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_norename(struct vop_rename_args *); 71 static int vop_nostrategy(struct vop_strategy_args *); 72 static int get_next_dirent(struct vnode *vp, struct dirent **dpp, 73 char *dirbuf, int dirbuflen, off_t *off, 74 char **cpos, int *len, int *eofflag, 75 struct thread *td); 76 static int dirent_exists(struct vnode *vp, const char *dirname, 77 struct thread *td); 78 79 #define DIRENT_MINSIZE (sizeof(struct dirent) - (MAXNAMLEN+1) + 4) 80 81 /* 82 * This vnode table stores what we want to do if the filesystem doesn't 83 * implement a particular VOP. 84 * 85 * If there is no specific entry here, we will return EOPNOTSUPP. 86 * 87 * Note that every filesystem has to implement either vop_access 88 * or vop_accessx; failing to do so will result in immediate crash 89 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(), 90 * which calls vop_stdaccess() etc. 91 */ 92 93 struct vop_vector default_vnodeops = { 94 .vop_default = NULL, 95 .vop_bypass = VOP_EOPNOTSUPP, 96 97 .vop_access = vop_stdaccess, 98 .vop_accessx = vop_stdaccessx, 99 .vop_advlock = vop_stdadvlock, 100 .vop_advlockasync = vop_stdadvlockasync, 101 .vop_advlockpurge = vop_stdadvlockpurge, 102 .vop_bmap = vop_stdbmap, 103 .vop_close = VOP_NULL, 104 .vop_fsync = VOP_NULL, 105 .vop_getpages = vop_stdgetpages, 106 .vop_getwritemount = vop_stdgetwritemount, 107 .vop_inactive = VOP_NULL, 108 .vop_ioctl = VOP_ENOTTY, 109 .vop_kqfilter = vop_stdkqfilter, 110 .vop_islocked = vop_stdislocked, 111 .vop_lock1 = vop_stdlock, 112 .vop_lookup = vop_nolookup, 113 .vop_open = VOP_NULL, 114 .vop_pathconf = VOP_EINVAL, 115 .vop_poll = vop_nopoll, 116 .vop_putpages = vop_stdputpages, 117 .vop_readlink = VOP_EINVAL, 118 .vop_rename = vop_norename, 119 .vop_revoke = VOP_PANIC, 120 .vop_strategy = vop_nostrategy, 121 .vop_unlock = vop_stdunlock, 122 .vop_vptocnp = vop_stdvptocnp, 123 .vop_vptofh = vop_stdvptofh, 124 }; 125 126 /* 127 * Series of placeholder functions for various error returns for 128 * VOPs. 129 */ 130 131 int 132 vop_eopnotsupp(struct vop_generic_args *ap) 133 { 134 /* 135 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 136 */ 137 138 return (EOPNOTSUPP); 139 } 140 141 int 142 vop_ebadf(struct vop_generic_args *ap) 143 { 144 145 return (EBADF); 146 } 147 148 int 149 vop_enotty(struct vop_generic_args *ap) 150 { 151 152 return (ENOTTY); 153 } 154 155 int 156 vop_einval(struct vop_generic_args *ap) 157 { 158 159 return (EINVAL); 160 } 161 162 int 163 vop_enoent(struct vop_generic_args *ap) 164 { 165 166 return (ENOENT); 167 } 168 169 int 170 vop_null(struct vop_generic_args *ap) 171 { 172 173 return (0); 174 } 175 176 /* 177 * Helper function to panic on some bad VOPs in some filesystems. 178 */ 179 int 180 vop_panic(struct vop_generic_args *ap) 181 { 182 183 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 184 } 185 186 /* 187 * vop_std<something> and vop_no<something> are default functions for use by 188 * filesystems that need the "default reasonable" implementation for a 189 * particular operation. 190 * 191 * The documentation for the operations they implement exists (if it exists) 192 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 193 */ 194 195 /* 196 * Default vop for filesystems that do not support name lookup 197 */ 198 static int 199 vop_nolookup(ap) 200 struct vop_lookup_args /* { 201 struct vnode *a_dvp; 202 struct vnode **a_vpp; 203 struct componentname *a_cnp; 204 } */ *ap; 205 { 206 207 *ap->a_vpp = NULL; 208 return (ENOTDIR); 209 } 210 211 /* 212 * vop_norename: 213 * 214 * Handle unlock and reference counting for arguments of vop_rename 215 * for filesystems that do not implement rename operation. 