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 } 289 290 dp = (struct dirent *)(*cpos); 291 reclen = dp->d_reclen; 292 *dpp = dp; 293 294 /* check for malformed directory.. */ 295 if (reclen < DIRENT_MINSIZE) 296 return (EINVAL); 297 298 *cpos += reclen; 299 *len -= reclen; 300 301 return (0); 302 } 303 304 /* 305 * Check if a named file exists in a given directory vnode. 306 */ 307 static int 308 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 309 { 310 char *dirbuf, *cpos; 311 int error, eofflag, dirbuflen, len, found; 312 off_t off; 313 struct dirent *dp; 314 struct vattr va; 315 316 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 317 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 318 319 found = 0; 320 321 error = VOP_GETATTR(vp, &va, td->td_ucred); 322 if (error) 323 return (found); 324 325 dirbuflen = DEV_BSIZE; 326 if (dirbuflen < va.va_blocksize) 327 dirbuflen = va.va_blocksize; 328 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 329 330 off = 0; 331 len = 0; 332 do { 333 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off, 334 &cpos, &len, &eofflag, td); 335 if (error) 336 goto out; 337 338 if ((dp->d_type != DT_WHT) && 339 !strcmp(dp->d_name, dirname)) { 340 found = 1; 341 goto out; 342 } 343 } while (len > 0 || !eofflag); 344 345 out: 346 free(dirbuf, M_TEMP); 347 return (found); 348 } 349 350 int 351 vop_stdaccess(struct vop_access_args *ap) 352 { 353 354 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | 355 VAPPEND)) == 0, ("invalid bit in accmode")); 356 357 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td)); 358 } 359 360 int 361 vop_stdaccessx(struct vop_accessx_args *ap) 362 { 363 int error; 364 accmode_t accmode = ap->a_accmode; 365 366 error = vfs_unixify_accmode(&accmode); 367 if (error != 0) 368 return (error); 369 370 if (accmode == 0) 371 return (0); 372 373 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 374 } 375 376 /* 377 * Advisory record locking support 378 */ 379 int 380 vop_stdadvlock(struct vop_advlock_args *ap) 381 { 382 struct vnode *vp; 383 struct ucred *cred; 384 struct vattr vattr; 385 int error; 386 387 vp = ap->a_vp; 388 cred = curthread->td_ucred; 389 vn_lock(vp, LK_SHARED | LK_RETRY); 390 error = VOP_GETATTR(vp, &vattr, cred); 391 VOP_UNLOCK(vp, 0); 392 if (error) 393 return (error); 394 395 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size)); 396 } 397 398 int 399 vop_stdadvlockasync(struct vop_advlockasync_args *ap) 400 { 401 struct vnode *vp; 402 struct ucred *cred; 403 struct vattr vattr; 404 int error; 405 406 vp = ap->a_vp; 407 cred = curthread->td_ucred; 408 vn_lock(vp, LK_SHARED | LK_RETRY); 409 error = VOP_GETATTR(vp, &vattr, cred); 410 VOP_UNLOCK(vp, 0); 411 if (error) 412 return (error); 413 414 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 415 } 416 417 int 418 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap) 419 { 420 struct vnode *vp; 421 422 vp = ap->a_vp; 423 lf_purgelocks(vp, &vp->v_lockf); 424 return (0); 425 } 426 427 /* 428 * vop_stdpathconf: 429 * 430 * Standard implementation of POSIX pathconf, to get information about limits 431 * for a filesystem. 432 * Override per filesystem for the case where the filesystem has smaller 433 * limits. 434 */ 435 int 436 vop_stdpathconf(ap) 437 struct vop_pathconf_args /* { 438 struct vnode *a_vp; 439 int a_name; 440 int *a_retval; 441 } */ *ap; 442 { 443 444 switch (ap->a_name) { 445 case _PC_NAME_MAX: 446 *ap->a_retval = NAME_MAX; 447 return (0); 448 case _PC_PATH_MAX: 449 *ap->a_retval = PATH_MAX; 450 return (0); 451 case _PC_LINK_MAX: 452 *ap->a_retval = LINK_MAX; 453 return (0); 454 case _PC_MAX_CANON: 455 *ap->a_retval = MAX_CANON; 456 return (0); 457 case _PC_MAX_INPUT: 458 *ap->a_retval = MAX_INPUT; 459 return (0); 460 case _PC_PIPE_BUF: 461 *ap->a_retval = PIPE_BUF; 462 return (0); 463 case _PC_CHOWN_RESTRICTED: 464 *ap->a_retval = 1; 465 return (0); 466 case _PC_VDISABLE: 467 *ap->a_retval = _POSIX_VDISABLE; 468 return (0); 469 default: 470 return (EINVAL); 471 } 472 /* NOTREACHED */ 473 } 474 475 /* 476 * Standard lock, unlock and islocked functions. 