Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_default.c
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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: releng/8.0/sys/kern/vfs_default.c 194601 2009-06-21 19:21:01Z kib $"); 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 */ 87 88 struct vop_vector default_vnodeops = { 89 .vop_default = NULL, 90 .vop_bypass = VOP_EOPNOTSUPP, 91 92 .vop_accessx = vop_stdaccessx, 93 .vop_advlock = vop_stdadvlock, 94 .vop_advlockasync = vop_stdadvlockasync, 95 .vop_bmap = vop_stdbmap, 96 .vop_close = VOP_NULL, 97 .vop_fsync = VOP_NULL, 98 .vop_getpages = vop_stdgetpages, 99 .vop_getwritemount = vop_stdgetwritemount, 100 .vop_inactive = VOP_NULL, 101 .vop_ioctl = VOP_ENOTTY, 102 .vop_kqfilter = vop_stdkqfilter, 103 .vop_islocked = vop_stdislocked, 104 .vop_lock1 = vop_stdlock, 105 .vop_lookup = vop_nolookup, 106 .vop_open = VOP_NULL, 107 .vop_pathconf = VOP_EINVAL, 108 .vop_poll = vop_nopoll, 109 .vop_putpages = vop_stdputpages, 110 .vop_readlink = VOP_EINVAL, 111 .vop_revoke = VOP_PANIC, 112 .vop_strategy = vop_nostrategy, 113 .vop_unlock = vop_stdunlock, 114 .vop_vptocnp = vop_stdvptocnp, 115 .vop_vptofh = vop_stdvptofh, 116 }; 117 118 /* 119 * Series of placeholder functions for various error returns for 120 * VOPs. 121 */ 122 123 int 124 vop_eopnotsupp(struct vop_generic_args *ap) 125 { 126 /* 127 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 128 */ 129 130 return (EOPNOTSUPP); 131 } 132 133 int 134 vop_ebadf(struct vop_generic_args *ap) 135 { 136 137 return (EBADF); 138 } 139 140 int 141 vop_enotty(struct vop_generic_args *ap) 142 { 143 144 return (ENOTTY); 145 } 146 147 int 148 vop_einval(struct vop_generic_args *ap) 149 { 150 151 return (EINVAL); 152 } 153 154 int 155 vop_enoent(struct vop_generic_args *ap) 156 { 157 158 return (ENOENT); 159 } 160 161 int 162 vop_null(struct vop_generic_args *ap) 163 { 164 165 return (0); 166 } 167 168 /* 169 * Helper function to panic on some bad VOPs in some filesystems. 170 */ 171 int 172 vop_panic(struct vop_generic_args *ap) 173 { 174 175 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 176 } 177 178 /* 179 * vop_std<something> and vop_no<something> are default functions for use by 180 * filesystems that need the "default reasonable" implementation for a 181 * particular operation. 182 * 183 * The documentation for the operations they implement exists (if it exists) 184 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 185 */ 186 187 /* 188 * Default vop for filesystems that do not support name lookup 189 */ 190 static int 191 vop_nolookup(ap) 192 struct vop_lookup_args /* { 193 struct vnode *a_dvp; 194 struct vnode **a_vpp; 195 struct componentname *a_cnp; 196 } */ *ap; 197 { 198 199 *ap->a_vpp = NULL; 200 return (ENOTDIR); 201 } 202 203 /* 204 * vop_nostrategy: 205 * 206 * Strategy routine for VFS devices that have none. 207 * 208 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 209 * routine. Typically this is done for a BIO_READ strategy call. 210 * Typically B_INVAL is assumed to already be clear prior to a write 211 * and should not be cleared manually unless you just made the buffer 212 * invalid. BIO_ERROR should be cleared either way. 213 */ 214 215 static int 216 