Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/kern/vfs_default.c
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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: head/sys/kern/vfs_default.c 346065 2019-04-09 20:20:04Z kib $"); 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/kernel.h> 47 #include <sys/limits.h> 48 #include <sys/lock.h> 49 #include <sys/lockf.h> 50 #include <sys/malloc.h> 51 #include <sys/mount.h> 52 #include <sys/namei.h> 53 #include <sys/rwlock.h> 54 #include <sys/fcntl.h> 55 #include <sys/unistd.h> 56 #include <sys/vnode.h> 57 #include <sys/dirent.h> 58 #include <sys/poll.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 get_next_dirent(struct vnode *vp, struct dirent **dpp, 75 char *dirbuf, int dirbuflen, off_t *off, 76 char **cpos, int *len, int *eofflag, 77 struct thread *td); 78 static int dirent_exists(struct vnode *vp, const char *dirname, 79 struct thread *td); 80 81 #define DIRENT_MINSIZE (sizeof(struct dirent) - (MAXNAMLEN+1) + 4) 82 83 static int vop_stdis_text(struct vop_is_text_args *ap); 84 static int vop_stdset_text(struct vop_set_text_args *ap); 85 static int vop_stdunset_text(struct vop_unset_text_args *ap); 86 static int vop_stdget_writecount(struct vop_get_writecount_args *ap); 87 static int vop_stdadd_writecount(struct vop_add_writecount_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 91 /* 92 * This vnode table stores what we want to do if the filesystem doesn't 93 * implement a particular VOP. 94 * 95 * If there is no specific entry here, we will return EOPNOTSUPP. 96 * 97 * Note that every filesystem has to implement either vop_access 98 * or vop_accessx; failing to do so will result in immediate crash 99 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(), 100 * which calls vop_stdaccess() etc. 101 */ 102 103 struct vop_vector default_vnodeops = { 104 .vop_default = NULL, 105 .vop_bypass = VOP_EOPNOTSUPP, 106 107 .vop_access = vop_stdaccess, 108 .vop_accessx = vop_stdaccessx, 109 .vop_advise = vop_stdadvise, 110 .vop_advlock = vop_stdadvlock, 111 .vop_advlockasync = vop_stdadvlockasync, 112 .vop_advlockpurge = vop_stdadvlockpurge, 113 .vop_allocate = vop_stdallocate, 114 .vop_bmap = vop_stdbmap, 115 .vop_close = VOP_NULL, 116 .vop_fsync = VOP_NULL, 117 .vop_fdatasync = vop_stdfdatasync, 118 .vop_getpages = vop_stdgetpages, 119 .vop_getpages_async = vop_stdgetpages_async, 120 .vop_getwritemount = vop_stdgetwritemount, 121 .vop_inactive = VOP_NULL, 122 .vop_ioctl = VOP_ENOTTY, 123 .vop_kqfilter = vop_stdkqfilter, 124 .vop_islocked = vop_stdislocked, 125 .vop_lock1 = vop_stdlock, 126 .vop_lookup = vop_nolookup, 127 .vop_open = VOP_NULL, 128 .vop_pathconf = VOP_EINVAL, 129 .vop_poll = vop_nopoll, 130 .vop_putpages = vop_stdputpages, 131 .vop_readlink = VOP_EINVAL, 132 .vop_rename = vop_norename, 133 .vop_revoke = VOP_PANIC, 134 .vop_strategy = vop_nostrategy, 135 .vop_unlock = vop_stdunlock, 136 .vop_vptocnp = vop_stdvptocnp, 137 .vop_vptofh = vop_stdvptofh, 138 .vop_unp_bind = vop_stdunp_bind, 139 .vop_unp_connect = vop_stdunp_connect, 140 .vop_unp_detach = vop_stdunp_detach, 141 .vop_is_text = vop_stdis_text, 142 .vop_set_text = vop_stdset_text, 143 .vop_unset_text = vop_stdunset_text, 144 .vop_get_writecount = vop_stdget_writecount, 145 .vop_add_writecount = vop_stdadd_writecount, 