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 get_next_dirent(struct vnode *vp, struct dirent **dpp, 79 char *dirbuf, int dirbuflen, off_t *off, 80 char **cpos, int *len, int *eofflag, 81 struct thread *td); 82 static int dirent_exists(struct vnode *vp, const char *dirname, 83 struct thread *td); 84 85 #define DIRENT_MINSIZE (sizeof(struct dirent) - (MAXNAMLEN+1) + 4) 86 87 static int vop_stdis_text(struct vop_is_text_args *ap); 88 static int vop_stdunset_text(struct vop_unset_text_args *ap); 89 static int vop_stdadd_writecount(struct vop_add_writecount_args *ap); 90 static int vop_stdcopy_file_range(struct vop_copy_file_range_args *ap); 91 static int vop_stdfdatasync(struct vop_fdatasync_args *ap); 92 static int vop_stdgetpages_async(struct vop_getpages_async_args *ap); 93 static int vop_stdread_pgcache(struct vop_read_pgcache_args *ap); 94 static int vop_stdstat(struct vop_stat_args *ap); 95 static int vop_stdvput_pair(struct vop_vput_pair_args *ap); 96 97 /* 98 * This vnode table stores what we want to do if the filesystem doesn't 99 * implement a particular VOP. 100 * 101 * If there is no specific entry here, we will return EOPNOTSUPP. 102 * 103 * Note that every filesystem has to implement either vop_access 104 * or vop_accessx; failing to do so will result in immediate crash 105 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(), 106 * which calls vop_stdaccess() etc. 107 */ 108 109 struct vop_vector default_vnodeops = { 110 .vop_default = NULL, 111 .vop_bypass = VOP_EOPNOTSUPP, 112 113 .vop_access = vop_stdaccess, 114 .vop_accessx = vop_stdaccessx, 115 .vop_advise = vop_stdadvise, 116 .vop_advlock = vop_stdadvlock, 117 .vop_advlockasync = vop_stdadvlockasync, 118 .vop_advlockpurge = vop_stdadvlockpurge, 119 .vop_allocate = vop_stdallocate, 120 .vop_deallocate = vop_stddeallocate, 121 .vop_bmap = vop_stdbmap, 122 .vop_close = VOP_NULL, 123 .vop_fsync = VOP_NULL, 124 .vop_stat = vop_stdstat, 125 .vop_fdatasync = vop_stdfdatasync, 126 .vop_getpages = vop_stdgetpages, 127 .vop_getpages_async = vop_stdgetpages_async, 128 .vop_getwritemount = vop_stdgetwritemount, 129 .vop_inactive = VOP_NULL, 130 .vop_need_inactive = vop_stdneed_inactive, 131 .vop_ioctl = vop_stdioctl, 132 .vop_kqfilter = vop_stdkqfilter, 133 .vop_islocked = vop_stdislocked, 134 .vop_lock1 = vop_stdlock, 135 .vop_lookup = vop_nolookup, 136 .vop_open = VOP_NULL, 137 .vop_pathconf = VOP_EINVAL, 138 .vop_poll = vop_nopoll, 139 .vop_putpages = vop_stdputpages, 140 .vop_readlink = VOP_EINVAL, 141 .vop_read_pgcache = vop_stdread_pgcache, 142 .vop_rename = vop_norename, 143 .vop_revoke = VOP_PANIC, 144 .vop_strategy = vop_nostrategy, 145 .vop_unlock = vop_stdunlock, 146 .vop_vptocnp = vop_stdvptocnp, 147 .vop_vptofh = vop_stdvptofh, 148 .vop_unp_bind = vop_stdunp_bind, 149 .vop_unp_connect = vop_stdunp_connect, 150 .vop_unp_detach = vop_stdunp_detach, 151 .vop_is_text = vop_stdis_text, 152 .vop_set_text = vop_stdset_text, 153 .vop_unset_text = vop_stdunset_text, 154 .vop_add_writecount = vop_stdadd_writecount, 155 .vop_copy_file_range = vop_stdcopy_file_range, 156 .vop_vput_pair = vop_stdvput_pair, 157 }; 158 VFS_VOP_VECTOR_REGISTER(default_vnodeops); 159 160 /* 161 * Series of placeholder functions for various error returns for 162 * VOPs. 163 */ 164 165 int 166 vop_eopnotsupp(struct vop_generic_args *ap) 167 { 168 /* 169 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 170 */ 171 172 return (EOPNOTSUPP); 173 } 174 175 int 176 vop_ebadf(struct vop_generic_args *ap) 177 { 178 179 return (EBADF); 180 } 181 182 int 183 vop_enotty(struct vop_generic_args *ap) 184 { 185 186 return (ENOTTY); 187 } 188 189 int 190 vop_einval(struct vop_generic_args *ap) 191 { 192 193 return (EINVAL); 194 } 195 196 int 197 vop_enoent(struct vop_generic_args *ap) 198 { 199 200 return (ENOENT); 201 } 202 203 int 204 vop_eagain(struct vop_generic_args *ap) 205 { 206 207 return (EAGAIN); 208 } 209 210 int 211 vop_null(struct vop_generic_args *ap) 212 { 213 214 return (0); 215 } 216 217 /* 218 * Helper function to panic on some bad VOPs in some filesystems. 219 */ 220 int 221 vop_panic(struct vop_generic_args *ap) 222 { 223 224 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 225 } 226 227 /* 228 * vop_std<something> and vop_no<something> are default functions for use by 229 * filesystems that need the "default reasonable" implementation for a 230 * particular operation. 231 * 232 * The documentation for the operations they implement exists (if it exists) 233 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 234 */ 235 236 /* 237 * Default vop for filesystems that do not support name lookup 238 */ 239 static int 240 vop_nolookup(struct vop_lookup_args *ap) 241 { 242 243 *ap->a_vpp = NULL; 244 return (ENOTDIR); 245 } 246 247 /* 248 * vop_norename: 249 * 250 * Handle unlock and reference counting for arguments of vop_rename 251 * for filesystems that do not implement rename operation. 