216 */ 217 static int 218 vop_norename(struct vop_rename_args *ap) 219 { 220 221 vop_rename_fail(ap); 222 return (EOPNOTSUPP); 223 } 224 225 /* 226 * vop_nostrategy: 227 * 228 * Strategy routine for VFS devices that have none. 229 * 230 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 231 * routine. Typically this is done for a BIO_READ strategy call. 232 * Typically B_INVAL is assumed to already be clear prior to a write 233 * and should not be cleared manually unless you just made the buffer 234 * invalid. BIO_ERROR should be cleared either way. 235 */ 236 237 static int 238 vop_nostrategy (struct vop_strategy_args *ap) 239 { 240 printf("No strategy for buffer at %p\n", ap->a_bp); 241 vprint("vnode", ap->a_vp); 242 ap->a_bp->b_ioflags |= BIO_ERROR; 243 ap->a_bp->b_error = EOPNOTSUPP; 244 bufdone(ap->a_bp); 245 return (EOPNOTSUPP); 246 } 247 248 static int 249 get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf, 250 int dirbuflen, off_t *off, char **cpos, int *len, 251 int *eofflag, struct thread *td) 252 { 253 int error, reclen; 254 struct uio uio; 255 struct iovec iov; 256 struct dirent *dp; 257 258 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 259 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 260 261 if (*len == 0) { 262 iov.iov_base = dirbuf; 263 iov.iov_len = dirbuflen; 264 265 uio.uio_iov = &iov; 266 uio.uio_iovcnt = 1; 267 uio.uio_offset = *off; 268 uio.uio_resid = dirbuflen; 269 uio.uio_segflg = UIO_SYSSPACE; 270 uio.uio_rw = UIO_READ; 271 uio.uio_td = td; 272 273 *eofflag = 0; 274 275 #ifdef MAC 276 error = mac_vnode_check_readdir(td->td_ucred, vp); 277 if (error == 0) 278 #endif 279 error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag, 280 NULL, NULL); 281 if (error) 282 return (error); 283 284 *off = uio.uio_offset; 285 286 *cpos = dirbuf; 287 *len = (dirbuflen - uio.uio_resid); 288 289 if (*len == 0) 290 return (ENOENT); 291 } 292 293 dp = (struct dirent *)(*cpos); 294 reclen = dp->d_reclen; 295 *dpp = dp; 296 297 /* check for malformed directory.. */ 298 if (reclen < DIRENT_MINSIZE) 299 return (EINVAL); 300 301 *cpos += reclen; 302 *len -= reclen; 303 304 return (0); 305 } 306 307 /* 308 * Check if a named file exists in a given directory vnode. 309 */ 310 static int 311 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 312 { 313 char *dirbuf, *cpos; 314 int error, eofflag, dirbuflen, len, found; 315 off_t off; 316 struct dirent *dp; 317 struct vattr va; 318 319 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 320 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 321 322 found = 0; 323 324 error = VOP_GETATTR(vp, &va, td->td_ucred); 325 if (error) 326 return (found); 327 328 dirbuflen = DEV_BSIZE; 329 if (dirbuflen < va.va_blocksize) 330 dirbuflen = va.va_blocksize; 331 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 332 333 off = 0; 334 len = 0; 335 do { 336 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off, 337 &cpos, &len, &eofflag, td); 338 if (error) 339 goto out; 340 341 if ((dp->d_type != DT_WHT) && 342 !strcmp(dp->d_name, dirname)) { 343 found = 1; 344 goto out; 345 } 346 } while (len > 0 || !eofflag); 347 348 out: 349 free(dirbuf, M_TEMP); 350 return (found); 351 } 352 353 int 354 vop_stdaccess(struct vop_access_args *ap) 355 { 356 357 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | 358 VAPPEND)) == 0, ("invalid bit in accmode")); 359 360 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td)); 361 } 362 363 int 364 vop_stdaccessx(struct vop_accessx_args *ap) 365 { 366 int error; 367 accmode_t accmode = ap->a_accmode; 368 369 error = vfs_unixify_accmode(&accmode); 370 if (error != 0) 371 return (error); 372 373 if (accmode == 0) 374 return (0); 375 376 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 377 } 378 379 /* 380 * Advisory record locking support 381 */ 382 int 383 vop_stdadvlock(struct vop_advlock_args *ap) 384 { 385 struct vnode *vp; 386 struct ucred *cred; 387 struct vattr vattr; 388 int error; 389 390 vp = ap->a_vp; 391 cred = curthread->td_ucred; 392 vn_lock(vp, LK_SHARED | LK_RETRY); 393 error = VOP_GETATTR(vp, &vattr, cred); 394 VOP_UNLOCK(vp, 0); 395 if (error) 396 return (error); 397 398 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size)); 399 } 400 401 int 402 vop_stdadvlockasync(struct vop_advlockasync_args *ap) 403 { 404 struct vnode *vp; 405 struct ucred *cred; 406 struct vattr vattr; 407 int error; 408 409 vp = ap->a_vp; 410 cred = curthread->td_ucred; 411 vn_lock(vp, LK_SHARED | LK_RETRY); 412 error = VOP_GETATTR(vp, &vattr, cred); 413 VOP_UNLOCK(vp, 0); 414 if (error) 415 return (error); 416 417 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 418 } 419 420 int 421 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap) 422 { 423 struct vnode *vp; 424 425 vp = ap->a_vp; 426 lf_purgelocks(vp, &vp->v_lockf); 427 return (0); 428 } 429 430 /* 431 * vop_stdpathconf: 432 * 433 * Standard implementation of POSIX pathconf, to get information about limits 434 * for a filesystem. 435 * Override per filesystem for the case where the filesystem has smaller 436 * limits. 437 */ 438 int 439 vop_stdpathconf(ap) 440 struct vop_pathconf_args /* { 441 struct vnode *a_vp; 442 int a_name; 443 int *a_retval; 444 } */ *ap; 445 { 446 447 switch (ap->a_name) { 448 case _PC_NAME_MAX: 449 *ap->a_retval = NAME_MAX; 450 return (0); 451 case _PC_PATH_MAX: 452 *ap->a_retval = PATH_MAX; 453 return (0); 454 case _PC_LINK_MAX: 455 *ap->a_retval = LINK_MAX; 456 return (0); 457 case _PC_MAX_CANON: 458 *ap->a_retval = MAX_CANON; 459 return (0); 460 case _PC_MAX_INPUT: 461 *ap->a_retval = MAX_INPUT; 462 return (0); 463 case _PC_PIPE_BUF: 464 *ap->a_retval = PIPE_BUF; 465 return (0); 466 case _PC_CHOWN_RESTRICTED: 467 *ap->a_retval = 1; 468 return (0); 469 case _PC_VDISABLE: 470 *ap->a_retval = _POSIX_VDISABLE; 471 return (0); 472 default: 473 return (EINVAL); 474 } 475 /* NOTREACHED */ 476 } 477 478 /* 479 * Standard lock, unlock and islocked functions. 480 */ 481 int 482 vop_stdlock(ap) 483 struct vop_lock1_args /* { 484 struct vnode *a_vp; 485 int a_flags; 486 char *file; 487 int line; 488 } */ *ap; 489 { 490 struct vnode *vp = ap->a_vp; 491 492 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp), 493 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file, 494 ap->a_line)); 495 } 496 497 /* See above. */ 498 int 499 vop_stdunlock(ap) 500 struct vop_unlock_args /* { 501 struct vnode *a_vp; 502 int a_flags; 503 } */ *ap; 504 { 505 struct vnode *vp = ap->a_vp; 506 507 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp))); 508 } 509 510 /* See above. */ 511 int 512 vop_stdislocked(ap) 513 struct vop_islocked_args /* { 514 struct vnode *a_vp; 515 } */ *ap; 516 { 517 518 return (lockstatus(ap->a_vp->v_vnlock)); 