vop_nostrategy (struct vop_strategy_args *ap) 217 { 218 printf("No strategy for buffer at %p\n", ap->a_bp); 219 vprint("vnode", ap->a_vp); 220 ap->a_bp->b_ioflags |= BIO_ERROR; 221 ap->a_bp->b_error = EOPNOTSUPP; 222 bufdone(ap->a_bp); 223 return (EOPNOTSUPP); 224 } 225 226 static int 227 get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf, 228 int dirbuflen, off_t *off, char **cpos, int *len, 229 int *eofflag, struct thread *td) 230 { 231 int error, reclen; 232 struct uio uio; 233 struct iovec iov; 234 struct dirent *dp; 235 236 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 237 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 238 239 if (*len == 0) { 240 iov.iov_base = dirbuf; 241 iov.iov_len = dirbuflen; 242 243 uio.uio_iov = &iov; 244 uio.uio_iovcnt = 1; 245 uio.uio_offset = *off; 246 uio.uio_resid = dirbuflen; 247 uio.uio_segflg = UIO_SYSSPACE; 248 uio.uio_rw = UIO_READ; 249 uio.uio_td = td; 250 251 *eofflag = 0; 252 253 #ifdef MAC 254 error = mac_vnode_check_readdir(td->td_ucred, vp); 255 if (error == 0) 256 #endif 257 error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag, 258 NULL, NULL); 259 if (error) 260 return (error); 261 262 *off = uio.uio_offset; 263 264 *cpos = dirbuf; 265 *len = (dirbuflen - uio.uio_resid); 266 } 267 268 dp = (struct dirent *)(*cpos); 269 reclen = dp->d_reclen; 270 *dpp = dp; 271 272 /* check for malformed directory.. */ 273 if (reclen < DIRENT_MINSIZE) 274 return (EINVAL); 275 276 *cpos += reclen; 277 *len -= reclen; 278 279 return (0); 280 } 281 282 /* 283 * Check if a named file exists in a given directory vnode. 284 */ 285 static int 286 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 287 { 288 char *dirbuf, *cpos; 289 int error, eofflag, dirbuflen, len, found; 290 off_t off; 291 struct dirent *dp; 292 struct vattr va; 293 294 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 295 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 296 297 found = 0; 298 299 error = VOP_GETATTR(vp, &va, td->td_ucred); 300 if (error) 301 return (found); 302 303 dirbuflen = DEV_BSIZE; 304 if (dirbuflen < va.va_blocksize) 305 dirbuflen = va.va_blocksize; 306 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 307 308 off = 0; 309 len = 0; 310 do { 311 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off, 312 &cpos, &len, &eofflag, td); 313 if (error) 314 goto out; 315 316 if ((dp->d_type != DT_WHT) && 317 !strcmp(dp->d_name, dirname)) { 318 found = 1; 319 goto out; 320 } 321 } while (len > 0 || !eofflag); 322 323 out: 324 free(dirbuf, M_TEMP); 325 return (found); 326 } 327 328 int 329 vop_stdaccessx(struct vop_accessx_args *ap) 330 { 331 int error; 332 accmode_t accmode = ap->a_accmode; 333 334 error = vfs_unixify_accmode(&accmode); 335 if (error != 0) 336 return (error); 337 338 if (accmode == 0) 339 return (0); 340 341 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 342 } 343 344 /* 345 * Advisory record locking support 346 */ 347 int 348 vop_stdadvlock(struct vop_advlock_args *ap) 349 { 350 struct vnode *vp; 351 struct ucred *cred; 352 struct vattr vattr; 353 int error; 354 355 vp = ap->a_vp; 356 cred = curthread->td_ucred; 357 vn_lock(vp, LK_SHARED | LK_RETRY); 358 error = VOP_GETATTR(vp, &vattr, cred); 359 VOP_UNLOCK(vp, 0); 360 if (error) 