146 }; 147 148 /* 149 * Series of placeholder functions for various error returns for 150 * VOPs. 151 */ 152 153 int 154 vop_eopnotsupp(struct vop_generic_args *ap) 155 { 156 /* 157 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 158 */ 159 160 return (EOPNOTSUPP); 161 } 162 163 int 164 vop_ebadf(struct vop_generic_args *ap) 165 { 166 167 return (EBADF); 168 } 169 170 int 171 vop_enotty(struct vop_generic_args *ap) 172 { 173 174 return (ENOTTY); 175 } 176 177 int 178 vop_einval(struct vop_generic_args *ap) 179 { 180 181 return (EINVAL); 182 } 183 184 int 185 vop_enoent(struct vop_generic_args *ap) 186 { 187 188 return (ENOENT); 189 } 190 191 int 192 vop_null(struct vop_generic_args *ap) 193 { 194 195 return (0); 196 } 197 198 /* 199 * Helper function to panic on some bad VOPs in some filesystems. 200 */ 201 int 202 vop_panic(struct vop_generic_args *ap) 203 { 204 205 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 206 } 207 208 /* 209 * vop_std<something> and vop_no<something> are default functions for use by 210 * filesystems that need the "default reasonable" implementation for a 211 * particular operation. 212 * 213 * The documentation for the operations they implement exists (if it exists) 214 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 215 */ 216 217 /* 218 * Default vop for filesystems that do not support name lookup 219 */ 220 static int 221 vop_nolookup(ap) 222 struct vop_lookup_args /* { 223 struct vnode *a_dvp; 224 struct vnode **a_vpp; 225 struct componentname *a_cnp; 226 } */ *ap; 227 { 228 229 *ap->a_vpp = NULL; 230 return (ENOTDIR); 231 } 232 233 /* 234 * vop_norename: 235 * 236 * Handle unlock and reference counting for arguments of vop_rename 237 * for filesystems that do not implement rename operation. 238 */ 239 static int 240 vop_norename(struct vop_rename_args *ap) 241 { 242 243 vop_rename_fail(ap); 244 return (EOPNOTSUPP); 245 } 246 247 /* 248 * vop_nostrategy: 249 * 250 * Strategy routine for VFS devices that have none. 251 * 252 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 253 * routine. Typically this is done for a BIO_READ strategy call. 254 * Typically B_INVAL is assumed to already be clear prior to a write 255 * and should not be cleared manually unless you just made the buffer 256 * invalid. BIO_ERROR should be cleared either way. 257 */ 258 259 static int 260 vop_nostrategy (struct vop_strategy_args *ap) 261 { 262 printf("No strategy for buffer at %p\n", ap->a_bp); 263 vn_printf(ap->a_vp, "vnode "); 264 ap->a_bp->b_ioflags |= BIO_ERROR; 265 ap->a_bp->b_error = EOPNOTSUPP; 266 bufdone(ap->a_bp); 267 return (EOPNOTSUPP); 268 } 269 270 static int 271 get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf, 272 int dirbuflen, off_t *off, char **cpos, int *len, 273 int *eofflag, struct thread *td) 274 { 275 int error, reclen; 276 struct uio uio; 277 struct iovec iov; 278 struct dirent *dp; 279 280 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 281 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 282 283 if (*len == 0) { 284 iov.iov_base = dirbuf; 285 iov.iov_len = dirbuflen; 286 287 uio.uio_iov = &iov; 288 uio.uio_iovcnt = 1; 289 uio.uio_offset = *off; 290 uio.uio_resid = dirbuflen; 291 uio.uio_segflg = UIO_SYSSPACE; 292 uio.uio_rw = UIO_READ; 293 uio.uio_td = td; 294 295 *eofflag = 0; 296 297 #ifdef MAC 298 error = mac_vnode_check_readdir(td->td_ucred, vp); 299 if (error == 0) 300 #endif 301 error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag, 302 NULL, NULL); 303 if (error) 304 return (error); 305 306 *off = uio.uio_offset; 307 308 *cpos = dirbuf; 309 *len = (dirbuflen - uio.uio_resid); 310 311 if (*len == 0) 312 return (ENOENT); 313 } 314 315 dp = (struct dirent *)(*cpos); 316 reclen = dp->d_reclen; 317 *dpp = dp; 318 319 /* check for malformed directory.. */ 320 if (reclen < DIRENT_MINSIZE) 321 return (EINVAL); 322 323 *cpos += reclen; 324 *len -= reclen; 325 326 return (0); 327 } 328 329 /* 330 * Check if a named file exists in a given directory vnode. 331 */ 332 static int 333 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 334 { 335 char *dirbuf, *cpos; 336 int error, eofflag, dirbuflen, len, found; 337 off_t off; 338 struct dirent *dp; 339 struct vattr va; 340 341 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 342 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 343 344 found = 0; 345 346 error = VOP_GETATTR(vp, &va, td->td_ucred); 347 if (error) 348 return (found); 349 350 dirbuflen = DEV_BSIZE; 351 if (dirbuflen < va.va_blocksize) 352 dirbuflen = va.va_blocksize; 353 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 354 355 off = 0; 356 len = 0; 357 do { 358 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off, 359 &cpos, &len, &eofflag, td); 360 if (error) 361 goto out; 362 363 if (dp->d_type != DT_WHT && dp->d_fileno != 0 && 364 strcmp(dp->d_name, dirname) == 0) { 365 found = 1; 366 goto out; 367 } 368 } while (len > 0 || !eofflag); 369 370 out: 371 free(dirbuf, M_TEMP); 372 return (found); 373 } 374 375 int 376 vop_stdaccess(struct vop_access_args *ap) 377 { 378 379 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | 380 VAPPEND)) == 0, ("invalid bit in accmode")); 381 382 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td)); 383 } 384 385 int 386 vop_stdaccessx(struct vop_accessx_args *ap) 387 { 388 int error; 389 accmode_t accmode = ap->a_accmode; 390 391 error = vfs_unixify_accmode(&accmode); 392 if (error != 0) 393 return (error); 394 395 if (accmode == 0) 396 return (0); 397 398 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 399 } 400 401 /* 402 * Advisory record locking support 403 */ 404 int 405 vop_stdadvlock(struct vop_advlock_args *ap) 406 { 407 struct vnode *vp; 408 struct vattr vattr; 409 int error; 410 411 vp = ap->a_vp; 412 if (ap->a_fl->l_whence == SEEK_END) { 413 /* 414 * The NFSv4 server must avoid doing a vn_lock() here, since it 415 * can deadlock the nfsd threads, due to a LOR. Fortunately 416 * the NFSv4 server always uses SEEK_SET and this code is 417 * only required for the SEEK_END case. 418 */ 419 vn_lock(vp, LK_SHARED | LK_RETRY); 420 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 421 VOP_UNLOCK(vp, 0); 422 if (error) 423 return (error); 424 } else 425 vattr.va_size = 0; 426 427 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size)); 428 } 429 430 int 431 vop_stdadvlockasync(struct vop_advlockasync_args *ap) 432 { 433 struct vnode *vp; 434 struct vattr vattr; 435 int error; 436 437 vp = ap->a_vp; 438 if (ap->a_fl->l_whence == SEEK_END) { 439 /* The size argument is only needed for SEEK_END. */ 440 vn_lock(vp, LK_SHARED | LK_RETRY); 441 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 442 VOP_UNLOCK(vp, 0); 443 if (error) 444 return (error); 445 } else 446 vattr.va_size = 0; 447 448 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 449 } 450 451 int 452 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap) 453 { 454 struct vnode *vp; 455 456 vp = ap->a_vp; 457 lf_purgelocks(vp, &vp->v_lockf); 458 return (0); 459 } 460 461 /* 462 * vop_stdpathconf: 463 * 464 * Standard implementation of POSIX pathconf, to get information about limits 465 * for a filesystem. 466 * Override per filesystem for the case where the filesystem has smaller 467 * limits. 468 */ 469 int 470 vop_stdpathconf(ap) 471 struct vop_pathconf_args /* { 472 struct vnode *a_vp; 473 int a_name; 474 int *a_retval; 475 } */ *ap; 476 { 477 478 switch (ap->a_name) { 479 case _PC_ASYNC_IO: 480 *ap->a_retval = _POSIX_ASYNCHRONOUS_IO; 481 return (0); 482 case _PC_PATH_MAX: 483 *ap->a_retval = PATH_MAX; 484 return (0); 485 case _PC_ACL_EXTENDED: 486 case _PC_ACL_NFS4: 487 case _PC_CAP_PRESENT: 488 case _PC_INF_PRESENT: 489 case _PC_MAC_PRESENT: 490 *ap->a_retval = 0; 491 return (0); 492 default: 493 return (EINVAL); 494 } 495 /* NOTREACHED */ 496 } 497 498 /* 499 * Standard lock, unlock and islocked functions. 500 */ 501 int 502 vop_stdlock(ap) 503 struct vop_lock1_args /* { 504 struct vnode *a_vp; 505 int a_flags; 506 char *file; 507 int line; 508 } */ *ap; 509 { 510 struct vnode *vp = ap->a_vp; 511 struct mtx *ilk; 512 513 ilk = VI_MTX(vp); 514 return (lockmgr_lock_fast_path(vp->v_vnlock, ap->a_flags, 515 &ilk->lock_object, ap->a_file, ap->a_line)); 516 } 517 518 /* See above. */ 519 int 520 vop_stdunlock(ap) 521 struct vop_unlock_args /* { 522 struct vnode *a_vp; 523 int a_flags; 524 } */ *ap; 525 { 526 struct vnode *vp = ap->a_vp; 527 struct mtx *ilk; 528 529 ilk = VI_MTX(vp); 530 return (lockmgr_unlock_fast_path(vp->v_vnlock, ap->a_flags, 531 &ilk->lock_object)); 532 } 533 534 /* See above. */ 535 int 536 vop_stdislocked(ap) 537 struct vop_islocked_args /* { 538 struct vnode *a_vp; 539 } */ *ap; 540 { 541 542 return (lockstatus(ap->a_vp->v_vnlock)); 543 } 544 545 /* 546 * Return true for select/poll. 547 */ 548 int 549 vop_nopoll(ap) 550 struct vop_poll_args /* { 551 struct vnode *a_vp; 552 int a_events; 553 struct ucred *a_cred; 554 struct thread *a_td; 555 } */ *ap; 556 { 557 558 return (poll_no_poll(ap->a_events)); 559 } 560 561 /* 562 * Implement poll for local filesystems that support it. 563 */ 564 int 565 vop_stdpoll(ap) 566 struct vop_poll_args /* { 567 struct vnode *a_vp; 568 int a_events; 569 struct ucred *a_cred; 570 struct thread *a_td; 571 } */ *ap; 572 { 573 if (ap->a_events & ~POLLSTANDARD) 574 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 575 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 576 } 577 578 /* 579 * Return our mount point, as we will take charge of the writes. 580 */ 581 int 582 vop_stdgetwritemount(ap) 583 struct vop_getwritemount_args /* { 584 struct vnode *a_vp; 585 struct mount **a_mpp; 586 } */ *ap; 587 { 588 struct mount *mp; 589 590 /* 591 * XXX Since this is called unlocked we may be recycled while 592 * attempting to ref the mount. If this is the case or mountpoint 593 * will be set to NULL. We only have to prevent this call from 594 * returning with a ref to an incorrect mountpoint. It is not 595 * harmful to return with a ref to our previous mountpoint. 