1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed 8 * to Berkeley by John Heidemann of the 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 * 3. 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/param.h> 36 #include <sys/systm.h> 37 #include <sys/bio.h> 38 #include <sys/buf.h> 39 #include <sys/conf.h> 40 #include <sys/event.h> 41 #include <sys/filio.h> 42 #include <sys/kernel.h> 43 #include <sys/limits.h> 44 #include <sys/lock.h> 45 #include <sys/lockf.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/namei.h> 49 #include <sys/rwlock.h> 50 #include <sys/fcntl.h> 51 #include <sys/unistd.h> 52 #include <sys/vnode.h> 53 #include <sys/dirent.h> 54 #include <sys/poll.h> 55 #include <sys/stat.h> 56 #include <security/audit/audit.h> 57 #include <sys/priv.h> 58 59 #include <security/mac/mac_framework.h> 60 61 #include <vm/vm.h> 62 #include <vm/vm_object.h> 63 #include <vm/vm_extern.h> 64 #include <vm/pmap.h> 65 #include <vm/vm_map.h> 66 #include <vm/vm_page.h> 67 #include <vm/vm_pager.h> 68 #include <vm/vnode_pager.h> 69 70 static int vop_nolookup(struct vop_lookup_args *); 71 static int vop_norename(struct vop_rename_args *); 72 static int vop_nostrategy(struct vop_strategy_args *); 73 static int dirent_exists(struct vnode *vp, const char *dirname, 74 struct thread *td); 75 76 static int vop_stdis_text(struct vop_is_text_args *ap); 77 static int vop_stdunset_text(struct vop_unset_text_args *ap); 78 static int vop_stdadd_writecount(struct vop_add_writecount_args *ap); 79 static int vop_stdcopy_file_range(struct vop_copy_file_range_args *ap); 80 static int vop_stdfdatasync(struct vop_fdatasync_args *ap); 81 static int vop_stdgetpages_async(struct vop_getpages_async_args *ap); 82 static int vop_stdread_pgcache(struct vop_read_pgcache_args *ap); 83 static int vop_stdstat(struct vop_stat_args *ap); 84 static int vop_stdvput_pair(struct vop_vput_pair_args *ap); 85 static int vop_stdgetlowvnode(struct vop_getlowvnode_args *ap); 86 87 /* 88 * This vnode table stores what we want to do if the filesystem doesn't 89 * implement a particular VOP. 90 * 91 * If there is no specific entry here, we will return EOPNOTSUPP. 92 * 93 * Note that every filesystem has to implement either vop_access 94 * or vop_accessx; failing to do so will result in immediate crash 95 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(), 96 * which calls vop_stdaccess() etc. 97 */ 98 99 struct vop_vector default_vnodeops = { 100 .vop_default = NULL, 101 .vop_bypass = VOP_EOPNOTSUPP, 102 103 .vop_access = vop_stdaccess, 104 .vop_accessx = vop_stdaccessx, 105 .vop_advise = vop_stdadvise, 106 .vop_advlock = vop_stdadvlock, 107 .vop_advlockasync = vop_stdadvlockasync, 108 .vop_advlockpurge = vop_stdadvlockpurge, 109 .vop_allocate = vop_stdallocate, 110 .vop_deallocate = vop_stddeallocate, 111 .vop_bmap = vop_stdbmap, 112 .vop_close = VOP_NULL, 113 .vop_fsync = VOP_NULL, 114 .vop_stat = vop_stdstat, 115 .vop_fdatasync = vop_stdfdatasync, 116 .vop_getlowvnode = vop_stdgetlowvnode, 117 .vop_getpages = vop_stdgetpages, 118 .vop_getpages_async = vop_stdgetpages_async, 119 .vop_getwritemount = vop_stdgetwritemount, 120 .vop_inactive = VOP_NULL, 121 .vop_need_inactive = vop_stdneed_inactive, 122 .vop_ioctl = vop_stdioctl, 123 .vop_kqfilter = vop_stdkqfilter, 124 .vop_islocked = vop_stdislocked, 125 .vop_lock1 = vop_stdlock, 126 .vop_lookup = vop_nolookup, 127 .vop_open = VOP_NULL, 128 .vop_pathconf = VOP_EINVAL, 129 .vop_poll = vop_nopoll, 130 .vop_putpages = vop_stdputpages, 131 .vop_readlink = VOP_EINVAL, 132 .vop_read_pgcache = vop_stdread_pgcache, 133 .vop_rename = vop_norename, 134 .vop_revoke = VOP_PANIC, 135 .vop_strategy = vop_nostrategy, 136 .vop_unlock = vop_stdunlock, 137 .vop_vptocnp = vop_stdvptocnp, 138 .vop_vptofh = vop_stdvptofh, 139 .vop_unp_bind = vop_stdunp_bind, 140 .vop_unp_connect = vop_stdunp_connect, 141 .vop_unp_detach = vop_stdunp_detach, 142 .vop_is_text = vop_stdis_text, 143 .vop_set_text = vop_stdset_text, 144 .vop_unset_text = vop_stdunset_text, 145 .vop_add_writecount = vop_stdadd_writecount, 146 .vop_copy_file_range = vop_stdcopy_file_range, 147 .vop_vput_pair = vop_stdvput_pair, 148 }; 149 VFS_VOP_VECTOR_REGISTER(default_vnodeops); 150 151 /* 152 * Series of placeholder functions for various error returns for 153 * VOPs. 154 */ 155 156 int 157 vop_eopnotsupp(struct vop_generic_args *ap) 158 { 159 /* 160 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 161 */ 162 163 return (EOPNOTSUPP); 164 } 165 166 int 167 vop_ebadf(struct vop_generic_args *ap) 168 { 169 170 return (EBADF); 171 } 172 173 int 174 vop_enotty(struct vop_generic_args *ap) 175 { 176 177 return (ENOTTY); 178 } 179 180 int 181 vop_einval(struct vop_generic_args *ap) 182 { 183 184 return (EINVAL); 185 } 186 187 int 188 vop_enoent(struct vop_generic_args *ap) 189 { 190 191 return (ENOENT); 192 } 193 194 int 195 vop_eagain(struct vop_generic_args *ap) 196 { 197 198 return (EAGAIN); 199 } 200 201 int 202 vop_null(struct vop_generic_args *ap) 203 { 204 205 return (0); 206 } 207 208 /* 209 * Helper function to panic on some bad VOPs in some filesystems. 