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/inotify.h> 43 #include <sys/kernel.h> 44 #include <sys/limits.h> 45 #include <sys/lock.h> 46 #include <sys/lockf.h> 47 #include <sys/malloc.h> 48 #include <sys/mount.h> 49 #include <sys/namei.h> 50 #include <sys/rwlock.h> 51 #include <sys/fcntl.h> 52 #include <sys/unistd.h> 53 #include <sys/vnode.h> 54 #include <sys/dirent.h> 55 #include <sys/poll.h> 56 #include <sys/stat.h> 57 #include <security/audit/audit.h> 58 #include <sys/priv.h> 59 60 #include <security/mac/mac_framework.h> 61 62 #include <vm/vm.h> 63 #include <vm/vm_object.h> 64 #include <vm/vm_extern.h> 65 #include <vm/pmap.h> 66 #include <vm/vm_map.h> 67 #include <vm/vm_page.h> 68 #include <vm/vm_pager.h> 69 #include <vm/vnode_pager.h> 70 71 static int vop_nolookup(struct vop_lookup_args *); 72 static int vop_norename(struct vop_rename_args *); 73 static int vop_nostrategy(struct vop_strategy_args *); 74 static int dirent_exists(struct vnode *vp, const char *dirname, 75 struct thread *td); 76 77 static int vop_stdis_text(struct vop_is_text_args *ap); 78 static int vop_stdunset_text(struct vop_unset_text_args *ap); 79 static int vop_stdadd_writecount(struct vop_add_writecount_args *ap); 80 static int vop_stdcopy_file_range(struct vop_copy_file_range_args *ap); 81 static int vop_stdfdatasync(struct vop_fdatasync_args *ap); 82 static int vop_stdgetpages_async(struct vop_getpages_async_args *ap); 83 static int vop_stdread_pgcache(struct vop_read_pgcache_args *ap); 84 static int vop_stdstat(struct vop_stat_args *ap); 85 static int vop_stdvput_pair(struct vop_vput_pair_args *ap); 86 static int vop_stdgetlowvnode(struct vop_getlowvnode_args *ap); 87 88 /* 89 * This vnode table stores what we want to do if the filesystem doesn't 90 * implement a particular VOP. 91 * 92 * If there is no specific entry here, we will return EOPNOTSUPP. 93 * 94 * Note that every filesystem has to implement either vop_access 95 * or vop_accessx; failing to do so will result in immediate crash 96 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(), 97 * which calls vop_stdaccess() etc. 98 */ 99 100 struct vop_vector default_vnodeops = { 101 .vop_default = NULL, 102 .vop_bypass = VOP_EOPNOTSUPP, 103 104 .vop_access = vop_stdaccess, 105 .vop_accessx = vop_stdaccessx, 106 .vop_advise = vop_stdadvise, 107 .vop_advlock = vop_stdadvlock, 108 .vop_advlockasync = vop_stdadvlockasync, 109 .vop_advlockpurge = vop_stdadvlockpurge, 110 .vop_allocate = vop_stdallocate, 111 .vop_deallocate = vop_stddeallocate, 112 .vop_bmap = vop_stdbmap, 113 .vop_close = VOP_NULL, 114 .vop_fsync = VOP_NULL, 115 .vop_stat = vop_stdstat, 116 .vop_fdatasync = vop_stdfdatasync, 117 .vop_getlowvnode = vop_stdgetlowvnode, 118 .vop_getpages = vop_stdgetpages, 119 .vop_getpages_async = vop_stdgetpages_async, 120 .vop_getwritemount = vop_stdgetwritemount, 121 .vop_inactive = VOP_NULL, 122 .vop_need_inactive = vop_stdneed_inactive, 123 .vop_inotify = vop_stdinotify, 124 .vop_inotify_add_watch = vop_stdinotify_add_watch, 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 case _PC_NAMEDATTR_ENABLED: 458 case _PC_HAS_NAMEDATTR: 459 case _PC_HAS_HIDDENSYSTEM: 460 case _PC_CLONE_BLKSIZE: 461 case _PC_CASE_INSENSITIVE: 462 *ap->a_retval = 0; 463 return (0); 464 default: 465 return (EINVAL); 466 } 467 /* NOTREACHED */ 468 } 469 470 /* 471 * Standard lock, unlock and islocked functions. 