1 /* $OpenBSD: vfs_vops.c,v 1.28 2020/04/08 08:07:51 mpi 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 #include <sys/systm.h> /* for panic() */ 52 53 #define ASSERT_VP_ISLOCKED(vp) do { \ 54 if (((vp)->v_flag & VLOCKSWORK) && !VOP_ISLOCKED(vp)) { \ 55 VOP_PRINT(vp); \ 56 panic("vp not locked"); \ 57 } \ 58 } while (0) 59 #else 60 #define ASSERT_VP_ISLOCKED(vp) /* nothing */ 61 #endif 62 63 int 64 VOP_ISLOCKED(struct vnode *vp) 65 { 66 struct vop_islocked_args a; 67 a.a_vp = vp; 68 69 if (vp->v_op->vop_islocked == NULL) 70 return (EOPNOTSUPP); 71 72 return ((vp->v_op->vop_islocked)(&a)); 73 } 74 75 int 76 VOP_LOOKUP(struct vnode *dvp, struct vnode **vpp, 77 struct componentname *cnp) 78 { 79 int r; 80 struct vop_lookup_args a; 81 a.a_dvp = dvp; 82 a.a_vpp = vpp; 83 a.a_cnp = cnp; 84 85 if (dvp->v_op->vop_lookup == NULL) 86 return (EOPNOTSUPP); 87 88 dvp->v_inflight++; 89 r = (dvp->v_op->vop_lookup)(&a); 90 dvp->v_inflight--; 91 return r; 92 } 93 94 int 95 VOP_CREATE(struct vnode *dvp, struct vnode **vpp, 96 struct componentname *cnp, struct vattr *vap) 97 { 98 int r; 99 struct vop_create_args a; 100 a.a_dvp = dvp; 101 a.a_vpp = vpp; 102 a.a_cnp = cnp; 103 a.a_vap = vap; 104 105 ASSERT_VP_ISLOCKED(dvp); 106 107 if (dvp->v_op->vop_create == NULL) 108 return (EOPNOTSUPP); 109 110 dvp->v_inflight++; 111 r = (dvp->v_op->vop_create)(&a); 112 dvp->v_inflight--; 113 return r; 114 } 115 116 int 117 VOP_MKNOD(struct vnode *dvp, struct vnode **vpp, 118 struct componentname *cnp, struct vattr *vap) 119 { 120 int r; 121 struct vop_mknod_args a; 122 a.a_dvp = dvp; 123 a.a_vpp = vpp; 124 a.a_cnp = cnp; 125 a.a_vap = vap; 126 127 ASSERT_VP_ISLOCKED(dvp); 128 129 if (dvp->v_op->vop_mknod == NULL) 130 return (EOPNOTSUPP); 131 132 dvp->v_inflight++; 133 r = (dvp->v_op->vop_mknod)(&a); 134 dvp->v_inflight--; 135 return r; 136 } 137 138 int 139 VOP_OPEN(struct vnode *vp, int mode, struct ucred *cred, struct proc *p) 140 { 141 int r; 142 struct vop_open_args a; 143 a.a_vp = vp; 144 a.a_mode = mode; 145 a.a_cred = cred; 146 a.a_p = p; 147 148 if (vp->v_op->vop_open == NULL) 149 return (EOPNOTSUPP); 150 151 vp->v_inflight++; 152 r = (vp->v_op->vop_open)(&a); 153 vp->v_inflight--; 154 return r; 155 } 156 157 int 158 VOP_CLOSE(struct vnode *vp, int fflag, struct ucred *cred, struct proc *p) 159 { 160 int r; 161 struct vop_close_args a; 162 a.a_vp = vp; 163 a.a_fflag = fflag; 164 a.a_cred = cred; 165 a.a_p = p; 166 167 ASSERT_VP_ISLOCKED(vp); 168 169 if (vp->v_op->vop_close == NULL) 170 return (EOPNOTSUPP); 171 172 vp->v_inflight++; 173 r = (vp->v_op->vop_close)(&a); 174 vp->v_inflight--; 175 return r; 176 } 177 178 int 179 VOP_ACCESS(struct vnode *vp, int mode, struct ucred *cred, struct proc *p) 