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 * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/bio.h> 43 #include <sys/buf.h> 44 #include <sys/conf.h> 45 #include <sys/event.h> 46 #include <sys/filio.h> 47 #include <sys/kernel.h> 48 #include <sys/limits.h> 49 #include <sys/lock.h> 50 #include <sys/lockf.h> 51 #include <sys/malloc.h> 52 #include <sys/mount.h> 53 #include <sys/namei.h> 54 #include <sys/rwlock.h> 55 #include <sys/fcntl.h> 56 #include <sys/unistd.h> 57 #include <sys/vnode.h> 58 #include <sys/dirent.h> 59 #include <sys/poll.h> 60 #include <sys/stat.h> 61 #include <security/audit/audit.h> 62 #include <sys/priv.h> 63 64 #include <security/mac/mac_framework.h> 65 66 #include <vm/vm.h> 67 #include <vm/vm_object.h> 68 #include <vm/vm_extern.h> 69 #include <vm/pmap.h> 70 #include <vm/vm_map.h> 71 #include <vm/vm_page.h> 72 #include <vm/vm_pager.h> 73 #include <vm/vnode_pager.h> 74 75 static int vop_nolookup(struct vop_lookup_args *); 76 static int vop_norename(struct vop_rename_args *); 77 static int vop_nostrategy(struct vop_strategy_args *); 78 static int dirent_exists(struct vnode *vp, const char *dirname, 79 struct thread *td); 80 81 static int vop_stdis_text(struct vop_is_text_args *ap); 82 static int vop_stdunset_text(struct vop_unset_text_args *ap); 83 static int vop_stdadd_writecount(struct vop_add_writecount_args *ap); 84 static int vop_stdcopy_file_range(struct vop_copy_file_range_args *ap); 85 static int vop_stdfdatasync(struct vop_fdatasync_args *ap); 86 static int vop_stdgetpages_async(struct vop_getpages_async_args *ap); 87 static int vop_stdread_pgcache(struct vop_read_pgcache_args *ap); 88 static int vop_stdstat(struct vop_stat_args *ap); 89 static int vop_stdvput_pair(struct vop_vput_pair_args *ap); 90 91 /* 92 * This vnode table stores what we want to do if the filesystem doesn't 93 * implement a particular VOP. 94 * 95 * If there is no specific entry here, we will return EOPNOTSUPP. 96 * 97 * Note that every filesystem has to implement either vop_access 98 * or vop_accessx; failing to do so will result in immediate crash 99 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(), 100 * which calls vop_stdaccess() etc. 101 */ 102 103 struct vop_vector default_vnodeops = { 104 .vop_default = NULL, 105 .vop_bypass = VOP_EOPNOTSUPP, 106 107 .vop_access = vop_stdaccess, 108 .vop_accessx = vop_stdaccessx, 109 .vop_advise = vop_stdadvise, 110 .vop_advlock = vop_stdadvlock, 111 .vop_advlockasync = vop_stdadvlockasync, 112 .vop_advlockpurge = vop_stdadvlockpurge, 113 .vop_allocate = vop_stdallocate, 114 .vop_deallocate = vop_stddeallocate, 115 .vop_bmap = vop_stdbmap, 116 .vop_close = VOP_NULL, 117 .vop_fsync = VOP_NULL, 118 .vop_stat = vop_stdstat, 119 .vop_fdatasync = vop_stdfdatasync, 120 .vop_getpages = vop_stdgetpages, 121 .vop_getpages_async = vop_stdgetpages_async, 122 .vop_getwritemount = vop_stdgetwritemount, 123 .vop_inactive = VOP_NULL, 124 .vop_need_inactive = vop_stdneed_inactive, 125 .vop_ioctl = vop_stdioctl, 126 .vop_kqfilter = vop_stdkqfilter, 127 .vop_islocked = vop_stdislocked, 128 .vop_lock1 = vop_stdlock, 129 .vop_lookup = vop_nolookup, 130 .vop_open = VOP_NULL, 131 .vop_pathconf = VOP_EINVAL, 132 .vop_poll = vop_nopoll, 133 .vop_putpages = vop_stdputpages, 134 .vop_readlink = VOP_EINVAL, 135 .vop_read_pgcache = vop_stdread_pgcache, 136 .vop_rename = vop_norename, 137 .vop_revoke = VOP_PANIC, 138 .vop_strategy = vop_nostrategy, 139 .vop_unlock = vop_stdunlock, 140 .vop_vptocnp = vop_stdvptocnp, 141 .vop_vptofh = vop_stdvptofh, 142 .vop_unp_bind = vop_stdunp_bind, 143 .vop_unp_connect = vop_stdunp_connect, 144 .vop_unp_detach = vop_stdunp_detach, 145 .vop_is_text = vop_stdis_text, 146 .vop_set_text = vop_stdset_text, 147 .vop_unset_text = vop_stdunset_text, 148 .vop_add_writecount = vop_stdadd_writecount, 149 .vop_copy_file_range = vop_stdcopy_file_range, 150 .vop_vput_pair = vop_stdvput_pair, 151 }; 152 VFS_VOP_VECTOR_REGISTER(default_vnodeops); 153 154 /* 155 * Series of placeholder functions for various error returns for 156 * VOPs. 157 */ 158 159 int 160 vop_eopnotsupp(struct vop_generic_args *ap) 161 { 162 /* 163 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 164 */ 165 166 return (EOPNOTSUPP); 167 } 168 169 int 170 vop_ebadf(struct vop_generic_args *ap) 171 { 172 173 return (EBADF); 174 } 175 176 int 177 vop_enotty(struct vop_generic_args *ap) 178 { 179 180 return (ENOTTY); 181 } 182 183 int 184 vop_einval(struct vop_generic_args *ap) 185 { 186 187 return (EINVAL); 188 } 189 190 int 191 vop_enoent(struct vop_generic_args *ap) 192 { 193 194 return (ENOENT); 195 } 196 197 int 198 vop_eagain(struct vop_generic_args *ap) 199 { 200 201 return (EAGAIN); 202 } 203 204 int 205 vop_null(struct vop_generic_args *ap) 206 { 207 208 return (0); 209 } 210 211 /* 212 * Helper function to panic on some bad VOPs in some filesystems. 