210 */ 211 int 212 vop_panic(struct vop_generic_args *ap) 213 { 214 215 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 216 } 217 218 /* 219 * vop_std<something> and vop_no<something> are default functions for use by 220 * filesystems that need the "default reasonable" implementation for a 221 * particular operation. 222 * 223 * The documentation for the operations they implement exists (if it exists) 224 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 225 */ 226 227 /* 228 * Default vop for filesystems that do not support name lookup 229 */ 230 static int 231 vop_nolookup(struct vop_lookup_args *ap) 232 { 233 234 *ap->a_vpp = NULL; 235 return (ENOTDIR); 236 } 237 238 /* 239 * vop_norename: 240 * 241 * Handle unlock and reference counting for arguments of vop_rename 242 * for filesystems that do not implement rename operation. 243 */ 244 static int 245 vop_norename(struct vop_rename_args *ap) 246 { 247 248 vop_rename_fail(ap); 249 return (EOPNOTSUPP); 250 } 251 252 /* 253 * vop_nostrategy: 254 * 255 * Strategy routine for VFS devices that have none. 256 * 257 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 258 * routine. Typically this is done for a BIO_READ strategy call. 259 * Typically B_INVAL is assumed to already be clear prior to a write 260 * and should not be cleared manually unless you just made the buffer 261 * invalid. BIO_ERROR should be cleared either way. 262 */ 263 264 static int 265 vop_nostrategy (struct vop_strategy_args *ap) 266 { 267 printf("No strategy for buffer at %p\n", ap->a_bp); 268 vn_printf(ap->a_vp, "vnode "); 269 ap->a_bp->b_ioflags |= BIO_ERROR; 270 ap->a_bp->b_error = EOPNOTSUPP; 271 bufdone(ap->a_bp); 272 return (EOPNOTSUPP); 273 } 274 275 /* 276 * Check if a named file exists in a given directory vnode 277 * 278 * Returns 0 if the file exists, ENOENT if it doesn't, or errors returned by 279 * vn_dir_next_dirent(). 280 */ 281 static int 282 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 283 { 284 char *dirbuf; 285 int error, eofflag; 286 size_t dirbuflen, len; 287 off_t off; 288 struct dirent *dp; 289 struct vattr va; 290 291 ASSERT_VOP_LOCKED(vp, "vnode not locked"); 292 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 293 294 error = VOP_GETATTR(vp, &va, td->td_ucred); 295 if (error != 0) 296 return (error); 297 298 dirbuflen = MAX(DEV_BSIZE, GENERIC_MAXDIRSIZ); 299 if (dirbuflen < va.va_blocksize) 300 dirbuflen = va.va_blocksize; 301 dirbuf = malloc(dirbuflen, M_TEMP, M_WAITOK); 302 303 len = 0; 304 off = 0; 305 eofflag = 0; 306 307 for (;;) { 308 error = vn_dir_next_dirent(vp, td, dirbuf, dirbuflen, 309 &dp, &len, &off, &eofflag); 310 if (error != 0) 311 goto out; 312 313 if (len == 0) 314 break; 315 316 if (dp->d_type != DT_WHT && dp->d_fileno != 0 && 317 strcmp(dp->d_name, dirname) == 0) 318 goto out; 319 } 320 321 error = ENOENT; 322 323 out: 324 free(dirbuf, M_TEMP); 325 return (error); 326 } 327 328 int 329 vop_stdaccess(struct vop_access_args *ap) 330 { 331 332 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | 333 VAPPEND)) == 0, ("invalid bit in accmode")); 334 335 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td)); 336 } 337 338 int 339 vop_stdaccessx(struct vop_accessx_args *ap) 340 { 341 int error; 342 accmode_t accmode = ap->a_accmode; 343 344 error = vfs_unixify_accmode(&accmode); 345 if (error != 0) 346 return (error); 347 348 if (accmode == 0) 349 return (0); 350 351 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 352 } 353 354 /* 355 * Advisory record locking support 356 */ 357 int 358 vop_stdadvlock(struct vop_advlock_args *ap) 359 { 360 struct vnode *vp; 361 struct mount *mp; 362 struct vattr vattr; 363 int error; 364 365 vp = ap->a_vp; 366 367 /* 368 * Provide atomicity of open(O_CREAT | O_EXCL | O_EXLOCK) for 369 * local filesystems. See vn_open_cred() for reciprocal part. 370 */ 371 mp = vp->v_mount; 372 if (mp != NULL && (mp->mnt_flag & MNT_LOCAL) != 0 && 373 ap->a_op == F_SETLK && (ap->a_flags & F_FIRSTOPEN) == 0) { 374 VI_LOCK(vp); 375 while ((vp->v_iflag & VI_FOPENING) != 0) 376 msleep(vp, VI_MTX(vp), PLOCK, "lockfo", 0); 377 VI_UNLOCK(vp); 378 } 379 380 if (ap->a_fl->l_whence == SEEK_END) { 381 /* 382 * The NFSv4 server must avoid doing a vn_lock() here, since it 383 * can deadlock the nfsd threads, due to a LOR. Fortunately 384 * the NFSv4 server always uses SEEK_SET and this code is 385 * only required for the SEEK_END case. 386 */ 387 