252 */ 253 static int 254 vop_norename(struct vop_rename_args *ap) 255 { 256 257 vop_rename_fail(ap); 258 return (EOPNOTSUPP); 259 } 260 261 /* 262 * vop_nostrategy: 263 * 264 * Strategy routine for VFS devices that have none. 265 * 266 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 267 * routine. Typically this is done for a BIO_READ strategy call. 268 * Typically B_INVAL is assumed to already be clear prior to a write 269 * and should not be cleared manually unless you just made the buffer 270 * invalid. BIO_ERROR should be cleared either way. 271 */ 272 273 static int 274 vop_nostrategy (struct vop_strategy_args *ap) 275 { 276 printf("No strategy for buffer at %p\n", ap->a_bp); 277 vn_printf(ap->a_vp, "vnode "); 278 ap->a_bp->b_ioflags |= BIO_ERROR; 279 ap->a_bp->b_error = EOPNOTSUPP; 280 bufdone(ap->a_bp); 281 return (EOPNOTSUPP); 282 } 283 284 static int 285 get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf, 286 int dirbuflen, off_t *off, char **cpos, int *len, 287 int *eofflag, struct thread *td) 288 { 289 int error, reclen; 290 struct uio uio; 291 struct iovec iov; 292 struct dirent *dp; 293 294 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 295 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 296 297 if (*len == 0) { 298 iov.iov_base = dirbuf; 299 iov.iov_len = dirbuflen; 300 301 uio.uio_iov = &iov; 302 uio.uio_iovcnt = 1; 303 uio.uio_offset = *off; 304 uio.uio_resid = dirbuflen; 305 uio.uio_segflg = UIO_SYSSPACE; 306 uio.uio_rw = UIO_READ; 307 uio.uio_td = td; 308 309 *eofflag = 0; 310 311 #ifdef MAC 312 error = mac_vnode_check_readdir(td->td_ucred, vp); 313 if (error == 0) 314 #endif 315 error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag, 316 NULL, NULL); 317 if (error) 318 return (error); 319 320 *off = uio.uio_offset; 321 322 *cpos = dirbuf; 323 *len = (dirbuflen - uio.uio_resid); 324 325 if (*len == 0) 326 return (ENOENT); 327 } 328 329 dp = (struct dirent *)(*cpos); 330 reclen = dp->d_reclen; 331 *dpp = dp; 332 333 /* check for malformed directory.. */ 334 if (reclen < DIRENT_MINSIZE) 335 return (EINVAL); 336 337 *cpos += reclen; 338 *len -= reclen; 339 340 return (0); 341 } 342 343 /* 344 * Check if a named file exists in a given directory vnode. 345 */ 346 static int 347 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 348 { 349 char *dirbuf, *cpos; 350 int error, eofflag, dirbuflen, len, found; 351 off_t off; 352 struct dirent *dp; 353 struct vattr va; 354 355 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 356 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 357 358 found = 0; 359 360 error = VOP_GETATTR(vp, &va, td->td_ucred); 361 if (error) 362 return (found); 363 364 dirbuflen = DEV_BSIZE; 365 if (dirbuflen < va.va_blocksize) 366 dirbuflen = va.va_blocksize; 367 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 368 369 off = 0; 370 len = 0; 371 do { 372 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off, 373 &cpos, &len, &eofflag, td); 374 if (error) 375 goto out; 376 377 if (dp->d_type != DT_WHT && dp->d_fileno != 0 && 378 strcmp(dp->d_name, dirname) == 0) { 379 found = 1; 380 goto out; 381 } 382 } while (len > 0 || !eofflag); 383 384 out: 385 free(dirbuf, M_TEMP); 386 return (found); 387 } 388 389 int 390 vop_stdaccess(struct vop_access_args *ap) 391 { 392 393 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | 394 VAPPEND)) == 0, ("invalid bit in accmode")); 395 396 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td)); 397 } 398 399 int 400 vop_stdaccessx(struct vop_accessx_args *ap) 401 { 402 int error; 403 accmode_t accmode = ap->a_accmode; 404 405 error = vfs_unixify_accmode(&accmode); 406 if (error != 0) 407 return (error); 408 409 if (accmode == 0) 410 return (0); 411 412 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 413 } 414 415 /* 416 * Advisory record locking support 417 */ 418 int 419 vop_stdadvlock(struct vop_advlock_args *ap) 420 { 421 struct vnode *vp; 422 struct mount *mp; 423 struct vattr vattr; 424 int error; 425 426 vp = ap->a_vp; 427 428 /* 429 * Provide atomicity of open(O_CREAT | O_EXCL | O_EXLOCK) for 430 * local filesystems. See vn_open_cred() for reciprocal part. 431 */ 432 mp = vp->v_mount; 433 if (mp != NULL && (mp->mnt_flag & MNT_LOCAL) != 0 && 434 ap->a_op == F_SETLK && (ap->a_flags & F_FIRSTOPEN) == 0) { 435 VI_LOCK(vp); 436 while ((vp->v_iflag & VI_FOPENING) != 0) 437 msleep(vp, VI_MTX(vp), PLOCK, "lockfo", 0); 438 VI_UNLOCK(vp); 439 } 440 441 if (ap->a_fl->l_whence == SEEK_END) { 442 /* 443 * The NFSv4 server must avoid doing a vn_lock() here, since it 444 * can deadlock