| 1 | /* |
| 2 | * Copyright (c) 1989 The Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | * |
| 33 | * @(#)dead_vnops.c 7.13 (Berkeley) 4/15/91 |
| 34 | */ |
| 35 | |
| 36 | #include "param.h" |
| 37 | #include "systm.h" |
| 38 | #include "time.h" |
| 39 | #include "vnode.h" |
| 40 | #include "errno.h" |
| 41 | #include "namei.h" |
| 42 | #include "buf.h" |
| 43 | |
| 44 | /* |
| 45 | * Prototypes for dead operations on vnodes. |
| 46 | */ |
| 47 | int dead_badop(), |
| 48 | dead_ebadf(); |
| 49 | int dead_lookup __P(( |
| 50 | struct vnode *vp, |
| 51 | struct nameidata *ndp, |
| 52 | struct proc *p)); |
| 53 | #define dead_create ((int (*) __P(( \ |
| 54 | struct nameidata *ndp, \ |
| 55 | struct vattr *vap, \ |
| 56 | struct proc *p))) dead_badop) |
| 57 | #define dead_mknod ((int (*) __P(( \ |
| 58 | struct nameidata *ndp, \ |
| 59 | struct vattr *vap, \ |
| 60 | struct ucred *cred, \ |
| 61 | struct proc *p))) dead_badop) |
| 62 | int dead_open __P(( |
| 63 | struct vnode *vp, |
| 64 | int mode, |
| 65 | struct ucred *cred, |
| 66 | struct proc *p)); |
| 67 | #define dead_close ((int (*) __P(( \ |
| 68 | struct vnode *vp, \ |
| 69 | int fflag, \ |
| 70 | struct ucred *cred, \ |
| 71 | struct proc *p))) nullop) |
| 72 | #define dead_access ((int (*) __P(( \ |
| 73 | struct vnode *vp, \ |
| 74 | int mode, \ |
| 75 | struct ucred *cred, \ |
| 76 | struct proc *p))) dead_ebadf) |
| 77 | #define dead_getattr ((int (*) __P(( \ |
| 78 | struct vnode *vp, \ |
| 79 | struct vattr *vap, \ |
| 80 | struct ucred *cred, \ |
| 81 | struct proc *p))) dead_ebadf) |
| 82 | #define dead_setattr ((int (*) __P(( \ |
| 83 | struct vnode *vp, \ |
| 84 | struct vattr *vap, \ |
| 85 | struct ucred *cred, \ |
| 86 | struct proc *p))) dead_ebadf) |
| 87 | int dead_read __P(( |
| 88 | struct vnode *vp, |
| 89 | struct uio *uio, |
| 90 | int ioflag, |
| 91 | struct ucred *cred)); |
| 92 | int dead_write __P(( |
| 93 | struct vnode *vp, |
| 94 | struct uio *uio, |
| 95 | int ioflag, |
| 96 | struct ucred *cred)); |
| 97 | int dead_ioctl __P(( |
| 98 | struct vnode *vp, |
| 99 | int command, |
| 100 | caddr_t data, |
| 101 | int fflag, |
| 102 | struct ucred *cred, |
| 103 | struct proc *p)); |
| 104 | int dead_select __P(( |
| 105 | struct vnode *vp, |
| 106 | int which, |
| 107 | int fflags, |
| 108 | struct ucred *cred, |
| 109 | struct proc *p)); |
| 110 | #define dead_mmap ((int (*) __P(( \ |
| 111 | struct vnode *vp, \ |
| 112 | int fflags, \ |
| 113 | struct ucred *cred, \ |
| 114 | struct proc *p))) dead_badop) |
| 115 | #define dead_fsync ((int (*) __P(( \ |
| 116 | struct vnode *vp, \ |
| 117 | int fflags, \ |
| 118 | struct ucred *cred, \ |
| 119 | int waitfor, \ |
| 120 | struct proc *p))) nullop) |
| 121 | #define dead_seek ((int (*) __P(( \ |
| 122 | struct vnode *vp, \ |
| 123 | off_t oldoff, \ |
| 124 | off_t newoff, \ |
| 125 | struct ucred *cred))) nullop) |
| 126 | #define dead_remove ((int (*) __P(( \ |
| 127 | struct nameidata *ndp, \ |
| 128 | struct proc *p))) dead_badop) |
| 129 | #define dead_link ((int (*) __P(( \ |
| 130 | struct vnode *vp, \ |
| 131 | struct nameidata *ndp, \ |
| 132 | struct proc *p))) dead_badop) |
| 133 | #define dead_rename ((int (*) __P(( \ |
| 134 | struct nameidata *fndp, \ |
| 135 | struct nameidata *tdnp, \ |
| 136 | struct proc *p))) dead_badop) |
| 137 | #define dead_mkdir ((int (*) __P(( \ |
| 138 | struct nameidata *ndp, \ |
| 139 | struct vattr *vap, \ |
| 140 | struct proc *p))) dead_badop) |
| 141 | #define dead_rmdir ((int (*) __P(( \ |
| 142 | struct nameidata *ndp, \ |
| 143 | struct proc *p))) dead_badop) |
| 144 | #define dead_symlink ((int (*) __P(( \ |
