1 /* $OpenBSD: vfs_vops.c,v 1.35 2022/06/26 05:20:42 visa Exp $ */ 2 /* 3 * Copyright (c) 2010 Thordur I. Bjornsson <thib@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 * 17 * Copyright (c) 1992, 1993 18 * The Regents of the University of California. All rights reserved. 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 1. Redistributions of source code must retain the above copyright 24 * notice, this list of conditions and the following disclaimer. 25 * 2. Redistributions in binary form must reproduce the above copyright 26 * notice, this list of conditions and the following disclaimer in the 27 * documentation and/or other materials provided with the distribution. 28 * 3. Neither the name of the University nor the names of its contributors 29 * may be used to endorse or promote products derived from this software 30 * without specific prior written permission. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS AS IS'' AND 33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 42 * SUCH DAMAGE. 43 */ 44 45 #include <sys/param.h> 46 #include <sys/vnode.h> 47 #include <sys/unistd.h> 48 #include <sys/systm.h> 49 50 #ifdef VFSLCKDEBUG 51 #define ASSERT_VP_ISLOCKED(vp) do { \ 52 if (((vp)->v_flag & VLOCKSWORK) && !VOP_ISLOCKED(vp)) { \ 53 VOP_PRINT(vp); \ 54 panic("vp not locked"); \ 55 } \ 56 } while (0) 57 #else 58 #define ASSERT_VP_ISLOCKED(vp) /* nothing */ 59 #endif 60 61 int 62 VOP_ISLOCKED(struct vnode *vp) 63 { 64 struct vop_islocked_args a; 65 a.a_vp = vp; 66 67 if (vp->v_op->vop_islocked == NULL) 68 return (EOPNOTSUPP); 69 70 return ((vp->v_op->vop_islocked)(&a)); 71 } 72 73 int 74 VOP_LOOKUP(struct vnode *dvp, struct vnode **vpp, 75 struct componentname *cnp) 76 { 77 struct vop_lookup_args a; 78 a.a_dvp = dvp; 79 a.a_vpp = vpp; 80 a.a_cnp = cnp; 81 82 if (dvp->v_op->vop_lookup == NULL) 83 return (EOPNOTSUPP); 84 85 return ((dvp->v_op->vop_lookup)(&a)); 86 } 87 88 int 89 VOP_CREATE(struct vnode *dvp, struct vnode **vpp, 90 struct componentname *cnp, struct vattr *vap) 91 { 92 struct vop_create_args a; 93 a.a_dvp = dvp; 94 a.a_vpp = vpp; 95 a.a_cnp = cnp; 96 a.a_vap = vap; 97 98 ASSERT_VP_ISLOCKED(dvp); 99 100 if (dvp->v_op->vop_create == NULL) 101 return (EOPNOTSUPP); 102 103 return ((dvp->v_op->vop_create)(&a)); 104 } 105 106 int 107 VOP_MKNOD(struct vnode *dvp, struct vnode **vpp, 108 struct componentname *cnp, struct vattr *vap) 109 { 110 struct vop_mknod_args a; 111 a.a_dvp = dvp; 112 a.a_vpp = vpp; 113 a.a_cnp = cnp; 114 a.a_vap = vap; 115 116 ASSERT_VP_ISLOCKED(dvp); 117 118 if (dvp->v_op->vop_mknod == NULL) 119 return (EOPNOTSUPP); 120 121 return ((dvp->v_op->vop_mknod)(&a)); 122 } 123 