1 /* $OpenBSD: vfs_vops.c,v 1.25 2020/02/14 11:57:56 claudio 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, struct knote *kn) 311 { 312 struct vop_kqfilter_args a; 313 a.a_vp = vp; 314 a.a_kn = kn; 315 316 if (vp->v_op->vop_kqfilter == NULL) 317 return (EOPNOTSUPP); 318 319 return ((vp->v_op->vop_kqfilter)(&a)); 320 } 321 322 int 323 VOP_REVOKE(struct vnode *vp, int flags) 324 { 325 struct vop_revoke_args a; 326 a.a_vp = vp; 327 a.a_flags = flags; 328 329 if (vp->v_op->vop_revoke == NULL) 330 return (EOPNOTSUPP); 331 332 return ((vp->v_op->vop_revoke)(&a)); 333 } 334 335 int 336 VOP_FSYNC(struct vnode *vp, struct ucred *cred, int waitfor, 337 struct proc *p) 338 { 339 int r, s; 340 struct vop_fsync_args a; 341 a.a_vp = vp; 342 a.a_cred = cred; 343 a.a_waitfor = waitfor; 344 a.a_p = p; 345 346 ASSERT_VP_ISLOCKED(vp); 347 348 if (vp->v_op->vop_fsync == NULL) 349 return (EOPNOTSUPP); 350 351 vp->v_inflight++; 352 r = (vp->v_op->vop_fsync)(&a); 353 vp->v_inflight--; 354 s = splbio(); 355 if (r == 0 && vp->v_bioflag & VBIOERROR) 356 r = EIO; 357 splx(s); 358 return r; 359 } 360 361 int 362 VOP_REMOVE(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 363 { 364 int r; 365 struct vop_remove_args a; 366 a.a_dvp = dvp; 367 a.a_vp = vp; 368 a.a_cnp = cnp; 369 370 ASSERT_VP_ISLOCKED(dvp); 371 ASSERT_VP_ISLOCKED(vp); 372 373 if (dvp->v_op->vop_remove == NULL) 374 return (EOPNOTSUPP); 375 376 dvp->v_inflight++; 377 r = (dvp->v_op->vop_remove)(&a); 378 dvp->v_inflight--; 379 return r; 380 } 381 382 int 383 VOP_LINK(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 384 { 385 int r; 386 struct vop_link_args a; 387 a.a_dvp = dvp; 388 a.a_vp = vp; 389 a.a_cnp = cnp; 390 391 ASSERT_VP_ISLOCKED(dvp); 392 393 if (dvp->v_op->vop_link == NULL) 394 return (EOPNOTSUPP); 395 396 dvp->v_inflight++; 397 vp->v_inflight++; 398 r = (dvp->v_op->vop_link)(&a); 399 dvp->v_inflight--; 400 vp->v_inflight--; 401 return r; 402 } 403 404 int 405 VOP_RENAME(struct vnode *fdvp, struct vnode *fvp, 406 struct componentname *fcnp, struct vnode *tdvp, struct vnode *tvp, 407 struct componentname *tcnp) 408 { 409 int r; 410 struct vop_rename_args a; 411 a.a_fdvp = fdvp; 412 a.a_fvp = fvp; 413 a.a_fcnp = fcnp; 414 a.a_tdvp = tdvp; 415 a.a_tvp = tvp; 416 a.a_tcnp = tcnp; 417 418 ASSERT_VP_ISLOCKED(tdvp); 419 420 if (fdvp->v_op->vop_rename == NULL) 421 return (EOPNOTSUPP); 422 423 fdvp->v_inflight++; 424 tdvp->v_inflight++; 425 r = (fdvp->v_op->vop_rename)(&a); 426 fdvp->v_inflight--; 427 tdvp->v_inflight--; 428 return r; 429 } 430 431 int 432 VOP_MKDIR(struct vnode *dvp, struct vnode **vpp, 433 struct componentname *cnp, struct vattr *vap) 434 { 435 int r; 436 struct vop_mkdir_args a; 437 a.a_dvp = dvp; 438 a.a_vpp = vpp; 439 a.a_cnp = cnp; 440 a.a_vap = vap; 441 442 