the nfsd threads, due to a LOR. Fortunately 445 * the NFSv4 server always uses SEEK_SET and this code is 446 * only required for the SEEK_END case. 447 */ 448 vn_lock(vp, LK_SHARED | LK_RETRY); 449 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 450 VOP_UNLOCK(vp); 451 if (error) 452 return (error); 453 } else 454 vattr.va_size = 0; 455 456 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size)); 457 } 458 459 int 460 vop_stdadvlockasync(struct vop_advlockasync_args *ap) 461 { 462 struct vnode *vp; 463 struct vattr vattr; 464 int error; 465 466 vp = ap->a_vp; 467 if (ap->a_fl->l_whence == SEEK_END) { 468 /* The size argument is only needed for SEEK_END. */ 469 vn_lock(vp, LK_SHARED | LK_RETRY); 470 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 471 VOP_UNLOCK(vp); 472 if (error) 473 return (error); 474 } else 475 vattr.va_size = 0; 476 477 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 478 } 479 480 int 481 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap) 482 { 483 struct vnode *vp; 484 485 vp = ap->a_vp; 486 lf_purgelocks(vp, &vp->v_lockf); 487 return (0); 488 } 489 490 /* 491 * vop_stdpathconf: 492 * 493 * Standard implementation of POSIX pathconf, to get information about limits 494 * for a filesystem. 495 * Override per filesystem for the case where the filesystem has smaller 496 * limits. 497 */ 498 int 499 vop_stdpathconf(struct vop_pathconf_args *ap) 500 { 501 502 switch (ap->a_name) { 503 case _PC_ASYNC_IO: 504 *ap->a_retval = _POSIX_ASYNCHRONOUS_IO; 505 return (0); 506 case _PC_PATH_MAX: 507 *ap->a_retval = PATH_MAX; 508 return (0); 509 case _PC_ACL_EXTENDED: 510 case _PC_ACL_NFS4: 511 case _PC_CAP_PRESENT: 512 case _PC_DEALLOC_PRESENT: 513 case _PC_INF_PRESENT: 514 case _PC_MAC_PRESENT: 515 *ap->a_retval = 0; 516 return (0); 517 default: 518 return (EINVAL); 519 } 520 /* NOTREACHED */ 521 } 522 523 /* 524 * Standard lock, unlock and islocked functions. 525 */ 526 int 527 vop_stdlock(struct vop_lock1_args *ap) 528 { 529 struct vnode *vp = ap->a_vp; 530 struct mtx *ilk; 531 532 ilk = VI_MTX(vp); 533 return (lockmgr_lock_flags(vp->v_vnlock, ap->a_flags, 534 &ilk->lock_object, ap->a_file, ap->a_line)); 535 } 536 537 /* See above. */ 538 int 539 vop_stdunlock(struct vop_unlock_args *ap) 540 { 541 struct vnode *vp = ap->a_vp; 542 543 return (lockmgr_unlock(vp->v_vnlock)); 544 } 545 546 /* See above. */ 547 int 548 vop_stdislocked(struct vop_islocked_args *ap) 549 { 550 551 return (lockstatus(ap->a_vp->v_vnlock)); 552 } 553 554 /* 555 * Variants of the above set. 556 * 557 * Differences are: 558 * - shared locking disablement is not supported 559 * - v_vnlock pointer is not honored 560 */ 561 int 562 vop_lock(struct vop_lock1_args *ap) 563 { 564 struct vnode *vp = ap->a_vp; 565 int flags = ap->a_flags; 566 struct mtx *ilk; 567 568 MPASS(vp->v_vnlock == &vp->v_lock); 569 570 if (__predict_false((flags & ~(LK_TYPE_MASK | LK_NODDLKTREAT | LK_RETRY)) != 0)) 571 goto other; 572 573 switch (flags & LK_TYPE_MASK) { 574 case LK_SHARED: 575 return (lockmgr_slock(&vp->v_lock, flags, ap->a_file, ap->a_line)); 576 case LK_EXCLUSIVE: 577 return (lockmgr_xlock(&vp->v_lock, flags, ap->a_file, ap->a_line)); 578 } 579 other: 580 ilk = VI_MTX(vp); 581 return (lockmgr_lock_flags(&vp->v_lock, flags, 582 &ilk->lock_object, ap->a_file, ap->a_line)); 583 } 584 585 int 586 vop_unlock(struct vop_unlock_args *ap) 587 { 588 struct vnode *vp = ap->a_vp; 589 590 MPASS(vp->v_vnlock == &vp->v_lock); 591 592 return (lockmgr_unlock(&vp->v_lock)); 593 } 594 595 int 596 vop_islocked(struct vop_islocked_args *ap) 597 { 598 struct vnode *vp = ap->a_vp; 599 600 MPASS(vp->v_vnlock == &vp->v_lock); 601 602 return (lockstatus(&vp->v_lock)); 603 } 604 605 /* 606 * Return true for select/poll. 607 */ 608 int 609 vop_nopoll(struct vop_poll_args *ap) 610 { 611 612 if (ap->a_events & ~POLLSTANDARD) 613 return (POLLNVAL); 614 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 615 } 616 617 /* 618 * Implement poll for local filesystems that support it. 619 */ 620 int 621 vop_stdpoll(struct vop_poll_args *ap) 622 { 623 if (ap->a_events & ~POLLSTANDARD) 624 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 625 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 626 } 627 628 /* 629 * Return our mount point, as we will take charge of the writes. 