477 */ 478 int 479 vop_stdlock(ap) 480 struct vop_lock1_args /* { 481 struct vnode *a_vp; 482 int a_flags; 483 char *file; 484 int line; 485 } */ *ap; 486 { 487 struct vnode *vp = ap->a_vp; 488 489 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp), 490 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file, 491 ap->a_line)); 492 } 493 494 /* See above. */ 495 int 496 vop_stdunlock(ap) 497 struct vop_unlock_args /* { 498 struct vnode *a_vp; 499 int a_flags; 500 } */ *ap; 501 { 502 struct vnode *vp = ap->a_vp; 503 504 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp))); 505 } 506 507 /* See above. */ 508 int 509 vop_stdislocked(ap) 510 struct vop_islocked_args /* { 511 struct vnode *a_vp; 512 } */ *ap; 513 { 514 515 return (lockstatus(ap->a_vp->v_vnlock)); 516 } 517 518 /* 519 * Return true for select/poll. 520 */ 521 int 522 vop_nopoll(ap) 523 struct vop_poll_args /* { 524 struct vnode *a_vp; 525 int a_events; 526 struct ucred *a_cred; 527 struct thread *a_td; 528 } */ *ap; 529 { 530 531 return (poll_no_poll(ap->a_events)); 532 } 533 534 /* 535 * Implement poll for local filesystems that support it. 536 */ 537 int 538 vop_stdpoll(ap) 539 struct vop_poll_args /* { 540 struct vnode *a_vp; 541 int a_events; 542 struct ucred *a_cred; 543 struct thread *a_td; 544 } */ *ap; 545 { 546 if (ap->a_events & ~POLLSTANDARD) 547 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 548 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 549 } 550 551 /* 552 * Return our mount point, as we will take charge of the writes. 553 */ 554 int 555 vop_stdgetwritemount(ap) 556 struct vop_getwritemount_args /* { 557 struct vnode *a_vp; 558 struct mount **a_mpp; 559 } */ *ap; 560 { 561 struct mount *mp; 562 563 /* 564 * XXX Since this is called unlocked we may be recycled while 565 * attempting to ref the mount. If this is the case or mountpoint 566 * will be set to NULL. We only have to prevent this call from 567 * returning with a ref to an incorrect mountpoint. It is not 568 * harmful to return with a ref to our previous mountpoint. 569 */ 570 mp = ap->a_vp->v_mount; 571 if (mp != NULL) { 572 vfs_ref(mp); 573 if (mp != ap->a_vp->v_mount) { 574 vfs_rel(mp); 575 mp = NULL; 576 } 577 } 578 *(ap->a_mpp) = mp; 579 return (0); 580 } 581 582 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 583 int 584 vop_stdbmap(ap) 585 struct vop_bmap_args /* { 586 struct vnode *a_vp; 587 daddr_t a_bn; 588 struct bufobj **a_bop; 589 daddr_t *a_bnp; 590 int *a_runp; 591 int *a_runb; 592 } */ *ap; 593 { 594 595 if (ap->a_bop != NULL) 596 *ap->a_bop = &ap->a_vp->v_bufobj; 597 if (ap->a_bnp != NULL) 598 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 599 if (ap->a_runp != NULL) 600 *ap->a_runp = 0; 601 if (ap->a_runb != NULL) 602 *ap->a_runb = 0; 603 return (0); 604 } 605 606 int 607 vop_stdfsync(ap) 608 struct vop_fsync_args /* { 609 struct vnode *a_vp; 610 struct ucred *a_cred; 611 int a_waitfor; 612 struct thread *a_td; 613 } */ *ap; 614 { 615 struct vnode *vp = ap->a_vp; 616 struct buf *bp; 617 struct bufobj *bo; 618 struct buf *nbp; 619 int error = 0; 620 int maxretry = 1000; /* large, arbitrarily chosen */ 621 622 bo = &vp->v_bufobj; 623 BO_LOCK(bo); 624 loop1: 625 /* 626 * MARK/SCAN initialization to avoid infinite loops. 627 */ 628 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 629 bp->b_vflags &= ~BV_SCANNED; 630 bp->b_error = 0; 631 } 632 633 /* 634 * Flush all dirty buffers associated with a vnode. 