ASSERT_VP_ISLOCKED(dvp); 443 444 if (dvp->v_op->vop_mkdir == NULL) 445 return (EOPNOTSUPP); 446 447 dvp->v_inflight++; 448 r = (dvp->v_op->vop_mkdir)(&a); 449 dvp->v_inflight--; 450 return r; 451 } 452 453 int 454 VOP_RMDIR(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 455 { 456 int r; 457 struct vop_rmdir_args a; 458 a.a_dvp = dvp; 459 a.a_vp = vp; 460 a.a_cnp = cnp; 461 462 ASSERT_VP_ISLOCKED(dvp); 463 ASSERT_VP_ISLOCKED(vp); 464 465 KASSERT(dvp != vp); 466 467 if (dvp->v_op->vop_rmdir == NULL) 468 return (EOPNOTSUPP); 469 470 dvp->v_inflight++; 471 vp->v_inflight++; 472 r = (dvp->v_op->vop_rmdir)(&a); 473 dvp->v_inflight--; 474 vp->v_inflight--; 475 return r; 476 } 477 478 int 479 VOP_SYMLINK(struct vnode *dvp, struct vnode **vpp, 480 struct componentname *cnp, struct vattr *vap, char *target) 481 { 482 int r; 483 struct vop_symlink_args a; 484 a.a_dvp = dvp; 485 a.a_vpp = vpp; 486 a.a_cnp = cnp; 487 a.a_vap = vap; 488 a.a_target = target; 489 490 ASSERT_VP_ISLOCKED(dvp); 491 492 if (dvp->v_op->vop_symlink == NULL) 493 return (EOPNOTSUPP); 494 495 dvp->v_inflight++; 496 r = (dvp->v_op->vop_symlink)(&a); 497 dvp->v_inflight--; 498 return r; 499 } 500 501 int 502 VOP_READDIR(struct vnode *vp, struct uio *uio, struct ucred *cred, 503 int *eofflag) 504 { 505 int r; 506 struct vop_readdir_args a; 507 a.a_vp = vp; 508 a.a_uio = uio; 509 a.a_cred = cred; 510 a.a_eofflag = eofflag; 511 512 ASSERT_VP_ISLOCKED(vp); 513 514 if (vp->v_op->vop_readdir == NULL) 515 return (EOPNOTSUPP); 516 517 vp->v_inflight++; 518 r = (vp->v_op->vop_readdir)(&a); 519 vp->v_inflight--; 520 return r; 521 } 522 523 int 524 VOP_READLINK(struct vnode *vp, struct uio *uio, struct ucred *cred) 525 { 526 int r; 527 struct vop_readlink_args a; 528 a.a_vp = vp; 529 a.a_uio = uio; 530 a.a_cred = cred; 531 532 ASSERT_VP_ISLOCKED(vp); 533 534 if (vp->v_op->vop_readlink == NULL) 535 return (EOPNOTSUPP); 536 537 vp->v_inflight++; 538 r = (vp->v_op->vop_readlink)(&a); 539 vp->v_inflight--; 540 return r; 541 } 542 543 int 544 VOP_ABORTOP(struct vnode *dvp, struct componentname *cnp) 545 { 546 int r; 547 struct vop_abortop_args a; 548 a.a_dvp = dvp; 549 a.a_cnp = cnp; 550 551 if (dvp->v_op->vop_abortop == NULL) 552 return (EOPNOTSUPP); 553 554 dvp->v_inflight++; 555 r = (dvp->v_op->vop_abortop)(&a); 556 dvp->v_inflight--; 557 return r; 558 } 559 560 int 561 VOP_INACTIVE(struct vnode *vp, struct proc *p) 562 { 563 struct vop_inactive_args a; 564 a.a_vp = vp; 565 a.a_p = p; 566 567 ASSERT_VP_ISLOCKED(vp); 568 569 if (vp->v_op->vop_inactive == NULL) 570 return (EOPNOTSUPP); 571 572 return ((vp->v_op->vop_inactive)(&a)); 573 } 574 575 int 576 VOP_RECLAIM(struct vnode *vp, struct proc *p) 577 { 578 int r; 579 struct vop_reclaim_args a; 580 a.a_vp = vp; 581 a.a_p = p; 582 583 if (vp->v_op->vop_reclaim == NULL) 584 return (EOPNOTSUPP); 585 586 vp->v_inflight++; 587 r = (vp->v_op->vop_reclaim)(&a); 588 vp->v_inflight--; 589 return r; 590 } 591 592 int 593 VOP_LOCK(struct vnode *vp, int flags) 594 { 595 struct vop_lock_args a; 596 a.a_vp = vp; 597 a.a_flags = flags; 598 599 if (vp->v_op->vop_lock == NULL) 600 return (EOPNOTSUPP); 601 602 return ((vp->v_op->vop_lock)(&a)); 603 } 604 605 int 606 VOP_UNLOCK(struct vnode *vp) 607 { 608 struct vop_unlock_args a; 609 a.a_vp = vp; 610 611 if (vp->v_op->vop_unlock == NULL) 612 return (EOPNOTSUPP); 613 614 return ((vp->v_op->vop_unlock)(&a)); 615 } 616 617 int 618 VOP_BMAP(struct vnode *vp, daddr_t bn, struct vnode **vpp, 619 daddr_t *bnp, int *runp) 620 { 621 struct vop_bmap_args a; 622 a.a_vp = vp; 623 a.a_bn = bn; 624 a.a_vpp = vpp; 625 a.a_bnp = bnp; 626 a.a_runp = runp; 627 628 ASSERT_VP_ISLOCKED(vp); 629 630 if (vp->v_op->vop_bmap == NULL) 631 return (EOPNOTSUPP); 632 633 return ((vp->v_op->vop_bmap)(&a)); 634 } 635 636 int 637 VOP_PRINT(struct vnode *vp) 638 { 639 struct vop_print_args a; 640 a.a_vp = vp; 641 642 if (vp->v_op->vop_print == NULL) 643 return (EOPNOTSUPP); 644 645 return ((vp->v_op->vop_print)(&a)); 646 } 647 648 int 649 VOP_PATHCONF(struct vnode *vp, int name, register_t *retval) 650 { 651 struct vop_pathconf_args a; 652 653 /* 654 * Handle names that are constant across filesystem 655 */ 656 switch (name) { 657 case _PC_PATH_MAX: 658 *retval = PATH_MAX; 659 return (0); 660 case _PC_PIPE_BUF: 661 *retval = PIPE_BUF; 662 return (0); 663 case _PC_ASYNC_IO: 664 case _PC_PRIO_IO: 665 case _PC_SYNC_IO: 666 *retval = 0; 667 return (0); 668 669 } 670 671 a.a_vp = vp; 672 a.a_name = name; 673 a.a_retval = retval; 674 675 ASSERT_VP_ISLOCKED(vp); 676 677 if (vp->v_op->vop_pathconf == NULL) 678 return (EOPNOTSUPP); 679 680 return ((vp->v_op->vop_pathconf)(&a)); 681 } 682 683 int 684 VOP_ADVLOCK(struct vnode *vp, void *id, int op, struct flock *fl, int flags) 685 { 686 struct vop_advlock_args a; 687 a.a_vp = vp; 688 a.a_id = id; 689 a.a_op = op; 690 a.a_fl = fl; 691 a.a_flags = flags; 692 693 if (vp->v_op->vop_advlock == NULL) 694 return (EOPNOTSUPP); 695 696 return (vp->v_op->vop_advlock)(&a); 697 } 698 699 int 700 VOP_STRATEGY(struct buf *bp) 701 { 702 struct vop_strategy_args a; 703 a.a_bp = bp; 704 705 if ((ISSET(bp->b_flags, B_BC)) && (!ISSET(bp->b_flags, B_DMA))) 706 panic("Non dma reachable buffer passed to VOP_STRATEGY"); 707 708 if (bp->b_vp->v_op->vop_strategy == NULL) 709 return (EOPNOTSUPP); 710 711 return ((bp->b_vp->v_op->vop_strategy)(&a)); 712 } 713 714 int 715 VOP_BWRITE(struct buf *bp) 716 { 717 struct vop_bwrite_args a; 718 a.a_bp = bp; 719 720 if (bp->b_vp->v_op->vop_bwrite == NULL) 721 return (EOPNOTSUPP); 722 723 return ((bp->b_vp->v_op->vop_bwrite)(&a)); 724 } 725