vn_lock(vp, LK_SHARED | LK_RETRY); 388 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 389 VOP_UNLOCK(vp); 390 if (error) 391 return (error); 392 } else 393 vattr.va_size = 0; 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 vattr vattr; 403 int error; 404 405 vp = ap->a_vp; 406 if (ap->a_fl->l_whence == SEEK_END) { 407 /* The size argument is only needed for SEEK_END. */ 408 vn_lock(vp, LK_SHARED | LK_RETRY); 409 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 410 VOP_UNLOCK(vp); 411 if (error) 412 return (error); 413 } else 414 vattr.va_size = 0; 415 416 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 417 } 418 419 int 420 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap) 421 { 422 struct vnode *vp; 423 424 vp = ap->a_vp; 425 lf_purgelocks(vp, &vp->v_lockf); 426 return (0); 427 } 428 429 /* 430 * vop_stdpathconf: 431 * 432 * Standard implementation of POSIX pathconf, to get information about limits 433 * for a filesystem. 434 * Override per filesystem for the case where the filesystem has smaller 435 * limits. 436 */ 437 int 438 vop_stdpathconf(struct vop_pathconf_args *ap) 439 { 440 441 switch (ap->a_name) { 442 case _PC_ASYNC_IO: 443 *ap->a_retval = _POSIX_ASYNCHRONOUS_IO; 444 return (0); 445 case _PC_PATH_MAX: 446 *ap->a_retval = PATH_MAX; 447 return (0); 448 case _PC_ACL_EXTENDED: 449 case _PC_ACL_NFS4: 450 case _PC_CAP_PRESENT: 451 case _PC_DEALLOC_PRESENT: 452 case _PC_INF_PRESENT: 453 case _PC_MAC_PRESENT: 454 case _PC_NAMEDATTR_ENABLED: 455 case _PC_HAS_NAMEDATTR: 456 *ap->a_retval = 0; 457 return (0); 458 default: 459 return (EINVAL); 460 } 461 /* NOTREACHED */ 462 } 463 464 /* 465 * Standard lock, unlock and islocked functions. 466 */ 467 int 468 vop_stdlock(struct vop_lock1_args *ap) 469 { 470 struct vnode *vp = ap->a_vp; 471 struct mtx *ilk; 472 473 ilk = VI_MTX(vp); 474 return (lockmgr_lock_flags(vp->v_vnlock, ap->a_flags, 475 &ilk->lock_object, ap->a_file, ap->a_line)); 476 } 477 478 /* See above. */ 479 int 480 vop_stdunlock(struct vop_unlock_args *ap) 481 { 482 struct vnode *vp = ap->a_vp; 483 484 return (lockmgr_unlock(vp->v_vnlock)); 485 } 486 487 /* See above. */ 488 int 489 vop_stdislocked(struct vop_islocked_args *ap) 490 { 491 492 return (lockstatus(ap->a_vp->v_vnlock)); 493 } 494 495 /* 496 * Variants of the above set. 497 * 498 * Differences are: 499 * - shared locking disablement is not supported 500 * - v_vnlock pointer is not honored 501 */ 502 int 503 vop_lock(struct vop_lock1_args *ap) 504 { 505 struct vnode *vp = ap->a_vp; 506 int flags = ap->a_flags; 507 struct mtx *ilk; 508 509 MPASS(vp->v_vnlock == &vp->v_lock); 510 511 if (__predict_false((flags & ~(LK_TYPE_MASK | LK_NODDLKTREAT | LK_RETRY)) != 0)) 512 goto other; 513 514 switch (flags & LK_TYPE_MASK) { 515 case LK_SHARED: 516 return (lockmgr_slock(&vp->v_lock, flags, ap->a_file, ap->a_line)); 517 case LK_EXCLUSIVE: 518 return (lockmgr_xlock(&vp->v_lock, flags, ap->a_file, ap->a_line)); 519 } 520 other: 521 ilk = VI_MTX(vp); 522 return (lockmgr_lock_flags(&vp->v_lock, flags, 523 &ilk->lock_object, ap->a_file, ap->a_line)); 524 } 525 526 int 527 vop_unlock(struct vop_unlock_args *ap) 528 { 529 struct vnode *vp = ap->a_vp; 530 531 MPASS(vp->v_vnlock == &vp->v_lock); 532 533 return (lockmgr_unlock(&vp->v_lock)); 534 } 535 536 int 537 vop_islocked(struct vop_islocked_args *ap) 538 { 539 struct vnode *vp = ap->a_vp; 540 541 MPASS(vp->v_vnlock == &vp->v_lock); 542 543 return (lockstatus(&vp->v_lock)); 544 } 545 546 /* 547 * Return true for select/poll. 548 */ 549 int 550 vop_nopoll(struct vop_poll_args *ap) 551 { 552 553 if (ap->a_events & ~POLLSTANDARD) 554 return (POLLNVAL); 555 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 556 } 557 558 /* 559 * Implement poll for local filesystems that support it. 560 */ 561 int 562 vop_stdpoll(struct vop_poll_args *ap) 563 { 564 if (ap->a_events & ~POLLSTANDARD) 565 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 566 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 567 } 568 569 /* 570 * Return our mount point, as we will take charge of the writes. 571 */ 572 int 573 vop_stdgetwritemount(struct vop_getwritemount_args *ap) 574 { 575 struct mount *mp; 576 struct vnode *vp; 577 578 /* 579 * Note that having a reference does not prevent forced unmount from 580 * setting ->v_mount to NULL after the lock gets released. This is of 581 * no consequence for typical consumers (most notably vn_start_write) 582 * since in this case the vnode is VIRF_DOOMED. Unmount might have 583 * progressed far enough that its completion is only delayed by the 584 * reference obtained here. The consumer only needs to concern itself 585 * with releasing it. 586 */ 587 vp = ap->a_vp; 588 mp = vfs_ref_from_vp(vp); 589 *(ap->a_mpp) = mp; 590 return (0); 591 } 592 593 /* 594 * If the file system doesn't implement VOP_BMAP, then return sensible defaults: 595 * - Return the vnode's bufobj instead of any underlying device's bufobj 596 * - Calculate the physical block number as if there were equal size 597 * consecutive blocks, but 598 * - Report no contiguous runs of blocks. 