213 */ 214 int 215 vop_panic(struct vop_generic_args *ap) 216 { 217 218 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 219 } 220 221 /* 222 * vop_std<something> and vop_no<something> are default functions for use by 223 * filesystems that need the "default reasonable" implementation for a 224 * particular operation. 225 * 226 * The documentation for the operations they implement exists (if it exists) 227 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 228 */ 229 230 /* 231 * Default vop for filesystems that do not support name lookup 232 */ 233 static int 234 vop_nolookup(struct vop_lookup_args *ap) 235 { 236 237 *ap->a_vpp = NULL; 238 return (ENOTDIR); 239 } 240 241 /* 242 * vop_norename: 243 * 244 * Handle unlock and reference counting for arguments of vop_rename 245 * for filesystems that do not implement rename operation. 246 */ 247 static int 248 vop_norename(struct vop_rename_args *ap) 249 { 250 251 vop_rename_fail(ap); 252 return (EOPNOTSUPP); 253 } 254 255 /* 256 * vop_nostrategy: 257 * 258 * Strategy routine for VFS devices that have none. 259 * 260 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 261 * routine. Typically this is done for a BIO_READ strategy call. 262 * Typically B_INVAL is assumed to already be clear prior to a write 263 * and should not be cleared manually unless you just made the buffer 264 * invalid. BIO_ERROR should be cleared either way. 265 */ 266 267 static int 268 vop_nostrategy (struct vop_strategy_args *ap) 269 { 270 printf("No strategy for buffer at %p\n", ap->a_bp); 271 vn_printf(ap->a_vp, "vnode "); 272 ap->a_bp->b_ioflags |= BIO_ERROR; 273 ap->a_bp->b_error = EOPNOTSUPP; 274 bufdone(ap->a_bp); 275 return (EOPNOTSUPP); 276 } 277 278 /* 279 * Check if a named file exists in a given directory vnode 280 * 281 * Returns 0 if the file exists, ENOENT if it doesn't, or errors returned by 282 * vn_dir_next_dirent(). 283 */ 284 static int 285 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 286 { 287 char *dirbuf; 288 int error, eofflag; 289 size_t dirbuflen, len; 290 off_t off; 291 struct dirent *dp; 292 struct vattr va; 293 294 ASSERT_VOP_LOCKED(vp, "vnode not locked"); 295 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 296 297 error = VOP_GETATTR(vp, &va, td->td_ucred); 298 if (error != 0) 299 return (error); 300 301 dirbuflen = MAX(DEV_BSIZE, GENERIC_MAXDIRSIZ); 302 if (dirbuflen < va.va_blocksize) 303 dirbuflen = va.va_blocksize; 304 dirbuf = malloc(dirbuflen, M_TEMP, M_WAITOK); 305 306 len = 0; 307 off = 0; 308 eofflag = 0; 309 310 for (;;) { 311 error = vn_dir_next_dirent(vp, td, dirbuf, dirbuflen, 312 &dp, &len, &off, &eofflag); 313 if (error != 0) 314 goto out; 315 316 if (len == 0) 317 break; 318 319 if (dp->d_type != DT_WHT && dp->d_fileno != 0 && 320 strcmp(dp->d_name, dirname) == 0) 321 goto out; 322 } 323 324 error = ENOENT; 325 326 out: 327 free(dirbuf, M_TEMP); 328 return (error); 329 } 330 331 int 332 vop_stdaccess(struct vop_access_args *ap) 333 { 334 335 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | 336 VAPPEND)) == 0, ("invalid bit in accmode")); 337 338 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td)); 339 } 340 341 int 342 vop_stdaccessx(struct vop_accessx_args *ap) 343 { 344 int error; 345 accmode_t accmode = ap->a_accmode; 346 347 error = vfs_unixify_accmode(&accmode); 348 if (error != 0) 349 return (error); 350 351 if (accmode == 0) 352 return (0); 353 354 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 355 } 356 357 /* 358 * Advisory record locking support 359 */ 360 int 361 vop_stdadvlock(struct vop_advlock_args *ap) 362 { 363 struct vnode *vp; 364 struct mount *mp; 365 struct vattr vattr; 366 int error; 367 368 vp = ap->a_vp; 369 370 /* 371 * Provide atomicity of open(O_CREAT | O_EXCL | O_EXLOCK) for 372 * local filesystems. See vn_open_cred() for reciprocal part. 373 */ 374 mp = vp->v_mount; 375 if (mp != NULL && (mp->mnt_flag & MNT_LOCAL) != 0 && 376 ap->a_op == F_SETLK && (ap->a_flags & F_FIRSTOPEN) == 0) { 377 VI_LOCK(vp); 378 while ((vp->v_iflag & VI_FOPENING) != 0) 379 msleep(vp, VI_MTX(vp), PLOCK, "lockfo", 0); 380 VI_UNLOCK(vp); 381 } 382 383 if (ap->a_fl->l_whence == SEEK_END) { 384 /* 385 * The NFSv4 server must avoid doing a vn_lock() here, since it 386 * can deadlock the nfsd threads, due to a LOR. Fortunately 387 * the NFSv4 server always uses SEEK_SET and this code is 388 * only required for the SEEK_END case. 389 */ 390 vn_lock(vp, LK_SHARED | LK_RETRY); 391 