596 */ 597 mp = ap->a_vp->v_mount; 598 if (mp != NULL) { 599 vfs_ref(mp); 600 if (mp != ap->a_vp->v_mount) { 601 vfs_rel(mp); 602 mp = NULL; 603 } 604 } 605 *(ap->a_mpp) = mp; 606 return (0); 607 } 608 609 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 610 int 611 vop_stdbmap(ap) 612 struct vop_bmap_args /* { 613 struct vnode *a_vp; 614 daddr_t a_bn; 615 struct bufobj **a_bop; 616 daddr_t *a_bnp; 617 int *a_runp; 618 int *a_runb; 619 } */ *ap; 620 { 621 622 if (ap->a_bop != NULL) 623 *ap->a_bop = &ap->a_vp->v_bufobj; 624 if (ap->a_bnp != NULL) 625 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 626 if (ap->a_runp != NULL) 627 *ap->a_runp = 0; 628 if (ap->a_runb != NULL) 629 *ap->a_runb = 0; 630 return (0); 631 } 632 633 int 634 vop_stdfsync(ap) 635 struct vop_fsync_args /* { 636 struct vnode *a_vp; 637 int a_waitfor; 638 struct thread *a_td; 639 } */ *ap; 640 { 641 642 return (vn_fsync_buf(ap->a_vp, ap->a_waitfor)); 643 } 644 645 static int 646 vop_stdfdatasync(struct vop_fdatasync_args *ap) 647 { 648 649 return (VOP_FSYNC(ap->a_vp, MNT_WAIT, ap->a_td)); 650 } 651 652 int 653 vop_stdfdatasync_buf(struct vop_fdatasync_args *ap) 654 { 655 656 return (vn_fsync_buf(ap->a_vp, MNT_WAIT)); 657 } 658 659 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 660 int 661 vop_stdgetpages(ap) 662 struct vop_getpages_args /* { 663 struct vnode *a_vp; 664 vm_page_t *a_m; 665 int a_count; 666 int *a_rbehind; 667 int *a_rahead; 668 } */ *ap; 669 { 670 671 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 672 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL); 673 } 674 675 static int 676 vop_stdgetpages_async(struct vop_getpages_async_args *ap) 677 { 678 int error; 679 680 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind, 681 ap->a_rahead); 682 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error); 683 return (error); 684 } 685 686 int 687 vop_stdkqfilter(struct vop_kqfilter_args *ap) 688 { 689 return vfs_kqfilter(ap); 690 } 691 692 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 693 int 694 vop_stdputpages(ap) 695 struct vop_putpages_args /* { 696 struct vnode *a_vp; 697 vm_page_t *a_m; 698 int a_count; 699 int a_sync; 700 int *a_rtvals; 701 } */ *ap; 702 { 703 704 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 705 ap->a_sync, ap->a_rtvals); 706 } 707 708 int 709 vop_stdvptofh(struct vop_vptofh_args *ap) 710 { 711 return (EOPNOTSUPP); 712 } 713 714 int 715 vop_stdvptocnp(struct vop_vptocnp_args *ap) 716 { 717 struct vnode *vp = ap->a_vp; 718 struct vnode **dvp = ap->a_vpp; 719 struct ucred *cred = ap->a_cred; 720 char *buf = ap->a_buf; 721 int *buflen = ap->a_buflen; 722 char *dirbuf, *cpos; 723 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 724 off_t off; 725 ino_t fileno; 726 struct vattr va; 727 struct nameidata nd; 728 struct thread *td; 729 struct dirent *dp; 730 struct vnode *mvp; 731 732 i = *buflen; 733 error = 0; 734 covered = 0; 735 td = curthread; 736 737 if (vp->v_type != VDIR) 738 return (ENOENT); 739 740 error = VOP_GETATTR(vp, &va, cred); 741 if (error) 742 return (error); 743 744 VREF(vp); 745 locked = VOP_ISLOCKED(vp); 746 VOP_UNLOCK(vp, 0); 747 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE, 