| 145 | struct nameidata *ndp, \ |
| 146 | struct vattr *vap, \ |
| 147 | char *target, \ |
| 148 | struct proc *p))) dead_badop) |
| 149 | #define dead_readdir ((int (*) __P(( \ |
| 150 | struct vnode *vp, \ |
| 151 | struct uio *uio, \ |
| 152 | struct ucred *cred, \ |
| 153 | int *eofflagp))) dead_ebadf) |
| 154 | #define dead_readlink ((int (*) __P(( \ |
| 155 | struct vnode *vp, \ |
| 156 | struct uio *uio, \ |
| 157 | struct ucred *cred))) dead_ebadf) |
| 158 | #define dead_abortop ((int (*) __P(( \ |
| 159 | struct nameidata *ndp))) dead_badop) |
| 160 | #define dead_inactive ((int (*) __P(( \ |
| 161 | struct vnode *vp, \ |
| 162 | struct proc *p))) nullop) |
| 163 | #define dead_reclaim ((int (*) __P(( \ |
| 164 | struct vnode *vp))) nullop) |
| 165 | int dead_lock __P(( |
| 166 | struct vnode *vp)); |
| 167 | #define dead_unlock ((int (*) __P(( \ |
| 168 | struct vnode *vp))) nullop) |
| 169 | int dead_bmap __P(( |
| 170 | struct vnode *vp, |
| 171 | daddr_t bn, |
| 172 | struct vnode **vpp, |
| 173 | daddr_t *bnp)); |
| 174 | int dead_strategy __P(( |
| 175 | struct buf *bp)); |
| 176 | int dead_print __P(( |
| 177 | struct vnode *vp)); |
| 178 | #define dead_islocked ((int (*) __P(( \ |
| 179 | struct vnode *vp))) nullop) |
| 180 | #define dead_advlock ((int (*) __P(( \ |
| 181 | struct vnode *vp, \ |
| 182 | caddr_t id, \ |
| 183 | int op, \ |
| 184 | struct flock *fl, \ |
| 185 | int flags))) dead_ebadf) |
| 186 | |
| 187 | struct vnodeops dead_vnodeops = { |
| 188 | dead_lookup, /* lookup */ |
| 189 | dead_create, /* create */ |
| 190 | dead_mknod, /* mknod */ |
| 191 | dead_open, /* open */ |
| 192 | dead_close, /* close */ |
| 193 | dead_access, /* access */ |
| 194 | dead_getattr, /* getattr */ |
| 195 | dead_setattr, /* setattr */ |
| 196 | dead_read, /* read */ |
| 197 | dead_write, /* write */ |
| 198 | dead_ioctl, /* ioctl */ |
| 199 | dead_select, /* select */ |
| 200 | dead_mmap, /* mmap */ |
| 201 | dead_fsync, /* fsync */ |
| 202 | dead_seek, /* seek */ |
| 203 | dead_remove, /* remove */ |
| 204 | dead_link, /* link */ |
| 205 | dead_rename, /* rename */ |
| 206 | dead_mkdir, /* mkdir */ |
| 207 | dead_rmdir, /* rmdir */ |
| 208 | dead_symlink, /* symlink */ |
| 209 | dead_readdir, /* readdir */ |
| 210 | dead_readlink, /* readlink */ |
| 211 | dead_abortop, /* abortop */ |
| 212 | dead_inactive, /* inactive */ |
| 213 | dead_reclaim, /* reclaim */ |
| 214 | dead_lock, /* lock */ |
| 215 | dead_unlock, /* unlock */ |
| 216 | dead_bmap, /* bmap */ |
| 217 | dead_strategy, /* strategy */ |
| 218 | dead_print, /* print */ |
| 219 | dead_islocked, /* islocked */ |
| 220 | dead_advlock, /* advlock */ |
| 221 | }; |
| 222 | |
| 223 | /* |
| 224 | * Trivial lookup routine that always fails. |
| 225 | */ |
| 226 | /* ARGSUSED */ |
| 227 | dead_lookup(vp, ndp, p) |
| 228 | struct vnode *vp; |
| 229 | struct nameidata *ndp; |
| 230 | struct proc *p; |
| 231 | { |
| 232 | |
| 233 | ndp->ni_dvp = vp; |
| 234 | ndp->ni_vp = NULL; |
| 235 | return (ENOTDIR); |
| 236 | } |
| 237 | |
| 238 | /* |
| 239 | * Open always fails as if device did not exist. |
| 240 | */ |
| 241 | /* ARGSUSED */ |
| 242 | dead_open(vp, mode, cred, p) |
| 243 | struct vnode *vp; |
| 244 | int mode; |
| 245 | struct ucred *cred; |
| 246 | struct proc *p; |
| 247 | { |
| 248 | |
| 249 | return (ENXIO); |
| 250 | } |
| 251 | |
| 252 | /* |
| 253 | * Vnode op for read |
| 254 | */ |
| 255 | /* ARGSUSED */ |
| 256 | dead_read(vp, uio, ioflag, cred) |
| 257 | struct vnode *vp; |
| 258 | struct uio *uio; |
| 259 | int ioflag; |
| 260 | struct ucred *cred; |
| 261 | { |
| 262 | |
| 263 | if (chkvnlock(vp)) |