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 392 VOP_UNLOCK(vp); 393 if (error) 394 return (error); 395 } else 396 vattr.va_size = 0; 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 vattr vattr; 406 int error; 407 408 vp = ap->a_vp; 409 if (ap->a_fl->l_whence == SEEK_END) { 410 /* The size argument is only needed for SEEK_END. */ 411 vn_lock(vp, LK_SHARED | LK_RETRY); 412 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 413 VOP_UNLOCK(vp); 414 if (error) 415 return (error); 416 } else 417 vattr.va_size = 0; 418 419 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 420 } 421 422 int 423 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap) 424 { 425 struct vnode *vp; 426 427 vp = ap->a_vp; 428 lf_purgelocks(vp, &vp->v_lockf); 429 return (0); 430 } 431 432 /* 433 * vop_stdpathconf: 434 * 435 * Standard implementation of POSIX pathconf, to get information about limits 436 * for a filesystem. 437 * Override per filesystem for the case where the filesystem has smaller 438 * limits. 439 */ 440 int 441 vop_stdpathconf(struct vop_pathconf_args *ap) 442 { 443 444 switch (ap->a_name) { 445 case _PC_ASYNC_IO: 446 *ap->a_retval = _POSIX_ASYNCHRONOUS_IO; 447 return (0); 448 case _PC_PATH_MAX: 449 *ap->a_retval = PATH_MAX; 450 return (0); 451 case _PC_ACL_EXTENDED: 452 case _PC_ACL_NFS4: 453 case _PC_CAP_PRESENT: 454 case _PC_DEALLOC_PRESENT: 455 case _PC_INF_PRESENT: 456 case _PC_MAC_PRESENT: 457 *ap->a_retval = 0; 458 return (0); 459 default: 460 return (EINVAL); 461 } 462 /* NOTREACHED */ 463 } 464 465 /* 466 * Standard lock, unlock and islocked functions. 467 */ 468 int 469 vop_stdlock(struct vop_lock1_args *ap) 470 { 471 struct vnode *vp = ap->a_vp; 472 struct mtx *ilk; 473 474 ilk = VI_MTX(vp); 475 return (lockmgr_lock_flags(vp->v_vnlock, ap->a_flags, 476 &ilk->lock_object, ap->a_file, ap->a_line)); 477 } 478 479 /* See above. */ 480 int 481 vop_stdunlock(struct vop_unlock_args *ap) 482 { 483 struct vnode *vp = ap->a_vp; 484 485 return (lockmgr_unlock(vp->v_vnlock)); 486 } 487 488 /* See above. */ 489 int 490 vop_stdislocked(struct vop_islocked_args *ap) 491 { 492 493 return (lockstatus(ap->a_vp->v_vnlock)); 494 } 495 496 /* 497 * Variants of the above set. 498 * 499 * Differences are: 500 * - shared locking disablement is not supported 501 * - v_vnlock pointer is not honored 502 */ 503 int 504 vop_lock(struct vop_lock1_args *ap) 505 { 506 struct vnode *vp = ap->a_vp; 507 int flags = ap->a_flags; 508 struct mtx *ilk; 509 510 MPASS(vp->v_vnlock == &vp->v_lock); 511 512 if (__predict_false((flags & ~(LK_TYPE_MASK | LK_NODDLKTREAT | LK_RETRY)) != 0)) 513 goto other; 514 515 switch (flags & LK_TYPE_MASK) { 516 case LK_SHARED: 517 return (lockmgr_slock(&vp->v_lock, flags, ap->a_file, ap->a_line)); 518 case LK_EXCLUSIVE: 519 return (lockmgr_xlock(&vp->v_lock, flags, ap->a_file, ap->a_line)); 520 } 521 other: 522 ilk = VI_MTX(vp); 523 return (lockmgr_lock_flags(&vp->v_lock, flags, 524 &ilk->lock_object, ap->a_file, ap->a_line)); 525 } 526 527 int 528 vop_unlock(struct vop_unlock_args *ap) 529 { 530 struct vnode *vp = ap->a_vp; 531 532 MPASS(vp->v_vnlock == &vp->v_lock); 533 534 return (lockmgr_unlock(&vp->v_lock)); 535 } 536 537 int 538 vop_islocked(struct vop_islocked_args *ap) 539 { 540 struct vnode *vp = ap->a_vp; 541 542 MPASS(vp->v_vnlock == &vp->v_lock); 543 544 return (lockstatus(&vp->v_lock)); 545 } 546 547 /* 548 * Return true for select/poll. 549 */ 550 int 551 vop_nopoll(struct vop_poll_args *ap) 552 { 553 554 if (ap->a_events & ~POLLSTANDARD) 555 return (POLLNVAL); 556 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 557 } 558 559 /* 560 * Implement poll for local filesystems that support it. 561 */ 562 int 563 vop_stdpoll(struct vop_poll_args *ap) 564 { 565 if (ap->a_events & ~POLLSTANDARD) 566 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 567 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 568 } 569 570 /* 571 * Return our mount point, as we will take charge of the writes. 572 */ 573 int 574 vop_stdgetwritemount(struct vop_getwritemount_args *ap) 575 { 576 struct mount *mp; 577 struct vnode *vp; 578 579 /* 580 * Note that having a reference does not prevent forced unmount from 581 * setting ->v_mount to NULL after the lock gets released. This is of 582 * no consequence for typical consumers (most notably vn_start_write) 583 * since in this case the vnode is VIRF_DOOMED. Unmount might have 584 * progressed far enough that its completion is only delayed by the 585 * reference obtained here. The consumer only needs to concern itself 586 * with releasing it. 587 */ 588 vp = ap->a_vp; 589 mp = vfs_ref_from_vp(vp); 590 *(ap->a_mpp) = mp; 591 return (0); 592 } 593 594 /* 595 * If the file system doesn't implement VOP_BMAP, then return sensible defaults: 596 * - Return the vnode's bufobj instead of any underlying device's bufobj 597 * - Calculate the physical block number as if there were equal size 598 * consecutive blocks, but 599 * - Report no contiguous runs of blocks. 