519 } 520 521 /* 522 * Return true for select/poll. 523 */ 524 int 525 vop_nopoll(ap) 526 struct vop_poll_args /* { 527 struct vnode *a_vp; 528 int a_events; 529 struct ucred *a_cred; 530 struct thread *a_td; 531 } */ *ap; 532 { 533 534 return (poll_no_poll(ap->a_events)); 535 } 536 537 /* 538 * Implement poll for local filesystems that support it. 539 */ 540 int 541 vop_stdpoll(ap) 542 struct vop_poll_args /* { 543 struct vnode *a_vp; 544 int a_events; 545 struct ucred *a_cred; 546 struct thread *a_td; 547 } */ *ap; 548 { 549 if (ap->a_events & ~POLLSTANDARD) 550 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 551 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 552 } 553 554 /* 555 * Return our mount point, as we will take charge of the writes. 556 */ 557 int 558 vop_stdgetwritemount(ap) 559 struct vop_getwritemount_args /* { 560 struct vnode *a_vp; 561 struct mount **a_mpp; 562 } */ *ap; 563 { 564 struct mount *mp; 565 566 /* 567 * XXX Since this is called unlocked we may be recycled while 568 * attempting to ref the mount. If this is the case or mountpoint 569 * will be set to NULL. We only have to prevent this call from 570 * returning with a ref to an incorrect mountpoint. It is not 571 * harmful to return with a ref to our previous mountpoint. 572 */ 573 mp = ap->a_vp->v_mount; 574 if (mp != NULL) { 575 vfs_ref(mp); 576 if (mp != ap->a_vp->v_mount) { 577 vfs_rel(mp); 578 mp = NULL; 579 } 580 } 581 *(ap->a_mpp) = mp; 582 return (0); 583 } 584 585 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 586 int 587 vop_stdbmap(ap) 588 struct vop_bmap_args /* { 589 struct vnode *a_vp; 590 daddr_t a_bn; 591 struct bufobj **a_bop; 592 daddr_t *a_bnp; 593 int *a_runp; 594 int *a_runb; 595 } */ *ap; 596 { 597 598 if (ap->a_bop != NULL) 599 *ap->a_bop = &ap->a_vp->v_bufobj; 600 if (ap->a_bnp != NULL) 601 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 602 if (ap->a_runp != NULL) 603 *ap->a_runp = 0; 604 if (ap->a_runb != NULL) 605 *ap->a_runb = 0; 606 return (0); 607 } 608 609 int 610 vop_stdfsync(ap) 611 struct vop_fsync_args /* { 612 struct vnode *a_vp; 613 struct ucred *a_cred; 614 int a_waitfor; 615 struct thread *a_td; 616 } */ *ap; 617 { 618 struct vnode *vp = ap->a_vp; 619 struct buf *bp; 620 struct bufobj *bo; 621 struct buf *nbp; 622 int error = 0; 623 int maxretry = 1000; /* large, arbitrarily chosen */ 624 625 bo = &vp->v_bufobj; 626 BO_LOCK(bo); 627 loop1: 628 /* 629 * MARK/SCAN initialization to avoid infinite loops. 630 */ 631 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 632 bp->b_vflags &= ~BV_SCANNED; 633 bp->b_error = 0; 634 } 635 636 /* 637 * Flush all dirty buffers associated with a vnode. 638 */ 639 loop2: 640 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 641 if ((bp->b_vflags & BV_SCANNED) != 0) 642 continue; 643 bp->b_vflags |= BV_SCANNED; 644 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) 645 continue; 646 BO_UNLOCK(bo); 647 KASSERT(bp->b_bufobj == bo, 648 ("bp %p wrong b_bufobj %p should be %p", 649 bp, bp->b_bufobj, bo)); 650 if ((bp->b_flags & B_DELWRI) == 0) 651 panic("fsync: not dirty"); 652 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 653 vfs_bio_awrite(bp); 654 } else { 655 bremfree(bp); 656 bawrite(bp); 657 } 658 BO_LOCK(bo); 659 goto loop2; 660 } 661 662 /* 663 * If synchronous the caller expects us to completely resolve all 664 * dirty buffers in the system. Wait for in-progress I/O to 665 * complete (which could include background bitmap writes), then 666 * retry if dirty blocks still exist. 