124 int 125 VOP_OPEN(struct vnode *vp, int mode, struct ucred *cred, struct proc *p) 126 { 127 struct vop_open_args a; 128 a.a_vp = vp; 129 a.a_mode = mode; 130 a.a_cred = cred; 131 a.a_p = p; 132 133 KASSERT(p == curproc); 134 135 if (vp->v_op->vop_open == NULL) 136 return (EOPNOTSUPP); 137 138 return ((vp->v_op->vop_open)(&a)); 139 } 140 141 int 142 VOP_CLOSE(struct vnode *vp, int fflag, struct ucred *cred, struct proc *p) 143 { 144 struct vop_close_args a; 145 a.a_vp = vp; 146 a.a_fflag = fflag; 147 a.a_cred = cred; 148 a.a_p = p; 149 150 KASSERT(p == NULL || p == curproc); 151 ASSERT_VP_ISLOCKED(vp); 152 153 if (vp->v_op->vop_close == NULL) 154 return (EOPNOTSUPP); 155 156 return ((vp->v_op->vop_close)(&a)); 157 } 158 159 int 160 VOP_ACCESS(struct vnode *vp, int mode, struct ucred *cred, struct proc *p) 161 { 162 struct vop_access_args a; 163 a.a_vp = vp; 164 a.a_mode = mode; 165 a.a_cred = cred; 166 a.a_p = p; 167 168 KASSERT(p == curproc); 169 ASSERT_VP_ISLOCKED(vp); 170 171 if (vp->v_op->vop_access == NULL) 172 return (EOPNOTSUPP); 173 174 return ((vp->v_op->vop_access)(&a)); 175 } 176 177 int 178 VOP_GETATTR(struct vnode *vp, struct vattr *vap, struct ucred *cred, 179 struct proc *p) 180 { 181 struct vop_getattr_args a; 182 a.a_vp = vp; 183 a.a_vap = vap; 184 a.a_cred = cred; 185 a.a_p = p; 186 187 KASSERT(p == curproc); 188 if (vp->v_op->vop_getattr == NULL) 189 return (EOPNOTSUPP); 190 191 return ((vp->v_op->vop_getattr)(&a)); 192 } 193 194 int 195 VOP_SETATTR(struct vnode *vp, struct vattr *vap, struct ucred *cred, 196 struct proc *p) 197 { 198 struct vop_setattr_args a; 199 a.a_vp = vp; 200 a.a_vap = vap; 201 a.a_cred = cred; 202 a.a_p = p; 203 204 KASSERT(p == curproc); 205 ASSERT_VP_ISLOCKED(vp); 206 207 if (vp->v_op->vop_setattr == NULL) 208 return (EOPNOTSUPP); 209 210 return ((vp->v_op->vop_setattr)(&a)); 211 } 212 213 int 214 VOP_READ(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred) 215 { 216 struct vop_read_args a; 217 a.a_vp = vp; 218 a.a_uio = uio; 219 a.a_ioflag = ioflag; 220 a.a_cred = cred; 221 222 ASSERT_VP_ISLOCKED(vp); 223 224 if (vp->v_op->vop_read == NULL) 225 return (EOPNOTSUPP); 226 227 return ((vp->v_op->vop_read)(&a)); 228 } 229 230 int 231 VOP_WRITE(struct vnode *vp, struct uio *uio, int ioflag, 232 struct ucred *cred) 233 { 234 struct vop_write_args a; 235 a.a_vp = vp; 236 a.a_uio = uio; 237 a.a_ioflag = ioflag; 238 a.a_cred = cred; 239 240 ASSERT_VP_ISLOCKED(vp); 241 242 if (vp->v_op->vop_write == NULL) 243 return (EOPNOTSUPP); 244 245 return ((vp->v_op->vop_write)(&a)); 246 } 247 248 int 249 VOP_IOCTL(struct vnode *vp, u_long command, void *data, int fflag, 250 struct