361 return (error); 362 363 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size)); 364 } 365 366 int 367 vop_stdadvlockasync(struct vop_advlockasync_args *ap) 368 { 369 struct vnode *vp; 370 struct ucred *cred; 371 struct vattr vattr; 372 int error; 373 374 vp = ap->a_vp; 375 cred = curthread->td_ucred; 376 vn_lock(vp, LK_SHARED | LK_RETRY); 377 error = VOP_GETATTR(vp, &vattr, cred); 378 VOP_UNLOCK(vp, 0); 379 if (error) 380 return (error); 381 382 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 383 } 384 385 /* 386 * vop_stdpathconf: 387 * 388 * Standard implementation of POSIX pathconf, to get information about limits 389 * for a filesystem. 390 * Override per filesystem for the case where the filesystem has smaller 391 * limits. 392 */ 393 int 394 vop_stdpathconf(ap) 395 struct vop_pathconf_args /* { 396 struct vnode *a_vp; 397 int a_name; 398 int *a_retval; 399 } */ *ap; 400 { 401 402 switch (ap->a_name) { 403 case _PC_NAME_MAX: 404 *ap->a_retval = NAME_MAX; 405 return (0); 406 case _PC_PATH_MAX: 407 *ap->a_retval = PATH_MAX; 408 return (0); 409 case _PC_LINK_MAX: 410 *ap->a_retval = LINK_MAX; 411 return (0); 412 case _PC_MAX_CANON: 413 *ap->a_retval = MAX_CANON; 414 return (0); 415 case _PC_MAX_INPUT: 416 *ap->a_retval = MAX_INPUT; 417 return (0); 418 case _PC_PIPE_BUF: 419 *ap->a_retval = PIPE_BUF; 420 return (0); 421 case _PC_CHOWN_RESTRICTED: 422 *ap->a_retval = 1; 423 return (0); 424 case _PC_VDISABLE: 425 *ap->a_retval = _POSIX_VDISABLE; 426 return (0); 427 default: 428 return (EINVAL); 429 } 430 /* NOTREACHED */ 431 } 432 433 /* 434 * Standard lock, unlock and islocked functions. 435 */ 436 int 437 vop_stdlock(ap) 438 struct vop_lock1_args /* { 439 struct vnode *a_vp; 440 int a_flags; 441 char *file; 442 int line; 443 } */ *ap; 444 { 445 struct vnode *vp = ap->a_vp; 446 447 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp), 448 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file, 449 ap->a_line)); 450 } 451 452 /* See above. */ 453 int 454 vop_stdunlock(ap) 455 struct vop_unlock_args /* { 456 struct vnode *a_vp; 457 int a_flags; 458 } */ *ap; 459 { 460 struct vnode *vp = ap->a_vp; 461 462 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp))); 463 } 464 465 /* See above. */ 466 int 467 vop_stdislocked(ap) 468 struct vop_islocked_args /* { 469 struct vnode *a_vp; 470 } */ *ap; 471 { 472 473 return (lockstatus(ap->a_vp->v_vnlock)); 474 } 475 476 /* 477 * Return true for select/poll. 478 */ 479 int 480 vop_nopoll(ap) 481 struct vop_poll_args /* { 482 struct vnode *a_vp; 483 int a_events; 484 struct ucred *a_cred; 485 struct thread *a_td; 486 } */ *ap; 487 { 488 489 return (poll_no_poll(ap->a_events)); 490 } 491 492 /* 493 * Implement poll for local filesystems that support it. 494 */ 495 int 496 vop_stdpoll(ap) 497 struct vop_poll_args /* { 498 struct vnode *a_vp; 499 int a_events; 500 struct ucred *a_cred; 501 struct thread *a_td; 502 } */ *ap; 503 { 504 if (ap->a_events & ~POLLSTANDARD) 505 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 506 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 507 } 508 509 /* 510 * Return our mount point, as we will take charge of the writes. 