472 */ 473 int 474 vop_stdlock(struct vop_lock1_args *ap) 475 { 476 struct vnode *vp = ap->a_vp; 477 struct mtx *ilk; 478 479 ilk = VI_MTX(vp); 480 return (lockmgr_lock_flags(vp->v_vnlock, ap->a_flags, 481 &ilk->lock_object, ap->a_file, ap->a_line)); 482 } 483 484 /* See above. */ 485 int 486 vop_stdunlock(struct vop_unlock_args *ap) 487 { 488 struct vnode *vp = ap->a_vp; 489 490 return (lockmgr_unlock(vp->v_vnlock)); 491 } 492 493 /* See above. */ 494 int 495 vop_stdislocked(struct vop_islocked_args *ap) 496 { 497 498 return (lockstatus(ap->a_vp->v_vnlock)); 499 } 500 501 /* 502 * Variants of the above set. 503 * 504 * Differences are: 505 * - shared locking disablement is not supported 506 * - v_vnlock pointer is not honored 507 */ 508 int 509 vop_lock(struct vop_lock1_args *ap) 510 { 511 struct vnode *vp = ap->a_vp; 512 int flags = ap->a_flags; 513 struct mtx *ilk; 514 515 MPASS(vp->v_vnlock == &vp->v_lock); 516 517 if (__predict_false((flags & ~(LK_TYPE_MASK | LK_NODDLKTREAT | LK_RETRY)) != 0)) 518 goto other; 519 520 switch (flags & LK_TYPE_MASK) { 521 case LK_SHARED: 522 return (lockmgr_slock(&vp->v_lock, flags, ap->a_file, ap->a_line)); 523 case LK_EXCLUSIVE: 524 return (lockmgr_xlock(&vp->v_lock, flags, ap->a_file, ap->a_line)); 525 } 526 other: 527 ilk = VI_MTX(vp); 528 return (lockmgr_lock_flags(&vp->v_lock, flags, 529 &ilk->lock_object, ap->a_file, ap->a_line)); 530 } 531 532 int 533 vop_unlock(struct vop_unlock_args *ap) 534 { 535 struct vnode *vp = ap->a_vp; 536 537 MPASS(vp->v_vnlock == &vp->v_lock); 538 539 return (lockmgr_unlock(&vp->v_lock)); 540 } 541 542 int 543 vop_islocked(struct vop_islocked_args *ap) 544 { 545 struct vnode *vp = ap->a_vp; 546 547 MPASS(vp->v_vnlock == &vp->v_lock); 548 549 return (lockstatus(&vp->v_lock)); 550 } 551 552 /* 553 * Return true for select/poll. 554 */ 555 int 556 vop_nopoll(struct vop_poll_args *ap) 557 { 558 559 if (ap->a_events & ~POLLSTANDARD) 560 return (POLLNVAL); 561 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 562 } 563 564 /* 565 * Implement poll for local filesystems that support it. 566 */ 567 int 568 vop_stdpoll(struct vop_poll_args *ap) 569 { 570 if (ap->a_events & ~POLLSTANDARD) 571 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 572 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 573 } 574 575 /* 576 * Return our mount point, as we will take charge of the writes. 577 */ 578 int 579 vop_stdgetwritemount(struct vop_getwritemount_args *ap) 580 { 581 struct mount *mp; 582 struct vnode *vp; 583 584 /* 585 * Note that having a reference does not prevent forced unmount from 586 * setting ->v_mount to NULL after the lock gets released. This is of 587 * no consequence for typical consumers (most notably vn_start_write) 588 * since in this case the vnode is VIRF_DOOMED. Unmount might have 589 * progressed far enough that its completion is only delayed by the 590 * reference obtained here. The consumer only needs to concern itself 591 * with releasing it. 592 */ 593 vp = ap->a_vp; 594 mp = vfs_ref_from_vp(vp); 595 *(ap->a_mpp) = mp; 596 return (0); 597 } 598 599 /* 600 * If the file system doesn't implement VOP_BMAP, then return sensible defaults: 601 * - Return the vnode's bufobj instead of any underlying device's bufobj 602 * - Calculate the physical block number as if there were equal size 603 * consecutive blocks, but 604 * - Report no contiguous runs of blocks. 605 */ 606 int 607 vop_stdbmap(struct vop_bmap_args *ap) 608 { 609 610 if (ap->a_bop != NULL) 611 *ap->a_bop = &ap->a_vp->v_bufobj; 612 if (ap->a_bnp != NULL) 613 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 614 if (ap->a_runp != NULL) 615 *ap->a_runp = 0; 616 if (ap->a_runb != NULL) 617 *ap->a_runb = 0; 618 return (0); 619 } 620 621 int 622 vop_stdfsync(struct vop_fsync_args *ap) 623 { 624 625 return (vn_fsync_buf(ap->a_vp, ap->a_waitfor)); 626 } 627 628 static int 629 vop_stdfdatasync(struct vop_fdatasync_args *ap) 630 { 631 632 return (VOP_FSYNC(ap->a_vp, MNT_WAIT, ap->a_td)); 633 } 634 635 int 636 vop_stdfdatasync_buf(struct vop_fdatasync_args *ap) 637 { 638 639 return (vn_fsync_buf(ap->a_vp, MNT_WAIT)); 640 } 641 642 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 643 int 644 vop_stdgetpages(struct vop_getpages_args *ap) 645 { 646 647 