635 */ 636 loop2: 637 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 638 if ((bp->b_vflags & BV_SCANNED) != 0) 639 continue; 640 bp->b_vflags |= BV_SCANNED; 641 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) 642 continue; 643 BO_UNLOCK(bo); 644 KASSERT(bp->b_bufobj == bo, 645 ("bp %p wrong b_bufobj %p should be %p", 646 bp, bp->b_bufobj, bo)); 647 if ((bp->b_flags & B_DELWRI) == 0) 648 panic("fsync: not dirty"); 649 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 650 vfs_bio_awrite(bp); 651 } else { 652 bremfree(bp); 653 bawrite(bp); 654 } 655 BO_LOCK(bo); 656 goto loop2; 657 } 658 659 /* 660 * If synchronous the caller expects us to completely resolve all 661 * dirty buffers in the system. Wait for in-progress I/O to 662 * complete (which could include background bitmap writes), then 663 * retry if dirty blocks still exist. 664 */ 665 if (ap->a_waitfor == MNT_WAIT) { 666 bufobj_wwait(bo, 0, 0); 667 if (bo->bo_dirty.bv_cnt > 0) { 668 /* 669 * If we are unable to write any of these buffers 670 * then we fail now rather than trying endlessly 671 * to write them out. 672 */ 673 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 674 if ((error = bp->b_error) == 0) 675 continue; 676 if (error == 0 && --maxretry >= 0) 677 goto loop1; 678 error = EAGAIN; 679 } 680 } 681 BO_UNLOCK(bo); 682 if (error == EAGAIN) 683 vprint("fsync: giving up on dirty", vp); 684 685 return (error); 686 } 687 688 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 689 int 690 vop_stdgetpages(ap) 691 struct vop_getpages_args /* { 692 struct vnode *a_vp; 693 vm_page_t *a_m; 694 int a_count; 695 int a_reqpage; 696 vm_ooffset_t a_offset; 697 } */ *ap; 698 { 699 700 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 701 ap->a_count, ap->a_reqpage); 702 } 703 704 int 705 vop_stdkqfilter(struct vop_kqfilter_args *ap) 706 { 707 return vfs_kqfilter(ap); 708 } 709 710 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 711 int 712 vop_stdputpages(ap) 713 struct vop_putpages_args /* { 714 struct vnode *a_vp; 715 vm_page_t *a_m; 716 int a_count; 717 int a_sync; 718 int *a_rtvals; 719 vm_ooffset_t a_offset; 720 } */ *ap; 721 { 722 723 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 724 ap->a_sync, ap->a_rtvals); 725 } 726 727 int 728 vop_stdvptofh(struct vop_vptofh_args *ap) 729 { 730 return (EOPNOTSUPP); 731 } 732 733 int 734 vop_stdvptocnp(struct vop_vptocnp_args *ap) 735 { 736 struct vnode *vp = ap->a_vp; 737 struct vnode **dvp = ap->a_vpp; 738 struct ucred *cred = ap->a_cred; 739 char *buf = ap->a_buf; 740 int *buflen = ap->a_buflen; 741 char *dirbuf, *cpos; 742 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 743 off_t off; 744 ino_t fileno; 745 struct vattr va; 746 struct nameidata nd; 747 struct thread *td; 748 struct dirent *dp; 749 struct vnode *mvp; 750 751 i = *buflen; 752 error = 0; 753 covered = 0; 754 td = curthread; 755 756 if (vp->v_type != VDIR) 757 return (ENOENT); 758 759 error = VOP_GETATTR(vp, &va, cred); 760 if (error) 761 return (error); 762 763 VREF(vp); 764 locked = VOP_ISLOCKED(vp); 765 VOP_UNLOCK(vp, 0); 766 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 767 "..", vp, td); 768 flags = FREAD; 769 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 770 if (error) { 771 vn_lock(vp, locked | LK_RETRY); 772 return (error); 773 } 774 NDFREE(&nd, NDF_ONLY_PNBUF); 775 776 mvp = *dvp = nd.ni_vp; 777 778 if (vp->v_mount != (*dvp)->v_mount && 779 ((*dvp)->v_vflag & VV_ROOT) && 780 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 781 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 782 VREF(mvp); 783 VOP_UNLOCK(mvp, 0); 784 vn_close(mvp, FREAD, cred, td); 785 VREF(*dvp); 786 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 787 covered = 1; 788 } 789 790 fileno = va.va_fileid; 791 792 dirbuflen = DEV_BSIZE; 793 if (dirbuflen < va.va_blocksize) 794 dirbuflen = va.va_blocksize; 795 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 