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 61 #include <security/mac/mac_framework.h> 62 63 #include <vm/vm.h> 64 #include <vm/vm_object.h> 65 #include <vm/vm_extern.h> 66 #include <vm/pmap.h> 67 #include <vm/vm_map.h> 68 #include <vm/vm_page.h> 69 #include <vm/vm_pager.h> 70 #include <vm/vnode_pager.h> 71 72 static int vop_nolookup(struct vop_lookup_args *); 73 static int vop_norename(struct vop_rename_args *); 74 static int vop_nostrategy(struct vop_strategy_args *); 75 static int get_next_dirent(struct vnode *vp, struct dirent **dpp, 76 char *dirbuf, int dirbuflen, off_t *off, 77 char **cpos, int *len, int *eofflag, 78 struct thread *td); 79 static int dirent_exists(struct vnode *vp, const char *dirname, 80 struct thread *td); 81 82 #define DIRENT_MINSIZE (sizeof(struct dirent) - (MAXNAMLEN+1) + 4) 83 84 static int vop_stdis_text(struct vop_is_text_args *ap); 85 static int vop_stdunset_text(struct vop_unset_text_args *ap); 86 static int vop_stdadd_writecount(struct vop_add_writecount_args *ap); 87 static int vop_stdcopy_file_range(struct vop_copy_file_range_args *ap); 88 static int vop_stdfdatasync(struct vop_fdatasync_args *ap); 89 static int vop_stdgetpages_async(struct vop_getpages_async_args *ap); 90 static int vop_stdioctl(struct vop_ioctl_args *ap); 91 92 /* 93 * This vnode table stores what we want to do if the filesystem doesn't 94 * implement a particular VOP. 95 * 96 * If there is no specific entry here, we will return EOPNOTSUPP. 97 * 98 * Note that every filesystem has to implement either vop_access 99 * or vop_accessx; failing to do so will result in immediate crash 100 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(), 101 * which calls vop_stdaccess() etc. 102 */ 103 104 struct vop_vector default_vnodeops = { 105 .vop_default = NULL, 106 .vop_bypass = VOP_EOPNOTSUPP, 107 108 .vop_access = vop_stdaccess, 109 .vop_accessx = vop_stdaccessx, 110 .vop_advise = vop_stdadvise, 111 .vop_advlock = vop_stdadvlock, 112 .vop_advlockasync = vop_stdadvlockasync, 113 .vop_advlockpurge = vop_stdadvlockpurge, 114 .vop_allocate = vop_stdallocate, 115 .vop_bmap = vop_stdbmap, 116 .vop_close = VOP_NULL, 117 .vop_fsync = VOP_NULL, 118 .vop_fdatasync = vop_stdfdatasync, 119 .vop_getpages = vop_stdgetpages, 120 .vop_getpages_async = vop_stdgetpages_async, 121 .vop_getwritemount = vop_stdgetwritemount, 122 .vop_inactive = VOP_NULL, 123 .vop_need_inactive = vop_stdneed_inactive, 124 .vop_ioctl = vop_stdioctl, 125 .vop_kqfilter = vop_stdkqfilter, 126 .vop_islocked = vop_stdislocked, 127 .vop_lock1 = vop_stdlock, 128 .vop_lookup = vop_nolookup, 129 .vop_open = VOP_NULL, 130 .vop_pathconf = VOP_EINVAL, 131 .vop_poll = vop_nopoll, 132 .vop_putpages = vop_stdputpages, 133 .vop_readlink = VOP_EINVAL, 134 .vop_rename = vop_norename, 135 .vop_revoke = VOP_PANIC, 136 .vop_strategy = vop_nostrategy, 137 .vop_unlock = vop_stdunlock, 138 .vop_vptocnp = vop_stdvptocnp, 139 .vop_vptofh = vop_stdvptofh, 140 .vop_unp_bind = vop_stdunp_bind, 141 .vop_unp_connect = vop_stdunp_connect, 142 .vop_unp_detach = vop_stdunp_detach, 143 .vop_is_text = vop_stdis_text, 144 .vop_set_text = vop_stdset_text, 145 .vop_unset_text = vop_stdunset_text, 146 .vop_add_writecount = vop_stdadd_writecount, 147 .vop_copy_file_range = vop_stdcopy_file_range, 148 }; 149 150 /* 151 * Series of placeholder functions for various error returns for 152 * VOPs. 153 */ 154 155 int 156 vop_eopnotsupp(struct vop_generic_args *ap) 157 { 158 /* 159 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 160 */ 161 162 return (EOPNOTSUPP); 163 } 164 165 int 166 vop_ebadf(struct vop_generic_args *ap) 167 { 168 169 return (EBADF); 170 } 171 172 int 173 vop_enotty(struct vop_generic_args *ap) 174 { 175 176 return (ENOTTY); 177 } 178 179 int 180 vop_einval(struct vop_generic_args *ap) 181 { 182 183 return (EINVAL); 184 } 185 186 int 187 vop_enoent(struct vop_generic_args *ap) 188 { 189 190 return (ENOENT); 191 } 192 193 int 194 vop_null(struct vop_generic_args *ap) 195 { 196 197 return (0); 198 } 199 200 /* 201 * Helper function to panic on some bad VOPs in some filesystems. 