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 648 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL); 649 } 650 651 static int 652 vop_stdgetpages_async(struct vop_getpages_async_args *ap) 653 { 654 int error; 655 656 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind, 657 ap->a_rahead); 658 if (ap->a_iodone != NULL) 659 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error); 660 return (error); 661 } 662 663 int 664 vop_stdkqfilter(struct vop_kqfilter_args *ap) 665 { 666 return vfs_kqfilter(ap); 667 } 668 669 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 670 int 671 vop_stdputpages(struct vop_putpages_args *ap) 672 { 673 674 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 675 ap->a_sync, ap->a_rtvals); 676 } 677 678 int 679 vop_stdvptofh(struct vop_vptofh_args *ap) 680 { 681 return (EOPNOTSUPP); 682 } 683 684 int 685 vop_stdvptocnp(struct vop_vptocnp_args *ap) 686 { 687 struct vnode *const vp = ap->a_vp; 688 struct vnode **const dvp = ap->a_vpp; 689 char *buf = ap->a_buf; 690 size_t *buflen = ap->a_buflen; 691 char *dirbuf; 692 int i = *buflen; 693 int error = 0, covered = 0; 694 int eofflag, flags, locked; 695 size_t dirbuflen, len; 696 off_t off; 697 ino_t fileno; 698 struct vattr va; 699 struct nameidata nd; 700 struct thread *const td = curthread; 701 struct ucred *const cred = td->td_ucred; 702 struct dirent *dp; 703 struct vnode *mvp; 704 705 if (vp->v_type != VDIR) 706 return (ENOENT); 707 708 error = VOP_GETATTR(vp, &va, cred); 709 if (error) 710 return (error); 711 712 vref(vp); 713 locked = VOP_ISLOCKED(vp); 714 VOP_UNLOCK(vp); 715 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE, 716 "..", vp); 717 flags = FREAD; 718 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 719 if (error) { 720 vn_lock(vp, locked | LK_RETRY); 721 return (error); 722 } 723 NDFREE_PNBUF(&nd); 724 725 mvp = *dvp = nd.ni_vp; 726 727 if (vp->v_mount != (*dvp)->v_mount && 728 ((*dvp)->v_vflag & VV_ROOT) && 729 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 730 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 731 vref(mvp); 732 VOP_UNLOCK(mvp); 733 vn_close(mvp, FREAD, cred, td); 734 vref(*dvp); 735 vn_lock(*dvp, LK_SHARED | LK_RETRY); 736 covered = 1; 737 } 738 739 fileno = va.va_fileid; 740 741 dirbuflen = MAX(DEV_BSIZE, GENERIC_MAXDIRSIZ); 742 if (dirbuflen < va.va_blocksize) 743 dirbuflen = va.va_blocksize; 744 dirbuf = malloc(dirbuflen, M_TEMP, M_WAITOK); 745 746 if ((*dvp)->v_type != VDIR) { 747 error = ENOENT; 748 goto out; 749 } 750 751 len = 0; 752 off = 0; 753 eofflag = 0; 754 755 for (;;) { 756 /* call VOP_READDIR of parent */ 757 error = vn_dir_next_dirent(*dvp, td, 758 dirbuf, dirbuflen, &dp, &len, &off, &eofflag); 759 if (error != 0) 760 goto out; 761 762 if (len == 0) { 763 error = ENOENT; 764 goto out; 765 } 766 767 if ((dp->d_type != DT_WHT) && 768 (dp->d_fileno == fileno)) { 769 if (covered) { 770 VOP_UNLOCK(*dvp); 771 vn_lock(mvp, LK_SHARED | LK_RETRY); 772 if (dirent_exists(mvp, dp->d_name, td) == 0) { 773 error = ENOENT; 774 VOP_UNLOCK(mvp); 775 vn_lock(*dvp, LK_SHARED | LK_RETRY); 776 goto out; 777 } 778 VOP_UNLOCK(mvp); 779 vn_lock(*dvp, LK_SHARED | LK_RETRY); 780 } 781 i -= dp->d_namlen; 782 783 if (i < 0) { 784 error = ENOMEM; 785 goto out; 786 } 787 if (dp->d_namlen == 1 && dp->d_name[0] == '.') { 788 error = ENOENT; 789 } else { 790 bcopy(dp->d_name, buf + i, dp->d_namlen); 791 error = 0; 792 } 793 goto out; 794 } 795 } 796 797 out: 798 free(dirbuf, M_TEMP); 799 if (!error) { 800 *buflen = i; 801 vref(*dvp); 802 } 803 if (covered) { 804 vput(*dvp); 805 vrele(mvp); 806 } else { 807 VOP_UNLOCK(mvp); 808 vn_close(mvp, FREAD, cred, td); 809 } 810 vn_lock(vp, locked | LK_RETRY); 811 return (error); 812 } 813 814 int 815 vop_stdallocate(struct vop_allocate_args *ap) 816 { 817 #ifdef __notyet__ 818 struct