667 */ 668 if (ap->a_waitfor == MNT_WAIT) { 669 bufobj_wwait(bo, 0, 0); 670 if (bo->bo_dirty.bv_cnt > 0) { 671 /* 672 * If we are unable to write any of these buffers 673 * then we fail now rather than trying endlessly 674 * to write them out. 675 */ 676 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 677 if ((error = bp->b_error) == 0) 678 continue; 679 if (error == 0 && --maxretry >= 0) 680 goto loop1; 681 error = EAGAIN; 682 } 683 } 684 BO_UNLOCK(bo); 685 if (error == EAGAIN) 686 vprint("fsync: giving up on dirty", vp); 687 688 return (error); 689 } 690 691 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 692 int 693 vop_stdgetpages(ap) 694 struct vop_getpages_args /* { 695 struct vnode *a_vp; 696 vm_page_t *a_m; 697 int a_count; 698 int a_reqpage; 699 vm_ooffset_t a_offset; 700 } */ *ap; 701 { 702 703 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 704 ap->a_count, ap->a_reqpage); 705 } 706 707 int 708 vop_stdkqfilter(struct vop_kqfilter_args *ap) 709 { 710 return vfs_kqfilter(ap); 711 } 712 713 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 714 int 715 vop_stdputpages(ap) 716 struct vop_putpages_args /* { 717 struct vnode *a_vp; 718 vm_page_t *a_m; 719 int a_count; 720 int a_sync; 721 int *a_rtvals; 722 vm_ooffset_t a_offset; 723 } */ *ap; 724 { 725 726 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 727 ap->a_sync, ap->a_rtvals); 728 } 729 730 int 731 vop_stdvptofh(struct vop_vptofh_args *ap) 732 { 733 return (EOPNOTSUPP); 734 } 735 736 int 737 vop_stdvptocnp(struct vop_vptocnp_args *ap) 738 { 739 struct vnode *vp = ap->a_vp; 740 struct vnode **dvp = ap->a_vpp; 741 struct ucred *cred = ap->a_cred; 742 char *buf = ap->a_buf; 743 int *buflen = ap->a_buflen; 744 char *dirbuf, *cpos; 745 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 746 off_t off; 747 ino_t fileno; 748 struct vattr va; 749 struct nameidata nd; 750 struct thread *td; 751 struct dirent *dp; 752 struct vnode *mvp; 753 754 i = *buflen; 755 error = 0; 756 covered = 0; 757 td = curthread; 758 759 if (vp->v_type != VDIR) 760 return (ENOENT); 761 762 error = VOP_GETATTR(vp, &va, cred); 763 if (error) 764 return (error); 765 766 VREF(vp); 767 locked = VOP_ISLOCKED(vp); 768 VOP_UNLOCK(vp, 0); 769 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 770 "..", vp, td); 771 flags = FREAD; 772 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 773 if (error) { 774 vn_lock(vp, locked | LK_RETRY); 775 return (error); 776 } 777 NDFREE(&nd, NDF_ONLY_PNBUF); 778 779 mvp = *dvp = nd.ni_vp; 780 781 if (vp->v_mount != (*dvp)->v_mount && 782 ((*dvp)->v_vflag & VV_ROOT) && 783 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 784 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 785 VREF(mvp); 786 VOP_UNLOCK(mvp, 0); 787 vn_close(mvp, FREAD, cred, td); 788 VREF(*dvp); 789 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 790 covered = 1; 791 } 792 793 fileno = va.va_fileid; 794 795 dirbuflen = DEV_BSIZE; 796 if (dirbuflen < va.va_blocksize) 797 dirbuflen = va.va_blocksize; 798 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 799 800 if ((*dvp)->v_type != VDIR) { 801 error = ENOENT; 802 goto out; 803 } 804 805 off = 0; 806 len = 0; 807 do { 808 /* call VOP_READDIR of parent */ 809 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 810 &cpos, &len, &eofflag, td); 811 if (error) 812 goto out; 813 814 if ((dp->d_type != DT_WHT) && 815 (dp->d_fileno == fileno)) { 