202 */ 203 int 204 vop_panic(struct vop_generic_args *ap) 205 { 206 207 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 208 } 209 210 /* 211 * vop_std<something> and vop_no<something> are default functions for use by 212 * filesystems that need the "default reasonable" implementation for a 213 * particular operation. 214 * 215 * The documentation for the operations they implement exists (if it exists) 216 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 217 */ 218 219 /* 220 * Default vop for filesystems that do not support name lookup 221 */ 222 static int 223 vop_nolookup(ap) 224 struct vop_lookup_args /* { 225 struct vnode *a_dvp; 226 struct vnode **a_vpp; 227 struct componentname *a_cnp; 228 } */ *ap; 229 { 230 231 *ap->a_vpp = NULL; 232 return (ENOTDIR); 233 } 234 235 /* 236 * vop_norename: 237 * 238 * Handle unlock and reference counting for arguments of vop_rename 239 * for filesystems that do not implement rename operation. 240 */ 241 static int 242 vop_norename(struct vop_rename_args *ap) 243 { 244 245 vop_rename_fail(ap); 246 return (EOPNOTSUPP); 247 } 248 249 /* 250 * vop_nostrategy: 251 * 252 * Strategy routine for VFS devices that have none. 253 * 254 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 255 * routine. Typically this is done for a BIO_READ strategy call. 256 * Typically B_INVAL is assumed to already be clear prior to a write 257 * and should not be cleared manually unless you just made the buffer 258 * invalid. BIO_ERROR should be cleared either way. 259 */ 260 261 static int 262 vop_nostrategy (struct vop_strategy_args *ap) 263 { 264 printf("No strategy for buffer at %p\n", ap->a_bp); 265 vn_printf(ap->a_vp, "vnode "); 266 ap->a_bp->b_ioflags |= BIO_ERROR; 267 ap->a_bp->b_error = EOPNOTSUPP; 268 bufdone(ap->a_bp); 269 return (EOPNOTSUPP); 270 } 271 272 static int 273 get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf, 274 int dirbuflen, off_t *off, char **cpos, int *len, 275 int *eofflag, struct thread *td) 276 { 277 int error, reclen; 278 struct uio uio; 279 struct iovec iov; 280 struct dirent *dp; 281 282 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 283 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 284 285 if (*len == 0) { 286 iov.iov_base = dirbuf; 287 iov.iov_len = dirbuflen; 288 289 uio.uio_iov = &iov; 290 uio.uio_iovcnt = 1; 291 uio.uio_offset = *off; 292 uio.uio_resid = dirbuflen; 293 uio.uio_segflg = UIO_SYSSPACE; 294 uio.uio_rw = UIO_READ; 295 uio.uio_td = td; 296 297 *eofflag = 0; 298 299 #ifdef MAC 300 error = mac_vnode_check_readdir(td->td_ucred, vp); 301 if (error == 0) 302 #endif 303 error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag, 304 NULL, NULL); 305 if (error) 306 return (error); 307 308 *off = uio.uio_offset; 309 310 *cpos = dirbuf; 311 *len = (dirbuflen - uio.uio_resid); 312 313 if (*len == 0) 314 return (ENOENT); 315 } 316 317 dp = (struct dirent *)(*cpos); 318 reclen = dp->d_reclen; 319 *dpp = dp; 320 321 /* check for malformed directory.. */ 322 if (reclen < DIRENT_MINSIZE) 323 return (EINVAL); 324 325 *cpos += reclen; 326 *len -= reclen; 327 328 return (0); 329 } 330 331 /* 332 * Check if a named file exists in a given directory vnode. 