599 */ 600 int 601 vop_stdbmap(struct vop_bmap_args *ap) 602 { 603 604 if (ap->a_bop != NULL) 605 *ap->a_bop = &ap->a_vp->v_bufobj; 606 if (ap->a_bnp != NULL) 607 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 608 if (ap->a_runp != NULL) 609 *ap->a_runp = 0; 610 if (ap->a_runb != NULL) 611 *ap->a_runb = 0; 612 return (0); 613 } 614 615 int 616 vop_stdfsync(struct vop_fsync_args *ap) 617 { 618 619 return (vn_fsync_buf(ap->a_vp, ap->a_waitfor)); 620 } 621 622 static int 623 vop_stdfdatasync(struct vop_fdatasync_args *ap) 624 { 625 626 return (VOP_FSYNC(ap->a_vp, MNT_WAIT, ap->a_td)); 627 } 628 629 int 630 vop_stdfdatasync_buf(struct vop_fdatasync_args *ap) 631 { 632 633 return (vn_fsync_buf(ap->a_vp, MNT_WAIT)); 634 } 635 636 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 637 int 638 vop_stdgetpages(struct vop_getpages_args *ap) 639 { 640 641 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 642 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL); 643 } 644 645 static int 646 vop_stdgetpages_async(struct vop_getpages_async_args *ap) 647 { 648 int error; 649 650 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind, 651 ap->a_rahead); 652 if (ap->a_iodone != NULL) 653 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error); 654 return (error); 655 } 656 657 int 658 vop_stdkqfilter(struct vop_kqfilter_args *ap) 659 { 660 return vfs_kqfilter(ap); 661 } 662 663 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 664 int 665 vop_stdputpages(struct vop_putpages_args *ap) 666 { 667 668 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 669 ap->a_sync, ap->a_rtvals); 670 } 671 672 int 673 vop_stdvptofh(struct vop_vptofh_args *ap) 674 { 675 return (EOPNOTSUPP); 676 } 677 678 int 679 vop_stdvptocnp(struct vop_vptocnp_args *ap) 680 { 681 struct vnode *const vp = ap->a_vp; 682 struct vnode **const dvp = ap->a_vpp; 683 char *buf = ap->a_buf; 684 size_t *buflen = ap->a_buflen; 685 char *dirbuf; 686 int i = *buflen; 687 int error = 0, covered = 0; 688 int eofflag, flags, locked; 689 size_t dirbuflen, len; 690 off_t off; 691 ino_t fileno; 692 struct vattr va; 693 struct nameidata nd; 694 struct thread *const td = curthread; 695 struct ucred *const cred = td->td_ucred; 696 struct dirent *dp; 697 struct vnode *mvp; 698 699 if (vp->v_type != VDIR) 700 return (ENOENT); 701 702 error = VOP_GETATTR(vp, &va, cred); 703 if (error) 704 return (error); 705 706 VREF(vp); 707 locked = VOP_ISLOCKED(vp); 708 VOP_UNLOCK(vp); 709 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE, 710 "..", vp); 711 flags = FREAD; 712 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 713 if (error) { 714 vn_lock(vp, locked | LK_RETRY); 715 return (error); 716 } 717 NDFREE_PNBUF(&nd); 718 719 mvp = *dvp = nd.ni_vp; 720 721 if (vp->v_mount != (*dvp)->v_mount && 722 ((*dvp)->v_vflag & VV_ROOT) && 723 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 724 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 725 VREF(mvp); 726 VOP_UNLOCK(mvp); 727 vn_close(mvp, FREAD, cred, td); 728 VREF(*dvp); 729 vn_lock(*dvp, LK_SHARED | LK_RETRY); 730 covered = 1; 731 } 732 733 fileno = va.va_fileid; 734 735 dirbuflen = MAX(DEV_BSIZE, GENERIC_MAXDIRSIZ); 736 if (dirbuflen < va.va_blocksize) 737 dirbuflen = va.va_blocksize; 738 dirbuf = malloc(dirbuflen, M_TEMP, M_WAITOK); 739 740 if ((*dvp)->v_type != VDIR) { 741 error = ENOENT; 742 goto out; 743 } 744 745 len = 0; 746 off = 0; 747 eofflag = 0; 748 749 for (;;) { 750 /* call VOP_READDIR of parent */ 751 error = vn_dir_next_dirent(*dvp, td, 752 dirbuf, dirbuflen, &dp, &len, &off, &eofflag); 753 if (error != 0) 754 goto out; 755 756 if (len == 0) { 757 error = ENOENT; 758 goto out; 759 } 760 761 if ((dp->d_type != DT_WHT) && 762 (dp->d_fileno == fileno)) { 763 if (covered) { 764 VOP_UNLOCK(*dvp); 765 vn_lock(mvp, LK_SHARED | LK_RETRY); 766 if (dirent_exists(mvp, dp->d_name, td) == 0) { 767 error = ENOENT; 768 VOP_UNLOCK(mvp); 769 vn_lock(*dvp, LK_SHARED | LK_RETRY); 770 goto out; 771 } 772 VOP_UNLOCK(mvp); 773 vn_lock(*dvp, LK_SHARED | LK_RETRY); 774 } 775 i -= dp->d_namlen; 776 777 if (i < 0) { 778 error = ENOMEM; 779 goto out; 780 } 781 if (dp->d_namlen == 1 && dp->d_name[0] == '.') { 782 error = ENOENT; 783 } else { 784 bcopy(dp->d_name, buf + i, dp->d_namlen); 785 error = 0; 786 } 787 goto out; 788 } 789 } 790 791 out: 792 free(dirbuf, M_TEMP); 793 if (!error) { 794 *buflen = i; 795 vref(*dvp); 796 } 797 if (covered) { 