1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed 6 * to Berkeley by John Heidemann of the UCLA Ficus project. 7 * 8 * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/bio.h> 41 #include <sys/buf.h> 42 #include <sys/conf.h> 43 #include <sys/event.h> 44 #include <sys/kernel.h> 45 #include <sys/limits.h> 46 #include <sys/lock.h> 47 #include <sys/lockf.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/mutex.h> 51 #include <sys/namei.h> 52 #include <sys/fcntl.h> 53 #include <sys/unistd.h> 54 #include <sys/vnode.h> 55 #include <sys/dirent.h> 56 #include <sys/poll.h> 57 58 #include <security/mac/mac_framework.h> 59 60 #include <vm/vm.h> 61 #include <vm/vm_object.h> 62 #include <vm/vm_extern.h> 63 #include <vm/pmap.h> 64 #include <vm/vm_map.h> 65 #include <vm/vm_page.h> 66 #include <vm/vm_pager.h> 67 #include <vm/vnode_pager.h> 68 69 static int vop_nolookup(struct vop_lookup_args *); 70 static int vop_nostrategy(struct vop_strategy_args *); 71 static int get_next_dirent(struct vnode *vp, struct dirent **dpp, 72 char *dirbuf, int dirbuflen, off_t *off, 73 char **cpos, int *len, int *eofflag, 74 struct thread *td); 75 static int dirent_exists(struct vnode *vp, const char *dirname, 76 struct thread *td); 77 78 #define DIRENT_MINSIZE (sizeof(struct dirent) - (MAXNAMLEN+1) + 4) 79 80 /* 81 * This vnode table stores what we want to do if the filesystem doesn't 82 * implement a particular VOP. 83 * 84 * If there is no specific entry here, we will return EOPNOTSUPP. 85 * 86 * Note that every filesystem has to implement either vop_access 87 * or vop_accessx; failing to do so will result in immediate crash 88 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(), 89 * which calls vop_stdaccess() etc. 90 */ 91 92 struct vop_vector default_vnodeops = { 93 .vop_default = NULL, 94 .vop_bypass = VOP_EOPNOTSUPP, 95 96 .vop_access = vop_stdaccess, 97 .vop_accessx = vop_stdaccessx, 98 .vop_advlock = vop_stdadvlock, 99 .vop_advlockasync = vop_stdadvlockasync, 100 .vop_bmap = vop_stdbmap, 101 .vop_close = VOP_NULL, 102 .vop_fsync = VOP_NULL, 103 .vop_getpages = vop_stdgetpages, 104 .vop_getwritemount = vop_stdgetwritemount, 105 .vop_inactive = VOP_NULL, 106 .vop_ioctl = VOP_ENOTTY, 107 .vop_kqfilter = vop_stdkqfilter, 108 .vop_islocked = vop_stdislocked, 109 .vop_lock1 = vop_stdlock, 110 .vop_lookup = vop_nolookup, 111 .vop_open = VOP_NULL, 112 .vop_pathconf = VOP_EINVAL, 113 .vop_poll = vop_nopoll, 114 .vop_putpages = vop_stdputpages, 115 .vop_readlink = VOP_EINVAL, 116 .vop_revoke = VOP_PANIC, 117 .vop_strategy = vop_nostrategy, 118 .vop_unlock = vop_stdunlock, 119 .vop_vptocnp = vop_stdvptocnp, 120 .vop_vptofh = vop_stdvptofh, 121 }; 122 123 /* 124 * Series of placeholder functions for various error returns for 125 * VOPs. 126 */ 127 128 int 129 vop_eopnotsupp(struct vop_generic_args *ap) 130 { 131 /* 132 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 133 */ 134 135 return (EOPNOTSUPP); 136 } 137 138 int 139 vop_ebadf(struct vop_generic_args *ap) 140 { 141 142 return (EBADF); 143 } 144 145 int 146 vop_enotty(struct vop_generic_args *ap) 147 { 148 149 return (ENOTTY); 150 } 151 152 int 153 vop_einval(struct vop_generic_args *ap) 154 { 155 156 return (EINVAL); 157 } 158 159 int 160 vop_enoent(struct vop_generic_args *ap) 161 { 162 163 return (ENOENT); 164 } 165 166 int 167 vop_null(struct vop_generic_args *ap) 168 { 169 170 return (0); 171 } 172 173 /* 174 * Helper function to panic on some bad VOPs in some filesystems. 