630 */ 631 int 632 vop_stdgetwritemount(struct vop_getwritemount_args *ap) 633 { 634 struct mount *mp; 635 struct vnode *vp; 636 637 /* 638 * Note that having a reference does not prevent forced unmount from 639 * setting ->v_mount to NULL after the lock gets released. This is of 640 * no consequence for typical consumers (most notably vn_start_write) 641 * since in this case the vnode is VIRF_DOOMED. Unmount might have 642 * progressed far enough that its completion is only delayed by the 643 * reference obtained here. The consumer only needs to concern itself 644 * with releasing it. 645 */ 646 vp = ap->a_vp; 647 mp = vfs_ref_from_vp(vp); 648 *(ap->a_mpp) = mp; 649 return (0); 650 } 651 652 /* 653 * If the file system doesn't implement VOP_BMAP, then return sensible defaults: 654 * - Return the vnode's bufobj instead of any underlying device's bufobj 655 * - Calculate the physical block number as if there were equal size 656 * consecutive blocks, but 657 * - Report no contiguous runs of blocks. 658 */ 659 int 660 vop_stdbmap(struct vop_bmap_args *ap) 661 { 662 663 if (ap->a_bop != NULL) 664 *ap->a_bop = &ap->a_vp->v_bufobj; 665 if (ap->a_bnp != NULL) 666 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 667 if (ap->a_runp != NULL) 668 *ap->a_runp = 0; 669 if (ap->a_runb != NULL) 670 *ap->a_runb = 0; 671 return (0); 672 } 673 674 int 675 vop_stdfsync(struct vop_fsync_args *ap) 676 { 677 678 return (vn_fsync_buf(ap->a_vp, ap->a_waitfor)); 679 } 680 681 static int 682 vop_stdfdatasync(struct vop_fdatasync_args *ap) 683 { 684 685 return (VOP_FSYNC(ap->a_vp, MNT_WAIT, ap->a_td)); 686 } 687 688 int 689 vop_stdfdatasync_buf(struct vop_fdatasync_args *ap) 690 { 691 692 return (vn_fsync_buf(ap->a_vp, MNT_WAIT)); 693 } 694 695 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 696 int 697 vop_stdgetpages(struct vop_getpages_args *ap) 698 { 699 700 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 701 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL); 702 } 703 704 static int 705 vop_stdgetpages_async(struct vop_getpages_async_args *ap) 706 { 707 int error; 708 709 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind, 710 ap->a_rahead); 711 if (ap->a_iodone != NULL) 712 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error); 713 return (error); 714 } 715 716 int 717 vop_stdkqfilter(struct vop_kqfilter_args *ap) 718 { 719 return vfs_kqfilter(ap); 720 } 721 722 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 723 int 724 vop_stdputpages(struct vop_putpages_args *ap) 725 { 726 727 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 728 ap->a_sync, ap->a_rtvals); 729 } 730 731 int 732 vop_stdvptofh(struct vop_vptofh_args *ap) 733 { 734 return (EOPNOTSUPP); 735 } 736 737 int 738 vop_stdvptocnp(struct vop_vptocnp_args *ap) 739 { 740 struct vnode *vp = ap->a_vp; 741 struct vnode **dvp = ap->a_vpp; 742 struct ucred *cred; 743 char *buf = ap->a_buf; 744 size_t *buflen = ap->a_buflen; 745 char *dirbuf, *cpos; 746 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 747 off_t off; 748 ino_t fileno; 749 struct vattr va; 750 struct nameidata nd; 751 struct thread *td; 752 struct dirent *dp; 753 struct vnode *mvp; 754 755 i = *buflen; 756 error = 0; 757 covered = 0; 758 td = curthread; 759 cred = td->td_ucred; 760 761 if (vp->v_type != VDIR) 762 return (ENOENT); 763 764 error = VOP_GETATTR(vp, &va, cred); 765 if (error) 766 return (error); 767 768 VREF(vp); 769 locked = VOP_ISLOCKED(vp); 770 VOP_UNLOCK(vp); 771 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE, 772 "..", vp); 773 flags = FREAD; 774 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 775 if (error) { 776 vn_lock(vp, locked | LK_RETRY); 777 return (error); 778 } 779 NDFREE_PNBUF(&nd); 780 781 mvp = *dvp = nd.ni_vp; 782 783 if (vp->v_mount != (*dvp)->v_mount && 784 ((*dvp)->v_vflag & VV_ROOT) && 785 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 786 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 787 VREF(mvp); 788 VOP_UNLOCK(mvp); 789 vn_close(mvp, FREAD, cred, td); 790 VREF(*dvp); 791 vn_lock(*dvp, LK_SHARED | LK_RETRY); 792 covered = 1; 793 } 794 795 fileno = va.va_fileid; 796 797 dirbuflen = DEV_BSIZE; 798 if (dirbuflen < va.va_blocksize) 799 dirbuflen = va.va_blocksize; 800 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 801 802 if ((*dvp)->v_type != VDIR) { 803 error = ENOENT; 804 goto out; 805 } 806 807 off = 0; 808 len = 0; 809 do { 810 /* call VOP_READDIR of parent */ 811 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 812 &cpos, &len, &eofflag, td); 813 if (error) 814 goto out; 815 816 if ((dp->d_type != DT_WHT) && 817 (dp->d_fileno == fileno)) { 818 if (covered) { 819 VOP_UNLOCK(*dvp); 820 vn_lock(mvp, LK_SHARED | LK_RETRY); 821 if (dirent_exists(mvp, dp->d_name, td)) { 822 error = ENOENT; 823 VOP_UNLOCK(mvp); 824 vn_lock(*dvp, LK_SHARED | LK_RETRY); 825 goto out; 826 } 827 VOP_UNLOCK(mvp); 828 vn_lock(*dvp, LK_SHARED | LK_RETRY); 829 } 830 i -= dp->d_namlen; 831 832 if (i < 0) { 833 error = ENOMEM; 834 goto out; 835 } 836 if (dp->d_namlen == 1 && dp->d_name[0] == '.') { 837 error = ENOENT; 838 } else { 839 bcopy(dp->d_name, buf + i, dp->d_namlen); 840 error = 0; 841 } 842 goto out; 