1 /* $NetBSD: procfs_vfsops.c,v 1.41 2001/11/10 13:33:44 lukem 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 8.7 (Berkeley) 5/10/95 40 */ 41 42 /* 43 * procfs VFS interface 44 */ 45 46 #include <sys/cdefs.h> 47 __KERNEL_RCSID(0, "$NetBSD: procfs_vfsops.c,v 1.41 2001/11/10 13:33:44 lukem Exp $"); 48 49 #if defined(_KERNEL_OPT) 50 #include "opt_compat_netbsd.h" 51 #endif 52 53 #include <sys/param.h> 54 #include <sys/time.h> 55 #include <sys/kernel.h> 56 #include <sys/systm.h> 57 #include <sys/proc.h> 58 #include <sys/buf.h> 59 #include <sys/syslog.h> 60 #include <sys/mount.h> 61 #include <sys/signalvar.h> 62 #include <sys/vnode.h> 63 #include <sys/malloc.h> 64 65 #include <miscfs/procfs/procfs.h> 66 67 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 68 69 void procfs_init __P((void)); 70 void procfs_reinit __P((void)); 71 void procfs_done __P((void)); 72 int procfs_mount __P((struct mount *, const char *, void *, 73 struct nameidata *, struct proc *)); 74 int procfs_start __P((struct mount *, int, struct proc *)); 75 int procfs_unmount __P((struct mount *, int, struct proc *)); 76 int procfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 77 struct proc *)); 78 int procfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 79 int procfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 80 int procfs_vget __P((struct mount *, ino_t, struct vnode **)); 81 int procfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 82 int procfs_checkexp __P((struct mount *, struct mbuf *, int *, 83 struct ucred **)); 84 int procfs_vptofh __P((struct vnode *, struct fid *)); 85 int procfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 86 struct proc *)); 87 /* 88 * VFS Operations. 89 * 90 * mount system call 91 */ 92 /* ARGSUSED */ 93 int 94 procfs_mount(mp, path, data, ndp, p) 95 struct mount *mp; 96 const char *path; 97 void *data; 98 struct nameidata *ndp; 99 struct proc *p; 100 { 101 size_t size; 102 struct procfsmount *pmnt; 103 struct procfs_args args; 104 int error; 105 106 if (UIO_MX & (UIO_MX-1)) { 107 log(LOG_ERR, "procfs: invalid directory entry size"); 108 return (EINVAL); 109 } 110 111 if (mp->mnt_flag & MNT_UPDATE) 112 return (EOPNOTSUPP); 113 114 if (data != NULL) { 115 error = copyin(data, &args, sizeof args); 116 if (error != 0) 117 return error; 118 119 if (args.version != PROCFS_ARGSVERSION) 120 return EINVAL; 121 } else 122 args.flags = 0; 123 124 mp->mnt_flag |= MNT_LOCAL; 125 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 126 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 127 128 mp->mnt_data = (qaddr_t)pmnt; 129 vfs_getnewfsid(mp); 130 131 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN, &size); 132 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 133 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 134 memcpy(mp->mnt_stat.f_mntfromname, "procfs", sizeof("procfs")); 135 136 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 137 pmnt->pmnt_flags = args.flags; 138 139 return (0); 140 } 141 142 /* 143 * unmount system call 144 */ 145 int 146 procfs_unmount(mp, mntflags, p) 147 struct mount *mp; 148 int mntflags; 149 struct proc *p; 150 { 151 int error; 152 int flags = 0; 153 154 if (mntflags & MNT_FORCE) 155 flags |= FORCECLOSE; 156 157 if ((error = vflush(mp, 0, flags)) != 0) 158 