600 */ 601 int 602 vop_stdbmap(struct vop_bmap_args *ap) 603 { 604 605 if (ap->a_bop != NULL) 606 *ap->a_bop = &ap->a_vp->v_bufobj; 607 if (ap->a_bnp != NULL) 608 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 609 if (ap->a_runp != NULL) 610 *ap->a_runp = 0; 611 if (ap->a_runb != NULL) 612 *ap->a_runb = 0; 613 return (0); 614 } 615 616 int 617 vop_stdfsync(struct vop_fsync_args *ap) 618 { 619 620 return (vn_fsync_buf(ap->a_vp, ap->a_waitfor)); 621 } 622 623 static int 624 vop_stdfdatasync(struct vop_fdatasync_args *ap) 625 { 626 627 return (VOP_FSYNC(ap->a_vp, MNT_WAIT, ap->a_td)); 628 } 629 630 int 631 vop_stdfdatasync_buf(struct vop_fdatasync_args *ap) 632 { 633 634 return (vn_fsync_buf(ap->a_vp, MNT_WAIT)); 635 } 636 637 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 638 int 639 vop_stdgetpages(struct vop_getpages_args *ap) 640 { 641 642 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 643 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL); 644 } 645 646 static int 647 vop_stdgetpages_async(struct vop_getpages_async_args *ap) 648 { 649 int error; 650 651 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind, 652 ap->a_rahead); 653 if (ap->a_iodone != NULL) 654 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error); 655 return (error); 656 } 657 658 int 659 vop_stdkqfilter(struct vop_kqfilter_args *ap) 660 { 661 return vfs_kqfilter(ap); 662 } 663 664 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 665 int 666 vop_stdputpages(struct vop_putpages_args *ap) 667 { 668 669 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 670 ap->a_sync, ap->a_rtvals); 671 } 672 673 int 674 vop_stdvptofh(struct vop_vptofh_args *ap) 675 { 676 return (EOPNOTSUPP); 677 } 678 679 int 680 vop_stdvptocnp(struct vop_vptocnp_args *ap) 681 { 682 struct vnode *const vp = ap->a_vp; 683 struct vnode **const dvp = ap->a_vpp; 684 char *buf = ap->a_buf; 685 size_t *buflen = ap->a_buflen; 686 char *dirbuf; 687 int i = *buflen; 688 int error = 0, covered = 0; 689 int eofflag, flags, locked; 690 size_t dirbuflen, len; 691 off_t off; 692 ino_t fileno; 693 struct vattr va; 694 struct nameidata nd; 695 struct thread *const td = curthread; 696 struct ucred *const cred = td->td_ucred; 697 struct dirent *dp; 698 struct vnode *mvp; 699 700 if (vp->v_type != VDIR) 701 return (ENOENT); 702 703 error = VOP_GETATTR(vp, &va, cred); 704 if (error) 705 return (error); 706 707 VREF(vp); 708 locked = VOP_ISLOCKED(vp); 709 VOP_UNLOCK(vp); 710 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE, 711 "..", vp); 712 flags = FREAD; 713 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 714 if (error) { 715 vn_lock(vp, locked | LK_RETRY); 716 return (error); 717 } 718 NDFREE_PNBUF(&nd); 719 720 mvp = *dvp = nd.ni_vp; 721 722 if (vp->v_mount != (*dvp)->v_mount && 723 ((*dvp)->v_vflag & VV_ROOT) && 724 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 725 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 726 VREF(mvp); 727 VOP_UNLOCK(mvp); 728 vn_close(mvp, FREAD, cred, td); 729 VREF(*dvp); 730 vn_lock(*dvp, LK_SHARED | LK_RETRY); 731 covered = 1; 732 } 733 734 fileno = va.va_fileid; 735 736 dirbuflen = MAX(DEV_BSIZE, GENERIC_MAXDIRSIZ); 737 if (dirbuflen < va.va_blocksize) 738 dirbuflen = va.va_blocksize; 739 dirbuf = malloc(dirbuflen, M_TEMP, M_WAITOK); 740 741 if ((*dvp)->v_type != VDIR) { 742 error = ENOENT; 743 goto out; 744 } 745 746 len = 0; 747 off = 0; 748 eofflag = 0; 749 750 for (;;) { 751 /* call VOP_READDIR of parent */ 752 error = vn_dir_next_dirent(*dvp, td, 753 dirbuf, dirbuflen, &dp, &len, &off, &eofflag); 754 if (error != 0) 755 goto out; 756 757 if (len == 0) { 758 error = ENOENT; 759 goto out; 760 } 761 762 if ((dp->d_type != DT_WHT) && 763 (dp->d_fileno == fileno)) { 764 if (covered) { 765 VOP_UNLOCK(*dvp); 766 vn_lock(mvp, LK_SHARED | LK_RETRY); 767 if (dirent_exists(mvp, dp->d_name, td) == 0) { 768 error = ENOENT; 769 VOP_UNLOCK(mvp); 770 vn_lock(*dvp, LK_SHARED | LK_RETRY); 771 goto out; 772 } 773 VOP_UNLOCK(mvp); 774 vn_lock(*dvp, LK_SHARED | LK_RETRY); 775 } 776 i -= dp->d_namlen; 777 778 if (i < 0) { 779 error = ENOMEM; 780 goto out; 781 } 782 if (dp->d_namlen == 1 && dp->d_name[0] == '.') { 783 error = ENOENT; 784 } else { 785 bcopy(dp->d_name, buf + i, dp->d_namlen); 786 error = 0; 787 } 788 goto out; 789 } 790 } 791 792 out: 793 