333 */ 334 static int 335 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 336 { 337 char *dirbuf, *cpos; 338 int error, eofflag, dirbuflen, len, found; 339 off_t off; 340 struct dirent *dp; 341 struct vattr va; 342 343 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 344 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 345 346 found = 0; 347 348 error = VOP_GETATTR(vp, &va, td->td_ucred); 349 if (error) 350 return (found); 351 352 dirbuflen = DEV_BSIZE; 353 if (dirbuflen < va.va_blocksize) 354 dirbuflen = va.va_blocksize; 355 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 356 357 off = 0; 358 len = 0; 359 do { 360 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off, 361 &cpos, &len, &eofflag, td); 362 if (error) 363 goto out; 364 365 if (dp->d_type != DT_WHT && dp->d_fileno != 0 && 366 strcmp(dp->d_name, dirname) == 0) { 367 found = 1; 368 goto out; 369 } 370 } while (len > 0 || !eofflag); 371 372 out: 373 free(dirbuf, M_TEMP); 374 return (found); 375 } 376 377 int 378 vop_stdaccess(struct vop_access_args *ap) 379 { 380 381 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | 382 VAPPEND)) == 0, ("invalid bit in accmode")); 383 384 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td)); 385 } 386 387 int 388 vop_stdaccessx(struct vop_accessx_args *ap) 389 { 390 int error; 391 accmode_t accmode = ap->a_accmode; 392 393 error = vfs_unixify_accmode(&accmode); 394 if (error != 0) 395 return (error); 396 397 if (accmode == 0) 398 return (0); 399 400 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 401 } 402 403 /* 404 * Advisory record locking support 405 */ 406 int 407 vop_stdadvlock(struct vop_advlock_args *ap) 408 { 409 struct vnode *vp; 410 struct vattr vattr; 411 int error; 412 413 vp = ap->a_vp; 414 if (ap->a_fl->l_whence == SEEK_END) { 415 /* 416 * The NFSv4 server must avoid doing a vn_lock() here, since it 417 * can deadlock the nfsd threads, due to a LOR. Fortunately 418 * the NFSv4 server always uses SEEK_SET and this code is 419 * only required for the SEEK_END case. 420 */ 421 vn_lock(vp, LK_SHARED | LK_RETRY); 422 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 423 VOP_UNLOCK(vp, 0); 424 if (error) 425 return (error); 426 } else 427 vattr.va_size = 0; 428 429 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size)); 430 } 431 432 int 433 vop_stdadvlockasync(struct vop_advlockasync_args *ap) 434 { 435 struct vnode *vp; 436 struct vattr vattr; 437 int error; 438 439 vp = ap->a_vp; 440 if (ap->a_fl->l_whence == SEEK_END) { 441 /* The size argument is only needed for SEEK_END. */ 442 vn_lock(vp, LK_SHARED | LK_RETRY); 443 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 444 VOP_UNLOCK(vp, 0); 445 if (error) 446 return (error); 447 } else 448 vattr.va_size = 0; 449 450 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 451 } 452 453 int 454 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap) 455 { 456 struct vnode *vp; 457 458 vp = ap->a_vp; 459 lf_purgelocks(vp, &vp->v_lockf); 460 return (0); 461 } 462 463 /* 464 * vop_stdpathconf: 465 * 466 * Standard implementation of POSIX pathconf, to get information about limits 467 * for a filesystem. 468 * Override per filesystem for the case where the filesystem has smaller 469 * limits. 470 */ 471 int 472 vop_stdpathconf(ap) 473 struct vop_pathconf_args /* { 474 struct vnode *a_vp; 475 int a_name; 476 int *a_retval; 477 } */ *ap; 478 { 479 480 switch (ap->a_name) { 481 case _PC_ASYNC_IO: 482 *ap->a_retval = _POSIX_ASYNCHRONOUS_IO; 483 return (0); 484 case _PC_PATH_MAX: 485 *ap->a_retval = PATH_MAX; 486 return (0); 487 case _PC_ACL_EXTENDED: 488 case _PC_ACL_NFS4: 489 case _PC_CAP_PRESENT: 490 case _PC_INF_PRESENT: 491 case _PC_MAC_PRESENT: 492 *ap->a_retval = 0; 493 return (0); 494 default: 495 return (EINVAL); 496 } 497 /* NOTREACHED */ 498 } 499 500 /* 501 * Standard lock, unlock and islocked functions. 