796 797 if ((*dvp)->v_type != VDIR) { 798 error = ENOENT; 799 goto out; 800 } 801 802 off = 0; 803 len = 0; 804 do { 805 /* call VOP_READDIR of parent */ 806 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 807 &cpos, &len, &eofflag, td); 808 if (error) 809 goto out; 810 811 if ((dp->d_type != DT_WHT) && 812 (dp->d_fileno == fileno)) { 813 if (covered) { 814 VOP_UNLOCK(*dvp, 0); 815 vn_lock(mvp, LK_EXCLUSIVE | LK_RETRY); 816 if (dirent_exists(mvp, dp->d_name, td)) { 817 error = ENOENT; 818 VOP_UNLOCK(mvp, 0); 819 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 820 goto out; 821 } 822 VOP_UNLOCK(mvp, 0); 823 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 824 } 825 i -= dp->d_namlen; 826 827 if (i < 0) { 828 error = ENOMEM; 829 goto out; 830 } 831 bcopy(dp->d_name, buf + i, dp->d_namlen); 832 error = 0; 833 goto out; 834 } 835 } while (len > 0 || !eofflag); 836 error = ENOENT; 837 838 out: 839 free(dirbuf, M_TEMP); 840 if (!error) { 841 *buflen = i; 842 vhold(*dvp); 843 } 844 if (covered) { 845 vput(*dvp); 846 vrele(mvp); 847 } else { 848 VOP_UNLOCK(mvp, 0); 849 vn_close(mvp, FREAD, cred, td); 850 } 851 vn_lock(vp, locked | LK_RETRY); 852 return (error); 853 } 854 855 /* 856 * vfs default ops 857 * used to fill the vfs function table to get reasonable default return values. 858 */ 859 int 860 vfs_stdroot (mp, flags, vpp) 861 struct mount *mp; 862 int flags; 863 struct vnode **vpp; 864 { 865 866 return (EOPNOTSUPP); 867 } 868 869 int 870 vfs_stdstatfs (mp, sbp) 871 struct mount *mp; 872 struct statfs *sbp; 873 { 874 875 return (EOPNOTSUPP); 876 } 877 878 int 879 vfs_stdquotactl (mp, cmds, uid, arg) 880 struct mount *mp; 881 int cmds; 882 uid_t uid; 883 void *arg; 884 { 885 886 return (EOPNOTSUPP); 887 } 888 889 int 890 vfs_stdsync(mp, waitfor) 891 struct mount *mp; 892 int waitfor; 893 { 894 struct vnode *vp, *mvp; 895 struct thread *td; 896 int error, lockreq, allerror = 0; 897 898 td = curthread; 899 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 900 if (waitfor != MNT_WAIT) 901 lockreq |= LK_NOWAIT; 902 /* 903 * Force stale buffer cache information to be flushed. 904 */ 905 MNT_ILOCK(mp); 906 loop: 907 MNT_VNODE_FOREACH(vp, mp, mvp) { 908 /* bv_cnt is an acceptable race here. */ 909 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) 910 continue; 911 VI_LOCK(vp); 912 MNT_IUNLOCK(mp); 913 if ((error = vget(vp, lockreq, td)) != 0) { 914 MNT_ILOCK(mp); 915 if (error == ENOENT) { 916 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); 917 goto loop; 918 } 919 continue; 920 } 921 error = VOP_FSYNC(vp, waitfor, td); 922 if (error) 923 allerror = error; 924 vput(vp); 925 MNT_ILOCK(mp); 926 } 927 MNT_IUNLOCK(mp); 928 return (allerror); 929 } 930 931 int 932 vfs_stdnosync (mp, waitfor) 933 struct mount *mp; 934 int waitfor; 935 { 936 937 return (0); 938 } 939 940 int 941 vfs_stdvget (mp, ino, flags, vpp) 942 struct mount *mp; 943 ino_t ino; 944 int flags; 945 struct vnode **vpp; 946 { 947 948 return (EOPNOTSUPP); 949 } 950 951 int 952 vfs_stdfhtovp (mp, fhp, vpp) 953 struct mount *mp; 954 struct fid *fhp; 955 struct vnode **vpp; 956 { 957 958 return (EOPNOTSUPP); 959 } 960 961 int 962 vfs_stdinit (vfsp) 963 struct vfsconf *vfsp; 964 { 965 966 return (0); 967 } 968 969 int 970 vfs_stduninit (vfsp) 971 struct vfsconf *vfsp; 972 { 973 974 return(0); 975 } 976 977 int 978 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 979 struct mount *mp; 980 int cmd; 981 struct vnode *filename_vp; 982 int attrnamespace; 983 const char *attrname; 984 { 985 986 if (filename_vp != NULL) 987 VOP_UNLOCK(filename_vp, 0); 988 return (EOPNOTSUPP); 989 } 990 991 int 992 vfs_stdsysctl(mp, op, req) 993 struct mount *mp; 994 fsctlop_t op; 995 struct sysctl_req *req; 996 { 997 998 return (EOPNOTSUPP); 999 } 1000 1001 /* end of vfs default ops */ 1002