180 { 181 struct vop_access_args a; 182 a.a_vp = vp; 183 a.a_mode = mode; 184 a.a_cred = cred; 185 a.a_p = p; 186 187 ASSERT_VP_ISLOCKED(vp); 188 189 if (vp->v_op->vop_access == NULL) 190 return (EOPNOTSUPP); 191 192 return ((vp->v_op->vop_access)(&a)); 193 } 194 195 int 196 VOP_GETATTR(struct vnode *vp, struct vattr *vap, struct ucred *cred, 197 struct proc *p) 198 { 199 struct vop_getattr_args a; 200 a.a_vp = vp; 201 a.a_vap = vap; 202 a.a_cred = cred; 203 a.a_p = p; 204 205 if (vp->v_op->vop_getattr == NULL) 206 return (EOPNOTSUPP); 207 208 return ((vp->v_op->vop_getattr)(&a)); 209 } 210 211 int 212 VOP_SETATTR(struct vnode *vp, struct vattr *vap, struct ucred *cred, 213 struct proc *p) 214 { 215 int r; 216 struct vop_setattr_args a; 217 a.a_vp = vp; 218 a.a_vap = vap; 219 a.a_cred = cred; 220 a.a_p = p; 221 222 ASSERT_VP_ISLOCKED(vp); 223 224 if (vp->v_op->vop_setattr == NULL) 225 return (EOPNOTSUPP); 226 227 vp->v_inflight++; 228 r = (vp->v_op->vop_setattr)(&a); 229 vp->v_inflight--; 230 return r; 231 } 232 233 int 234 VOP_READ(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred) 235 { 236 struct vop_read_args a; 237 a.a_vp = vp; 238 a.a_uio = uio; 239 a.a_ioflag = ioflag; 240 a.a_cred = cred; 241 242 ASSERT_VP_ISLOCKED(vp); 243 244 if (vp->v_op->vop_read == NULL) 245 return (EOPNOTSUPP); 246 247 return ((vp->v_op->vop_read)(&a)); 248 } 249 250 int 251 VOP_WRITE(struct vnode *vp, struct uio *uio, int ioflag, 252 struct ucred *cred) 253 { 254 int r; 255 struct vop_write_args a; 256 a.a_vp = vp; 257 a.a_uio = uio; 258 a.a_ioflag = ioflag; 259 a.a_cred = cred; 260 261 ASSERT_VP_ISLOCKED(vp); 262 263 if (vp->v_op->vop_write == NULL) 264 return (EOPNOTSUPP); 265 266 vp->v_inflight++; 267 r = (vp->v_op->vop_write)(&a); 268 vp->v_inflight--; 269 return r; 270 } 271 272 int 273 VOP_IOCTL(struct vnode *vp, u_long command, void *data, int fflag, 274 struct ucred *cred, struct proc *p) 275 { 276 int r; 277 struct vop_ioctl_args a; 278 a.a_vp = vp; 279 a.a_command = command; 280 a.a_data = data; 281 a.a_fflag = fflag; 282 a.a_cred = cred; 283 a.a_p = p; 284 285 if (vp->v_op->vop_ioctl == NULL) 286 return (EOPNOTSUPP); 287 288 vp->v_inflight++; 289 r = (vp->v_op->vop_ioctl)(&a); 290 vp->v_inflight--; 291 return r; 292 } 293 294 int 295 VOP_POLL(struct vnode *vp, int fflag, int events, struct proc *p) 296 { 297 struct vop_poll_args a; 298 a.a_vp = vp; 299 a.a_fflag = fflag; 300 a.a_events = events; 301 a.a_p = p; 302 303 if (vp->v_op->vop_poll == NULL) 304 return (EOPNOTSUPP); 305 306 return ((vp->v_op->vop_poll)(&a)); 307 } 308 309 int 310 VOP_KQFILTER(struct vnode *vp, int fflag, struct knote *kn) 311 { 312 struct vop_kqfilter_args a; 313 a.a_vp = vp; 314 a.a_fflag = fflag; 315 a.a_kn = kn; 316 317 if (vp->v_op->vop_kqfilter == NULL) 318 return (EOPNOTSUPP); 319 320 return ((vp->v_op->vop_kqfilter)(&a)); 321 } 322 323 int 324 VOP_REVOKE(struct vnode *vp, int flags) 325 { 326 struct vop_revoke_args a; 327 a.a_vp = vp; 328 a.a_flags = flags; 329 330 if (vp->v_op->vop_revoke == NULL) 331 return (EOPNOTSUPP); 332 333 return ((vp->v_op->vop_revoke)(&a)); 334 } 335 336 int 337 VOP_FSYNC(struct vnode *vp, struct ucred *cred, int waitfor, 338 struct proc *p) 339 { 340 int r, s; 341 struct vop_fsync_args a; 342 a.a_vp = vp; 343 a.a_cred = cred; 344 a.a_waitfor = waitfor; 345 a.a_p = p; 346 347 ASSERT_VP_ISLOCKED(vp); 348 349 if (vp->v_op->vop_fsync == NULL) 350 return (EOPNOTSUPP); 351 352 vp->v_inflight++; 353 r = (vp->v_op->vop_fsync)(&a); 354 vp->v_inflight--; 355 s = splbio(); 356 if (r == 0 && vp->v_bioflag & VBIOERROR) 357 r = EIO; 358 splx(s); 359 return r; 360 } 361 362 int 363 VOP_REMOVE(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 364 { 365 int r; 366 struct vop_remove_args a; 367 a.a_dvp = dvp; 368 a.a_vp = vp; 369 a.a_cnp = cnp; 370 371 ASSERT_VP_ISLOCKED(dvp); 372 ASSERT_VP_ISLOCKED(vp); 373 374 if (dvp->v_op->vop_remove == NULL) 375 return (EOPNOTSUPP); 376 377 dvp->v_inflight++; 378 r = (dvp->v_op->vop_remove)(&a); 379 dvp->v_inflight--; 380 return r; 381 } 382 383 int 384 VOP_LINK(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 385 { 386 int r; 387 struct vop_link_args a; 388 a.a_dvp = dvp; 389 a.a_vp = vp; 390 a.a_cnp = cnp; 391 392 ASSERT_VP_ISLOCKED(dvp); 393 394 if (dvp->v_op->vop_link == NULL) 395 return (EOPNOTSUPP); 396 397 dvp->v_inflight++; 398 vp->v_inflight++; 399 r = (dvp->v_op->vop_link)(&a); 400 dvp->v_inflight--; 401 vp->v_inflight--; 402 return r; 403 } 404 405 int 406 VOP_RENAME(struct vnode *fdvp, struct vnode *fvp, 407 struct componentname *fcnp, struct vnode *tdvp, struct vnode *tvp, 408 struct componentname *tcnp) 409 { 410 int r; 411 struct vop_rename_args a; 412 a.a_fdvp = fdvp; 413 a.a_fvp = fvp; 414 a.a_fcnp = fcnp; 415 a.a_tdvp = tdvp; 416 a.a_tvp = tvp; 417 a.a_tcnp = tcnp; 418 419 ASSERT_VP_ISLOCKED(tdvp); 420 421 if (fdvp->v_op->vop_rename == NULL) 422 return (EOPNOTSUPP); 423 424 fdvp->v_inflight++; 425 tdvp->v_inflight++; 426 r = (fdvp->v_op->vop_rename)(&a); 427 fdvp->v_inflight--; 428 tdvp->v_inflight--; 429 return r; 430 } 431 432 int 433 VOP_MKDIR(struct vnode *dvp, struct vnode **vpp, 434 struct componentname *cnp, struct vattr *vap) 435 { 436 int r; 437 struct vop_mkdir_args a; 438 a.a_dvp = dvp; 439 a.a_vpp = vpp; 440 a.a_cnp = cnp; 441 a.a_vap = vap; 442 443 ASSERT_VP_ISLOCKED(dvp); 444 445 if (dvp->v_op->vop_mkdir == NULL) 446 return (EOPNOTSUPP); 447 448 dvp->v_inflight++; 449 r = (dvp->v_op->vop_mkdir)(&a); 