798 vput(*dvp); 799 vrele(mvp); 800 } else { 801 VOP_UNLOCK(mvp); 802 vn_close(mvp, FREAD, cred, td); 803 } 804 vn_lock(vp, locked | LK_RETRY); 805 return (error); 806 } 807 808 int 809 vop_stdallocate(struct vop_allocate_args *ap) 810 { 811 #ifdef __notyet__ 812 struct statfs *sfs; 813 off_t maxfilesize = 0; 814 #endif 815 struct iovec aiov; 816 struct vattr vattr, *vap; 817 struct uio auio; 818 off_t fsize, len, cur, offset; 819 uint8_t *buf; 820 struct thread *td; 821 struct vnode *vp; 822 size_t iosize; 823 int error; 824 825 buf = NULL; 826 error = 0; 827 td = curthread; 828 vap = &vattr; 829 vp = ap->a_vp; 830 len = *ap->a_len; 831 offset = *ap->a_offset; 832 833 error = VOP_GETATTR(vp, vap, ap->a_cred); 834 if (error != 0) 835 goto out; 836 fsize = vap->va_size; 837 iosize = vap->va_blocksize; 838 if (iosize == 0) 839 iosize = BLKDEV_IOSIZE; 840 if (iosize > maxphys) 841 iosize = maxphys; 842 buf = malloc(iosize, M_TEMP, M_WAITOK); 843 844 #ifdef __notyet__ 845 /* 846 * Check if the filesystem sets f_maxfilesize; if not use 847 * VOP_SETATTR to perform the check. 848 */ 849 sfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 850 error = VFS_STATFS(vp->v_mount, sfs, td); 851 if (error == 0) 852 maxfilesize = sfs->f_maxfilesize; 853 free(sfs, M_STATFS); 854 if (error != 0) 855 goto out; 856 if (maxfilesize) { 857 if (offset > maxfilesize || len > maxfilesize || 858 offset + len > maxfilesize) { 859 error = EFBIG; 860 goto out; 861 } 862 } else 863 #endif 864 if (offset + len > vap->va_size) { 865 /* 866 * Test offset + len against the filesystem's maxfilesize. 867 */ 868 VATTR_NULL(vap); 869 vap->va_size = offset + len; 870 error = VOP_SETATTR(vp, vap, ap->a_cred); 871 if (error != 0) 872 goto out; 873 VATTR_NULL(vap); 874 vap->va_size = fsize; 875 error = VOP_SETATTR(vp, vap, ap->a_cred); 876 if (error != 0) 877 goto out; 878 } 879 880 for (;;) { 881 /* 882 * Read and write back anything below the nominal file 883 * size. There's currently no way outside the filesystem 884 * to know whether this area is sparse or not. 885 */ 886 cur = iosize; 887 if ((offset % iosize) != 0) 888 cur -= (offset % iosize); 889 if (cur > len) 890 cur = len; 891 if (offset < fsize) { 892 aiov.iov_base = buf; 893 aiov.iov_len = cur; 894 auio.uio_iov = &aiov; 895 auio.uio_iovcnt = 1; 896 auio.uio_offset = offset; 897 auio.uio_resid = cur; 898 auio.uio_segflg = UIO_SYSSPACE; 899 auio.uio_rw = UIO_READ; 900 auio.uio_td = td; 901 error = VOP_READ(vp, &auio, ap->a_ioflag, ap->a_cred); 902 if (error != 0) 903 break; 904 if (auio.uio_resid > 0) { 905 bzero(buf + cur - auio.uio_resid, 906 auio.uio_resid); 907 } 908 } else { 909 bzero(buf, cur); 910 } 911 912 aiov.iov_base = buf; 913 aiov.iov_len = cur; 914 auio.uio_iov = &aiov; 915 auio.uio_iovcnt = 1; 916 auio.uio_offset = offset; 917 auio.uio_resid = cur; 918 auio.uio_segflg = UIO_SYSSPACE; 919 auio.uio_rw = UIO_WRITE; 920 auio.uio_td = td; 921 922 error = VOP_WRITE(vp, &auio, ap->a_ioflag, ap->a_cred); 923 if (error != 0) 924 break; 925 926 len -= cur; 927 offset += cur; 928 if (len == 0) 929 break; 930 if (should_yield()) 931 break; 932 } 933 934 out: 935 *ap->a_len = len; 936 *ap->a_offset = offset; 937 free(buf, M_TEMP); 938 return (error); 939 } 940 941 static int 942 vp_zerofill(struct vnode *vp, struct vattr *vap, off_t *offsetp, off_t *lenp, 943 int ioflag, struct ucred *cred) 944 { 945 int iosize; 946 int error = 0; 947 struct iovec aiov; 948 struct uio auio; 949 struct thread *td; 950 off_t offset, len; 951 952 iosize = vap->va_blocksize; 953 td = curthread; 954 offset = *offsetp; 955 len = *lenp; 956 957 if (iosize == 0) 958 iosize = BLKDEV_IOSIZE; 959 /* If va_blocksize is 512 bytes, iosize will be 4 kilobytes */ 960 iosize = min(iosize * 8, ZERO_REGION_SIZE); 961 962 while (len > 0) { 963 int xfersize = iosize; 964 if (offset % iosize != 0) 965 xfersize -= offset % iosize; 966 if (xfersize > len) 967 xfersize = len; 968 969 aiov.iov_base = __DECONST(void *, zero_region); 970 aiov.iov_len = xfersize; 971 auio.uio_iov = &aiov; 972 auio.uio_iovcnt = 1; 973 auio.uio_offset = offset; 974 auio.uio_resid = xfersize; 975 auio.uio_segflg = UIO_SYSSPACE; 976 auio.uio_rw = UIO_WRITE; 977 auio.uio_td = td; 978 979 error = VOP_WRITE(vp, &auio, ioflag, cred); 980 if (error != 0) { 981 len -= xfersize - auio.uio_resid; 982 offset += xfersize - auio.uio_resid; 983 break; 984 } 985 986 len -= xfersize; 987 offset += xfersize; 988 } 989 990 *offsetp = offset; 991 *lenp = len; 992 return (error); 993 } 994 995 int 996 vop_stddeallocate(struct vop_deallocate_args *ap) 997 { 998 struct vnode *vp; 999 off_t offset, len; 1000 struct ucred *cred; 1001 int error; 1002 struct vattr va; 1003 off_t noff, xfersize, rem; 1004 1005 vp = ap->a_vp; 1006 offset = *ap->a_offset; 