free(dirbuf, M_TEMP); 794 if (!error) { 795 *buflen = i; 796 vref(*dvp); 797 } 798 if (covered) { 799 vput(*dvp); 800 vrele(mvp); 801 } else { 802 VOP_UNLOCK(mvp); 803 vn_close(mvp, FREAD, cred, td); 804 } 805 vn_lock(vp, locked | LK_RETRY); 806 return (error); 807 } 808 809 int 810 vop_stdallocate(struct vop_allocate_args *ap) 811 { 812 #ifdef __notyet__ 813 struct statfs *sfs; 814 off_t maxfilesize = 0; 815 #endif 816 struct iovec aiov; 817 struct vattr vattr, *vap; 818 struct uio auio; 819 off_t fsize, len, cur, offset; 820 uint8_t *buf; 821 struct thread *td; 822 struct vnode *vp; 823 size_t iosize; 824 int error; 825 826 buf = NULL; 827 error = 0; 828 td = curthread; 829 vap = &vattr; 830 vp = ap->a_vp; 831 len = *ap->a_len; 832 offset = *ap->a_offset; 833 834 error = VOP_GETATTR(vp, vap, ap->a_cred); 835 if (error != 0) 836 goto out; 837 fsize = vap->va_size; 838 iosize = vap->va_blocksize; 839 if (iosize == 0) 840 iosize = BLKDEV_IOSIZE; 841 if (iosize > maxphys) 842 iosize = maxphys; 843 buf = malloc(iosize, M_TEMP, M_WAITOK); 844 845 #ifdef __notyet__ 846 /* 847 * Check if the filesystem sets f_maxfilesize; if not use 848 * VOP_SETATTR to perform the check. 849 */ 850 sfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 851 error = VFS_STATFS(vp->v_mount, sfs, td); 852 if (error == 0) 853 maxfilesize = sfs->f_maxfilesize; 854 free(sfs, M_STATFS); 855 if (error != 0) 856 goto out; 857 if (maxfilesize) { 858 if (offset > maxfilesize || len > maxfilesize || 859 offset + len > maxfilesize) { 860 error = EFBIG; 861 goto out; 862 } 863 } else 864 #endif 865 if (offset + len > vap->va_size) { 866 /* 867 * Test offset + len against the filesystem's maxfilesize. 868 */ 869 VATTR_NULL(vap); 870 vap->va_size = offset + len; 871 error = VOP_SETATTR(vp, vap, ap->a_cred); 872 if (error != 0) 873 goto out; 874 VATTR_NULL(vap); 875 vap->va_size = fsize; 876 error = VOP_SETATTR(vp, vap, ap->a_cred); 877 if (error != 0) 878 goto out; 879 } 880 881 for (;;) { 882 /* 883 * Read and write back anything below the nominal file 884 * size. There's currently no way outside the filesystem 885 * to know whether this area is sparse or not. 886 */ 887 cur = iosize; 888 if ((offset % iosize) != 0) 889 cur -= (offset % iosize); 890 if (cur > len) 891 cur = len; 892 if (offset < fsize) { 893 aiov.iov_base = buf; 894 aiov.iov_len = cur; 895 auio.uio_iov = &aiov; 896 auio.uio_iovcnt = 1; 897 auio.uio_offset = offset; 898 auio.uio_resid = cur; 899 auio.uio_segflg = UIO_SYSSPACE; 900 auio.uio_rw = UIO_READ; 901 auio.uio_td = td; 902 error = VOP_READ(vp, &auio, ap->a_ioflag, ap->a_cred); 903 if (error != 0) 904 break; 905 if (auio.uio_resid > 0) { 906 bzero(buf + cur - auio.uio_resid, 907 auio.uio_resid); 908 } 909 } else { 910 bzero(buf, cur); 911 } 912 913 aiov.iov_base = buf; 914 aiov.iov_len = cur; 915 auio.uio_iov = &aiov; 916 auio.uio_iovcnt = 1; 917 auio.uio_offset = offset; 918 auio.uio_resid = cur; 919 auio.uio_segflg = UIO_SYSSPACE; 920 auio.uio_rw = UIO_WRITE; 921 auio.uio_td = td; 922 923 error = VOP_WRITE(vp, &auio, ap->a_ioflag, ap->a_cred); 924 if (error != 0) 925 break; 926 927 len -= cur; 928 offset += cur; 929 if (len == 0) 930 break; 931 if (should_yield()) 932 break; 933 } 934 935 out: 936 *ap->a_len = len; 937 *ap->a_offset = offset; 938 free(buf, M_TEMP); 939 return (error); 940 } 941 942 static int 943 vp_zerofill(struct vnode *vp, struct vattr *vap, off_t *offsetp, off_t *lenp, 944 int ioflag, struct ucred *cred) 945 { 946 int iosize; 947 int error = 0; 948 struct iovec aiov; 949 struct uio auio; 950 struct thread *td; 951 off_t offset, len; 952 953 iosize = vap->va_blocksize; 954 td = curthread; 955 offset = *offsetp; 956 len = *lenp; 957 958 if (iosize == 0) 959 iosize = BLKDEV_IOSIZE; 960 /* If va_blocksize is 512 bytes, iosize will be 4 kilobytes */ 961 iosize = min(iosize * 8, ZERO_REGION_SIZE); 962 963 while (len > 0) { 964 int xfersize = iosize; 965 if (offset % iosize != 0) 966 xfersize -= offset % iosize; 967 if (xfersize > len) 968 xfersize = len; 969 970 aiov.iov_base = __DECONST(void *, zero_region); 971 aiov.iov_len = xfersize; 972 auio.uio_iov = &aiov; 973 auio.uio_iovcnt = 1; 974 auio.uio_offset = offset; 975 auio.uio_resid = xfersize; 976 auio.uio_segflg = UIO_SYSSPACE; 977 auio.uio_rw = UIO_WRITE; 978 auio.uio_td = td; 979 980 error = VOP_WRITE(vp, &auio, ioflag, cred); 981 if (error != 0) { 982 len -= xfersize - auio.uio_resid; 983 offset += xfersize - auio.uio_resid; 984 break; 985 } 986 987 len -= xfersize; 988 offset += xfersize; 989 } 990 991 *offsetp = offset; 992 *lenp = len; 993 return (error); 994 } 995 996 int 997 vop_stddeallocate(struct vop_deallocate_args *ap) 998 { 999 struct vnode *vp; 1000 off_t offset, len; 1001 struct ucred *cred; 1002 int error; 1003 struct vattr va; 1004 off_t noff, xfersize, rem; 1005 1006 vp = ap->a_vp; 1007 offset = *ap->a_offset; 1008 cred = ap->a_cred; 1009 1010 error = VOP_GETATTR(vp, &va, cred); 1011 if (error) 1012 return (error); 1013 1014 len = omin((off_t)va.va_size - offset, *ap->a_len); 1015 while (len > 0) { 1016 noff = offset; 1017 error = vn_bmap_seekhole_locked(vp, FIOSEEKDATA, &noff, cred); 1018 if (error) { 1019 if (error != ENXIO) 1020 /* XXX: Is it okay to fallback further? */ 1021 goto out; 1022 1023 /* 1024 * No more data region to be filled 1025 */ 1026 offset += len; 1027 len = 0; 1028 error = 0; 1029 break; 1030 } 1031 KASSERT(noff >= offset, ("FIOSEEKDATA going backward")); 1032 if (noff != offset) { 1033 xfersize = omin(noff - offset, len); 1034 len -= xfersize; 1035 offset += xfersize; 1036 if (len == 0) 1037 break; 1038 } 1039 error = vn_bmap_seekhole_locked(vp, FIOSEEKHOLE, &noff, cred); 1040 if (error) 1041 goto out; 1042 1043 /* Fill zeroes */ 1044 xfersize = rem = omin(noff - offset, len); 1045 error = vp_zerofill(vp, &va, &offset, &rem, ap->a_ioflag, cred); 1046 if (error) { 1047 len -= xfersize - rem; 1048 goto out; 1049 } 1050 1051 len -= xfersize; 1052 if (should_yield()) 1053 break; 1054 } 1055 /* Handle the case when offset is beyond EOF */ 1056 if (len < 0) 1057 len = 0; 1058 out: 1059 *ap->a_offset = offset; 1060 *ap->a_len = len; 1061 return (error); 1062 } 1063 1064 int 1065 vop_stdadvise(struct vop_advise_args *ap) 1066 { 1067 struct vnode *vp; 1068 struct bufobj *bo; 1069 daddr_t startn, endn; 1070 off_t bstart, bend, start, end; 1071 int bsize, error; 1072 1073 vp = ap->a_vp; 1074 switch (ap->a_advice) { 1075 case POSIX_FADV_WILLNEED: 1076 /* 1077 * Do nothing for now. Filesystems should provide a 1078 * custom method which starts an asynchronous read of 1079 * the requested region. 1080 */ 1081 error = 0; 1082 break; 1083 case POSIX_FADV_DONTNEED: 1084 error = 0; 1085 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1086 if (VN_IS_DOOMED(vp)) { 1087 VOP_UNLOCK(vp); 1088 break; 1089 } 1090 1091 /* 1092 * Round to block boundaries (and later possibly further to 1093 * page boundaries). Applications cannot reasonably be aware 1094 * of the boundaries, and the rounding must be to expand at 1095 * both extremities to cover enough. It still doesn't cover 1096 * read-ahead. For partial blocks, this gives unnecessary 1097 * discarding of buffers but is efficient enough since the 1098 * pages usually remain in VMIO for some time. 1099 */ 1100 bsize = vp->v_bufobj.bo_bsize; 1101 bstart = rounddown(ap->a_start, bsize); 1102 bend = roundup(ap->a_end, 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 start = trunc_page(bstart); 1112 end = round_page(bend); 1113 VM_OBJECT_RLOCK(vp->v_object); 1114 vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start), 1115 OFF_TO_IDX(end)); 1116 VM_OBJECT_RUNLOCK(vp->v_object); 1117 } 1118 1119 bo = &vp->v_bufobj; 1120 BO_RLOCK(bo); 1121 startn = bstart / bsize; 1122 endn = bend / bsize; 1123 error = bnoreuselist(&bo->bo_clean, bo, startn, endn); 1124 if (error == 0) 1125 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn); 1126 BO_RUNLOCK(bo); 1127 VOP_UNLOCK(vp); 1128 break; 1129 default: 1130 error = EINVAL; 1131 break; 1132 } 1133 return (error); 1134 } 1135 1136 int 1137 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1138 { 1139 1140 ap->a_vp->v_unpcb = ap->a_unpcb; 1141 return (0); 1142 } 1143 1144 int 1145 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1146 { 1147 1148 *ap->a_unpcb = ap->a_vp->v_unpcb; 1149 return (0); 1150 } 1151 1152 int 1153 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1154 { 1155 1156 ap->a_vp->v_unpcb = NULL; 1157 return (0); 1158 } 1159 1160 static int 1161 vop_stdis_text(struct vop_is_text_args *ap) 1162 { 1163 1164 return (atomic_load_int(&ap->a_vp->v_writecount) < 0); 1165 } 1166 1167 int 1168 vop_stdset_text(struct vop_set_text_args *ap) 1169 { 1170 struct vnode *vp; 1171 int n; 1172 bool gotref; 1173 1174 vp = ap->a_vp; 1175 1176 n = atomic_load_int(&vp->v_writecount); 1177 for (;;) { 1178 if (__predict_false(n > 0)) { 1179 return (ETXTBSY); 1180 } 1181 1182 /* 1183 * Transition point, we may need to grab a reference on the vnode. 