450 dvp->v_inflight--; 451 return r; 452 } 453 454 int 455 VOP_RMDIR(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 456 { 457 int r; 458 struct vop_rmdir_args a; 459 a.a_dvp = dvp; 460 a.a_vp = vp; 461 a.a_cnp = cnp; 462 463 ASSERT_VP_ISLOCKED(dvp); 464 ASSERT_VP_ISLOCKED(vp); 465 466 KASSERT(dvp != vp); 467 468 if (dvp->v_op->vop_rmdir == NULL) 469 return (EOPNOTSUPP); 470 471 dvp->v_inflight++; 472 vp->v_inflight++; 473 r = (dvp->v_op->vop_rmdir)(&a); 474 dvp->v_inflight--; 475 vp->v_inflight--; 476 return r; 477 } 478 479 int 480 VOP_SYMLINK(struct vnode *dvp, struct vnode **vpp, 481 struct componentname *cnp, struct vattr *vap, char *target) 482 { 483 int r; 484 struct vop_symlink_args a; 485 a.a_dvp = dvp; 486 a.a_vpp = vpp; 487 a.a_cnp = cnp; 488 a.a_vap = vap; 489 a.a_target = target; 490 491 ASSERT_VP_ISLOCKED(dvp); 492 493 if (dvp->v_op->vop_symlink == NULL) 494 return (EOPNOTSUPP); 495 496 dvp->v_inflight++; 497 r = (dvp->v_op->vop_symlink)(&a); 498 dvp->v_inflight--; 499 return r; 500 } 501 502 int 503 VOP_READDIR(struct vnode *vp, struct uio *uio, struct ucred *cred, 504 int *eofflag) 505 { 506 int r; 507 struct vop_readdir_args a; 508 a.a_vp = vp; 509 a.a_uio = uio; 510 a.a_cred = cred; 511 a.a_eofflag = eofflag; 512 513 ASSERT_VP_ISLOCKED(vp); 514 515 if (vp->v_op->vop_readdir == NULL) 516 return (EOPNOTSUPP); 517 518 vp->v_inflight++; 519 r = (vp->v_op->vop_readdir)(&a); 520 vp->v_inflight--; 521 return r; 522 } 523 524 int 525 VOP_READLINK(struct vnode *vp, struct uio *uio, struct ucred *cred) 526 { 527 int r; 528 struct vop_readlink_args a; 529 a.a_vp = vp; 530 a.a_uio = uio; 531 a.a_cred = cred; 532 533 ASSERT_VP_ISLOCKED(vp); 534 535 if (vp->v_op->vop_readlink == NULL) 536 return (EOPNOTSUPP); 537 538 vp->v_inflight++; 539 r = (vp->v_op->vop_readlink)(&a); 540 vp->v_inflight--; 541 return r; 542 } 543 544 int 545 VOP_ABORTOP(struct vnode *dvp, struct componentname *cnp) 546 { 547 int r; 548 struct vop_abortop_args a; 549 a.a_dvp = dvp; 550 a.a_cnp = cnp; 551 552 if (dvp->v_op->vop_abortop == NULL) 553 return (EOPNOTSUPP); 554 555 dvp->v_inflight++; 556 r = (dvp->v_op->vop_abortop)(&a); 557 dvp->v_inflight--; 558 return r; 559 } 560 561 int 562 VOP_INACTIVE(struct vnode *vp, struct proc *p) 563 { 564 struct vop_inactive_args a; 565 a.a_vp = vp; 566 a.a_p = p; 567 568 ASSERT_VP_ISLOCKED(vp); 569 570 if (vp->v_op->vop_inactive == NULL) 571 return (EOPNOTSUPP); 572 573 return ((vp->v_op->vop_inactive)(&a)); 574 } 575 576 int 577 VOP_RECLAIM(struct vnode *vp, struct proc *p) 578 { 579 int r; 580 struct vop_reclaim_args a; 581 a.a_vp = vp; 582 a.a_p = p; 583 584 if (vp->v_op->vop_reclaim == NULL) 585 return (EOPNOTSUPP); 586 587 vp->v_inflight++; 