1007 cred = ap->a_cred; 1008 1009 error = VOP_GETATTR(vp, &va, cred); 1010 if (error) 1011 return (error); 1012 1013 len = omin((off_t)va.va_size - offset, *ap->a_len); 1014 while (len > 0) { 1015 noff = offset; 1016 error = vn_bmap_seekhole_locked(vp, FIOSEEKDATA, &noff, cred); 1017 if (error) { 1018 if (error != ENXIO) 1019 /* XXX: Is it okay to fallback further? */ 1020 goto out; 1021 1022 /* 1023 * No more data region to be filled 1024 */ 1025 offset += len; 1026 len = 0; 1027 error = 0; 1028 break; 1029 } 1030 KASSERT(noff >= offset, ("FIOSEEKDATA going backward")); 1031 if (noff != offset) { 1032 xfersize = omin(noff - offset, len); 1033 len -= xfersize; 1034 offset += xfersize; 1035 if (len == 0) 1036 break; 1037 } 1038 error = vn_bmap_seekhole_locked(vp, FIOSEEKHOLE, &noff, cred); 1039 if (error) 1040 goto out; 1041 1042 /* Fill zeroes */ 1043 xfersize = rem = omin(noff - offset, len); 1044 error = vp_zerofill(vp, &va, &offset, &rem, ap->a_ioflag, cred); 1045 if (error) { 1046 len -= xfersize - rem; 1047 goto out; 1048 } 1049 1050 len -= xfersize; 1051 if (should_yield()) 1052 break; 1053 } 1054 /* Handle the case when offset is beyond EOF */ 1055 if (len < 0) 1056 len = 0; 1057 out: 1058 *ap->a_offset = offset; 1059 *ap->a_len = len; 1060 return (error); 1061 } 1062 1063 int 1064 vop_stdadvise(struct vop_advise_args *ap) 1065 { 1066 struct vnode *vp; 1067 struct bufobj *bo; 1068 uintmax_t bstart, bend; 1069 daddr_t startn, endn; 1070 int bsize, error; 1071 1072 vp = ap->a_vp; 1073 switch (ap->a_advice) { 1074 case POSIX_FADV_WILLNEED: 1075 /* 1076 * Do nothing for now. Filesystems should provide a 1077 * custom method which starts an asynchronous read of 1078 * the requested region. 1079 */ 1080 error = 0; 1081 break; 1082 case POSIX_FADV_DONTNEED: 1083 error = 0; 1084 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1085 if (VN_IS_DOOMED(vp)) { 1086 VOP_UNLOCK(vp); 1087 break; 1088 } 1089 1090 /* 1091 * Round to block boundaries (and later possibly further to 1092 * page boundaries). Applications cannot reasonably be aware 1093 * of the boundaries, and the rounding must be to expand at 1094 * both extremities to cover enough. It still doesn't cover 1095 * read-ahead. For partial blocks, this gives unnecessary 1096 * discarding of buffers but is efficient enough since the 1097 * pages usually remain in VMIO for some time. 1098 */ 1099 bsize = vp->v_bufobj.bo_bsize; 1100 bstart = rounddown(ap->a_start, bsize); 1101 bend = ap->a_end; 1102 bend = roundup(bend, bsize); 1103 1104 /* 1105 * Deactivate pages in the specified range from the backing VM 1106 * object. Pages that are resident in the buffer cache will 1107 * remain wired until their corresponding buffers are released 1108 * below. 1109 */ 1110 if (vp->v_object != NULL) { 1111 VM_OBJECT_RLOCK(vp->v_object); 1112 vm_object_page_noreuse(vp->v_object, 1113 OFF_TO_IDX(trunc_page(bstart)), 1114 OFF_TO_IDX(round_page(bend))); 1115 VM_OBJECT_RUNLOCK(vp->v_object); 1116 } 1117 1118 bo = &vp->v_bufobj; 1119 startn = bstart / bsize; 1120 endn = bend / bsize; 1121 BO_RLOCK(bo); 1122 error = bnoreuselist(&bo->bo_clean, bo, startn, endn); 1123 if (error == 0) 1124 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn); 1125 BO_RUNLOCK(bo); 1126 VOP_UNLOCK(vp); 1127 break; 1128 default: 1129 error = EINVAL; 1130 break; 1131 } 1132 return (error); 1133 } 1134 1135 int 1136 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1137 { 1138 1139 ap->a_vp->v_unpcb = ap->a_unpcb; 1140 return (0); 1141 } 1142 1143 int 1144 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1145 { 1146 1147 *ap->a_unpcb = ap->a_vp->v_unpcb; 1148 return (0); 1149 } 1150 1151 int 1152 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1153 { 1154 1155 ap->a_vp->v_unpcb = NULL; 1156 return (0); 1157 } 1158 1159 static int 1160 vop_stdis_text(struct vop_is_text_args *ap) 1161 { 1162 1163 return ((int)atomic_load_int(&ap->a_vp->v_writecount) < 0); 1164 } 1165 1166 int 1167 vop_stdset_text(struct vop_set_text_args *ap) 1168 { 1169 struct vnode *vp; 1170 int n; 1171 bool gotref; 1172 1173 vp = ap->a_vp; 1174 1175 n = atomic_load_int(&vp->v_writecount); 1176 for (;;) { 1177 if (__predict_false(n > 0)) { 1178 return (ETXTBSY); 1179 } 1180 1181 /* 1182 * Transition point, we may need to grab a reference on the vnode. 