511 */ 512 int 513 vop_stdgetwritemount(ap) 514 struct vop_getwritemount_args /* { 515 struct vnode *a_vp; 516 struct mount **a_mpp; 517 } */ *ap; 518 { 519 struct mount *mp; 520 521 /* 522 * XXX Since this is called unlocked we may be recycled while 523 * attempting to ref the mount. If this is the case or mountpoint 524 * will be set to NULL. We only have to prevent this call from 525 * returning with a ref to an incorrect mountpoint. It is not 526 * harmful to return with a ref to our previous mountpoint. 527 */ 528 mp = ap->a_vp->v_mount; 529 if (mp != NULL) { 530 vfs_ref(mp); 531 if (mp != ap->a_vp->v_mount) { 532 vfs_rel(mp); 533 mp = NULL; 534 } 535 } 536 *(ap->a_mpp) = mp; 537 return (0); 538 } 539 540 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 541 int 542 vop_stdbmap(ap) 543 struct vop_bmap_args /* { 544 struct vnode *a_vp; 545 daddr_t a_bn; 546 struct bufobj **a_bop; 547 daddr_t *a_bnp; 548 int *a_runp; 549 int *a_runb; 550 } */ *ap; 551 { 552 553 if (ap->a_bop != NULL) 554 *ap->a_bop = &ap->a_vp->v_bufobj; 555 if (ap->a_bnp != NULL) 556 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 557 if (ap->a_runp != NULL) 558 *ap->a_runp = 0; 559 if (ap->a_runb != NULL) 560 *ap->a_runb = 0; 561 return (0); 562 } 563 564 int 565 vop_stdfsync(ap) 566 struct vop_fsync_args /* { 567 struct vnode *a_vp; 568 struct ucred *a_cred; 569 int a_waitfor; 570 struct thread *a_td; 571 } */ *ap; 572 { 573 struct vnode *vp = ap->a_vp; 574 struct buf *bp; 575 struct bufobj *bo; 576 struct buf *nbp; 577 int error = 0; 578 int maxretry = 1000; /* large, arbitrarily chosen */ 579 580 bo = &vp->v_bufobj; 581 BO_LOCK(bo); 582 loop1: 583 /* 584 * MARK/SCAN initialization to avoid infinite loops. 585 */ 586 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 587 bp->b_vflags &= ~BV_SCANNED; 588 bp->b_error = 0; 589 } 590 591 /* 592 * Flush all dirty buffers associated with a vnode. 593 */ 594 loop2: 595 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 596 if ((bp->b_vflags & BV_SCANNED) != 0) 597 continue; 598 bp->b_vflags |= BV_SCANNED; 599 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) 600 continue; 601 BO_UNLOCK(bo); 602 KASSERT(bp->b_bufobj == bo, 603 ("bp %p wrong b_bufobj %p should be %p", 604 bp, bp->b_bufobj, bo)); 605 if ((bp->b_flags & B_DELWRI) == 0) 606 panic("fsync: not dirty"); 607 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 608 vfs_bio_awrite(bp); 609 } else { 610 bremfree(bp); 611 bawrite(bp); 612 } 613 BO_LOCK(bo); 614 goto loop2; 615 } 616 617 /* 618 * If synchronous the caller expects us to completely resolve all 619 * dirty buffers in the system. Wait for in-progress I/O to 620 * complete (which could include background bitmap writes), then 621 * retry if dirty blocks still exist. 622 */ 623 if (ap->a_waitfor == MNT_WAIT) { 624 bufobj_wwait(bo, 0, 0); 625 if (bo->bo_dirty.bv_cnt > 0) { 626 /* 627 * If we are unable to write any of these buffers 628 * then we fail now rather than trying endlessly 629 * to write them out. 630 */ 631 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 632 if ((error = bp->b_error) == 0) 633 continue; 634 if (error == 0 && --maxretry >= 0) 635 goto loop1; 636 error = EAGAIN; 637 } 638 } 639 BO_UNLOCK(bo); 640 if (error == EAGAIN) 641 vprint("fsync: giving up on dirty", vp); 642 643 return (error); 644 } 645 646 