502 */ 503 int 504 vop_stdlock(ap) 505 struct vop_lock1_args /* { 506 struct vnode *a_vp; 507 int a_flags; 508 char *file; 509 int line; 510 } */ *ap; 511 { 512 struct vnode *vp = ap->a_vp; 513 struct mtx *ilk; 514 515 ilk = VI_MTX(vp); 516 return (lockmgr_lock_fast_path(vp->v_vnlock, ap->a_flags, 517 &ilk->lock_object, ap->a_file, ap->a_line)); 518 } 519 520 /* See above. */ 521 int 522 vop_stdunlock(ap) 523 struct vop_unlock_args /* { 524 struct vnode *a_vp; 525 int a_flags; 526 } */ *ap; 527 { 528 struct vnode *vp = ap->a_vp; 529 struct mtx *ilk; 530 531 ilk = VI_MTX(vp); 532 return (lockmgr_unlock_fast_path(vp->v_vnlock, ap->a_flags, 533 &ilk->lock_object)); 534 } 535 536 /* See above. */ 537 int 538 vop_stdislocked(ap) 539 struct vop_islocked_args /* { 540 struct vnode *a_vp; 541 } */ *ap; 542 { 543 544 return (lockstatus(ap->a_vp->v_vnlock)); 545 } 546 547 /* 548 * Return true for select/poll. 549 */ 550 int 551 vop_nopoll(ap) 552 struct vop_poll_args /* { 553 struct vnode *a_vp; 554 int a_events; 555 struct ucred *a_cred; 556 struct thread *a_td; 557 } */ *ap; 558 { 559 560 return (poll_no_poll(ap->a_events)); 561 } 562 563 /* 564 * Implement poll for local filesystems that support it. 565 */ 566 int 567 vop_stdpoll(ap) 568 struct vop_poll_args /* { 569 struct vnode *a_vp; 570 int a_events; 571 struct ucred *a_cred; 572 struct thread *a_td; 573 } */ *ap; 574 { 575 if (ap->a_events & ~POLLSTANDARD) 576 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 577 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 578 } 579 580 /* 581 * Return our mount point, as we will take charge of the writes. 582 */ 583 int 584 vop_stdgetwritemount(ap) 585 struct vop_getwritemount_args /* { 586 struct vnode *a_vp; 587 struct mount **a_mpp; 588 } */ *ap; 589 { 590 struct mount *mp; 591 struct vnode *vp; 592 593 /* 594 * Note that having a reference does not prevent forced unmount from 595 * setting ->v_mount to NULL after the lock gets released. This is of 596 * no consequence for typical consumers (most notably vn_start_write) 597 * since in this case the vnode is VI_DOOMED. Unmount might have 598 * progressed far enough that its completion is only delayed by the 599 * reference obtained here. The consumer only needs to concern itself 600 * with releasing it. 601 */ 602 vp = ap->a_vp; 603 mp = vp->v_mount; 604 if (mp == NULL) { 605 *(ap->a_mpp) = NULL; 606 return (0); 607 } 608 if (vfs_op_thread_enter(mp)) { 609 if (mp == vp->v_mount) 610 vfs_mp_count_add_pcpu(mp, ref, 1); 611 else 612 mp = NULL; 613 vfs_op_thread_exit(mp); 614 } else { 615 MNT_ILOCK(mp); 616 if (mp == vp->v_mount) { 617 MNT_REF(mp); 618 MNT_IUNLOCK(mp); 619 } else { 620 MNT_IUNLOCK(mp); 621 mp = NULL; 622 } 623 } 624 *(ap->a_mpp) = mp; 625 return (0); 626 } 627 628 /* 629 * If the file system doesn't implement VOP_BMAP, then return sensible defaults: 630 * - Return the vnode's bufobj instead of any underlying device's bufobj 631 * - Calculate the physical block number as if there were equal size 632 * consecutive blocks, but 633 * - Report no contiguous runs of blocks. 634 */ 635 int 636 vop_stdbmap(ap) 637 struct vop_bmap_args /* { 638 struct vnode *a_vp; 639 daddr_t a_bn; 640 struct bufobj **a_bop; 641 daddr_t *a_bnp; 642 int *a_runp; 643 int *a_runb; 644 } */ *ap; 645 { 646 647 if (ap->a_bop != NULL) 648 *ap->a_bop = &ap->a_vp->v_bufobj; 649 if (ap->a_bnp != NULL) 650 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 651 if (ap->a_runp != NULL) 652 *ap->a_runp = 0; 653 if (ap->a_runb != NULL) 654 *ap->a_runb = 0; 655 return (0); 656 } 657 658 int 659 vop_stdfsync(ap) 660 struct vop_fsync_args /* { 661 struct vnode *a_vp; 662 int a_waitfor; 663 struct thread *a_td; 664 } */ *ap; 665 { 666 667 return (vn_fsync_buf(ap->a_vp, ap->a_waitfor)); 668 } 669 670 static int 671 vop_stdfdatasync(struct vop_fdatasync_args *ap) 672 { 673 674 return (VOP_FSYNC(ap->a_vp, MNT_WAIT, ap->a_td)); 675 } 676 677 int 678 vop_stdfdatasync_buf(struct vop_fdatasync_args *ap) 679 { 680 681 return (vn_fsync_buf(ap->a_vp, MNT_WAIT)); 682 } 683 684 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 685 int 686 vop_stdgetpages(ap) 687 struct vop_getpages_args /* { 688 struct vnode *a_vp; 689 vm_page_t *a_m; 690 int a_count; 691 int *a_rbehind; 692 int *a_rahead; 693 } */ *ap; 694 { 695 696 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 697 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL); 698 } 699 700 static int 701 