ucred *cred, struct proc *p) 251 { 252 struct vop_ioctl_args a; 253 a.a_vp = vp; 254 a.a_command = command; 255 a.a_data = data; 256 a.a_fflag = fflag; 257 a.a_cred = cred; 258 a.a_p = p; 259 260 KASSERT(p == curproc); 261 if (vp->v_op->vop_ioctl == NULL) 262 return (EOPNOTSUPP); 263 264 return ((vp->v_op->vop_ioctl)(&a)); 265 } 266 267 int 268 VOP_KQFILTER(struct vnode *vp, int fflag, struct knote *kn) 269 { 270 struct vop_kqfilter_args a; 271 a.a_vp = vp; 272 a.a_fflag = fflag; 273 a.a_kn = kn; 274 275 if (vp->v_op->vop_kqfilter == NULL) 276 return (EOPNOTSUPP); 277 278 return ((vp->v_op->vop_kqfilter)(&a)); 279 } 280 281 int 282 VOP_REVOKE(struct vnode *vp, int flags) 283 { 284 struct vop_revoke_args a; 285 a.a_vp = vp; 286 a.a_flags = flags; 287 288 if (vp->v_op->vop_revoke == NULL) 289 return (EOPNOTSUPP); 290 291 return ((vp->v_op->vop_revoke)(&a)); 292 } 293 294 int 295 VOP_FSYNC(struct vnode *vp, struct ucred *cred, int waitfor, 296 struct proc *p) 297 { 298 int r, s; 299 struct vop_fsync_args a; 300 a.a_vp = vp; 301 a.a_cred = cred; 302 a.a_waitfor = waitfor; 303 a.a_p = p; 304 305 KASSERT(p == curproc); 306 ASSERT_VP_ISLOCKED(vp); 307 308 if (vp->v_op->vop_fsync == NULL) 309 return (EOPNOTSUPP); 310 311 r = (vp->v_op->vop_fsync)(&a); 312 s = splbio(); 313 if (r == 0 && vp->v_bioflag & VBIOERROR) 314 r = EIO; 315 splx(s); 316 return r; 317 } 318 319 int 320 VOP_REMOVE(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 321 { 322 struct vop_remove_args a; 323 a.a_dvp = dvp; 324 a.a_vp = vp; 325 a.a_cnp = cnp; 326 327 ASSERT_VP_ISLOCKED(dvp); 328 ASSERT_VP_ISLOCKED(vp); 329 330 if (dvp->v_op->vop_remove == NULL) 331 return (EOPNOTSUPP); 332 333 return ((dvp->v_op->vop_remove)(&a)); 334 } 335 336 int 337 VOP_LINK(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 338 { 339 struct vop_link_args a; 340 a.a_dvp = dvp; 341 a.a_vp = vp; 342 a.a_cnp = cnp; 343 344 ASSERT_VP_ISLOCKED(dvp); 345 346 if (dvp->v_op->vop_link == NULL) 347 return (EOPNOTSUPP); 348 349 return ((dvp->v_op->vop_link)(&a)); 350 } 351 352 int 353 VOP_RENAME(struct vnode *fdvp, struct vnode *fvp, 354 struct componentname *fcnp, struct vnode *tdvp, struct vnode *tvp, 355 struct componentname *tcnp) 356 { 357 struct vop_rename_args a; 358 a.a_fdvp = fdvp; 359 a.a_fvp = fvp; 360 a.a_fcnp = fcnp; 361 a.a_tdvp = tdvp; 362 a.a_tvp = tvp; 363 a.a_tcnp = tcnp; 364 365 ASSERT_VP_ISLOCKED(tdvp); 366 367 if (fdvp->v_op->vop_rename == NULL) 368 return (EOPNOTSUPP); 369 370 return ((fdvp->v_op->vop_rename)(&a)); 371 } 372 373 int 374 VOP_MKDIR(struct vnode *dvp, struct vnode **vpp, 375 struct componentname *cnp, struct vattr *vap) 376 { 377 struct