statfs *sfs; 819 off_t maxfilesize = 0; 820 #endif 821 struct iovec aiov; 822 struct vattr vattr, *vap; 823 struct uio auio; 824 off_t fsize, len, cur, offset; 825 uint8_t *buf; 826 struct thread *td; 827 struct vnode *vp; 828 size_t iosize; 829 int error; 830 831 buf = NULL; 832 error = 0; 833 td = curthread; 834 vap = &vattr; 835 vp = ap->a_vp; 836 len = *ap->a_len; 837 offset = *ap->a_offset; 838 839 error = VOP_GETATTR(vp, vap, ap->a_cred); 840 if (error != 0) 841 goto out; 842 fsize = vap->va_size; 843 iosize = vap->va_blocksize; 844 if (iosize == 0) 845 iosize = BLKDEV_IOSIZE; 846 if (iosize > maxphys) 847 iosize = maxphys; 848 buf = malloc(iosize, M_TEMP, M_WAITOK); 849 850 #ifdef __notyet__ 851 /* 852 * Check if the filesystem sets f_maxfilesize; if not use 853 * VOP_SETATTR to perform the check. 854 */ 855 sfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 856 error = VFS_STATFS(vp->v_mount, sfs, td); 857 if (error == 0) 858 maxfilesize = sfs->f_maxfilesize; 859 free(sfs, M_STATFS); 860 if (error != 0) 861 goto out; 862 if (maxfilesize) { 863 if (offset > maxfilesize || len > maxfilesize || 864 offset + len > maxfilesize) { 865 error = EFBIG; 866 goto out; 867 } 868 } else 869 #endif 870 if (offset + len > vap->va_size) { 871 /* 872 * Test offset + len against the filesystem's maxfilesize. 873 */ 874 VATTR_NULL(vap); 875 vap->va_size = offset + len; 876 error = VOP_SETATTR(vp, vap, ap->a_cred); 877 if (error != 0) 878 goto out; 879 VATTR_NULL(vap); 880 vap->va_size = fsize; 881 error = VOP_SETATTR(vp, vap, ap->a_cred); 882 if (error != 0) 883 goto out; 884 } 885 886 for (;;) { 887 /* 888 * Read and write back anything below the nominal file 889 * size. There's currently no way outside the filesystem 890 * to know whether this area is sparse or not. 891 */ 892 cur = iosize; 893 if ((offset % iosize) != 0) 894 cur -= (offset % iosize); 895 if (cur > len) 896 cur = len; 897 if (offset < fsize) { 898 aiov.iov_base = buf; 899 aiov.iov_len = cur; 900 auio.uio_iov = &aiov; 901 auio.uio_iovcnt = 1; 902 auio.uio_offset = offset; 903 auio.uio_resid = cur; 904 auio.uio_segflg = UIO_SYSSPACE; 905 auio.uio_rw = UIO_READ; 906 auio.uio_td = td; 907 error = VOP_READ(vp, &auio, ap->a_ioflag, ap->a_cred); 908 if (error != 0) 909 break; 910 if (auio.uio_resid > 0) { 911 bzero(buf + cur - auio.uio_resid, 912 auio.uio_resid); 913 } 914 } else { 915 bzero(buf, cur); 916 } 917 918 aiov.iov_base = buf; 919 aiov.iov_len = cur; 920 auio.uio_iov = &aiov; 921 auio.uio_iovcnt = 1; 922 auio.uio_offset = offset; 923 auio.uio_resid = cur; 924 auio.uio_segflg = UIO_SYSSPACE; 925 auio.uio_rw = UIO_WRITE; 926 auio.uio_td = td; 927 928 error = VOP_WRITE(vp, &auio, ap->a_ioflag, ap->a_cred); 929 if (error != 0) 930 break; 931 932 len -= cur; 933 offset += cur; 934 if (len == 0) 935 break; 936 if (should_yield()) 937 break; 938 } 939 940 out: 941 *ap->a_len = len; 942 *ap->a_offset = offset; 943 free(buf, M_TEMP); 944 return (error); 945 } 946 947 static int 948 vp_zerofill(struct vnode *vp, struct vattr *vap, off_t *offsetp, off_t *lenp, 949 int ioflag, struct ucred *cred) 950 { 951 int iosize; 952 int error = 0; 953 struct iovec aiov; 954 struct uio auio; 955 struct thread *td; 956 off_t offset, len; 957 958 iosize = vap->va_blocksize; 959 td = curthread; 960 offset = *offsetp; 961 len = *lenp; 962 963 if (iosize == 0) 964 iosize = BLKDEV_IOSIZE; 965 /* If va_blocksize is 512 bytes, iosize will be 4 kilobytes */ 966 iosize = min(iosize * 8, ZERO_REGION_SIZE); 967 968 while (len > 0) { 969 int xfersize = iosize; 970 if (offset % iosize != 0) 971 xfersize -= offset % iosize; 972 if (xfersize > len) 973 xfersize = len; 974 975 aiov.iov_base = __DECONST(void *, zero_region); 976 aiov.iov_len = xfersize; 977 auio.uio_iov = &aiov; 978 auio.uio_iovcnt = 1; 979 auio.uio_offset = offset; 980 