procfs_vfsops.c revision 1.26
1 /* $NetBSD: procfs_vfsops.c,v 1.26 1996/12/22 10:10:27 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1993 Jan-Simon Pendry 5 * Copyright (c) 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Jan-Simon Pendry. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)procfs_vfsops.c 8.5 (Berkeley) 6/15/94 40 */ 41 42 /* 43 * procfs VFS interface 44 */ 45 46 #include <sys/param.h> 47 #include <sys/time.h> 48 #include <sys/kernel.h> 49 #include <sys/systm.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 int procfs_mount __P((struct mount *, const char *, void *, 60 struct nameidata *, struct proc *)); 61 int procfs_start __P((struct mount *, int, struct proc *)); 62 int procfs_unmount __P((struct mount *, int, struct proc *)); 63 int procfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 64 struct proc *)); 65 int procfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 66 int procfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 67 int procfs_vget __P((struct mount *, ino_t, struct vnode **)); 68 int procfs_fhtovp __P((struct mount *, struct fid *, struct mbuf *, 69 struct vnode **, int *, struct ucred **)); 70 int procfs_vptofh __P((struct vnode *, struct fid *)); 71 /* 72 * VFS Operations. 73 * 74 * mount system call 75 */ 76 /* ARGSUSED */ 77 int 78 procfs_mount(mp, path, data, ndp, p) 79 struct mount *mp; 80 const char *path; 81 void *data; 82 struct nameidata *ndp; 83 struct proc *p; 84 { 85 size_t size; 86 87 if (UIO_MX & (UIO_MX-1)) { 88 log(LOG_ERR, "procfs: invalid directory entry size"); 89 return (EINVAL); 90 } 91 92 if (mp->mnt_flag & MNT_UPDATE) 93 return (EOPNOTSUPP); 94 95 mp->mnt_flag |= MNT_LOCAL; 96 mp->mnt_data = 0; 97 getnewfsid(mp, makefstype(MOUNT_PROCFS)); 98 99 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN, &size); 100 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 101 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); 102 bcopy("procfs", mp->mnt_stat.f_mntfromname, sizeof("procfs")); 103 return (0); 104 } 105 106 /* 107 * unmount system call 108 */ 109 int 110 procfs_unmount(mp, mntflags, p) 111 struct mount *mp; 112 int mntflags; 113 struct proc *p; 114 { 115 int error; 116 extern int doforce; 117 int flags = 0; 118 119 if (mntflags & MNT_FORCE) { 120 /* procfs can never be rootfs so don't check for it */ 121 if (!doforce) 122 return (EINVAL); 123 flags |= FORCECLOSE; 124 } 125 126 if ((error = vflush(mp, 0, flags)) != 0) 127 return (error); 128 129 return (0); 130 } 131 132 int 133 procfs_root(mp, vpp) 134 struct mount *mp; 135 struct vnode **vpp; 136 { 137 138 return (procfs_allocvp(mp, vpp, 0, Proot)); 139 } 140 141 /* ARGSUSED */ 142 int 143 procfs_start(mp, flags, p) 144 struct mount *mp; 145 int flags; 146 struct proc *p; 147 { 148 149 return (0); 150 } 151 152 /* 153 * Get file system statistics. 154 */ 155 int 156 procfs_statfs(mp, sbp, p) 157 struct mount *mp; 158 struct statfs *sbp; 159 struct proc *p; 160 { 161 162 #ifdef COMPAT_09 163 sbp->f_type = 10; 164 #else 165 sbp->f_type = 0; 166 #endif 167 sbp->f_bsize = PAGE_SIZE; 168 sbp->f_iosize = PAGE_SIZE; 169 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 170 sbp->f_bfree = 0; 171 sbp->f_bavail = 0; 172 sbp->f_files = maxproc; /* approx */ 173 sbp->f_ffree = maxproc - nprocs; /* approx */ 174 if (sbp != &mp->mnt_stat) { 175 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 176 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 177 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 178 } 179 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 180 return (0); 181 } 182 183 /*ARGSUSED*/ 184 int 185 procfs_quotactl(mp, cmds, uid, arg, p) 186 struct mount *mp; 187 int cmds; 188 uid_t uid; 189 caddr_t arg; 190 struct proc *p; 191 { 192 193 return (EOPNOTSUPP); 194 } 195 196 /*ARGSUSED*/ 197 int 198 procfs_sync(mp, waitfor, uc, p) 199 struct mount *mp; 200 int waitfor; 201 struct ucred *uc; 202 struct proc *p; 203 { 204 205 return (0); 206 } 207 208 /*ARGSUSED*/ 209 int 210 procfs_vget(mp, ino, vpp) 211 struct mount *mp; 212 ino_t ino; 213 struct vnode **vpp; 214 { 215 216 return (EOPNOTSUPP); 217 } 218 219 /*ARGSUSED*/ 220 int 221 procfs_fhtovp(mp, fhp, mb, vpp, what, anon) 222 struct mount *mp; 223 struct fid *fhp; 224 struct mbuf *mb; 225 struct vnode **vpp; 226 int *what; 227 struct ucred **anon; 228 { 229 230 return (EINVAL); 231 } 232 233 /*ARGSUSED*/ 234 int 235 procfs_vptofh(vp, fhp) 236 struct vnode *vp; 237 struct fid *fhp; 238 { 239 240 return (EINVAL); 241 } 242 243 void 244 procfs_init() 245 { 246 } 247 248 struct vfsops procfs_vfsops = { 249 MOUNT_PROCFS, 250 procfs_mount, 251 procfs_start, 252 procfs_unmount, 253 procfs_root, 254 procfs_quotactl, 255 procfs_statfs, 256 procfs_sync, 257 procfs_vget, 258 procfs_fhtovp, 259 procfs_vptofh, 260 procfs_init, 261 }; 262
Indexes created Mon Sep 29 21:09:56 GMT 2025