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 647 int 648 vop_stdgetpages(ap) 649 struct vop_getpages_args /* { 650 struct vnode *a_vp; 651 vm_page_t *a_m; 652 int a_count; 653 int a_reqpage; 654 vm_ooffset_t a_offset; 655 } */ *ap; 656 { 657 658 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 659 ap->a_count, ap->a_reqpage); 660 } 661 662 int 663 vop_stdkqfilter(struct vop_kqfilter_args *ap) 664 { 665 return vfs_kqfilter(ap); 666 } 667 668 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 669 int 670 vop_stdputpages(ap) 671 struct vop_putpages_args /* { 672 struct vnode *a_vp; 673 vm_page_t *a_m; 674 int a_count; 675 int a_sync; 676 int *a_rtvals; 677 vm_ooffset_t a_offset; 678 } */ *ap; 679 { 680 681 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 682 ap->a_sync, ap->a_rtvals); 683 } 684 685 int 686 vop_stdvptofh(struct vop_vptofh_args *ap) 687 { 688 return (EOPNOTSUPP); 689 } 690 691 int 692 vop_stdvptocnp(struct vop_vptocnp_args *ap) 693 { 694 struct vnode *vp = ap->a_vp; 695 struct vnode **dvp = ap->a_vpp; 696 struct ucred *cred = ap->a_cred; 697 char *buf = ap->a_buf; 698 int *buflen = ap->a_buflen; 699 char *dirbuf, *cpos; 700 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 701 off_t off; 702 ino_t fileno; 703 struct vattr va; 704 struct nameidata nd; 705 struct thread *td; 706 struct dirent *dp; 707 struct vnode *mvp; 708 709 i = *buflen; 710 error = 0; 711 covered = 0; 712 td = curthread; 713 714 if (vp->v_type != VDIR) 715 return (ENOENT); 716 717 error = VOP_GETATTR(vp, &va, cred); 718 if (error) 719 return (error); 720 721 VREF(vp); 722 locked = VOP_ISLOCKED(vp); 723 VOP_UNLOCK(vp, 0); 724 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 725 "..", vp, td); 726 flags = FREAD; 727 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 728 if (error) { 729 vn_lock(vp, locked | LK_RETRY); 730 return (error); 731 } 732 NDFREE(&nd, NDF_ONLY_PNBUF); 733 734 mvp = *dvp = nd.ni_vp; 735 736 if (vp->v_mount != (*dvp)->v_mount && 737 ((*dvp)->v_vflag & VV_ROOT) && 738 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 739 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 740 VREF(mvp); 741 VOP_UNLOCK(mvp, 0); 742 vn_close(mvp, FREAD, cred, td); 743 VREF(*dvp); 744 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 745 covered = 1; 746 } 747 748 fileno = va.va_fileid; 749 750 dirbuflen = DEV_BSIZE; 751 if (dirbuflen < va.va_blocksize) 752 dirbuflen = va.va_blocksize; 753 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 754 755 if ((*dvp)->v_type != VDIR) { 756 error = ENOENT; 757 goto out; 758 } 759 760 off = 0; 761 len = 0; 762 do { 763 /* call VOP_READDIR of parent */ 764 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 765 &cpos, &len, &eofflag, td); 766 if (error) 767 goto out; 768 769 if ((dp->d_type != DT_WHT) && 770 (dp->d_fileno == fileno)) { 771 if (covered) { 772 VOP_UNLOCK(*dvp, 0); 773 vn_lock(mvp, LK_EXCLUSIVE | LK_RETRY); 774 if (dirent_exists(mvp, dp->d_name, td)) { 775 error = ENOENT; 776 VOP_UNLOCK(mvp, 0); 777 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 778 goto out; 779 } 780 VOP_UNLOCK(mvp, 0); 781 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 782 } 783 i -= dp->d_namlen; 784 785 if (i < 0) { 786 error = ENOMEM; 