vop_mkdir_args a; 378 a.a_dvp = dvp; 379 a.a_vpp = vpp; 380 a.a_cnp = cnp; 381 a.a_vap = vap; 382 383 ASSERT_VP_ISLOCKED(dvp); 384 385 if (dvp->v_op->vop_mkdir == NULL) 386 return (EOPNOTSUPP); 387 388 return ((dvp->v_op->vop_mkdir)(&a)); 389 } 390 391 int 392 VOP_RMDIR(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 393 { 394 struct vop_rmdir_args a; 395 a.a_dvp = dvp; 396 a.a_vp = vp; 397 a.a_cnp = cnp; 398 399 ASSERT_VP_ISLOCKED(dvp); 400 ASSERT_VP_ISLOCKED(vp); 401 402 KASSERT(dvp != vp); 403 404 if (dvp->v_op->vop_rmdir == NULL) 405 return (EOPNOTSUPP); 406 407 return ((dvp->v_op->vop_rmdir)(&a)); 408 } 409 410 int 411 VOP_SYMLINK(struct vnode *dvp, struct vnode **vpp, 412 struct componentname *cnp, struct vattr *vap, char *target) 413 { 414 struct vop_symlink_args a; 415 a.a_dvp = dvp; 416 a.a_vpp = vpp; 417 a.a_cnp = cnp; 418 a.a_vap = vap; 419 a.a_target = target; 420 421 ASSERT_VP_ISLOCKED(dvp); 422 423 if (dvp->v_op->vop_symlink == NULL) 424 return (EOPNOTSUPP); 425 426 return ((dvp->v_op->vop_symlink)(&a)); 427 } 428 429 int 430 VOP_READDIR(struct vnode *vp, struct uio *uio, struct ucred *cred, 431 int *eofflag) 432 { 433 struct vop_readdir_args a; 434 a.a_vp = vp; 435 a.a_uio = uio; 436 a.a_cred = cred; 437 a.a_eofflag = eofflag; 438 439 ASSERT_VP_ISLOCKED(vp); 440 441 if (vp->v_op->vop_readdir == NULL) 442 return (EOPNOTSUPP); 443 444 return ((vp->v_op->vop_readdir)(&a)); 445 } 446 447 int 448 VOP_READLINK(struct vnode *vp, struct uio *uio, struct ucred *cred) 449 { 450 struct vop_readlink_args a; 451 a.a_vp = vp; 452 a.a_uio = uio; 453 a.a_cred = cred; 454 455 ASSERT_VP_ISLOCKED(vp); 456 457 if (vp->v_op->vop_readlink == NULL) 458 return (EOPNOTSUPP); 459 460 return ((vp->v_op->vop_readlink)(&a)); 461 } 462 463 int 464 VOP_ABORTOP(struct vnode *dvp, struct componentname *cnp) 465 { 466 struct vop_abortop_args a; 467 a.a_dvp = dvp; 468 a.a_cnp = cnp; 469 470 if (dvp->v_op->vop_abortop == NULL) 471 return (EOPNOTSUPP); 472 473 return ((dvp->v_op->vop_abortop)(&a)); 474 } 475 476 int 477 VOP_INACTIVE(struct vnode *vp, struct proc *p) 478 { 479 struct vop_inactive_args a; 480 a.a_vp = vp; 481 a.a_p = p; 482 483 KASSERT(p == curproc); 484 ASSERT_VP_ISLOCKED(vp); 485 486 if (vp->v_op->vop_inactive == NULL) 487 return (EOPNOTSUPP); 488 489 return ((vp->v_op->vop_inactive)(&a)); 490 } 491 492 int 493 VOP_RECLAIM(struct vnode *vp, struct proc *p) 494 { 495 struct vop_reclaim_args a; 496 a.a_vp = vp; 497 a.a_p = p; 498 499 KASSERT(p == curproc); 500 if (vp->v_op->vop_reclaim == NULL) 501 return (EOPNOTSUPP); 502 503 return ((vp->v_op->vop_reclaim)(&a)); 504 } 505 506 int 507 VOP_LOCK(struct vnode *vp, int flags) 