1 /* $NetBSD: procfs_vfsops.c,v 1.44 2003/01/03 13:21:18 christos 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 1.44 2003/01/03 13:21:18 christos 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_GETARGS) { 112 pmnt = VFSTOPROC(mp); 113 if (pmnt == NULL) 114 return EIO; 115 args.version = PROCFS_ARGSVERSION; 116 args.flags = pmnt->pmnt_flags; 117 return copyout(&args, data, sizeof(args)); 118 } 119 120 if (mp->mnt_flag & MNT_UPDATE) 121 return (EOPNOTSUPP); 122 123 if (data != NULL) { 124 error = copyin(data, &args, sizeof args); 125 if (error != 0) 126 return error; 127 128 if (args.version != PROCFS_ARGSVERSION) 129 return EINVAL; 130 } else 131 args.flags = 0; 132 133 mp->mnt_flag |= MNT_LOCAL; 134 pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), 135 M_UFSMNT, M_WAITOK); /* XXX need new malloc type */ 136 137 mp->mnt_data = pmnt; 138 vfs_getnewfsid(mp); 139 140 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN, &size); 141 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 142 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 143 memcpy(mp->mnt_stat.f_mntfromname, "procfs", sizeof("procfs")); 144 145 pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); 146 pmnt->pmnt_flags = args.flags; 147 148 return (0); 149 } 150 151 /* 152 * unmount system call 153 */ 154 int 155 procfs_unmount(mp, mntflags, p) 156 struct mount *mp; 157 int mntflags; 158 struct proc *p; 159 { 160 int error; 161 int flags = 0; 162 163 if (mntflags & MNT_FORCE) 164 flags |= FORCECLOSE; 165 166 if ((error = vflush(mp, 0, flags)) != 0) 167 return (error); 168 169 exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook); 170 171 free(mp->mnt_data, M_UFSMNT); 172 mp->mnt_data = 0; 173 174 return (0); 175 } 176 177 int 178 procfs_root(mp, vpp) 179 struct mount *mp; 180 struct vnode **vpp; 181 { 182 183 return (procfs_allocvp(mp, vpp, 0, Proot, -1)); 184 } 185 186 /* ARGSUSED */ 187 int 188 procfs_start(mp, flags, p) 189 struct mount *mp; 190 int flags; 191 struct proc *p; 192 { 193 194 return (0); 195 } 196 197 /* 198 * Get file system statistics. 199 */ 200 int 201 procfs_statfs(mp, sbp, p) 202 struct mount *mp; 203 struct statfs *sbp; 204 struct proc *p; 205 { 206 207 sbp->f_bsize = PAGE_SIZE; 208 sbp->f_iosize = PAGE_SIZE; 209 sbp->f_blocks = 1; /* avoid divide by zero in some df's */ 210 sbp->f_bfree = 0; 211 sbp->f_bavail = 0; 212 sbp->f_files = maxproc; /* approx */ 213 sbp->f_ffree = maxproc - nprocs; /* approx */ 214 #ifdef COMPAT_09 215 sbp->f_type = 10; 216 #else 217 sbp->f_type = 0; 218 #endif 219 if (sbp != &mp->mnt_stat) { 220 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 221 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 222 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 223 } 224 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 225 return (0); 226 } 227 228 /*ARGSUSED*/ 229 int 230 procfs_quotactl(mp, cmds, uid, arg, p) 231 struct mount *mp; 232 int cmds; 233 uid_t uid; 234 caddr_t arg; 235 struct proc *p; 236 { 237 238 return (EOPNOTSUPP); 239 } 240 241 /*ARGSUSED*/ 242 int 243 procfs_sync(mp, waitfor, uc, p) 244 struct mount *mp; 245 int waitfor; 246 struct ucred *uc; 247 struct proc *p; 248 { 249 250 return (0); 251 } 252 253 /*ARGSUSED*/ 254 int 255 procfs_vget(mp, ino, vpp) 256 struct mount *mp; 257 ino_t ino; 258 struct vnode **vpp; 259 { 260 return (EOPNOTSUPP); 261 } 262 263 /*ARGSUSED*/ 264 int 265 procfs_fhtovp(mp, fhp, vpp) 266 struct mount *mp; 267 struct fid *fhp; 268 struct vnode **vpp; 269 { 270 271 return (EINVAL); 272 } 273 274 /*ARGSUSED*/ 275 int 276 procfs_checkexp(mp, mb, what, anon) 277 struct mount *mp; 278 struct mbuf *mb; 279 int *what; 280 struct ucred **anon; 281 { 282 283 return (EINVAL); 284 } 285 286 /*ARGSUSED*/ 287 int 288 procfs_vptofh(vp, fhp) 289 struct vnode *vp; 290 struct fid *fhp; 291 { 292 293 return (EINVAL); 294 } 295 296 void 297 procfs_init() 298 { 299 procfs_hashinit(); 300 } 301 302 void 303 procfs_reinit() 304 { 305 procfs_hashreinit(); 306 } 307 308 void 309 procfs_done() 310 { 311 procfs_hashdone(); 312 } 313 314 int 315 procfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 316 int *name; 317 u_int namelen; 318 void *oldp; 319 size_t *oldlenp; 320 void *newp; 321 size_t newlen; 322 struct proc *p; 323 { 324 return (EOPNOTSUPP); 325 } 326 327 extern const struct vnodeopv_desc procfs_vnodeop_opv_desc; 328 329 const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = { 330 &procfs_vnodeop_opv_desc, 331 NULL, 332 }; 333 334 struct vfsops procfs_vfsops = { 335 MOUNT_PROCFS, 336 procfs_mount, 337 procfs_start, 338 procfs_unmount, 339 procfs_root, 340 procfs_quotactl, 341 procfs_statfs, 342 procfs_sync, 343 procfs_vget, 344 procfs_fhtovp, 345 procfs_vptofh, 346 procfs_init, 347 procfs_reinit, 348 procfs_done, 349 procfs_sysctl, 350 NULL, /* vfs_mountroot */ 351 procfs_checkexp, 352 procfs_vnodeopv_descs, 353 }; 354