auio.uio_resid = xfersize; 981 auio.uio_segflg = UIO_SYSSPACE; 982 auio.uio_rw = UIO_WRITE; 983 auio.uio_td = td; 984 985 error = VOP_WRITE(vp, &auio, ioflag, cred); 986 if (error != 0) { 987 len -= xfersize - auio.uio_resid; 988 offset += xfersize - auio.uio_resid; 989 break; 990 } 991 992 len -= xfersize; 993 offset += xfersize; 994 } 995 996 *offsetp = offset; 997 *lenp = len; 998 return (error); 999 } 1000 1001 int 1002 vop_stddeallocate(struct vop_deallocate_args *ap) 1003 { 1004 struct vnode *vp; 1005 off_t offset, len; 1006 struct ucred *cred; 1007 int error; 1008 struct vattr va; 1009 off_t noff, xfersize, rem; 1010 1011 vp = ap->a_vp; 1012 offset = *ap->a_offset; 1013 cred = ap->a_cred; 1014 1015 error = VOP_GETATTR(vp, &va, cred); 1016 if (error) 1017 return (error); 1018 1019 len = omin((off_t)va.va_size - offset, *ap->a_len); 1020 while (len > 0) { 1021 noff = offset; 1022 error = vn_bmap_seekhole_locked(vp, FIOSEEKDATA, &noff, cred); 1023 if (error) { 1024 if (error != ENXIO) 1025 /* XXX: Is it okay to fallback further? */ 1026 goto out; 1027 1028 /* 1029 * No more data region to be filled 1030 */ 1031 offset += len; 1032 len = 0; 1033 error = 0; 1034 break; 1035 } 1036 KASSERT(noff >= offset, ("FIOSEEKDATA going backward")); 1037 if (noff != offset) { 1038 xfersize = omin(noff - offset, len); 1039 len -= xfersize; 1040 offset += xfersize; 1041 if (len == 0) 1042 break; 1043 } 1044 error = vn_bmap_seekhole_locked(vp, FIOSEEKHOLE, &noff, cred); 1045 if (error) 1046 goto out; 1047 1048 /* Fill zeroes */ 1049 xfersize = rem = omin(noff - offset, len); 1050 error = vp_zerofill(vp, &va, &offset, &rem, ap->a_ioflag, cred); 1051 if (error) { 1052 len -= xfersize - rem; 1053 goto out; 1054 } 1055 1056 len -= xfersize; 1057 if (should_yield()) 1058 break; 1059 } 1060 /* Handle the case when offset is beyond EOF */ 1061 if (len < 0) 1062 len = 0; 1063 out: 1064 *ap->a_offset = offset; 1065 *ap->a_len = len; 1066 return (error); 1067 } 1068 1069 int 1070 vop_stdadvise(struct vop_advise_args *ap) 1071 { 1072 struct vnode *vp; 1073 struct bufobj *bo; 1074 uintmax_t bstart, bend; 1075 daddr_t startn, endn; 1076 int bsize, error; 1077 1078 vp = ap->a_vp; 1079 switch (ap->a_advice) { 1080 case POSIX_FADV_WILLNEED: 1081 /* 1082 * Do nothing for now. Filesystems should provide a 1083 * custom method which starts an asynchronous read of 1084 * the requested region. 1085 */ 1086 error = 0; 1087 break; 1088 case POSIX_FADV_DONTNEED: 1089 error = 0; 1090 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1091 if (VN_IS_DOOMED(vp)) { 1092 VOP_UNLOCK(vp); 1093 break; 1094 } 1095 1096 /* 1097 * Round to block boundaries (and later possibly further to 1098 * page boundaries). Applications cannot reasonably be aware 1099 * of the boundaries, and the rounding must be to expand at 1100 * both extremities to cover enough. It still doesn't cover 1101 * read-ahead. For partial blocks, this gives unnecessary 1102 * discarding of buffers but is efficient enough since the 1103 * pages usually remain in VMIO for some time. 1104 */ 1105 bsize = vp->v_bufobj.bo_bsize; 1106 bstart = rounddown(ap->a_start, bsize); 1107 bend = ap->a_end; 1108 bend = roundup(bend, bsize); 1109 1110 /* 1111 * Deactivate pages in the specified range from the backing VM 1112 * object. Pages that are resident in the buffer cache will 1113 * remain wired until their corresponding buffers are released 1114 * below. 