508 { 509 struct vop_lock_args a; 510 a.a_vp = vp; 511 a.a_flags = flags; 512 513 MUTEX_ASSERT_UNLOCKED(&vnode_mtx); 514 515 if (vp->v_op->vop_lock == NULL) 516 return (EOPNOTSUPP); 517 518 return ((vp->v_op->vop_lock)(&a)); 519 } 520 521 int 522 VOP_UNLOCK(struct vnode *vp) 523 { 524 struct vop_unlock_args a; 525 a.a_vp = vp; 526 527 if (vp->v_op->vop_unlock == NULL) 528 return (EOPNOTSUPP); 529 530 return ((vp->v_op->vop_unlock)(&a)); 531 } 532 533 int 534 VOP_BMAP(struct vnode *vp, daddr_t bn, struct vnode **vpp, 535 daddr_t *bnp, int *runp) 536 { 537 struct vop_bmap_args a; 538 a.a_vp = vp; 539 a.a_bn = bn; 540 a.a_vpp = vpp; 541 a.a_bnp = bnp; 542 a.a_runp = runp; 543 544 ASSERT_VP_ISLOCKED(vp); 545 546 if (vp->v_op->vop_bmap == NULL) 547 return (EOPNOTSUPP); 548 549 return ((vp->v_op->vop_bmap)(&a)); 550 } 551 552 int 553 VOP_PRINT(struct vnode *vp) 554 { 555 struct vop_print_args a; 556 a.a_vp = vp; 557 558 if (vp->v_op->vop_print == NULL) 559 return (EOPNOTSUPP); 560 561 return ((vp->v_op->vop_print)(&a)); 562 } 563 564 int 565 VOP_PATHCONF(struct vnode *vp, int name, register_t *retval) 566 { 567 struct vop_pathconf_args a; 568 569 /* 570 * Handle names that are constant across filesystem 571 */ 572 switch (name) { 573 case _PC_PATH_MAX: 574 *retval = PATH_MAX; 575 return (0); 576 case _PC_PIPE_BUF: 577 *retval = PIPE_BUF; 578 return (0); 579 case _PC_ASYNC_IO: 580 case _PC_PRIO_IO: 581 case _PC_SYNC_IO: 582 *retval = 0; 583 return (0); 584 585 } 586 587 a.a_vp = vp; 588 a.a_name = name; 589 a.a_retval = retval; 590 591 ASSERT_VP_ISLOCKED(vp); 592 593 if (vp->v_op->vop_pathconf == NULL) 594 return (EOPNOTSUPP); 595 596 return ((vp->v_op->vop_pathconf)(&a)); 597 } 598 599 int 600 VOP_ADVLOCK(struct vnode *vp, void *id, int op, struct flock *fl, int flags) 601 { 602 struct vop_advlock_args a; 603 a.a_vp = vp; 604 a.a_id = id; 605 a.a_op = op; 606 a.a_fl = fl; 607 a.a_flags = flags; 608 609 if (vp->v_op->vop_advlock == NULL) 610 return (EOPNOTSUPP); 611 612 return (vp->v_op->vop_advlock)(&a); 613 } 614 615 int 616 VOP_STRATEGY(struct vnode *vp, struct buf *bp) 617 { 618 struct vop_strategy_args a; 619 a.a_vp = vp; 620 a.a_bp = bp; 621 622 if ((ISSET(bp->b_flags, B_BC)) && (!ISSET(bp->b_flags, B_DMA))) 623 panic("Non dma reachable buffer passed to VOP_STRATEGY"); 624 625 if (vp->v_op->vop_strategy == NULL) 626 return (EOPNOTSUPP); 627 628 return ((vp->v_op->vop_strategy)(&a)); 629 } 630 631 int 632 VOP_BWRITE(struct buf *bp) 633 { 634 struct vop_bwrite_args a; 635 a.a_bp = bp; 636 637 if (bp->b_vp->v_op->vop_bwrite == NULL) 638 return (EOPNOTSUPP); 639 640 return ((bp->b_vp->v_op->vop_bwrite)(&a)); 641 } 642