| 264 | panic("dead_read: lock"); |
| 265 | /* |
| 266 | * Return EOF for character devices, EIO for others |
| 267 | */ |
| 268 | if (vp->v_type != VCHR) |
| 269 | return (EIO); |
| 270 | return (0); |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Vnode op for write |
| 275 | */ |
| 276 | /* ARGSUSED */ |
| 277 | dead_write(vp, uio, ioflag, cred) |
| 278 | register struct vnode *vp; |
| 279 | struct uio *uio; |
| 280 | int ioflag; |
| 281 | struct ucred *cred; |
| 282 | { |
| 283 | |
| 284 | if (chkvnlock(vp)) |
| 285 | panic("dead_write: lock"); |
| 286 | return (EIO); |
| 287 | } |
| 288 | |
| 289 | /* |
| 290 | * Device ioctl operation. |
| 291 | */ |
| 292 | /* ARGSUSED */ |
| 293 | dead_ioctl(vp, com, data, fflag, cred, p) |
| 294 | struct vnode *vp; |
| 295 | register int com; |
| 296 | caddr_t data; |
| 297 | int fflag; |
| 298 | struct ucred *cred; |
| 299 | struct proc *p; |
| 300 | { |
| 301 | |
| 302 | if (!chkvnlock(vp)) |
| 303 | return (EBADF); |
| 304 | return (VOP_IOCTL(vp, com, data, fflag, cred, p)); |
| 305 | } |
| 306 | |
| 307 | /* ARGSUSED */ |
| 308 | dead_select(vp, which, fflags, cred, p) |
| 309 | struct vnode *vp; |
| 310 | int which, fflags; |
| 311 | struct ucred *cred; |
| 312 | struct proc *p; |
| 313 | { |
| 314 | |
| 315 | /* |
| 316 | * Let the user find out that the descriptor is gone. |
| 317 | */ |
| 318 | return (1); |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * Just call the device strategy routine |
| 323 | */ |
| 324 | dead_strategy(bp) |
| 325 | register struct buf *bp; |
| 326 | { |
| 327 | |
| 328 | if (bp->b_vp == NULL || !chkvnlock(bp->b_vp)) { |
| 329 | bp->b_flags |= B_ERROR; |
| 330 | biodone(bp); |
| 331 | return (EIO); |
| 332 | } |
| 333 | return (VOP_STRATEGY(bp)); |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * Wait until the vnode has finished changing state. |
| 338 | */ |
| 339 | dead_lock(vp) |
| 340 | struct vnode *vp; |
| 341 | { |
| 342 | |
| 343 | if (!chkvnlock(vp)) |
| 344 | return (0); |
| 345 | return (VOP_LOCK(vp)); |
| 346 | } |
| 347 | |
| 348 | /* |
| 349 | * Wait until the vnode has finished changing state. |
| 350 | */ |
| 351 | dead_bmap(vp, bn, vpp, bnp) |
| 352 | struct vnode *vp; |
| 353 | daddr_t bn; |
| 354 | struct vnode **vpp; |
| 355 | daddr_t *bnp; |
| 356 | { |
| 357 | |
| 358 | if (!chkvnlock(vp)) |
| 359 | return (EIO); |
| 360 | return (VOP_BMAP(vp, bn, vpp, bnp)); |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | * Print out the contents of a dead vnode. |
| 365 | */ |
| 366 | /* ARGSUSED */ |
| 367 | dead_print(vp) |
| 368 | struct vnode *vp; |
| 369 | { |
| 370 | |
| 371 | printf("tag VT_NON, dead vnode\n"); |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * Empty vnode failed operation |
| 376 | */ |
| 377 | dead_ebadf() |
| 378 | { |
| 379 | |
| 380 | return (EBADF); |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * Empty vnode bad operation |
| 385 | */ |
| 386 | dead_badop() |
| 387 | { |
| 388 | |
| 389 | panic("dead_badop called"); |
| 390 | /* NOTREACHED */ |
| 391 | } |
| 392 | |
| 393 | /* |
| 394 | * Empty vnode null operation |
| 395 | */ |
| 396 | dead_nullop() |
| 397 | { |
| 398 | |
| 399 | return (0); |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * We have to wait during times when the vnode is |
| 404 | * in a state of change. |
| 405 | */ |
| 406 | chkvnlock(vp) |
| 407 | register struct vnode *vp; |
| 408 | { |
| 409 | int locked = 0; |
| 410 | |
| 411 | while (vp->v_flag & VXLOCK) { |
| 412 | vp->v_flag |= VXWANT; |
| 413 | sleep((caddr_t)vp, PINOD); |
| 414 | locked = 1; |
| 415 | } |
| 416 | return (locked); |
| 417 | } |