843 } 844 } while (len > 0 || !eofflag); 845 error = ENOENT; 846 847 out: 848 free(dirbuf, M_TEMP); 849 if (!error) { 850 *buflen = i; 851 vref(*dvp); 852 } 853 if (covered) { 854 vput(*dvp); 855 vrele(mvp); 856 } else { 857 VOP_UNLOCK(mvp); 858 vn_close(mvp, FREAD, cred, td); 859 } 860 vn_lock(vp, locked | LK_RETRY); 861 return (error); 862 } 863 864 int 865 vop_stdallocate(struct vop_allocate_args *ap) 866 { 867 #ifdef __notyet__ 868 struct statfs *sfs; 869 off_t maxfilesize = 0; 870 #endif 871 struct iovec aiov; 872 struct vattr vattr, *vap; 873 struct uio auio; 874 off_t fsize, len, cur, offset; 875 uint8_t *buf; 876 struct thread *td; 877 struct vnode *vp; 878 size_t iosize; 879 int error; 880 881 buf = NULL; 882 error = 0; 883 td = curthread; 884 vap = &vattr; 885 vp = ap->a_vp; 886 len = *ap->a_len; 887 offset = *ap->a_offset; 888 889 error = VOP_GETATTR(vp, vap, ap->a_cred); 890 if (error != 0) 891 goto out; 892 fsize = vap->va_size; 893 iosize = vap->va_blocksize; 894 if (iosize == 0) 895 iosize = BLKDEV_IOSIZE; 896 if (iosize > maxphys) 897 iosize = maxphys; 898 buf = malloc(iosize, M_TEMP, M_WAITOK); 899 900 #ifdef __notyet__ 901 /* 902 * Check if the filesystem sets f_maxfilesize; if not use 903 * VOP_SETATTR to perform the check. 904 */ 905 sfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 906 error = VFS_STATFS(vp->v_mount, sfs, td); 907 if (error == 0) 908 maxfilesize = sfs->f_maxfilesize; 909 free(sfs, M_STATFS); 910 if (error != 0) 911 goto out; 912 if (maxfilesize) { 913 if (offset > maxfilesize || len > maxfilesize || 914 offset + len > maxfilesize) { 915 error = EFBIG; 916 goto out; 917 } 918 } else 919 #endif 920 if (offset + len > vap->va_size) { 921 /* 922 * Test offset + len against the filesystem's maxfilesize. 923 */ 924 VATTR_NULL(vap); 925 vap->va_size = offset + len; 926 error = VOP_SETATTR(vp, vap, ap->a_cred); 927 if (error != 0) 928 goto out; 929 VATTR_NULL(vap); 930 vap->va_size = fsize; 931 error = VOP_SETATTR(vp, vap, ap->a_cred); 932 if (error != 0) 933 goto out; 934 } 935 936 for (;;) { 937 /* 938 * Read and write back anything below the nominal file 939 * size. There's currently no way outside the filesystem 940 * to know whether this area is sparse or not. 941 */ 942 cur = iosize; 943 if ((offset % iosize) != 0) 944 cur -= (offset % iosize); 945 if (cur > len) 946 cur = len; 947 if (offset < fsize) { 948 aiov.iov_base = buf; 949 aiov.iov_len = cur; 950 auio.uio_iov = &aiov; 951 auio.uio_iovcnt = 1; 952 auio.uio_offset = offset; 953 auio.uio_resid = cur; 954 auio.uio_segflg = UIO_SYSSPACE; 955 auio.uio_rw = UIO_READ; 956 auio.uio_td = td; 957 error = VOP_READ(vp, &auio, ap->a_ioflag, ap->a_cred); 958 if (error != 0) 959 break; 960 if (auio.uio_resid > 0) { 961 bzero(buf + cur - auio.uio_resid, 962 auio.uio_resid); 963 } 964 } else { 965 bzero(buf, cur); 966 } 967 968 aiov.iov_base = buf; 969 aiov.iov_len = cur; 970 auio.uio_iov = &aiov; 971 auio.uio_iovcnt = 1; 972 auio.uio_offset = offset; 973 auio.uio_resid = cur; 974 auio.uio_segflg = UIO_SYSSPACE; 975 auio.uio_rw = UIO_WRITE; 976 auio.uio_td = td; 977 978 error = VOP_WRITE(vp, &auio, ap->a_ioflag, ap->a_cred); 979 if (error != 0) 980 break; 981 982 len -= cur; 983 offset += cur; 984 if (len == 0) 985 break; 986 if (should_yield()) 987 break; 988 } 989 990 out: 991 *ap->a_len = len; 992 *ap->a_offset = offset; 993 free(buf, M_TEMP); 994 return (error); 995 } 996 997 static int 998 vp_zerofill(struct vnode *vp, struct vattr *vap, off_t *offsetp, off_t *lenp, 999 int ioflag, struct ucred *cred) 1000 { 1001 int iosize; 1002 int error = 0; 1003 struct iovec aiov; 1004 struct uio auio; 1005 struct thread *td; 1006 off_t offset, len; 1007 1008 iosize = vap->va_blocksize; 1009 td = curthread; 1010 offset = *offsetp; 1011 len = *lenp; 1012 1013 if (iosize == 0) 1014 iosize = BLKDEV_IOSIZE; 1015 /* If va_blocksize is 512 bytes, iosize will be 4 kilobytes */ 1016 iosize = min(iosize * 8, ZERO_REGION_SIZE); 1017 1018 while (len > 0) { 1019 int xfersize = iosize; 1020 if (offset % iosize != 0) 1021 xfersize -= offset % iosize; 1022 if (xfersize > len) 1023 xfersize = len; 1024 1025 aiov.iov_base = __DECONST(void *, zero_region); 1026 aiov.iov_len = xfersize; 1027 auio.uio_iov = &aiov; 1028 auio.uio_iovcnt = 1; 1029 auio.uio_offset = offset; 1030 auio.uio_resid = xfersize; 1031 auio.uio_segflg = UIO_SYSSPACE; 1032 auio.uio_rw = UIO_WRITE; 1033 auio.uio_td = td; 1034 1035 error = VOP_WRITE(vp, &auio, ioflag, cred); 1036 if (error != 0) { 1037 len -= xfersize - auio.uio_resid; 1038 offset += xfersize - auio.uio_resid; 1039 break; 1040 } 1041 1042 len -= xfersize; 1043 offset += xfersize; 1044 } 1045 1046 *offsetp = offset; 1047 *lenp = len; 1048 return (error); 1049 } 1050 1051 int 1052 