588 r = (vp->v_op->vop_reclaim)(&a); 589 vp->v_inflight--; 590 return r; 591 } 592 593 int 594 VOP_LOCK(struct vnode *vp, int flags) 595 { 596 struct vop_lock_args a; 597 a.a_vp = vp; 598 a.a_flags = flags; 599 600 if (vp->v_op->vop_lock == NULL) 601 return (EOPNOTSUPP); 602 603 return ((vp->v_op->vop_lock)(&a)); 604 } 605 606 int 607 VOP_UNLOCK(struct vnode *vp) 608 { 609 struct vop_unlock_args a; 610 a.a_vp = vp; 611 612 if (vp->v_op->vop_unlock == NULL) 613 return (EOPNOTSUPP); 614 615 return ((vp->v_op->vop_unlock)(&a)); 616 } 617 618 int 619 VOP_BMAP(struct vnode *vp, daddr_t bn, struct vnode **vpp, 620 daddr_t *bnp, int *runp) 621 { 622 struct vop_bmap_args a; 623 a.a_vp = vp; 624 a.a_bn = bn; 625 a.a_vpp = vpp; 626 a.a_bnp = bnp; 627 a.a_runp = runp; 628 629 ASSERT_VP_ISLOCKED(vp); 630 631 if (vp->v_op->vop_bmap == NULL) 632 return (EOPNOTSUPP); 633 634 return ((vp->v_op->vop_bmap)(&a)); 635 } 636 637 int 638 VOP_PRINT(struct vnode *vp) 639 { 640 struct vop_print_args a; 641 a.a_vp = vp; 642 643 if (vp->v_op->vop_print == NULL) 644 return (EOPNOTSUPP); 645 646 return ((vp->v_op->vop_print)(&a)); 647 } 648 649 int 650 VOP_PATHCONF(struct vnode *vp, int name, register_t *retval) 651 { 652 struct vop_pathconf_args a; 653 654 /* 655 * Handle names that are constant across filesystem 656 */ 657 switch (name) { 658 case _PC_PATH_MAX: 659 *retval = PATH_MAX; 660 return (0); 661 case _PC_PIPE_BUF: 662 *retval = PIPE_BUF; 663 return (0); 664 case _PC_ASYNC_IO: 665 case _PC_PRIO_IO: 666 case _PC_SYNC_IO: 667 *retval = 0; 668 return (0); 669 670 } 671 672 a.a_vp = vp; 673 a.a_name = name; 674 a.a_retval = retval; 675 676 ASSERT_VP_ISLOCKED(vp); 677 678 if (vp->v_op->vop_pathconf == NULL) 679 return (EOPNOTSUPP); 680 681 return ((vp->v_op->vop_pathconf)(&a)); 682 } 683 684 int 685 VOP_ADVLOCK(struct vnode *vp, void *id, int op, struct flock *fl, int flags) 686 { 687 struct vop_advlock_args a; 688 a.a_vp = vp; 689 a.a_id = id; 690 a.a_op = op; 691 a.a_fl = fl; 692 a.a_flags = flags; 693 694 if (vp->v_op->vop_advlock == NULL) 695 return (EOPNOTSUPP); 696 697 return (vp->v_op->vop_advlock)(&a); 698 } 699 700 int 701 VOP_STRATEGY(struct buf *bp) 702 { 703 struct vop_strategy_args a; 704 a.a_bp = bp; 705 706 if ((ISSET(bp->b_flags, B_BC)) && (!ISSET(bp->b_flags, B_DMA))) 707 panic("Non dma reachable buffer passed to VOP_STRATEGY"); 708 709 if (bp->b_vp->v_op->vop_strategy == NULL) 710 return (EOPNOTSUPP); 711 712 return ((bp->b_vp->v_op->vop_strategy)(&a)); 713 } 714 715 int 716 VOP_BWRITE(struct buf *bp) 717 { 718 struct vop_bwrite_args a; 719 a.a_bp = bp; 720 721 if (bp->b_vp->v_op->vop_bwrite == NULL) 722 return (EOPNOTSUPP); 723 724 return ((bp->b_vp->v_op->vop_bwrite)(&a)); 725 } 726