1115 */ 1116 if (vp->v_object != NULL) { 1117 VM_OBJECT_RLOCK(vp->v_object); 1118 vm_object_page_noreuse(vp->v_object, 1119 OFF_TO_IDX(trunc_page(bstart)), 1120 OFF_TO_IDX(round_page(bend))); 1121 VM_OBJECT_RUNLOCK(vp->v_object); 1122 } 1123 1124 bo = &vp->v_bufobj; 1125 startn = bstart / bsize; 1126 endn = bend / bsize; 1127 BO_RLOCK(bo); 1128 error = bnoreuselist(&bo->bo_clean, bo, startn, endn); 1129 if (error == 0) 1130 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn); 1131 BO_RUNLOCK(bo); 1132 VOP_UNLOCK(vp); 1133 break; 1134 default: 1135 error = EINVAL; 1136 break; 1137 } 1138 return (error); 1139 } 1140 1141 int 1142 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1143 { 1144 1145 ap->a_vp->v_unpcb = ap->a_unpcb; 1146 return (0); 1147 } 1148 1149 int 1150 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1151 { 1152 1153 *ap->a_unpcb = ap->a_vp->v_unpcb; 1154 return (0); 1155 } 1156 1157 int 1158 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1159 { 1160 1161 ap->a_vp->v_unpcb = NULL; 1162 return (0); 1163 } 1164 1165 static int 1166 vop_stdis_text(struct vop_is_text_args *ap) 1167 { 1168 1169 return ((int)atomic_load_int(&ap->a_vp->v_writecount) < 0); 1170 } 1171 1172 int 1173 vop_stdset_text(struct vop_set_text_args *ap) 1174 { 1175 struct vnode *vp; 1176 int n; 1177 bool gotref; 1178 1179 vp = ap->a_vp; 1180 1181 n = atomic_load_int(&vp->v_writecount); 1182 for (;;) { 1183 if (__predict_false(n > 0)) { 1184 return (ETXTBSY); 1185 } 1186 1187 /* 1188 * Transition point, we may need to grab a reference on the vnode. 1189 * 1190 * Take the ref early As a safety measure against bogus calls 1191 * to vop_stdunset_text. 1192 */ 1193 if (n == 0) { 1194 gotref = false; 1195 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) { 1196 vref(vp); 1197 gotref = true; 1198 } 1199 if (atomic_fcmpset_int(&vp->v_writecount, &n, -1)) { 1200 return (0); 1201 } 1202 if (gotref) { 1203 vunref(vp); 1204 } 1205 continue; 1206 } 1207 1208 MPASS(n < 0); 1209 if (atomic_fcmpset_int(&vp->v_writecount, &n, n - 1)) { 1210 return (0); 1211 } 1212 } 1213 __assert_unreachable(); 1214 } 1215 1216 static int 1217 vop_stdunset_text(struct vop_unset_text_args *ap) 1218 { 1219 struct vnode *vp; 1220 int n; 1221 1222 vp = ap->a_vp; 1223 1224 n = atomic_load_int(&vp->v_writecount); 1225 for (;;) { 1226 if (__predict_false(n >= 0)) { 1227 return (EINVAL); 1228 } 1229 1230 /* 1231 * Transition point, we may need to release a reference on the vnode. 1232 */ 1233 if (n == -1) { 1234 if (atomic_fcmpset_int(&vp->v_writecount, &n, 0)) { 1235 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) { 1236 vunref(vp); 1237 } 1238 return (0); 1239 } 1240 continue; 1241 } 1242 1243 MPASS(n < -1); 1244 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + 1)) { 1245 return (0); 1246 } 1247 } 1248 __assert_unreachable(); 1249 } 1250 1251 static __always_inline int 1252 vop_stdadd_writecount_impl(struct vop_add_writecount_args *ap, bool handle_msync) 1253 { 1254 struct vnode *vp; 1255 struct mount *mp __diagused; 1256 int n; 1257 1258 vp = ap->a_vp; 1259 1260 #ifdef INVARIANTS 1261 mp = vp->v_mount; 1262 if (mp != NULL) { 1263 if (handle_msync) { 1264 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) == 0, vp); 1265 } else { 1266 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) != 0, vp); 1267 } 1268 } 1269 #endif 1270 1271 n = atomic_load_int(&vp->v_writecount); 1272 for (;;) { 1273 if (__predict_false(n < 0)) { 1274 return (ETXTBSY); 1275 } 1276 1277 VNASSERT(n + ap->a_inc >= 0, vp, 1278 ("neg writecount increment %d + %d = %d", n, ap->a_inc, 1279 n + ap->a_inc)); 1280 if (n == 0) { 1281 if (handle_msync) { 1282 vlazy(vp); 1283 } 1284 } 1285 1286 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + ap->a_inc)) { 1287 return (0); 1288 } 1289 } 1290 __assert_unreachable(); 1291 } 1292 1293 int 1294 vop_stdadd_writecount(struct vop_add_writecount_args *ap) 1295 { 1296 1297 return (vop_stdadd_writecount_impl(ap, true)); 1298 } 1299 1300 int 1301 vop_stdadd_writecount_nomsync(struct vop_add_writecount_args *ap) 1302 { 1303 1304 return (vop_stdadd_writecount_impl(ap, false)); 1305 } 1306 1307 int 1308 vop_stdneed_inactive(struct vop_need_inactive_args *ap) 1309 { 1310 1311 