vop_stddeallocate(struct vop_deallocate_args *ap) 1053 { 1054 struct vnode *vp; 1055 off_t offset, len; 1056 struct ucred *cred; 1057 int error; 1058 struct vattr va; 1059 off_t noff, xfersize, rem; 1060 1061 vp = ap->a_vp; 1062 offset = *ap->a_offset; 1063 cred = ap->a_cred; 1064 1065 error = VOP_GETATTR(vp, &va, cred); 1066 if (error) 1067 return (error); 1068 1069 len = omin((off_t)va.va_size - offset, *ap->a_len); 1070 while (len > 0) { 1071 noff = offset; 1072 error = vn_bmap_seekhole_locked(vp, FIOSEEKDATA, &noff, cred); 1073 if (error) { 1074 if (error != ENXIO) 1075 /* XXX: Is it okay to fallback further? */ 1076 goto out; 1077 1078 /* 1079 * No more data region to be filled 1080 */ 1081 offset += len; 1082 len = 0; 1083 error = 0; 1084 break; 1085 } 1086 KASSERT(noff >= offset, ("FIOSEEKDATA going backward")); 1087 if (noff != offset) { 1088 xfersize = omin(noff - offset, len); 1089 len -= xfersize; 1090 offset += xfersize; 1091 if (len == 0) 1092 break; 1093 } 1094 error = vn_bmap_seekhole_locked(vp, FIOSEEKHOLE, &noff, cred); 1095 if (error) 1096 goto out; 1097 1098 /* Fill zeroes */ 1099 xfersize = rem = omin(noff - offset, len); 1100 error = vp_zerofill(vp, &va, &offset, &rem, ap->a_ioflag, cred); 1101 if (error) { 1102 len -= xfersize - rem; 1103 goto out; 1104 } 1105 1106 len -= xfersize; 1107 if (should_yield()) 1108 break; 1109 } 1110 /* Handle the case when offset is beyond EOF */ 1111 if (len < 0) 1112 len = 0; 1113 out: 1114 *ap->a_offset = offset; 1115 *ap->a_len = len; 1116 return (error); 1117 } 1118 1119 int 1120 vop_stdadvise(struct vop_advise_args *ap) 1121 { 1122 struct vnode *vp; 1123 struct bufobj *bo; 1124 daddr_t startn, endn; 1125 off_t bstart, bend, start, end; 1126 int bsize, error; 1127 1128 vp = ap->a_vp; 1129 switch (ap->a_advice) { 1130 case POSIX_FADV_WILLNEED: 1131 /* 1132 * Do nothing for now. Filesystems should provide a 1133 * custom method which starts an asynchronous read of 1134 * the requested region. 1135 */ 1136 error = 0; 1137 break; 1138 case POSIX_FADV_DONTNEED: 1139 error = 0; 1140 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1141 if (VN_IS_DOOMED(vp)) { 1142 VOP_UNLOCK(vp); 1143 break; 1144 } 1145 1146 /* 1147 * Round to block boundaries (and later possibly further to 1148 * page boundaries). Applications cannot reasonably be aware 1149 * of the boundaries, and the rounding must be to expand at 1150 * both extremities to cover enough. It still doesn't cover 1151 * read-ahead. For partial blocks, this gives unnecessary 1152 * discarding of buffers but is efficient enough since the 1153 * pages usually remain in VMIO for some time. 1154 */ 1155 bsize = vp->v_bufobj.bo_bsize; 1156 bstart = rounddown(ap->a_start, bsize); 1157 bend = roundup(ap->a_end, bsize); 1158 1159 /* 1160 * Deactivate pages in the specified range from the backing VM 1161 * object. Pages that are resident in the buffer cache will 1162 * remain wired until their corresponding buffers are released 1163 * below. 1164 */ 1165 if (vp->v_object != NULL) { 1166 start = trunc_page(bstart); 1167 end = round_page(bend); 1168 VM_OBJECT_RLOCK(vp->v_object); 1169 vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start), 1170 OFF_TO_IDX(end)); 1171 VM_OBJECT_RUNLOCK(vp->v_object); 1172 } 1173 1174 bo = &vp->v_bufobj; 1175 BO_RLOCK(bo); 1176 startn = bstart / bsize; 1177 endn = bend / bsize; 1178 error = bnoreuselist(&bo->bo_clean, bo, startn, endn); 1179 if (error == 0) 1180 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn); 1181 BO_RUNLOCK(bo); 1182 VOP_UNLOCK(vp); 1183 break; 1184 default: 1185 error = EINVAL; 1186 break; 1187 } 1188 return (error); 1189 } 1190 1191 int 1192 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1193 { 1194 1195 ap->a_vp->v_unpcb = ap->a_unpcb; 1196 return (0); 1197 } 1198 1199 int 1200 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1201 { 1202 1203 *ap->a_unpcb = ap->a_vp->v_unpcb; 1204 return (0); 1205 } 1206 1207 int 1208 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1209 { 1210 1211 ap->a_vp->v_unpcb = NULL; 1212 return (0); 1213 } 1214 1215 static int 1216 vop_stdis_text(struct vop_is_text_args *ap) 1217 { 1218 1219 return (atomic_load_int(&ap->a_vp->v_writecount) < 0); 1220 } 1221 1222 int 1223 vop_stdset_text(struct vop_set_text_args *ap) 1224 { 1225 struct vnode *vp; 1226 int n; 1227 bool gotref; 1228 1229 vp = ap->a_vp; 1230 1231 n = atomic_load_int(&vp->v_writecount); 1232 for (;;) { 1233 if (__predict_false(n > 0)) { 1234 return (ETXTBSY); 1235 } 1236 1237 /* 1238 * Transition point, we may need to grab a reference on the vnode. 