procfs_vfsops.c revision 1.1.1.1
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 8.4 (Berkeley) 1/21/94 38 * 39 * From: 40 * $Id: procfs_vfsops.c,v 1.1.1.1 1998/03/01 02:10:02 fvdl Exp $ 41 */ 42 43 /* 44 * procfs VFS interface 45 */ 46 47 #include <sys/param.h> 48 #include <sys/time.h> 49 #include <sys/kernel.h> 50 #include <sys/proc.h> 51 #include <sys/buf.h> 52 #include <sys/syslog.h> 53 #include <sys/mount.h> 54 #include <sys/signalvar.h> 55 #include <sys/vnode.h> 56 #include <miscfs/procfs/procfs.h> 57 #include <vm/vm.h> /* for PAGE_SIZE */ 58 59 /* 60 * VFS Operations. 61 * 62 * mount system call 63 */ 64 /* ARGSUSED */ 65 procfs_mount(mp, path, data, ndp, p) 66 struct mount *mp; 67 char *path; 68 caddr_t data; 69 struct nameidata *ndp; 70 struct proc *p; 71 { 72 u_int size; 73 74 if (UIO_MX & (UIO_MX-1)) { 75 log(LOG_ERR, "procfs: invalid directory entry size"); 76 return (EINVAL); 77 } 78 79 if (mp->mnt_flag & MNT_UPDATE) 80 return (EOPNOTSUPP); 81 82 mp->mnt_flag |= MNT_LOCAL; 83 mp->mnt_data = 0; 84 getnewfsid(mp, MOUNT_PROCFS); 85 86 (void) copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname, MNAMELEN, &size); 87 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 88 89 size = sizeof("procfs") - 1; 90 bcopy("procfs", mp->mnt_stat.f_mntfromname, size); 91 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 92 93 return (0); 94 } 95 96 /* 97 * unmount system call 98 */ 99 procfs_unmount(mp, mntflags, p) 100 struct mount *mp; 101 int mntflags; 102 struct proc *p; 103 { 104 int error; 105 extern int doforce; 106 int flags = 0; 107 108 if (mntflags & MNT_FORCE) { 109 /* procfs can never be rootfs so don't check for it */ 110 if (!doforce) 111 return (EINVAL); 112 flags |= FORCECLOSE; 113 } 114 115 if (error = vflush(mp, 0, flags)) 116 return (error); 117 118 return (0); 119 } 120 121 procfs_root(mp, vpp) 122 struct mount *mp; 123 struct vnode **vpp; 124 { 125 struct pfsnode *pfs; 126 struct vnode *vp; 127 int error; 128 129 error = procfs_allocvp(mp, &vp, (pid_t) 0, Proot); 130 if (error) 131 return (error); 132 133 vp->v_type = VDIR; 134 vp->v_flag = VROOT; 135 pfs = VTOPFS(vp); 136 137 *vpp = vp; 138 return (0); 139 } 140 141 /* 142 */ 143 /* ARGSUSED */ 144 procfs_start(mp, flags, p) 145 struct mount *mp; 146 int flags; 147 struct proc *p; 148 { 149 150 return (0); 151 } 152 153 /* 154 * Get file system statistics. 155 */ 156 procfs_statfs(mp, sbp, p) 157 struct mount *mp; 158 struct statfs *sbp; 159 struct proc *p; 160 { 161 sbp->f_type = MOUNT_PROCFS; 162 sbp->f_bsize = PAGE_SIZE; 163 sbp->f_iosize = PAGE_SIZE; 164 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 165 sbp->f_bfree = 0; 166 sbp->f_bavail = 0; 167 sbp->f_files = maxproc; /* approx */ 168 sbp->f_ffree = maxproc - nprocs; /* approx */ 169 170 if (sbp != &mp->mnt_stat) { 171 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 172 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 173 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 174 } 175 176 return (0); 177 } 178 179 180 procfs_quotactl(mp, cmds, uid, arg, p) 181 struct mount *mp; 182 int cmds; 183 uid_t uid; 184 caddr_t arg; 185 struct proc *p; 186 { 187 188 return (EOPNOTSUPP); 189 } 190 191 procfs_sync(mp, waitfor) 192 struct mount *mp; 193 int waitfor; 194 { 195 196 return (0); 197 } 198 199 procfs_vget(mp, ino, vpp) 200 struct mount *mp; 201 ino_t ino; 202 struct vnode **vpp; 203 { 204 205 return (EOPNOTSUPP); 206 } 207 208 procfs_fhtovp(mp, fhp, vpp) 209 struct mount *mp; 210 struct fid *fhp; 211 struct vnode **vpp; 212 { 213 214 return (EINVAL); 215 } 216 217 procfs_vptofh(vp, fhp) 218 struct vnode *vp; 219 struct fid *fhp; 220 { 221 222 return EINVAL; 223 } 224 225 procfs_init() 226 { 227 228 return (0); 229 } 230 231 struct vfsops procfs_vfsops = { 232 procfs_mount, 233 procfs_start, 234 procfs_unmount, 235 procfs_root, 236 procfs_quotactl, 237 procfs_statfs, 238 procfs_sync, 239 procfs_vget, 240 procfs_fhtovp, 241 procfs_vptofh, 242 procfs_init, 243 }; 244
Indexes created Mon Sep 29 21:09:56 GMT 2025