return (1); 1312 } 1313 1314 int 1315 vop_stdinotify(struct vop_inotify_args *ap) 1316 { 1317 vn_inotify(ap->a_vp, ap->a_dvp, ap->a_cnp, ap->a_event, ap->a_cookie); 1318 return (0); 1319 } 1320 1321 int 1322 vop_stdinotify_add_watch(struct vop_inotify_add_watch_args *ap) 1323 { 1324 return (vn_inotify_add_watch(ap->a_vp, ap->a_sc, ap->a_mask, 1325 ap->a_wdp, ap->a_td)); 1326 } 1327 1328 int 1329 vop_stdioctl(struct vop_ioctl_args *ap) 1330 { 1331 struct vnode *vp; 1332 struct vattr va; 1333 off_t *offp; 1334 int error; 1335 1336 switch (ap->a_command) { 1337 case FIOSEEKDATA: 1338 case FIOSEEKHOLE: 1339 vp = ap->a_vp; 1340 error = vn_lock(vp, LK_SHARED); 1341 if (error != 0) 1342 return (EBADF); 1343 if (vp->v_type == VREG) 1344 error = VOP_GETATTR(vp, &va, ap->a_cred); 1345 else 1346 error = ENOTTY; 1347 if (error == 0) { 1348 offp = ap->a_data; 1349 if (*offp < 0 || *offp >= va.va_size) 1350 error = ENXIO; 1351 else if (ap->a_command == FIOSEEKHOLE) 1352 *offp = va.va_size; 1353 } 1354 VOP_UNLOCK(vp); 1355 break; 1356 default: 1357 error = ENOTTY; 1358 break; 1359 } 1360 return (error); 1361 } 1362 1363 /* 1364 * vfs default ops 1365 * used to fill the vfs function table to get reasonable default return values. 1366 */ 1367 int 1368 vfs_stdroot(struct mount *mp, int flags, struct vnode **vpp) 1369 { 1370 1371 return (EOPNOTSUPP); 1372 } 1373 1374 int 1375 vfs_stdstatfs(struct mount *mp, struct statfs *sbp) 1376 { 1377 1378 return (EOPNOTSUPP); 1379 } 1380 1381 int 1382 vfs_stdquotactl(struct mount *mp, int cmds, uid_t uid, void *arg, bool *mp_busy) 1383 { 1384 return (EOPNOTSUPP); 1385 } 1386 1387 int 1388 vfs_stdsync(struct mount *mp, int waitfor) 1389 { 1390 struct vnode *vp, *mvp; 1391 struct thread *td; 1392 int error, lockreq, allerror = 0; 1393 1394 td = curthread; 1395 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1396 if (waitfor != MNT_WAIT) 1397 lockreq |= LK_NOWAIT; 1398 /* 1399 * Force stale buffer cache information to be flushed. 1400 */ 1401 loop: 1402 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1403 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1404 VI_UNLOCK(vp); 1405 continue; 1406 } 1407 if ((error = vget(vp, lockreq)) != 0) { 1408 if (error == ENOENT) { 1409 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1410 goto loop; 1411 } 1412 continue; 1413 } 1414 error = VOP_FSYNC(vp, waitfor, td); 1415 if (error) 1416 allerror = error; 1417 vput(vp); 1418 } 1419 return (allerror); 1420 } 1421 1422 int 1423 vfs_stdnosync(struct mount *mp, int waitfor) 1424 { 1425 1426 return (0); 1427 } 1428 1429 static int 1430 vop_stdcopy_file_range(struct vop_copy_file_range_args *ap) 1431 { 1432 int error; 1433 1434 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 1435 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, ap->a_incred, 1436 ap->a_outcred, ap->a_fsizetd); 1437 return (error); 1438 } 1439 1440 int 1441 vfs_stdvget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 1442 { 1443 1444 return (EOPNOTSUPP); 1445 } 1446 1447 int 1448 vfs_stdfhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1449 { 1450 1451 return (EOPNOTSUPP); 1452 } 1453 1454 int 1455 vfs_stdinit(struct vfsconf *vfsp) 1456 { 1457 1458 return (0); 1459 } 1460 1461 int 1462 vfs_stduninit(struct vfsconf *vfsp) 1463 { 1464 1465 return(0); 1466 } 1467 1468 int 1469 vfs_stdextattrctl(struct mount *mp, int cmd, struct vnode *filename_vp, 1470 int attrnamespace, const char *attrname) 1471 { 1472 1473 if (filename_vp != NULL) 1474 VOP_UNLOCK(filename_vp); 1475 return (EOPNOTSUPP); 1476 } 1477 1478 int 1479 vfs_stdsysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req) 1480 { 1481 1482 return (EOPNOTSUPP); 1483 } 1484 1485 static vop_bypass_t * 1486 bp_by_off(struct vop_vector *vop, struct vop_generic_args *a) 1487 { 1488 1489 return (*(vop_bypass_t **)((char *)vop + a->a_desc->vdesc_vop_offset)); 1490 } 1491 1492 int 1493 vop_sigdefer(struct vop_vector *vop, struct vop_generic_args *a) 1494 { 1495 vop_bypass_t *bp; 1496 int prev_stops, rc; 1497 1498 bp = bp_by_off(vop, a); 1499 MPASS(bp != NULL); 1500 1501 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT); 1502 rc = bp(a); 1503 sigallowstop(prev_stops); 1504 return (rc); 1505 } 1506 1507 static int 1508 vop_stdstat(struct vop_stat_args *a) 1509 { 1510 struct vattr vattr; 1511 struct vattr *vap; 1512 struct vnode *vp; 1513 struct stat *sb; 1514 int error; 1515 u_short mode; 1516 1517 vp = a->a_vp; 1518 sb = a->a_sb; 1519 1520 error = vop_stat_helper_pre(a); 1521 if (error != 0) 1522 return (error); 1523 1524 vap = &vattr; 1525 1526 /* 1527 * Initialize defaults for new and unusual fields, so that file 1528 * systems which don't support these fields don't need to know 1529 * about them. 1530 */ 1531 vap->va_birthtime.tv_sec = -1; 1532 vap->va_birthtime.tv_nsec = 0; 1533 vap->va_fsid = VNOVAL; 1534 vap->va_gen = 0; 1535 vap->va_rdev = NODEV; 1536 vap->va_filerev = 0; 1537 vap->va_bsdflags = 0; 1538 1539 error = VOP_GETATTR(vp, vap, a->a_active_cred); 1540 if (error) 1541 goto out; 1542 1543 /* 1544 * Zero the spare stat fields 1545 */ 1546 bzero(sb, sizeof *sb); 1547 1548 /* 1549 * Copy from vattr table 1550 */ 1551 if (vap->va_fsid != VNOVAL) 1552 sb->st_dev = vap->va_fsid; 1553 else 1554 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 1555 sb->st_ino = vap->va_fileid; 1556 mode = vap->va_mode; 1557 switch (vap->va_type) { 1558 case VREG: 1559 mode |= S_IFREG; 1560 break; 1561 case VDIR: 1562 mode |= S_IFDIR; 1563 break; 1564 case VBLK: 1565 mode |= S_IFBLK; 1566 break; 1567 case VCHR: 1568 mode |= S_IFCHR; 1569 break; 1570 case VLNK: 1571 mode |= S_IFLNK; 1572 break; 1573 case VSOCK: 1574 mode |= S_IFSOCK; 1575 break; 1576 case VFIFO: 1577 mode |= S_IFIFO; 1578 break; 1579 default: 1580 error = EBADF; 1581 goto out; 1582 } 1583 sb->st_mode = mode; 1584 sb->st_nlink = vap->va_nlink; 1585 sb->st_uid = vap->va_uid; 1586 sb->st_gid = vap->va_gid; 1587 sb->st_rdev = vap->va_rdev; 1588 if (vap->va_size > OFF_MAX) { 1589 error = EOVERFLOW; 1590 goto out; 1591 } 1592 sb->st_size = vap->va_size; 1593 sb->st_atim.tv_sec = vap->va_atime.tv_sec; 1594 sb->st_atim.tv_nsec = vap->va_atime.tv_nsec; 1595 sb->st_mtim.tv_sec = vap->va_mtime.tv_sec; 1596 sb->st_mtim.tv_nsec = vap->va_mtime.tv_nsec; 1597 sb->st_ctim.tv_sec = vap->va_ctime.tv_sec; 1598 sb->st_ctim.tv_nsec = vap->va_ctime.tv_nsec; 1599 sb->st_birthtim.tv_sec = vap->va_birthtime.tv_sec; 1600 sb->st_birthtim.tv_nsec = vap->va_birthtime.tv_nsec; 1601 1602 /* 1603 * According to www.opengroup.org, the meaning of st_blksize is 1604 * "a filesystem-specific preferred I/O block size for this 1605 * object. In some filesystem types, this may vary from file 1606 * to file" 1607 * Use minimum/default of PAGE_SIZE (e.g. for VCHR). 1608 */ 1609 1610 sb->st_blksize = max(PAGE_SIZE, vap->va_blocksize); 1611 sb->st_flags = vap->va_flags; 1612 sb->st_blocks = vap->va_bytes / S_BLKSIZE; 1613 sb->st_gen = vap->va_gen; 1614 sb->st_filerev = vap->va_filerev; 1615 sb->st_bsdflags = vap->va_bsdflags; 1616 out: 1617 return (vop_stat_helper_post(a, error)); 1618 } 1619 1620 static int 1621 vop_stdread_pgcache(struct vop_read_pgcache_args *ap __unused) 1622 { 1623 return (EJUSTRETURN); 1624 } 1625 1626 static int 1627 vop_stdvput_pair(struct vop_vput_pair_args *ap) 1628 { 1629 struct vnode *dvp, *vp, **vpp; 1630 1631 dvp = ap->a_dvp; 1632 vpp = ap->a_vpp; 1633 vput(dvp); 1634 if (vpp != NULL && ap->a_unlock_vp && (vp = *vpp) != NULL) 1635 vput(vp); 1636 return (0); 1637 } 1638 1639 static int 1640 vop_stdgetlowvnode(struct vop_getlowvnode_args *ap) 1641 { 1642 vref(ap->a_vp); 1643 *ap->a_vplp = ap->a_vp; 1644 return (0); 1645 } 1646