175 */ 176 int 177 vop_panic(struct vop_generic_args *ap) 178 { 179 180 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 181 } 182 183 /* 184 * vop_std<something> and vop_no<something> are default functions for use by 185 * filesystems that need the "default reasonable" implementation for a 186 * particular operation. 187 * 188 * The documentation for the operations they implement exists (if it exists) 189 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 190 */ 191 192 /* 193 * Default vop for filesystems that do not support name lookup 194 */ 195 static int 196 vop_nolookup(ap) 197 struct vop_lookup_args /* { 198 struct vnode *a_dvp; 199 struct vnode **a_vpp; 200 struct componentname *a_cnp; 201 } */ *ap; 202 { 203 204 *ap->a_vpp = NULL; 205 return (ENOTDIR); 206 } 207 208 /* 209 * vop_nostrategy: 210 * 211 * Strategy routine for VFS devices that have none. 212 * 213 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 214 * routine. Typically this is done for a BIO_READ strategy call. 215 * Typically B_INVAL is assumed to already be clear prior to a write 216 * and should not be cleared manually unless you just made the buffer 217 * invalid. BIO_ERROR should be cleared either way. 218 */ 219 220 static int 221 vop_nostrategy (struct vop_strategy_args *ap) 222 { 223 printf("No strategy for buffer at %p\n", ap->a_bp); 224 vprint("vnode", ap->a_vp); 225 ap->a_bp->b_ioflags |= BIO_ERROR; 226 ap->a_bp->b_error = EOPNOTSUPP; 227 bufdone(ap->a_bp); 228 return (EOPNOTSUPP); 229 } 230 231 static int 232 get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf, 233 int dirbuflen, off_t *off, char **cpos, int *len, 234 int *eofflag, struct thread *td) 235 { 236 int error, reclen; 237 struct uio uio; 238 struct iovec iov; 239 struct dirent *dp; 240 241 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 242 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 243 244 if (*len == 0) { 245 iov.iov_base = dirbuf; 246 iov.iov_len = dirbuflen; 247 248 uio.uio_iov = &iov; 249 uio.uio_iovcnt = 1; 250 uio.uio_offset = *off; 251 uio.uio_resid = dirbuflen; 252 uio.uio_segflg = UIO_SYSSPACE; 253 uio.uio_rw = UIO_READ; 254 uio.uio_td = td; 255 256 *eofflag = 0; 257 258 #ifdef MAC 259 error = mac_vnode_check_readdir(td->td_ucred, vp); 260 if (error == 0) 261 #endif 262 error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag, 263 NULL, NULL); 264 if (error) 265 return (error); 266 267 *off = uio.uio_offset; 268 269 *cpos = dirbuf; 270 *len = (dirbuflen - uio.uio_resid); 271 } 272 273 dp = (struct dirent *)(*cpos); 274 reclen = dp->d_reclen; 275 *dpp = dp; 276 277 /* check for malformed directory.. */ 278 if (reclen < DIRENT_MINSIZE) 279 return (EINVAL); 280 281 *cpos += reclen; 282 *len -= reclen; 283 284 return (0); 285 } 286 287 /* 288 * Check if a named file exists in a given directory vnode. 289 */ 290 static int 291 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 292 { 293 char *dirbuf, *cpos; 294 int error, eofflag, dirbuflen, len, found; 295 off_t off; 296 struct dirent *dp; 297 struct vattr va; 298 299 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 300 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 301 302 found = 0; 303 304 error = VOP_GETATTR(vp, &va, td->td_ucred); 305 if (error) 306 return (found); 307 308 dirbuflen = DEV_BSIZE; 309 if (dirbuflen < va.va_blocksize) 310 dirbuflen = va.va_blocksize; 311 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 312 313 off = 0; 314 len = 0; 315 do { 316 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off, 