787 goto out; 788 } 789 bcopy(dp->d_name, buf + i, dp->d_namlen); 790 error = 0; 791 goto out; 792 } 793 } while (len > 0 || !eofflag); 794 error = ENOENT; 795 796 out: 797 free(dirbuf, M_TEMP); 798 if (!error) { 799 *buflen = i; 800 vhold(*dvp); 801 } 802 if (covered) { 803 vput(*dvp); 804 vrele(mvp); 805 } else { 806 VOP_UNLOCK(mvp, 0); 807 vn_close(mvp, FREAD, cred, td); 808 } 809 vn_lock(vp, locked | LK_RETRY); 810 return (error); 811 } 812 813 /* 814 * vfs default ops 815 * used to fill the vfs function table to get reasonable default return values. 816 */ 817 int 818 vfs_stdroot (mp, flags, vpp) 819 struct mount *mp; 820 int flags; 821 struct vnode **vpp; 822 { 823 824 return (EOPNOTSUPP); 825 } 826 827 int 828 vfs_stdstatfs (mp, sbp) 829 struct mount *mp; 830 struct statfs *sbp; 831 { 832 833 return (EOPNOTSUPP); 834 } 835 836 int 837 vfs_stdquotactl (mp, cmds, uid, arg) 838 struct mount *mp; 839 int cmds; 840 uid_t uid; 841 void *arg; 842 { 843 844 return (EOPNOTSUPP); 845 } 846 847 int 848 vfs_stdsync(mp, waitfor) 849 struct mount *mp; 850 int waitfor; 851 { 852 struct vnode *vp, *mvp; 853 struct thread *td; 854 int error, lockreq, allerror = 0; 855 856 td = curthread; 857 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 858 if (waitfor != MNT_WAIT) 859 lockreq |= LK_NOWAIT; 860 /* 861 * Force stale buffer cache information to be flushed. 862 */ 863 MNT_ILOCK(mp); 864 loop: 865 MNT_VNODE_FOREACH(vp, mp, mvp) { 866 /* bv_cnt is an acceptable race here. */ 867 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) 868 continue; 869 VI_LOCK(vp); 870 MNT_IUNLOCK(mp); 871 if ((error = vget(vp, lockreq, td)) != 0) { 872 MNT_ILOCK(mp); 873 if (error == ENOENT) { 874 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); 875 goto loop; 876 } 877 continue; 878 } 879 error = VOP_FSYNC(vp, waitfor, td); 880 if (error) 881 allerror = error; 882 883 /* Do not turn this into vput. td is not always curthread. */ 884 VOP_UNLOCK(vp, 0); 885 vrele(vp); 886 MNT_ILOCK(mp); 887 } 888 MNT_IUNLOCK(mp); 889 return (allerror); 890 } 891 892 int 893 vfs_stdnosync (mp, waitfor) 894 struct mount *mp; 895 int waitfor; 896 { 897 898 return (0); 899 } 900 901 int 902 vfs_stdvget (mp, ino, flags, vpp) 903 struct mount *mp; 904 ino_t ino; 905 int flags; 906 struct vnode **vpp; 907 { 908 909 return (EOPNOTSUPP); 910 } 911 912 int 913 vfs_stdfhtovp (mp, fhp, vpp) 914 struct mount *mp; 915 struct fid *fhp; 916 struct vnode **vpp; 917 { 918 919 return (EOPNOTSUPP); 920 } 921 922 int 923 vfs_stdinit (vfsp) 924 struct vfsconf *vfsp; 925 { 926 927 return (0); 928 } 929 930 int 931 vfs_stduninit (vfsp) 932 struct vfsconf *vfsp; 933 { 934 935 return(0); 936 } 937 938 int 939 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 940 struct mount *mp; 941 int cmd; 942 struct vnode *filename_vp; 943 int attrnamespace; 944 const char *attrname; 945 { 946 947 if (filename_vp != NULL) 948 VOP_UNLOCK(filename_vp, 0); 949 return (EOPNOTSUPP); 950 } 951 952 int 953 vfs_stdsysctl(mp, op, req) 954 struct mount *mp; 955 fsctlop_t op; 956 struct sysctl_req *req; 957 { 958 959 return (EOPNOTSUPP); 960 } 961 962 /* end of vfs default ops */
Cache object: 7cc94c79885f0984d3909f6dfd16177e
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