1183 * 1184 * Take the ref early As a safety measure against bogus calls 1185 * to vop_stdunset_text. 1186 */ 1187 if (n == 0) { 1188 gotref = false; 1189 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) { 1190 vref(vp); 1191 gotref = true; 1192 } 1193 if (atomic_fcmpset_int(&vp->v_writecount, &n, -1)) { 1194 return (0); 1195 } 1196 if (gotref) { 1197 vunref(vp); 1198 } 1199 continue; 1200 } 1201 1202 MPASS(n < 0); 1203 if (atomic_fcmpset_int(&vp->v_writecount, &n, n - 1)) { 1204 return (0); 1205 } 1206 } 1207 __assert_unreachable(); 1208 } 1209 1210 static int 1211 vop_stdunset_text(struct vop_unset_text_args *ap) 1212 { 1213 struct vnode *vp; 1214 int n; 1215 1216 vp = ap->a_vp; 1217 1218 n = atomic_load_int(&vp->v_writecount); 1219 for (;;) { 1220 if (__predict_false(n >= 0)) { 1221 return (EINVAL); 1222 } 1223 1224 /* 1225 * Transition point, we may need to release a reference on the vnode. 1226 */ 1227 if (n == -1) { 1228 if (atomic_fcmpset_int(&vp->v_writecount, &n, 0)) { 1229 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) { 1230 vunref(vp); 1231 } 1232 return (0); 1233 } 1234 continue; 1235 } 1236 1237 MPASS(n < -1); 1238 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + 1)) { 1239 return (0); 1240 } 1241 } 1242 __assert_unreachable(); 1243 } 1244 1245 static __always_inline int 1246 vop_stdadd_writecount_impl(struct vop_add_writecount_args *ap, bool handle_msync) 1247 { 1248 struct vnode *vp; 1249 struct mount *mp __diagused; 1250 int n; 1251 1252 vp = ap->a_vp; 1253 1254 #ifdef INVARIANTS 1255 mp = vp->v_mount; 1256 if (mp != NULL) { 1257 if (handle_msync) { 1258 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) == 0, vp); 1259 } else { 1260 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) != 0, vp); 1261 } 1262 } 1263 #endif 1264 1265 n = atomic_load_int(&vp->v_writecount); 1266 for (;;) { 1267 if (__predict_false(n < 0)) { 1268 return (ETXTBSY); 1269 } 1270 1271 VNASSERT(n + ap->a_inc >= 0, vp, 1272 ("neg writecount increment %d + %d = %d", n, ap->a_inc, 1273 n + ap->a_inc)); 1274 if (n == 0) { 1275 if (handle_msync) { 1276 vlazy(vp); 1277 } 1278 } 1279 1280 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + ap->a_inc)) { 1281 return (0); 1282 } 1283 } 1284 __assert_unreachable(); 1285 } 1286 1287 int 1288 vop_stdadd_writecount(struct vop_add_writecount_args *ap) 1289 { 1290 1291 return (vop_stdadd_writecount_impl(ap, true)); 1292 } 1293 1294 int 1295 vop_stdadd_writecount_nomsync(struct vop_add_writecount_args *ap) 1296 { 1297 1298 return (vop_stdadd_writecount_impl(ap, false)); 1299 } 1300 1301 int 1302 vop_stdneed_inactive(struct vop_need_inactive_args *ap) 1303 { 1304 1305 return (1); 1306 } 1307 1308 int 1309 vop_stdioctl(struct vop_ioctl_args *ap) 1310 { 1311 struct vnode *vp; 1312 struct vattr va; 1313 off_t *offp; 1314 int error; 1315 1316 switch (ap->a_command) { 1317 case FIOSEEKDATA: 1318 case FIOSEEKHOLE: 1319 vp = ap->a_vp; 1320 error = vn_lock(vp, LK_SHARED); 1321 if (error != 0) 1322 return (EBADF); 1323 if (vp->v_type == VREG) 1324 error = VOP_GETATTR(vp, &va, ap->a_cred); 1325 else 1326 error = ENOTTY; 1327 if (error == 0) { 1328 offp = ap->a_data; 1329 if (*offp < 0 || *offp >= va.va_size) 1330 error = ENXIO; 1331 else if (ap->a_command == FIOSEEKHOLE) 1332 *offp = va.va_size; 1333 } 1334 VOP_UNLOCK(vp); 1335 break; 1336 default: 1337 error = ENOTTY; 1338 break; 1339 } 1340 return (error); 1341 } 1342 1343 /* 1344 * vfs default ops 1345 * used to fill the vfs function table to get reasonable default return values. 1346 */ 1347 int 1348 vfs_stdroot(struct mount *mp, int flags, struct vnode **vpp) 1349 { 1350 1351 return (EOPNOTSUPP); 1352 } 1353 1354 int 1355 vfs_stdstatfs(struct mount *mp, struct statfs *sbp) 1356 { 1357 1358 return (EOPNOTSUPP); 1359 } 1360 1361 int 1362 vfs_stdquotactl(struct mount *mp, int cmds, uid_t uid, void *arg, bool *mp_busy) 1363 { 1364 return (EOPNOTSUPP); 1365 } 1366 1367 int 1368 vfs_stdsync(struct mount *mp, int waitfor) 1369 { 1370 struct vnode *vp, *mvp; 1371 struct thread *td; 1372 int error, lockreq, allerror = 0; 1373 1374 td = curthread; 1375 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1376 if (waitfor != MNT_WAIT) 1377 lockreq |= LK_NOWAIT; 1378 /* 1379 * Force stale buffer cache information to be flushed. 1380 */ 1381 loop: 1382 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1383 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1384 VI_UNLOCK(vp); 1385 continue; 1386 } 1387 if ((error = vget(vp, lockreq)) != 0) { 1388 if (error == ENOENT) { 1389 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1390 goto loop; 1391 } 1392 continue; 1393 } 1394 error = VOP_FSYNC(vp, waitfor, td); 1395 if (error) 1396 allerror = error; 1397 vput(vp); 1398 } 1399 return (allerror); 1400 } 1401 1402 int 1403 vfs_stdnosync(struct mount *mp, int waitfor) 1404 { 1405 1406 return (0); 1407 } 1408 1409 static int 1410 vop_stdcopy_file_range(struct vop_copy_file_range_args *ap) 1411 { 1412 int error; 1413 1414 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 1415 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, ap->a_incred, 1416 ap->a_outcred, ap->a_fsizetd); 1417 return (error); 1418 } 1419 1420 int 1421 