317 &cpos, &len, &eofflag, td); 318 if (error) 319 goto out; 320 321 if ((dp->d_type != DT_WHT) && 322 !strcmp(dp->d_name, dirname)) { 323 found = 1; 324 goto out; 325 } 326 } while (len > 0 || !eofflag); 327 328 out: 329 free(dirbuf, M_TEMP); 330 return (found); 331 } 332 333 int 334 vop_stdaccess(struct vop_access_args *ap) 335 { 336 337 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | 338 VAPPEND)) == 0, ("invalid bit in accmode")); 339 340 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td)); 341 } 342 343 int 344 vop_stdaccessx(struct vop_accessx_args *ap) 345 { 346 int error; 347 accmode_t accmode = ap->a_accmode; 348 349 error = vfs_unixify_accmode(&accmode); 350 if (error != 0) 351 return (error); 352 353 if (accmode == 0) 354 return (0); 355 356 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 357 } 358 359 /* 360 * Advisory record locking support 361 */ 362 int 363 vop_stdadvlock(struct vop_advlock_args *ap) 364 { 365 struct vnode *vp; 366 struct ucred *cred; 367 struct vattr vattr; 368 int error; 369 370 vp = ap->a_vp; 371 cred = curthread->td_ucred; 372 vn_lock(vp, LK_SHARED | LK_RETRY); 373 error = VOP_GETATTR(vp, &vattr, cred); 374 VOP_UNLOCK(vp, 0); 375 if (error) 376 return (error); 377 378 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size)); 379 } 380 381 int 382 vop_stdadvlockasync(struct vop_advlockasync_args *ap) 383 { 384 struct vnode *vp; 385 struct ucred *cred; 386 struct vattr vattr; 387 int error; 388 389 vp = ap->a_vp; 390 cred = curthread->td_ucred; 391 vn_lock(vp, LK_SHARED | LK_RETRY); 392 error = VOP_GETATTR(vp, &vattr, cred); 393 VOP_UNLOCK(vp, 0); 394 if (error) 395 return (error); 396 397 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 398 } 399 400 /* 401 * vop_stdpathconf: 402 * 403 * Standard implementation of POSIX pathconf, to get information about limits 404 * for a filesystem. 405 * Override per filesystem for the case where the filesystem has smaller 406 * limits. 407 */ 408 int 409 vop_stdpathconf(ap) 410 struct vop_pathconf_args /* { 411 struct vnode *a_vp; 412 int a_name; 413 int *a_retval; 414 } */ *ap; 415 { 416 417 switch (ap->a_name) { 418 case _PC_NAME_MAX: 419 *ap->a_retval = NAME_MAX; 420 return (0); 421 case _PC_PATH_MAX: 422 *ap->a_retval = PATH_MAX; 423 return (0); 424 case _PC_LINK_MAX: 425 *ap->a_retval = LINK_MAX; 426 return (0); 427 case _PC_MAX_CANON: 428 *ap->a_retval = MAX_CANON; 429 return (0); 430 case _PC_MAX_INPUT: 431 *ap->a_retval = MAX_INPUT; 432 return (0); 433 case _PC_PIPE_BUF: 434 *ap->a_retval = PIPE_BUF; 435 return (0); 436 case _PC_CHOWN_RESTRICTED: 437 *ap->a_retval = 1; 438 return (0); 439 case _PC_VDISABLE: 440 *ap->a_retval = _POSIX_VDISABLE; 441 return (0); 442 default: 443 return (EINVAL); 444 } 445 /* NOTREACHED */ 446 } 447 448 /* 449 * Standard lock, unlock and islocked functions. 450 */ 451 int 452 vop_stdlock(ap) 453 struct vop_lock1_args /* { 454 struct vnode *a_vp; 455 int a_flags; 456 char *file; 457 int line; 458 } */ *ap; 459 { 460 struct vnode *vp = ap->a_vp; 461 462 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp), 463 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file, 464 ap->a_line)); 465 } 466 467 /* See above. */ 468 int 469 vop_stdunlock(ap) 470 struct vop_unlock_args /* { 471 struct vnode *a_vp; 472 int a_flags; 473 } */ *ap; 474 { 475 struct vnode *vp = ap->a_vp; 476 477 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp))); 478 } 479 480 /* See above. */ 481 int 482 vop_stdislocked(ap) 483 struct