1184 * 1185 * Take the ref early As a safety measure against bogus calls 1186 * to vop_stdunset_text. 1187 */ 1188 if (n == 0) { 1189 gotref = false; 1190 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) { 1191 vref(vp); 1192 gotref = true; 1193 } 1194 if (atomic_fcmpset_int(&vp->v_writecount, &n, -1)) { 1195 return (0); 1196 } 1197 if (gotref) { 1198 vunref(vp); 1199 } 1200 continue; 1201 } 1202 1203 MPASS(n < 0); 1204 if (atomic_fcmpset_int(&vp->v_writecount, &n, n - 1)) { 1205 return (0); 1206 } 1207 } 1208 __assert_unreachable(); 1209 } 1210 1211 static int 1212 vop_stdunset_text(struct vop_unset_text_args *ap) 1213 { 1214 struct vnode *vp; 1215 int n; 1216 1217 vp = ap->a_vp; 1218 1219 n = atomic_load_int(&vp->v_writecount); 1220 for (;;) { 1221 if (__predict_false(n >= 0)) { 1222 return (EINVAL); 1223 } 1224 1225 /* 1226 * Transition point, we may need to release a reference on the vnode. 1227 */ 1228 if (n == -1) { 1229 if (atomic_fcmpset_int(&vp->v_writecount, &n, 0)) { 1230 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) { 1231 vunref(vp); 1232 } 1233 return (0); 1234 } 1235 continue; 1236 } 1237 1238 MPASS(n < -1); 1239 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + 1)) { 1240 return (0); 1241 } 1242 } 1243 __assert_unreachable(); 1244 } 1245 1246 static int __always_inline 1247 vop_stdadd_writecount_impl(struct vop_add_writecount_args *ap, bool handle_msync) 1248 { 1249 struct vnode *vp; 1250 struct mount *mp __diagused; 1251 int n; 1252 1253 vp = ap->a_vp; 1254 1255 #ifdef INVARIANTS 1256 mp = vp->v_mount; 1257 if (mp != NULL) { 1258 if (handle_msync) { 1259 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) == 0, vp); 1260 } else { 1261 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) != 0, vp); 1262 } 1263 } 1264 #endif 1265 1266 n = atomic_load_int(&vp->v_writecount); 1267 for (;;) { 1268 if (__predict_false(n < 0)) { 1269 return (ETXTBSY); 1270 } 1271 1272 VNASSERT(n + ap->a_inc >= 0, vp, 1273 ("neg writecount increment %d + %d = %d", n, ap->a_inc, 1274 n + ap->a_inc)); 1275 if (n == 0) { 1276 if (handle_msync) { 1277 vlazy(vp); 1278 } 1279 } 1280 1281 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + ap->a_inc)) { 1282 return (0); 1283 } 1284 } 1285 __assert_unreachable(); 1286 } 1287 1288 int 1289 vop_stdadd_writecount(struct vop_add_writecount_args *ap) 1290 { 1291 1292 return (vop_stdadd_writecount_impl(ap, true)); 1293 } 1294 1295 int 1296 vop_stdadd_writecount_nomsync(struct vop_add_writecount_args *ap) 1297 { 1298 1299 return (vop_stdadd_writecount_impl(ap, false)); 1300 } 1301 1302 int 1303 vop_stdneed_inactive(struct vop_need_inactive_args *ap) 1304 { 1305 1306 return (1); 1307 } 1308 1309 int 1310 vop_stdioctl(struct vop_ioctl_args *ap) 1311 { 1312 struct vnode *vp; 1313 struct vattr va; 1314 off_t *offp; 1315 int error; 1316 1317 switch (ap->a_command) { 1318 case FIOSEEKDATA: 1319 case FIOSEEKHOLE: 1320 vp = ap->a_vp; 1321 error = vn_lock(vp, LK_SHARED); 1322 if (error != 0) 1323 return (EBADF); 1324 if (vp->v_type == VREG) 1325 error = VOP_GETATTR(vp, &va, ap->a_cred); 1326 else 1327 error = ENOTTY; 1328 if (error == 0) { 1329 offp = ap->a_data; 1330 if (*offp < 0 || *offp >= va.va_size) 1331 error = ENXIO; 1332 else if (ap->a_command == FIOSEEKHOLE) 1333 *offp = va.va_size; 1334 } 1335 VOP_UNLOCK(vp); 1336 break; 1337 default: 1338 error = ENOTTY; 1339 break; 1340 } 1341 return (error); 1342 } 1343 1344 /* 1345 * vfs default ops 1346 * used to fill the vfs function table to get reasonable default return values. 1347 */ 1348 int 1349 vfs_stdroot(struct mount *mp, int flags, struct vnode **vpp) 1350 { 1351 1352 return (EOPNOTSUPP); 1353 } 1354 1355 int 1356 vfs_stdstatfs(struct mount *mp, struct statfs *sbp) 1357 { 1358 1359 return (EOPNOTSUPP); 1360 } 1361 1362 int 1363 vfs_stdquotactl(struct mount *mp, int cmds, uid_t uid, void *arg, bool *mp_busy) 1364 { 1365 return (EOPNOTSUPP); 1366 } 1367 1368 int 1369 vfs_stdsync(struct mount *mp, int waitfor) 1370 { 1371 struct vnode *vp, *mvp; 1372 struct thread *td; 1373 int error, lockreq, allerror = 0; 1374 1375 td = curthread; 1376 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1377 if (waitfor != MNT_WAIT) 1378 lockreq |= LK_NOWAIT; 1379 /* 1380 * Force stale buffer cache information to be flushed. 1381 */ 1382 loop: 1383 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1384 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1385 VI_UNLOCK(vp); 1386 continue; 1387 } 1388 if ((error = vget(vp, lockreq)) != 0) { 1389 if (error == ENOENT) { 1390 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1391 goto loop; 1392 } 1393 continue; 1394 } 1395 error = VOP_FSYNC(vp, waitfor, td); 1396 if (error) 1397 allerror = error; 1398 vput(vp); 1399 } 1400 return (allerror); 1401 } 1402 1403 int 1404 vfs_stdnosync(struct mount *mp, int waitfor) 1405 { 1406 1407 return (0); 1408 } 1409 1410 static int 1411 vop_stdcopy_file_range(struct vop_copy_file_range_args *ap) 1412 { 1413 int error; 1414 1415 