vfs_stdvget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 1422 { 1423 1424 return (EOPNOTSUPP); 1425 } 1426 1427 int 1428 vfs_stdfhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1429 { 1430 1431 return (EOPNOTSUPP); 1432 } 1433 1434 int 1435 vfs_stdinit(struct vfsconf *vfsp) 1436 { 1437 1438 return (0); 1439 } 1440 1441 int 1442 vfs_stduninit(struct vfsconf *vfsp) 1443 { 1444 1445 return(0); 1446 } 1447 1448 int 1449 vfs_stdextattrctl(struct mount *mp, int cmd, struct vnode *filename_vp, 1450 int attrnamespace, const char *attrname) 1451 { 1452 1453 if (filename_vp != NULL) 1454 VOP_UNLOCK(filename_vp); 1455 return (EOPNOTSUPP); 1456 } 1457 1458 int 1459 vfs_stdsysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req) 1460 { 1461 1462 return (EOPNOTSUPP); 1463 } 1464 1465 static vop_bypass_t * 1466 bp_by_off(struct vop_vector *vop, struct vop_generic_args *a) 1467 { 1468 1469 return (*(vop_bypass_t **)((char *)vop + a->a_desc->vdesc_vop_offset)); 1470 } 1471 1472 int 1473 vop_sigdefer(struct vop_vector *vop, struct vop_generic_args *a) 1474 { 1475 vop_bypass_t *bp; 1476 int prev_stops, rc; 1477 1478 bp = bp_by_off(vop, a); 1479 MPASS(bp != NULL); 1480 1481 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT); 1482 rc = bp(a); 1483 sigallowstop(prev_stops); 1484 return (rc); 1485 } 1486 1487 static int 1488 vop_stdstat(struct vop_stat_args *a) 1489 { 1490 struct vattr vattr; 1491 struct vattr *vap; 1492 struct vnode *vp; 1493 struct stat *sb; 1494 int error; 1495 u_short mode; 1496 1497 vp = a->a_vp; 1498 sb = a->a_sb; 1499 1500 error = vop_stat_helper_pre(a); 1501 if (error != 0) 1502 return (error); 1503 1504 vap = &vattr; 1505 1506 /* 1507 * Initialize defaults for new and unusual fields, so that file 1508 * systems which don't support these fields don't need to know 1509 * about them. 1510 */ 1511 vap->va_birthtime.tv_sec = -1; 1512 vap->va_birthtime.tv_nsec = 0; 1513 vap->va_fsid = VNOVAL; 1514 vap->va_gen = 0; 1515 vap->va_rdev = NODEV; 1516 vap->va_filerev = 0; 1517 vap->va_bsdflags = 0; 1518 1519 error = VOP_GETATTR(vp, vap, a->a_active_cred); 1520 if (error) 1521 goto out; 1522 1523 /* 1524 * Zero the spare stat fields 1525 */ 1526 bzero(sb, sizeof *sb); 1527 1528 /* 1529 * Copy from vattr table 1530 */ 1531 if (vap->va_fsid != VNOVAL) 1532 sb->st_dev = vap->va_fsid; 1533 else 1534 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 1535 sb->st_ino = vap->va_fileid; 1536 mode = vap->va_mode; 1537 switch (vap->va_type) { 1538 case VREG: 1539 mode |= S_IFREG; 1540 break; 1541 case VDIR: 1542 mode |= S_IFDIR; 1543 break; 1544 case VBLK: 1545 mode |= S_IFBLK; 1546 break; 1547 case VCHR: 1548 mode |= S_IFCHR; 1549 break; 1550 case VLNK: 1551 mode |= S_IFLNK; 1552 break; 1553 case VSOCK: 1554 mode |= S_IFSOCK; 1555 break; 1556 case VFIFO: 1557 mode |= S_IFIFO; 1558 break; 1559 default: 1560 error = EBADF; 1561 goto out; 1562 } 1563 sb->st_mode = mode; 1564 sb->st_nlink = vap->va_nlink; 1565 sb->st_uid = vap->va_uid; 1566 sb->st_gid = vap->va_gid; 1567 sb->st_rdev = vap->va_rdev; 1568 if (vap->va_size > OFF_MAX) { 1569 error = EOVERFLOW; 1570 goto out; 1571 } 1572 sb->st_size = vap->va_size; 1573 sb->st_atim.tv_sec = vap->va_atime.tv_sec; 1574 sb->st_atim.tv_nsec = vap->va_atime.tv_nsec; 1575 sb->st_mtim.tv_sec = vap->va_mtime.tv_sec; 1576 sb->st_mtim.tv_nsec = vap->va_mtime.tv_nsec; 1577 sb->st_ctim.tv_sec = vap->va_ctime.tv_sec; 1578 sb->st_ctim.tv_nsec = vap->va_ctime.tv_nsec; 1579 sb->st_birthtim.tv_sec = vap->va_birthtime.tv_sec; 1580 sb->st_birthtim.tv_nsec = vap->va_birthtime.tv_nsec; 1581 1582 /* 1583 * According to www.opengroup.org, the meaning of st_blksize is 1584 * "a filesystem-specific preferred I/O block size for this 1585 * object. In some filesystem types, this may vary from file 1586 * to file" 1587 * Use minimum/default of PAGE_SIZE (e.g. for VCHR). 1588 */ 1589 1590 sb->st_blksize = max(PAGE_SIZE, vap->va_blocksize); 1591 sb->st_flags = vap->va_flags; 1592 sb->st_blocks = vap->va_bytes / S_BLKSIZE; 1593 sb->st_gen = vap->va_gen; 1594 sb->st_filerev = vap->va_filerev; 1595 sb->st_bsdflags = vap->va_bsdflags; 1596 out: 1597 return (vop_stat_helper_post(a, error)); 1598 } 1599 1600 static int 1601 vop_stdread_pgcache(struct vop_read_pgcache_args *ap __unused) 1602 { 1603 return (EJUSTRETURN); 1604 } 1605 1606 static int 1607 vop_stdvput_pair(struct vop_vput_pair_args *ap) 1608 { 1609 struct vnode *dvp, *vp, **vpp; 1610 1611 dvp = ap->a_dvp; 1612 vpp = ap->a_vpp; 1613 vput(dvp); 1614 if (vpp != NULL && ap->a_unlock_vp && (vp = *vpp) != NULL) 1615 vput(vp); 1616 return (0); 1617 } 1618 1619 static int 1620 vop_stdgetlowvnode(struct vop_getlowvnode_args *ap) 1621 { 1622 vref(ap->a_vp); 1623 *ap->a_vplp = ap->a_vp; 1624 return (0); 1625 } 1626