vop_islocked_args /* { 484 struct vnode *a_vp; 485 } */ *ap; 486 { 487 488 return (lockstatus(ap->a_vp->v_vnlock)); 489 } 490 491 /* 492 * Return true for select/poll. 493 */ 494 int 495 vop_nopoll(ap) 496 struct vop_poll_args /* { 497 struct vnode *a_vp; 498 int a_events; 499 struct ucred *a_cred; 500 struct thread *a_td; 501 } */ *ap; 502 { 503 504 return (poll_no_poll(ap->a_events)); 505 } 506 507 /* 508 * Implement poll for local filesystems that support it. 509 */ 510 int 511 vop_stdpoll(ap) 512 struct vop_poll_args /* { 513 struct vnode *a_vp; 514 int a_events; 515 struct ucred *a_cred; 516 struct thread *a_td; 517 } */ *ap; 518 { 519 if (ap->a_events & ~POLLSTANDARD) 520 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 521 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 522 } 523 524 /* 525 * Return our mount point, as we will take charge of the writes. 526 */ 527 int 528 vop_stdgetwritemount(ap) 529 struct vop_getwritemount_args /* { 530 struct vnode *a_vp; 531 struct mount **a_mpp; 532 } */ *ap; 533 { 534 struct mount *mp; 535 536 /* 537 * XXX Since this is called unlocked we may be recycled while 538 * attempting to ref the mount. If this is the case or mountpoint 539 * will be set to NULL. We only have to prevent this call from 540 * returning with a ref to an incorrect mountpoint. It is not 541 * harmful to return with a ref to our previous mountpoint. 542 */ 543 mp = ap->a_vp->v_mount; 544 if (mp != NULL) { 545 vfs_ref(mp); 546 if (mp != ap->a_vp->v_mount) { 547 vfs_rel(mp); 548 mp = NULL; 549 } 550 } 551 *(ap->a_mpp) = mp; 552 return (0); 553 } 554 555 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 556 int 557 vop_stdbmap(ap) 558 struct vop_bmap_args /* { 559 struct vnode *a_vp; 560 daddr_t a_bn; 561 struct bufobj **a_bop; 562 daddr_t *a_bnp; 563 int *a_runp; 564 int *a_runb; 565 } */ *ap; 566 { 567 568 if (ap->a_bop != NULL) 569 *ap->a_bop = &ap->a_vp->v_bufobj; 570 if (ap->a_bnp != NULL) 571 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 572 if (ap->a_runp != NULL) 573 *ap->a_runp = 0; 574 if (ap->a_runb != NULL) 575 *ap->a_runb = 0; 576 return (0); 577 } 578 579 int 580 vop_stdfsync(ap) 581 struct vop_fsync_args /* { 582 struct vnode *a_vp; 583 struct ucred *a_cred; 584 int a_waitfor; 585 struct thread *a_td; 586 } */ *ap; 587 { 588 struct vnode *vp = ap->a_vp; 589 struct buf *bp; 590 struct bufobj *bo; 591 struct buf *nbp; 592 int error = 0; 593 int maxretry = 1000; /* large, arbitrarily chosen */ 594 595 bo = &vp->v_bufobj; 596 BO_LOCK(bo); 597 loop1: 598 /* 599 * MARK/SCAN initialization to avoid infinite loops. 600 */ 601 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 602 bp->b_vflags &= ~BV_SCANNED; 603 bp->b_error = 0; 604 } 605 606 /* 607 * Flush all dirty buffers associated with a vnode. 608 */ 609 loop2: 610 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 611 if ((bp->b_vflags & BV_SCANNED) != 0) 612 continue; 613 bp->b_vflags |= BV_SCANNED; 614 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) 615 continue; 616 BO_UNLOCK(bo); 617 KASSERT(bp->b_bufobj == bo, 618 ("bp %p wrong b_bufobj %p should be %p", 619 bp, bp->b_bufobj, bo)); 620 if ((bp->b_flags & B_DELWRI) == 0) 621 panic("fsync: not dirty"); 622 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 623 vfs_bio_awrite(bp); 624 } else { 625 bremfree(bp); 626 bawrite(bp); 627 } 628 BO_LOCK(bo); 629 goto loop2; 630 } 631 632 /* 633 * If synchronous the caller expects us to completely resolve all 634 * dirty buffers in the system. Wait for in-progress I/O to 635 * complete (which could include background bitmap writes), then 636 * retry if dirty blocks still exist. 