vop_stdgetpages_async(struct vop_getpages_async_args *ap) 702 { 703 int error; 704 705 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind, 706 ap->a_rahead); 707 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error); 708 return (error); 709 } 710 711 int 712 vop_stdkqfilter(struct vop_kqfilter_args *ap) 713 { 714 return vfs_kqfilter(ap); 715 } 716 717 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 718 int 719 vop_stdputpages(ap) 720 struct vop_putpages_args /* { 721 struct vnode *a_vp; 722 vm_page_t *a_m; 723 int a_count; 724 int a_sync; 725 int *a_rtvals; 726 } */ *ap; 727 { 728 729 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 730 ap->a_sync, ap->a_rtvals); 731 } 732 733 int 734 vop_stdvptofh(struct vop_vptofh_args *ap) 735 { 736 return (EOPNOTSUPP); 737 } 738 739 int 740 vop_stdvptocnp(struct vop_vptocnp_args *ap) 741 { 742 struct vnode *vp = ap->a_vp; 743 struct vnode **dvp = ap->a_vpp; 744 struct ucred *cred = ap->a_cred; 745 char *buf = ap->a_buf; 746 int *buflen = ap->a_buflen; 747 char *dirbuf, *cpos; 748 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 749 off_t off; 750 ino_t fileno; 751 struct vattr va; 752 struct nameidata nd; 753 struct thread *td; 754 struct dirent *dp; 755 struct vnode *mvp; 756 757 i = *buflen; 758 error = 0; 759 covered = 0; 760 td = curthread; 761 762 if (vp->v_type != VDIR) 763 return (ENOENT); 764 765 error = VOP_GETATTR(vp, &va, cred); 766 if (error) 767 return (error); 768 769 VREF(vp); 770 locked = VOP_ISLOCKED(vp); 771 VOP_UNLOCK(vp, 0); 772 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE, 773 "..", vp, td); 774 flags = FREAD; 775 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 776 if (error) { 777 vn_lock(vp, locked | LK_RETRY); 778 return (error); 779 } 780 NDFREE(&nd, NDF_ONLY_PNBUF); 781 782 mvp = *dvp = nd.ni_vp; 783 784 if (vp->v_mount != (*dvp)->v_mount && 785 ((*dvp)->v_vflag & VV_ROOT) && 786 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 787 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 788 VREF(mvp); 789 VOP_UNLOCK(mvp, 0); 790 vn_close(mvp, FREAD, cred, td); 791 VREF(*dvp); 792 vn_lock(*dvp, LK_SHARED | LK_RETRY); 793 covered = 1; 794 } 795 796 fileno = va.va_fileid; 797 798 dirbuflen = DEV_BSIZE; 799 if (dirbuflen < va.va_blocksize) 800 dirbuflen = va.va_blocksize; 801 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 802 803 if ((*dvp)->v_type != VDIR) { 804 error = ENOENT; 805 goto out; 806 } 807 808 off = 0; 809 len = 0; 810 do { 811 /* call VOP_READDIR of parent */ 812 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 813 &cpos, &len, &eofflag, td); 814 if (error) 815 goto out; 816 817 if ((dp->d_type != DT_WHT) && 818 (dp->d_fileno == fileno)) { 819 if (covered) { 820 VOP_UNLOCK(*dvp, 0); 821 vn_lock(mvp, LK_SHARED | LK_RETRY); 822 if (dirent_exists(mvp, dp->d_name, td)) { 823 error = ENOENT; 824 VOP_UNLOCK(mvp, 0); 825 vn_lock(*dvp, LK_SHARED | LK_RETRY); 826 goto out; 827 } 828 VOP_UNLOCK(mvp, 0); 829 vn_lock(*dvp, LK_SHARED | LK_RETRY); 830 } 831 i -= dp->d_namlen; 832 833 if (i < 0) { 834 error = ENOMEM; 835 goto out; 836 } 837 if (dp->d_namlen == 1 && dp->d_name[0] == '.') { 838 error = ENOENT; 839 } else { 840 bcopy(dp->d_name, buf + i, dp->d_namlen); 841 error = 0; 842 } 843 goto out; 844 } 845 } while (len > 0 || !eofflag); 846 error = ENOENT; 847 848 out: 849 free(dirbuf, M_TEMP); 850 if (!error) { 851 *buflen = i; 852 vref(*dvp); 853 } 854 if (covered) { 855 vput(*dvp); 856 vrele(mvp); 857 } else { 858 VOP_UNLOCK(mvp, 0); 859 vn_close(mvp, FREAD, cred, td); 860 } 861 vn_lock(vp, locked | LK_RETRY); 862 return (error); 863 } 864 865 int 866 vop_stdallocate(struct vop_allocate_args *ap) 867 { 868 #ifdef __notyet__ 869 struct statfs *sfs; 870 off_t maxfilesize = 0; 871 #endif 872 struct iovec aiov; 873 struct vattr vattr, *vap; 874 struct uio auio; 875 off_t fsize, len, cur, offset; 876 uint8_t *buf; 877 