1239 * 1240 * Take the ref early As a safety measure against bogus calls 1241 * to vop_stdunset_text. 1242 */ 1243 if (n == 0) { 1244 gotref = false; 1245 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) { 1246 vref(vp); 1247 gotref = true; 1248 } 1249 if (atomic_fcmpset_int(&vp->v_writecount, &n, -1)) { 1250 return (0); 1251 } 1252 if (gotref) { 1253 vunref(vp); 1254 } 1255 continue; 1256 } 1257 1258 MPASS(n < 0); 1259 if (atomic_fcmpset_int(&vp->v_writecount, &n, n - 1)) { 1260 return (0); 1261 } 1262 } 1263 __assert_unreachable(); 1264 } 1265 1266 static int 1267 vop_stdunset_text(struct vop_unset_text_args *ap) 1268 { 1269 struct vnode *vp; 1270 int n; 1271 1272 vp = ap->a_vp; 1273 1274 n = atomic_load_int(&vp->v_writecount); 1275 for (;;) { 1276 if (__predict_false(n >= 0)) { 1277 return (EINVAL); 1278 } 1279 1280 /* 1281 * Transition point, we may need to release a reference on the vnode. 1282 */ 1283 if (n == -1) { 1284 if (atomic_fcmpset_int(&vp->v_writecount, &n, 0)) { 1285 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) { 1286 vunref(vp); 1287 } 1288 return (0); 1289 } 1290 continue; 1291 } 1292 1293 MPASS(n < -1); 1294 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + 1)) { 1295 return (0); 1296 } 1297 } 1298 __assert_unreachable(); 1299 } 1300 1301 static int __always_inline 1302 vop_stdadd_writecount_impl(struct vop_add_writecount_args *ap, bool handle_msync) 1303 { 1304 struct vnode *vp; 1305 struct mount *mp __diagused; 1306 int n; 1307 1308 vp = ap->a_vp; 1309 1310 #ifdef INVARIANTS 1311 mp = vp->v_mount; 1312 if (mp != NULL) { 1313 if (handle_msync) { 1314 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) == 0, vp); 1315 } else { 1316 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) != 0, vp); 1317 } 1318 } 1319 #endif 1320 1321 n = atomic_load_int(&vp->v_writecount); 1322 for (;;) { 1323 if (__predict_false(n < 0)) { 1324 return (ETXTBSY); 1325 } 1326 1327 VNASSERT(n + ap->a_inc >= 0, vp, 1328 ("neg writecount increment %d + %d = %d", n, ap->a_inc, 1329 n + ap->a_inc)); 1330 if (n == 0) { 1331 if (handle_msync) { 1332 vlazy(vp); 1333 } 1334 } 1335 1336 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + ap->a_inc)) { 1337 return (0); 1338 } 1339 } 1340 __assert_unreachable(); 1341 } 1342 1343 int 1344 vop_stdadd_writecount(struct vop_add_writecount_args *ap) 1345 { 1346 1347 return (vop_stdadd_writecount_impl(ap, true)); 1348 } 1349 1350 int 1351 vop_stdadd_writecount_nomsync(struct vop_add_writecount_args *ap) 1352 { 1353 1354 return (vop_stdadd_writecount_impl(ap, false)); 1355 } 1356 1357 int 1358 vop_stdneed_inactive(struct vop_need_inactive_args *ap) 1359 { 1360 1361 return (1); 1362 } 1363 1364 int 1365 vop_stdioctl(struct vop_ioctl_args *ap) 1366 { 1367 struct vnode *vp; 1368 struct vattr va; 1369 off_t *offp; 1370 int error; 1371 1372 switch (ap->a_command) { 1373 case FIOSEEKDATA: 1374 case FIOSEEKHOLE: 1375 vp = ap->a_vp; 1376 error = vn_lock(vp, LK_SHARED); 1377 if (error != 0) 1378 return (EBADF); 1379 if (vp->v_type == VREG) 1380 error = VOP_GETATTR(vp, &va, ap->a_cred); 1381 else 1382 error = ENOTTY; 1383 if (error == 0) { 1384 offp = ap->a_data; 1385 if (*offp < 0 || *offp >= va.va_size) 1386 error = ENXIO; 1387 else if (ap->a_command == FIOSEEKHOLE) 1388 *offp = va.va_size; 1389 } 1390 VOP_UNLOCK(vp); 1391 break; 1392 default: 1393 error = ENOTTY; 1394 break; 1395 } 1396 return (error); 1397 } 1398 1399 /* 1400 * vfs default ops 1401 * used to fill the vfs function table to get reasonable default return values. 1402 */ 1403 int 1404 vfs_stdroot(struct mount *mp, int flags, struct vnode **vpp) 1405 { 1406 1407 return (EOPNOTSUPP); 1408 } 1409 1410 int 1411 vfs_stdstatfs(struct mount *mp, struct statfs *sbp) 1412 { 1413 1414 return (EOPNOTSUPP); 1415 } 1416 1417 int 1418 vfs_stdquotactl(struct mount *mp, int cmds, uid_t uid, void *arg, bool *mp_busy) 1419 { 1420 return (EOPNOTSUPP); 1421 } 1422 1423 int 1424 vfs_stdsync(struct mount *mp, int waitfor) 1425 { 1426 struct vnode *vp, *mvp; 1427 struct thread *td; 1428 int error, lockreq, allerror = 0; 1429 1430 td = curthread; 1431 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1432 if (waitfor != MNT_WAIT) 1433 lockreq |= LK_NOWAIT; 1434 /* 1435 * Force stale buffer cache information to be flushed. 