816 if (covered) { 817 VOP_UNLOCK(*dvp, 0); 818 vn_lock(mvp, LK_EXCLUSIVE | LK_RETRY); 819 if (dirent_exists(mvp, dp->d_name, td)) { 820 error = ENOENT; 821 VOP_UNLOCK(mvp, 0); 822 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 823 goto out; 824 } 825 VOP_UNLOCK(mvp, 0); 826 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 827 } 828 i -= dp->d_namlen; 829 830 if (i < 0) { 831 error = ENOMEM; 832 goto out; 833 } 834 bcopy(dp->d_name, buf + i, dp->d_namlen); 835 error = 0; 836 goto out; 837 } 838 } while (len > 0 || !eofflag); 839 error = ENOENT; 840 841 out: 842 free(dirbuf, M_TEMP); 843 if (!error) { 844 *buflen = i; 845 vhold(*dvp); 846 } 847 if (covered) { 848 vput(*dvp); 849 vrele(mvp); 850 } else { 851 VOP_UNLOCK(mvp, 0); 852 vn_close(mvp, FREAD, cred, td); 853 } 854 vn_lock(vp, locked | LK_RETRY); 855 return (error); 856 } 857 858 /* 859 * vfs default ops 860 * used to fill the vfs function table to get reasonable default return values. 861 */ 862 int 863 vfs_stdroot (mp, flags, vpp) 864 struct mount *mp; 865 int flags; 866 struct vnode **vpp; 867 { 868 869 return (EOPNOTSUPP); 870 } 871 872 int 873 vfs_stdstatfs (mp, sbp) 874 struct mount *mp; 875 struct statfs *sbp; 876 { 877 878 return (EOPNOTSUPP); 879 } 880 881 int 882 vfs_stdquotactl (mp, cmds, uid, arg) 883 struct mount *mp; 884 int cmds; 885 uid_t uid; 886 void *arg; 887 { 888 889 return (EOPNOTSUPP); 890 } 891 892 int 893 vfs_stdsync(mp, waitfor) 894 struct mount *mp; 895 int waitfor; 896 { 897 struct vnode *vp, *mvp; 898 struct thread *td; 899 int error, lockreq, allerror = 0; 900 901 td = curthread; 902 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 903 if (waitfor != MNT_WAIT) 904 lockreq |= LK_NOWAIT; 905 /* 906 * Force stale buffer cache information to be flushed. 907 */ 908 MNT_ILOCK(mp); 909 loop: 910 MNT_VNODE_FOREACH(vp, mp, mvp) { 911 /* bv_cnt is an acceptable race here. */ 912 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) 913 continue; 914 VI_LOCK(vp); 915 MNT_IUNLOCK(mp); 916 if ((error = vget(vp, lockreq, td)) != 0) { 917 MNT_ILOCK(mp); 918 if (error == ENOENT) { 919 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); 920 goto loop; 921 } 922 continue; 923 } 924 error = VOP_FSYNC(vp, waitfor, td); 925 if (error) 926 allerror = error; 927 vput(vp); 928 MNT_ILOCK(mp); 929 } 930 MNT_IUNLOCK(mp); 931 return (allerror); 932 } 933 934 int 935 vfs_stdnosync (mp, waitfor) 936 struct mount *mp; 937 int waitfor; 938 { 939 940 return (0); 941 } 942 943 int 944 vfs_stdvget (mp, ino, flags, vpp) 945 struct mount *mp; 946 ino_t ino; 947 int flags; 948 struct vnode **vpp; 949 { 950 951 return (EOPNOTSUPP); 952 } 953 954 int 955 vfs_stdfhtovp (mp, fhp, vpp) 956 struct mount *mp; 957 struct fid *fhp; 958 struct vnode **vpp; 959 { 960 961 return (EOPNOTSUPP); 962 } 963 964 int 965 vfs_stdinit (vfsp) 966 struct vfsconf *vfsp; 967 { 968 969 return (0); 970 } 971 972 int 973 vfs_stduninit (vfsp) 974 struct vfsconf *vfsp; 975 { 976 977 return(0); 978 } 979 980 int 981 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 982 struct mount *mp; 983 int cmd; 984 struct vnode *filename_vp; 985 int attrnamespace; 986 const char *attrname; 987 { 988 989 if (filename_vp != NULL) 990 VOP_UNLOCK(filename_vp, 0); 991 return (EOPNOTSUPP); 992 } 993 994 int 995 vfs_stdsysctl(mp, op, req) 996 struct mount *mp; 997 fsctlop_t op; 998 struct sysctl_req *req; 999 { 1000 1001 return (EOPNOTSUPP); 1002 } 1003 1004 /* end of vfs default ops */ 1005