struct thread *td; 878 struct vnode *vp; 879 size_t iosize; 880 int error; 881 882 buf = NULL; 883 error = 0; 884 td = curthread; 885 vap = &vattr; 886 vp = ap->a_vp; 887 len = *ap->a_len; 888 offset = *ap->a_offset; 889 890 error = VOP_GETATTR(vp, vap, td->td_ucred); 891 if (error != 0) 892 goto out; 893 fsize = vap->va_size; 894 iosize = vap->va_blocksize; 895 if (iosize == 0) 896 iosize = BLKDEV_IOSIZE; 897 if (iosize > MAXPHYS) 898 iosize = MAXPHYS; 899 buf = malloc(iosize, M_TEMP, M_WAITOK); 900 901 #ifdef __notyet__ 902 /* 903 * Check if the filesystem sets f_maxfilesize; if not use 904 * VOP_SETATTR to perform the check. 905 */ 906 sfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 907 error = VFS_STATFS(vp->v_mount, sfs, td); 908 if (error == 0) 909 maxfilesize = sfs->f_maxfilesize; 910 free(sfs, M_STATFS); 911 if (error != 0) 912 goto out; 913 if (maxfilesize) { 914 if (offset > maxfilesize || len > maxfilesize || 915 offset + len > maxfilesize) { 916 error = EFBIG; 917 goto out; 918 } 919 } else 920 #endif 921 if (offset + len > vap->va_size) { 922 /* 923 * Test offset + len against the filesystem's maxfilesize. 924 */ 925 VATTR_NULL(vap); 926 vap->va_size = offset + len; 927 error = VOP_SETATTR(vp, vap, td->td_ucred); 928 if (error != 0) 929 goto out; 930 VATTR_NULL(vap); 931 vap->va_size = fsize; 932 error = VOP_SETATTR(vp, vap, td->td_ucred); 933 if (error != 0) 934 goto out; 935 } 936 937 for (;;) { 938 /* 939 * Read and write back anything below the nominal file 940 * size. There's currently no way outside the filesystem 941 * to know whether this area is sparse or not. 942 */ 943 cur = iosize; 944 if ((offset % iosize) != 0) 945 cur -= (offset % iosize); 946 if (cur > len) 947 cur = len; 948 if (offset < fsize) { 949 aiov.iov_base = buf; 950 aiov.iov_len = cur; 951 auio.uio_iov = &aiov; 952 auio.uio_iovcnt = 1; 953 auio.uio_offset = offset; 954 auio.uio_resid = cur; 955 auio.uio_segflg = UIO_SYSSPACE; 956 auio.uio_rw = UIO_READ; 957 auio.uio_td = td; 958 error = VOP_READ(vp, &auio, 0, td->td_ucred); 959 if (error != 0) 960 break; 961 if (auio.uio_resid > 0) { 962 bzero(buf + cur - auio.uio_resid, 963 auio.uio_resid); 964 } 965 } else { 966 bzero(buf, cur); 967 } 968 969 aiov.iov_base = buf; 970 aiov.iov_len = cur; 971 auio.uio_iov = &aiov; 972 auio.uio_iovcnt = 1; 973 auio.uio_offset = offset; 974 auio.uio_resid = cur; 975 auio.uio_segflg = UIO_SYSSPACE; 976 auio.uio_rw = UIO_WRITE; 977 auio.uio_td = td; 978 979 error = VOP_WRITE(vp, &auio, 0, td->td_ucred); 980 if (error != 0) 981 break; 982 983 len -= cur; 984 offset += cur; 985 if (len == 0) 986 break; 987 if (should_yield()) 988 break; 989 } 990 991 out: 992 *ap->a_len = len; 993 *ap->a_offset = offset; 994 free(buf, M_TEMP); 995 return (error); 996 } 997 998 int 999 vop_stdadvise(struct vop_advise_args *ap) 1000 { 1001 struct vnode *vp; 1002 struct bufobj *bo; 1003 daddr_t startn, endn; 1004 off_t bstart, bend, start, end; 1005 int bsize, error; 1006 1007 vp = ap->a_vp; 1008 switch (ap->a_advice) { 1009 case POSIX_FADV_WILLNEED: 1010 /* 1011 * Do nothing for now. Filesystems should provide a 1012 * custom method which starts an asynchronous read of 1013 * the requested region. 1014 */ 1015 error = 0; 1016 break; 1017 case POSIX_FADV_DONTNEED: 1018 error = 0; 1019 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1020 if (vp->v_iflag & VI_DOOMED) { 1021 VOP_UNLOCK(vp, 0); 1022 break; 1023 } 1024 1025 /* 1026 * Round to block boundaries (and later possibly further to 1027 * page boundaries). Applications cannot reasonably be aware 1028 * of the boundaries, and the rounding must be to expand at 1029 * both extremities to cover enough. It still doesn't cover 1030 * read-ahead. For partial blocks, this gives unnecessary 1031 * discarding of buffers but is efficient enough since the 1032 * pages usually remain in VMIO for some time. 1033 */ 1034 bsize = vp->v_bufobj.bo_bsize; 1035 bstart = rounddown(ap->a_start, bsize); 1036 bend = roundup(ap->a_end, bsize); 1037 1038 /* 1039 * Deactivate pages in the specified range from the backing VM 1040 * object. Pages that are resident in the buffer cache will 1041 * remain wired until their corresponding buffers are released 1042 * below. 