return (error); 159 160 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 161 162 free(mp->mnt_data, M_UFSMNT); 163 mp->mnt_data = 0; 164 165 return (0); 166 } 167 168 int 169 procfs_root(mp, vpp) 170 struct mount *mp; 171 struct vnode **vpp; 172 { 173 174 return (procfs_allocvp(mp, vpp, 0, Proot)); 175 } 176 177 /* ARGSUSED */ 178 int 179 procfs_start(mp, flags, p) 180 struct mount *mp; 181 int flags; 182 struct proc *p; 183 { 184 185 return (0); 186 } 187 188 /* 189 * Get file system statistics. 190 */ 191 int 192 procfs_statfs(mp, sbp, p) 193 struct mount *mp; 194 struct statfs *sbp; 195 struct proc *p; 196 { 197 198 sbp->f_bsize = PAGE_SIZE; 199 sbp->f_iosize = PAGE_SIZE; 200 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 201 sbp->f_bfree = 0; 202 sbp->f_bavail = 0; 203 sbp->f_files = maxproc; /* approx */ 204 sbp->f_ffree = maxproc - nprocs; /* approx */ 205 #ifdef COMPAT_09 206 sbp->f_type = 10; 207 #else 208 sbp->f_type = 0; 209 #endif 210 if (sbp != &mp->mnt_stat) { 211 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 212 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 213 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 214 } 215 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 216 return (0); 217 } 218 219 /*ARGSUSED*/ 220 int 221 procfs_quotactl(mp, cmds, uid, arg, p) 222 struct mount *mp; 223 int cmds; 224 uid_t uid; 225 caddr_t arg; 226 struct proc *p; 227 { 228 229 return (EOPNOTSUPP); 230 } 231 232 /*ARGSUSED*/ 233 int 234 procfs_sync(mp, waitfor, uc, p) 235 struct mount *mp; 236 int waitfor; 237 struct ucred *uc; 238 struct proc *p; 239 { 240 241 return (0); 242 } 243 244 /*ARGSUSED*/ 245 int 246 procfs_vget(mp, ino, vpp) 247 struct mount *mp; 248 ino_t ino; 249 struct vnode **vpp; 250 { 251 252 return (EOPNOTSUPP); 253 } 254 255 /*ARGSUSED*/ 256 int 257 procfs_fhtovp(mp, fhp, vpp) 258 struct mount *mp; 259 struct fid *fhp; 260 struct vnode **vpp; 261 { 262 263 return (EINVAL); 264 } 265 266 /*ARGSUSED*/ 267 int 268 procfs_checkexp(mp, mb, what, anon) 269 struct mount *mp; 270 struct mbuf *mb; 271 int *what; 272 struct ucred **anon; 273 { 274 275 return (EINVAL); 276 } 277 278 /*ARGSUSED*/ 279 int 280 procfs_vptofh(vp, fhp) 281 struct vnode *vp; 282 struct fid *fhp; 283 { 284 285 return (EINVAL); 286 } 287 288 void 289 procfs_init() 290 { 291 procfs_hashinit(); 292 } 293 294 void 295 procfs_reinit() 296 { 297 procfs_hashreinit(); 298 } 299 300 void 301 procfs_done() 302 { 303 procfs_hashdone(); 304 } 305 306 int 307 procfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 308 int *name; 309 u_int namelen; 310 void *oldp; 311 size_t *oldlenp; 312 void *newp; 313 size_t newlen; 314 struct proc *p; 315 { 316 return (EOPNOTSUPP); 317 } 318 319 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 320 321 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 322 &procfs_vnodeop_opv_desc, 323 NULL, 324 }; 325 326 struct vfsops procfs_vfsops = { 327 MOUNT_PROCFS, 328 procfs_mount, 329 procfs_start, 330 procfs_unmount, 331 procfs_root, 332 procfs_quotactl, 333 procfs_statfs, 334 procfs_sync, 335 procfs_vget, 336 procfs_fhtovp, 337 procfs_vptofh, 338 procfs_init, 339 procfs_reinit, 340 procfs_done, 341 procfs_sysctl, 342 NULL, /* vfs_mountroot */ 343 procfs_checkexp, 344 procfs_vnodeopv_descs, 345 }; 346