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 1416 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, ap->a_incred, 1417 ap->a_outcred, ap->a_fsizetd); 1418 return (error); 1419 } 1420 1421 int 1422 vfs_stdvget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 1423 { 1424 1425 return (EOPNOTSUPP); 1426 } 1427 1428 int 1429 vfs_stdfhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1430 { 1431 1432 return (EOPNOTSUPP); 1433 } 1434 1435 int 1436 vfs_stdinit(struct vfsconf *vfsp) 1437 { 1438 1439 return (0); 1440 } 1441 1442 int 1443 vfs_stduninit(struct vfsconf *vfsp) 1444 { 1445 1446 return(0); 1447 } 1448 1449 int 1450 vfs_stdextattrctl(struct mount *mp, int cmd, struct vnode *filename_vp, 1451 int attrnamespace, const char *attrname) 1452 { 1453 1454 if (filename_vp != NULL) 1455 VOP_UNLOCK(filename_vp); 1456 return (EOPNOTSUPP); 1457 } 1458 1459 int 1460 vfs_stdsysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req) 1461 { 1462 1463 return (EOPNOTSUPP); 1464 } 1465 1466 static vop_bypass_t * 1467 bp_by_off(struct vop_vector *vop, struct vop_generic_args *a) 1468 { 1469 1470 return (*(vop_bypass_t **)((char *)vop + a->a_desc->vdesc_vop_offset)); 1471 } 1472 1473 int 1474 vop_sigdefer(struct vop_vector *vop, struct vop_generic_args *a) 1475 { 1476 vop_bypass_t *bp; 1477 int prev_stops, rc; 1478 1479 bp = bp_by_off(vop, a); 1480 MPASS(bp != NULL); 1481 1482 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT); 1483 rc = bp(a); 1484 sigallowstop(prev_stops); 1485 return (rc); 1486 } 1487 1488 static int 1489 vop_stdstat(struct vop_stat_args *a) 1490 { 1491 struct vattr vattr; 1492 struct vattr *vap; 1493 struct vnode *vp; 1494 struct stat *sb; 1495 int error; 1496 u_short mode; 1497 1498 vp = a->a_vp; 1499 sb = a->a_sb; 1500 1501 error = vop_stat_helper_pre(a); 1502 if (error != 0) 1503 return (error); 1504 1505 vap = &vattr; 1506 1507 /* 1508 * Initialize defaults for new and unusual fields, so that file 1509 * systems which don't support these fields don't need to know 1510 * about them. 1511 */ 1512 vap->va_birthtime.tv_sec = -1; 1513 vap->va_birthtime.tv_nsec = 0; 1514 vap->va_fsid = VNOVAL; 1515 vap->va_gen = 0; 1516 vap->va_rdev = NODEV; 1517 1518 error = VOP_GETATTR(vp, vap, a->a_active_cred); 1519 if (error) 1520 goto out; 1521 1522 /* 1523 * Zero the spare stat fields 1524 */ 1525 bzero(sb, sizeof *sb); 1526 1527 /* 1528 * Copy from vattr table 1529 */ 1530 if (vap->va_fsid != VNOVAL) 1531 sb->st_dev = vap->va_fsid; 1532 else 1533 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 1534 sb->st_ino = vap->va_fileid; 1535 mode = vap->va_mode; 1536 switch (vap->va_type) { 1537 case VREG: 1538 mode |= S_IFREG; 1539 break; 1540 case VDIR: 1541 mode |= S_IFDIR; 1542 break; 1543 case VBLK: 1544 mode |= S_IFBLK; 1545 break; 1546 case VCHR: 1547 mode |= S_IFCHR; 1548 break; 1549 case VLNK: 1550 mode |= S_IFLNK; 1551 break; 1552 case VSOCK: 1553 mode |= S_IFSOCK; 1554 break; 1555 case VFIFO: 1556 mode |= S_IFIFO; 1557 break; 1558 default: 1559 error = EBADF; 1560 goto out; 1561 } 1562 sb->st_mode = mode; 1563 sb->st_nlink = vap->va_nlink; 1564 sb->st_uid = vap->va_uid; 1565 sb->st_gid = vap->va_gid; 1566 sb->st_rdev = vap->va_rdev; 1567 if (vap->va_size > OFF_MAX) { 1568 error = EOVERFLOW; 1569 goto out; 1570 } 1571 sb->st_size = vap->va_size; 1572 sb->st_atim.tv_sec = vap->va_atime.tv_sec; 1573 sb->st_atim.tv_nsec = vap->va_atime.tv_nsec; 1574 sb->st_mtim.tv_sec = vap->va_mtime.tv_sec; 1575 sb->st_mtim.tv_nsec = vap->va_mtime.tv_nsec; 1576 sb->st_ctim.tv_sec = vap->va_ctime.tv_sec; 1577 sb->st_ctim.tv_nsec = vap->va_ctime.tv_nsec; 1578 sb->st_birthtim.tv_sec = vap->va_birthtime.tv_sec; 1579 sb->st_birthtim.tv_nsec = vap->va_birthtime.tv_nsec; 1580 1581 /* 1582 * According to www.opengroup.org, the meaning of st_blksize is 1583 * "a filesystem-specific preferred I/O block size for this 1584 * object. In some filesystem types, this may vary from file 1585 * to file" 1586 * Use minimum/default of PAGE_SIZE (e.g. for VCHR). 1587 */ 1588 1589 sb->st_blksize = max(PAGE_SIZE, vap->va_blocksize); 1590 sb->st_flags = vap->va_flags; 1591 sb->st_blocks = vap->va_bytes / S_BLKSIZE; 1592 sb->st_gen = vap->va_gen; 1593 out: 1594 return (vop_stat_helper_post(a, error)); 1595 } 1596 1597 static int 1598 vop_stdread_pgcache(struct vop_read_pgcache_args *ap __unused) 1599 { 1600 return (EJUSTRETURN); 1601 } 1602 1603 static int 1604 vop_stdvput_pair(struct vop_vput_pair_args *ap) 1605 { 1606 struct vnode *dvp, *vp, **vpp; 1607 1608 dvp = ap->a_dvp; 1609 vpp = ap->a_vpp; 1610 vput(dvp); 1611 if (vpp != NULL && ap->a_unlock_vp && (vp = *vpp) != NULL) 1612 vput(vp); 1613 return (0); 1614 } 1615