1043 */ 1044 if (vp->v_object != NULL) { 1045 start = trunc_page(bstart); 1046 end = round_page(bend); 1047 VM_OBJECT_RLOCK(vp->v_object); 1048 vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start), 1049 OFF_TO_IDX(end)); 1050 VM_OBJECT_RUNLOCK(vp->v_object); 1051 } 1052 1053 bo = &vp->v_bufobj; 1054 BO_RLOCK(bo); 1055 startn = bstart / bsize; 1056 endn = bend / bsize; 1057 error = bnoreuselist(&bo->bo_clean, bo, startn, endn); 1058 if (error == 0) 1059 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn); 1060 BO_RUNLOCK(bo); 1061 VOP_UNLOCK(vp, 0); 1062 break; 1063 default: 1064 error = EINVAL; 1065 break; 1066 } 1067 return (error); 1068 } 1069 1070 int 1071 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1072 { 1073 1074 ap->a_vp->v_unpcb = ap->a_unpcb; 1075 return (0); 1076 } 1077 1078 int 1079 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1080 { 1081 1082 *ap->a_unpcb = ap->a_vp->v_unpcb; 1083 return (0); 1084 } 1085 1086 int 1087 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1088 { 1089 1090 ap->a_vp->v_unpcb = NULL; 1091 return (0); 1092 } 1093 1094 static int 1095 vop_stdis_text(struct vop_is_text_args *ap) 1096 { 1097 1098 return (ap->a_vp->v_writecount < 0); 1099 } 1100 1101 int 1102 vop_stdset_text(struct vop_set_text_args *ap) 1103 { 1104 struct vnode *vp; 1105 struct mount *mp; 1106 int error; 1107 1108 vp = ap->a_vp; 1109 VI_LOCK(vp); 1110 if (vp->v_writecount > 0) { 1111 error = ETXTBSY; 1112 } else { 1113 /* 1114 * If requested by fs, keep a use reference to the 1115 * vnode until the last text reference is released. 1116 */ 1117 mp = vp->v_mount; 1118 if (mp != NULL && (mp->mnt_kern_flag & MNTK_TEXT_REFS) != 0 && 1119 vp->v_writecount == 0) { 1120 vp->v_iflag |= VI_TEXT_REF; 1121 vrefl(vp); 1122 } 1123 1124 vp->v_writecount--; 1125 error = 0; 1126 } 1127 VI_UNLOCK(vp); 1128 return (error); 1129 } 1130 1131 static int 1132 vop_stdunset_text(struct vop_unset_text_args *ap) 1133 { 1134 struct vnode *vp; 1135 int error; 1136 bool last; 1137 1138 vp = ap->a_vp; 1139 last = false; 1140 VI_LOCK(vp); 1141 if (vp->v_writecount < 0) { 1142 if ((vp->v_iflag & VI_TEXT_REF) != 0 && 1143 vp->v_writecount == -1) { 1144 last = true; 1145 vp->v_iflag &= ~VI_TEXT_REF; 1146 } 1147 vp->v_writecount++; 1148 error = 0; 1149 } else { 1150 error = EINVAL; 1151 } 1152 VI_UNLOCK(vp); 1153 if (last) 1154 vunref(vp); 1155 return (error); 1156 } 1157 1158 static int 1159 vop_stdadd_writecount(struct vop_add_writecount_args *ap) 1160 { 1161 struct vnode *vp; 1162 int error; 1163 1164 vp = ap->a_vp; 1165 VI_LOCK_FLAGS(vp, MTX_DUPOK); 1166 if (vp->v_writecount < 0) { 1167 error = ETXTBSY; 1168 } else { 1169 VNASSERT(vp->v_writecount + ap->a_inc >= 0, vp, 1170 ("neg writecount increment %d", ap->a_inc)); 1171 vp->v_writecount += ap->a_inc; 1172 error = 0; 1173 } 1174 VI_UNLOCK(vp); 1175 return (error); 1176 } 1177 1178 int 1179 vop_stdneed_inactive(struct vop_need_inactive_args *ap) 1180 { 1181 1182 return (1); 1183 } 1184 1185 static int 1186 vop_stdioctl(struct vop_ioctl_args *ap) 1187 { 1188 struct vnode *vp; 1189 struct vattr va; 1190 off_t *offp; 1191 int error; 1192 1193 switch (ap->a_command) { 1194 case FIOSEEKDATA: 1195 case FIOSEEKHOLE: 1196 vp = ap->a_vp; 1197 error = vn_lock(vp, LK_SHARED); 1198 if (error != 0) 1199 return (EBADF); 1200 if (vp->v_type == VREG) 1201 error = VOP_GETATTR(vp, &va, ap->a_cred); 1202 else 1203 error = ENOTTY; 1204 if (error == 0) { 1205 offp = ap->a_data; 1206 if (*offp < 0 || *offp >= va.va_size) 1207 error = ENXIO; 1208 else if (ap->a_command == FIOSEEKHOLE) 1209 *offp = va.va_size; 1210 } 1211 VOP_UNLOCK(vp, 0); 1212 break; 1213 default: 1214 error = ENOTTY; 1215 break; 1216 } 1217 return (error); 1218 } 1219 1220 /* 1221 * vfs default ops 1222 * used to fill the vfs function table to get reasonable default return values. 