1436 */ 1437 loop: 1438 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1439 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1440 VI_UNLOCK(vp); 1441 continue; 1442 } 1443 if ((error = vget(vp, lockreq)) != 0) { 1444 if (error == ENOENT) { 1445 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1446 goto loop; 1447 } 1448 continue; 1449 } 1450 error = VOP_FSYNC(vp, waitfor, td); 1451 if (error) 1452 allerror = error; 1453 vput(vp); 1454 } 1455 return (allerror); 1456 } 1457 1458 int 1459 vfs_stdnosync(struct mount *mp, int waitfor) 1460 { 1461 1462 return (0); 1463 } 1464 1465 static int 1466 vop_stdcopy_file_range(struct vop_copy_file_range_args *ap) 1467 { 1468 int error; 1469 1470 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 1471 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, ap->a_incred, 1472 ap->a_outcred, ap->a_fsizetd); 1473 return (error); 1474 } 1475 1476 int 1477 vfs_stdvget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 1478 { 1479 1480 return (EOPNOTSUPP); 1481 } 1482 1483 int 1484 vfs_stdfhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1485 { 1486 1487 return (EOPNOTSUPP); 1488 } 1489 1490 int 1491 vfs_stdinit(struct vfsconf *vfsp) 1492 { 1493 1494 return (0); 1495 } 1496 1497 int 1498 vfs_stduninit(struct vfsconf *vfsp) 1499 { 1500 1501 return(0); 1502 } 1503 1504 int 1505 vfs_stdextattrctl(struct mount *mp, int cmd, struct vnode *filename_vp, 1506 int attrnamespace, const char *attrname) 1507 { 1508 1509 if (filename_vp != NULL) 1510 VOP_UNLOCK(filename_vp); 1511 return (EOPNOTSUPP); 1512 } 1513 1514 int 1515 vfs_stdsysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req) 1516 { 1517 1518 return (EOPNOTSUPP); 1519 } 1520 1521 static vop_bypass_t * 1522 bp_by_off(struct vop_vector *vop, struct vop_generic_args *a) 1523 { 1524 1525 return (*(vop_bypass_t **)((char *)vop + a->a_desc->vdesc_vop_offset)); 1526 } 1527 1528 int 1529 vop_sigdefer(struct vop_vector *vop, struct vop_generic_args *a) 1530 { 1531 vop_bypass_t *bp; 1532 int prev_stops, rc; 1533 1534 bp = bp_by_off(vop, a); 1535 MPASS(bp != NULL); 1536 1537 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT); 1538 rc = bp(a); 1539 sigallowstop(prev_stops); 1540 return (rc); 1541 } 1542 1543 static int 1544 vop_stdstat(struct vop_stat_args *a) 1545 { 1546 struct vattr vattr; 1547 struct vattr *vap; 1548 struct vnode *vp; 1549 struct stat *sb; 1550 int error; 1551 u_short mode; 1552 1553 vp = a->a_vp; 1554 sb = a->a_sb; 1555 1556 error = vop_stat_helper_pre(a); 1557 if (error != 0) 1558 return (error); 1559 1560 vap = &vattr; 1561 1562 /* 1563 * Initialize defaults for new and unusual fields, so that file 1564 * systems which don't support these fields don't need to know 1565 * about them. 1566 */ 1567 vap->va_birthtime.tv_sec = -1; 1568 vap->va_birthtime.tv_nsec = 0; 1569 vap->va_fsid = VNOVAL; 1570 vap->va_gen = 0; 1571 vap->va_rdev = NODEV; 1572 1573 error = VOP_GETATTR(vp, vap, a->a_active_cred); 1574 if (error) 1575 goto out; 1576 1577 /* 1578 * Zero the spare stat fields 1579 */ 1580 bzero(sb, sizeof *sb); 1581 1582 /* 1583 * Copy from vattr table 1584 */ 1585 if (vap->va_fsid != VNOVAL) 1586 sb->st_dev = vap->va_fsid; 1587 else 1588 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 1589 sb->st_ino = vap->va_fileid; 1590 mode = vap->va_mode; 1591 switch (vap->va_type) { 1592 case VREG: 1593 mode |= S_IFREG; 1594 break; 1595 case VDIR: 1596 mode |= S_IFDIR; 1597 break; 1598 case VBLK: 1599 mode |= S_IFBLK; 1600 break; 1601 case VCHR: 1602 mode |= S_IFCHR; 1603 break; 1604 case VLNK: 1605 mode |= S_IFLNK; 1606 break; 1607 case VSOCK: 1608 mode |= S_IFSOCK; 1609 break; 1610 case VFIFO: 1611 mode |= S_IFIFO; 1612 break; 1613 default: 1614 error = EBADF; 1615 goto out; 1616 } 1617 sb->st_mode = mode; 1618 sb->st_nlink = vap->va_nlink; 1619 sb->st_uid = vap->va_uid; 1620 sb->st_gid = vap->va_gid; 1621 sb->st_rdev = vap->va_rdev; 1622 if (vap->va_size > OFF_MAX) { 1623 error = EOVERFLOW; 1624 goto out; 1625 } 1626 sb->st_size = vap->va_size; 1627 sb->st_atim.tv_sec = vap->va_atime.tv_sec; 1628 sb->st_atim.tv_nsec = vap->va_atime.tv_nsec; 1629 sb->st_mtim.tv_sec = vap->va_mtime.tv_sec; 1630 sb->st_mtim.tv_nsec = vap->va_mtime.tv_nsec; 1631 sb->st_ctim.tv_sec = vap->va_ctime.tv_sec; 1632 sb->st_ctim.tv_nsec = vap->va_ctime.tv_nsec; 1633 sb->st_birthtim.tv_sec = vap->va_birthtime.tv_sec; 1634 sb->st_birthtim.tv_nsec = vap->va_birthtime.tv_nsec; 1635 1636 /* 1637 * According to www.opengroup.org, the meaning of st_blksize is 1638 * "a filesystem-specific preferred I/O block size for this 1639 * object. In some filesystem types, this may vary from file 1640 * to file" 1641 * Use minimum/default of PAGE_SIZE (e.g. for VCHR). 1642 */ 1643 1644 sb->st_blksize = max(PAGE_SIZE, vap->va_blocksize); 1645 sb->st_flags = vap->va_flags; 1646 sb->st_blocks = vap->va_bytes / S_BLKSIZE; 1647 sb->st_gen = vap->va_gen; 1648 out: 1649 return (vop_stat_helper_post(a, error)); 1650 } 1651 1652 static int 1653 vop_stdread_pgcache(struct vop_read_pgcache_args *ap __unused) 1654 { 1655 return (EJUSTRETURN); 1656 } 1657 1658 static int 1659 vop_stdvput_pair(struct vop_vput_pair_args *ap) 1660 { 1661 struct vnode *dvp, *vp, **vpp; 1662 1663 dvp = ap->a_dvp; 1664 vpp = ap->a_vpp; 1665 vput(dvp); 1666 if (vpp != NULL && ap->a_unlock_vp && (vp = *vpp) != NULL) 1667 vput(vp); 1668 return (0); 1669 } 1670