637 */ 638 if (ap->a_waitfor == MNT_WAIT) { 639 bufobj_wwait(bo, 0, 0); 640 if (bo->bo_dirty.bv_cnt > 0) { 641 /* 642 * If we are unable to write any of these buffers 643 * then we fail now rather than trying endlessly 644 * to write them out. 645 */ 646 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 647 if ((error = bp->b_error) == 0) 648 continue; 649 if (error == 0 && --maxretry >= 0) 650 goto loop1; 651 error = EAGAIN; 652 } 653 } 654 BO_UNLOCK(bo); 655 if (error == EAGAIN) 656 vprint("fsync: giving up on dirty", vp); 657 658 return (error); 659 } 660 661 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 662 int 663 vop_stdgetpages(ap) 664 struct vop_getpages_args /* { 665 struct vnode *a_vp; 666 vm_page_t *a_m; 667 int a_count; 668 int a_reqpage; 669 vm_ooffset_t a_offset; 670 } */ *ap; 671 { 672 673 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 674 ap->a_count, ap->a_reqpage); 675 } 676 677 int 678 vop_stdkqfilter(struct vop_kqfilter_args *ap) 679 { 680 return vfs_kqfilter(ap); 681 } 682 683 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 684 int 685 vop_stdputpages(ap) 686 struct vop_putpages_args /* { 687 struct vnode *a_vp; 688 vm_page_t *a_m; 689 int a_count; 690 int a_sync; 691 int *a_rtvals; 692 vm_ooffset_t a_offset; 693 } */ *ap; 694 { 695 696 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 697 ap->a_sync, ap->a_rtvals); 698 } 699 700 int 701 vop_stdvptofh(struct vop_vptofh_args *ap) 702 { 703 return (EOPNOTSUPP); 704 } 705 706 int 707 vop_stdvptocnp(struct vop_vptocnp_args *ap) 708 { 709 struct vnode *vp = ap->a_vp; 710 struct vnode **dvp = ap->a_vpp; 711 struct ucred *cred = ap->a_cred; 712 char *buf = ap->a_buf; 713 int *buflen = ap->a_buflen; 714 char *dirbuf, *cpos; 715 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 716 off_t off; 717 ino_t fileno; 718 struct vattr va; 719 struct nameidata nd; 720 struct thread *td; 721 struct dirent *dp; 722 struct vnode *mvp; 723 724 i = *buflen; 725 error = 0; 726 covered = 0; 727 td = curthread; 728 729 if (vp->v_type != VDIR) 730 return (ENOENT); 731 732 error = VOP_GETATTR(vp, &va, cred); 733 if (error) 734 return (error); 735 736 VREF(vp); 737 locked = VOP_ISLOCKED(vp); 738 VOP_UNLOCK(vp, 0); 739 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 740 "..", vp, td); 741 flags = FREAD; 742 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 743 if (error) { 744 vn_lock(vp, locked | LK_RETRY); 745 return (error); 746 } 747 NDFREE(&nd, NDF_ONLY_PNBUF); 748 749 mvp = *dvp = nd.ni_vp; 750 751 if (vp->v_mount != (*dvp)->v_mount && 752 ((*dvp)->v_vflag & VV_ROOT) && 753 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 754 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 755 VREF(mvp); 756 VOP_UNLOCK(mvp, 0); 757 vn_close(mvp, FREAD, cred, td); 758 VREF(*dvp); 759 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 760 covered = 1; 761 } 762 763 fileno = va.va_fileid; 764 765 dirbuflen = DEV_BSIZE; 766 if (dirbuflen < va.va_blocksize) 767 dirbuflen = va.va_blocksize; 768 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 769 770 if ((*dvp)->v_type != VDIR) { 771 error = ENOENT; 772 goto out; 773 } 774 775 off = 0; 776 len = 0; 777 do { 778 /* call VOP_READDIR of parent */ 779 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 780 &cpos, &len, &eofflag, td); 781 if (error) 782 goto out; 783 784 if ((dp->d_type != DT_WHT) && 785 (dp->d_fileno == fileno)) { 786 if (covered) { 787 VOP_UNLOCK(*dvp, 0); 788 vn_lock(mvp, LK_EXCLUSIVE | LK_RETRY); 789 if (dirent_exists(mvp, dp->d_name, td)) { 790 error = ENOENT; 791 VOP_UNLOCK(mvp, 0); 792 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 793 goto out; 794 } 795 VOP_UNLOCK(mvp, 0); 796 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 797 } 798 i -= dp->d_namlen; 799 800 if (i < 0) { 801 error = ENOMEM; 802 goto out; 803 } 804 bcopy(dp->d_name, buf + i, dp->d_namlen); 805 error = 0; 806 goto out; 807 } 808 } while (len > 0 || !eofflag); 809 error = ENOENT; 810 811 out: 812 free(dirbuf, M_TEMP); 813 if (!error) { 814 *buflen = i; 815 vhold(*dvp); 816 } 817 if (covered) { 818 vput(*dvp); 819 vrele(mvp); 820 } else { 821 VOP_UNLOCK(mvp, 0); 822 vn_close(mvp, FREAD, cred, td); 823 } 824 vn_lock(vp, locked | LK_RETRY); 825 return (error); 826 } 827 828 /* 829 * vfs default ops 830 * used to fill the vfs function table to get reasonable default return values. 831 */ 832 int 833 vfs_stdroot (mp, flags, vpp) 834 struct mount *mp; 835 int flags; 836 struct vnode **vpp; 837 { 838 839 return (EOPNOTSUPP); 840 } 841 842 int 843 vfs_stdstatfs (mp, sbp) 844 struct mount *mp; 845 struct statfs *sbp; 846 { 847 848 return (EOPNOTSUPP); 849 } 850 851 int 852 vfs_stdquotactl (mp, cmds, uid, arg) 853 struct mount *mp; 854 int cmds; 855 uid_t uid; 856 void *arg; 857 { 858 859 return (EOPNOTSUPP); 860 } 861 862 int 863 vfs_stdsync(mp, waitfor) 864 struct mount *mp; 865 int waitfor; 866 { 867 struct vnode *vp, *mvp; 868 struct thread *td; 869 int error, lockreq, allerror = 0; 870 871 td = curthread; 872 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 873 if (waitfor != MNT_WAIT) 874 lockreq |= LK_NOWAIT; 875 /* 876 * Force stale buffer cache information to be flushed. 877 */ 878 MNT_ILOCK(mp); 879 loop: 880 MNT_VNODE_FOREACH(vp, mp, mvp) { 881 /* bv_cnt is an acceptable race here. */ 882 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) 883 continue; 884 VI_LOCK(vp); 885 MNT_IUNLOCK(mp); 886 if ((error = vget(vp, lockreq, td)) != 0) { 887 MNT_ILOCK(mp); 888 if (error == ENOENT) { 889 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); 890 goto loop; 891 } 892 continue; 893 } 894 error = VOP_FSYNC(vp, waitfor, td); 895 if (error) 896 allerror = error; 897 vput(vp); 898 MNT_ILOCK(mp); 899 } 900 MNT_IUNLOCK(mp); 901 return (allerror); 902 } 903 904 int 905 vfs_stdnosync (mp, waitfor) 906 struct mount *mp; 907 int waitfor; 908 { 909 910 return (0); 911 } 912 913 int 914 vfs_stdvget (mp, ino, flags, vpp) 915 struct mount *mp; 916 ino_t ino; 917 int flags; 918 struct vnode **vpp; 919 { 920 921 return (EOPNOTSUPP); 922 } 923 924 int 925 vfs_stdfhtovp (mp, fhp, vpp) 926 struct mount *mp; 927 struct fid *fhp; 928 struct vnode **vpp; 929 { 930 931 return (EOPNOTSUPP); 932 } 933 934 int 935 vfs_stdinit (vfsp) 936 struct vfsconf *vfsp; 937 { 938 939 return (0); 940 } 941 942 int 943 vfs_stduninit (vfsp) 944 struct vfsconf *vfsp; 945 { 946 947 return(0); 948 } 949 950 int 951 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 952 struct mount *mp; 953 int cmd; 954 struct vnode *filename_vp; 955 int attrnamespace; 956 const char *attrname; 957 { 958 959 if (filename_vp != NULL) 960 VOP_UNLOCK(filename_vp, 0); 961 return (EOPNOTSUPP); 962 } 963 964 int 965 vfs_stdsysctl(mp, op, req) 966 struct mount *mp; 967 fsctlop_t op; 968 struct sysctl_req *req; 969 { 970 971 return (EOPNOTSUPP); 972 } 973 974 /* end of vfs default ops */ 975