SYNTHETIC); 173 MODULE_VERSION(procfs, 1); 174