1223 */ 1224 int 1225 vfs_stdroot (mp, flags, vpp) 1226 struct mount *mp; 1227 int flags; 1228 struct vnode **vpp; 1229 { 1230 1231 return (EOPNOTSUPP); 1232 } 1233 1234 int 1235 vfs_stdstatfs (mp, sbp) 1236 struct mount *mp; 1237 struct statfs *sbp; 1238 { 1239 1240 return (EOPNOTSUPP); 1241 } 1242 1243 int 1244 vfs_stdquotactl (mp, cmds, uid, arg) 1245 struct mount *mp; 1246 int cmds; 1247 uid_t uid; 1248 void *arg; 1249 { 1250 1251 return (EOPNOTSUPP); 1252 } 1253 1254 int 1255 vfs_stdsync(mp, waitfor) 1256 struct mount *mp; 1257 int waitfor; 1258 { 1259 struct vnode *vp, *mvp; 1260 struct thread *td; 1261 int error, lockreq, allerror = 0; 1262 1263 td = curthread; 1264 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1265 if (waitfor != MNT_WAIT) 1266 lockreq |= LK_NOWAIT; 1267 /* 1268 * Force stale buffer cache information to be flushed. 1269 */ 1270 loop: 1271 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1272 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1273 VI_UNLOCK(vp); 1274 continue; 1275 } 1276 if ((error = vget(vp, lockreq, td)) != 0) { 1277 if (error == ENOENT) { 1278 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1279 goto loop; 1280 } 1281 continue; 1282 } 1283 error = VOP_FSYNC(vp, waitfor, td); 1284 if (error) 1285 allerror = error; 1286 vput(vp); 1287 } 1288 return (allerror); 1289 } 1290 1291 int 1292 vfs_stdnosync (mp, waitfor) 1293 struct mount *mp; 1294 int waitfor; 1295 { 1296 1297 return (0); 1298 } 1299 1300 static int 1301 vop_stdcopy_file_range(struct vop_copy_file_range_args *ap) 1302 { 1303 int error; 1304 1305 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp, 1306 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, ap->a_incred, 1307 ap->a_outcred, ap->a_fsizetd); 1308 return (error); 1309 } 1310 1311 int 1312 vfs_stdvget (mp, ino, flags, vpp) 1313 struct mount *mp; 1314 ino_t ino; 1315 int flags; 1316 struct vnode **vpp; 1317 { 1318 1319 return (EOPNOTSUPP); 1320 } 1321 1322 int 1323 vfs_stdfhtovp (mp, fhp, flags, vpp) 1324 struct mount *mp; 1325 struct fid *fhp; 1326 int flags; 1327 struct vnode **vpp; 1328 { 1329 1330 return (EOPNOTSUPP); 1331 } 1332 1333 int 1334 vfs_stdinit (vfsp) 1335 struct vfsconf *vfsp; 1336 { 1337 1338 return (0); 1339 } 1340 1341 int 1342 vfs_stduninit (vfsp) 1343 struct vfsconf *vfsp; 1344 { 1345 1346 return(0); 1347 } 1348 1349 int 1350 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 1351 struct mount *mp; 1352 int cmd; 1353 struct vnode *filename_vp; 1354 int attrnamespace; 1355 const char *attrname; 1356 { 1357 1358 if (filename_vp != NULL) 1359 VOP_UNLOCK(filename_vp, 0); 1360 return (EOPNOTSUPP); 1361 } 1362 1363 int 1364 vfs_stdsysctl(mp, op, req) 1365 struct mount *mp; 1366 fsctlop_t op; 1367 struct sysctl_req *req; 1368 { 1369 1370 return (EOPNOTSUPP); 1371 } 1372 1373 static vop_bypass_t * 1374 bp_by_off(struct vop_vector *vop, struct vop_generic_args *a) 1375 { 1376 1377 return (*(vop_bypass_t **)((char *)vop + a->a_desc->vdesc_vop_offset)); 1378 } 1379 1380 int 1381 vop_sigdefer(struct vop_vector *vop, struct vop_generic_args *a) 1382 { 1383 vop_bypass_t *bp; 1384 int prev_stops, rc; 1385 1386 for (; vop != NULL; vop = vop->vop_default) { 1387 bp = bp_by_off(vop, a); 1388 if (bp != NULL) 1389 break; 1390 1391 /* 1392 * Bypass is not really supported. It is done for 1393 * fallback to unimplemented vops in the default 1394 * vector. 1395 */ 1396 bp = vop->vop_bypass; 1397 if (bp != NULL) 1398 break; 1399 } 1400 MPASS(bp != NULL); 1401 1402 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT); 1403 rc = bp(a); 1404 sigallowstop(prev_stops); 1405 return (rc); 1406 } 1407