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