748 "..", vp, td); 749 flags = FREAD; 750 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 751 if (error) { 752 vn_lock(vp, locked | LK_RETRY); 753 return (error); 754 } 755 NDFREE(&nd, NDF_ONLY_PNBUF); 756 757 mvp = *dvp = nd.ni_vp; 758 759 if (vp->v_mount != (*dvp)->v_mount && 760 ((*dvp)->v_vflag & VV_ROOT) && 761 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 762 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 763 VREF(mvp); 764 VOP_UNLOCK(mvp, 0); 765 vn_close(mvp, FREAD, cred, td); 766 VREF(*dvp); 767 vn_lock(*dvp, LK_SHARED | LK_RETRY); 768 covered = 1; 769 } 770 771 fileno = va.va_fileid; 772 773 dirbuflen = DEV_BSIZE; 774 if (dirbuflen < va.va_blocksize) 775 dirbuflen = va.va_blocksize; 776 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 777 778 if ((*dvp)->v_type != VDIR) { 779 error = ENOENT; 780 goto out; 781 } 782 783 off = 0; 784 len = 0; 785 do { 786 /* call VOP_READDIR of parent */ 787 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 788 &cpos, &len, &eofflag, td); 789 if (error) 790 goto out; 791 792 if ((dp->d_type != DT_WHT) && 793 (dp->d_fileno == fileno)) { 794 if (covered) { 795 VOP_UNLOCK(*dvp, 0); 796 vn_lock(mvp, LK_SHARED | LK_RETRY); 797 if (dirent_exists(mvp, dp->d_name, td)) { 798 error = ENOENT; 799 VOP_UNLOCK(mvp, 0); 800 vn_lock(*dvp, LK_SHARED | LK_RETRY); 801 goto out; 802 } 803 VOP_UNLOCK(mvp, 0); 804 vn_lock(*dvp, LK_SHARED | LK_RETRY); 805 } 806 i -= dp->d_namlen; 807 808 if (i < 0) { 809 error = ENOMEM; 810 goto out; 811 } 812 if (dp->d_namlen == 1 && dp->d_name[0] == '.') { 813 error = ENOENT; 814 } else { 815 bcopy(dp->d_name, buf + i, dp->d_namlen); 816 error = 0; 817 } 818 goto out; 819 } 820 } while (len > 0 || !eofflag); 821 error = ENOENT; 822 823 out: 824 free(dirbuf, M_TEMP); 825 if (!error) { 826 *buflen = i; 827 vref(*dvp); 828 } 829 if (covered) { 830 vput(*dvp); 831 vrele(mvp); 832 } else { 833 VOP_UNLOCK(mvp, 0); 834 vn_close(mvp, FREAD, cred, td); 835 } 836 vn_lock(vp, locked | LK_RETRY); 837 return (error); 838 } 839 840 int 841 vop_stdallocate(struct vop_allocate_args *ap) 842 { 843 #ifdef __notyet__ 844 struct statfs *sfs; 845 off_t maxfilesize = 0; 846 #endif 847 struct iovec aiov; 848 struct vattr vattr, *vap; 849 struct uio auio; 850 off_t fsize, len, cur, offset; 851 uint8_t *buf; 852 struct thread *td; 853 struct vnode *vp; 854 size_t iosize; 855 int error; 856 857 buf = NULL; 858 error = 0; 859 td = curthread; 860 vap = &vattr; 861 vp = ap->a_vp; 862 len = *ap->a_len; 863 offset = *ap->a_offset; 864 865 error = VOP_GETATTR(vp, vap, td->td_ucred); 866 if (error != 0) 867 goto out; 868 fsize = vap->va_size; 869 iosize = vap->va_blocksize; 870 if (iosize == 0) 871 iosize = BLKDEV_IOSIZE; 872 if (iosize > MAXPHYS) 873 iosize = MAXPHYS; 874 buf = malloc(iosize, M_TEMP, M_WAITOK); 875 876 #ifdef __notyet__ 877 /* 878 * Check if the filesystem sets f_maxfilesize; if not use 879 * VOP_SETATTR to perform the check. 880 */ 881 sfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 882 error = VFS_STATFS(vp->v_mount, sfs, td); 883 if (error == 0) 884 maxfilesize = sfs->f_maxfilesize; 885 free(sfs, M_STATFS); 886 if (error != 0) 887 goto out; 888 if (maxfilesize) { 889 if (offset > maxfilesize || len > maxfilesize || 890 offset + len > maxfilesize) { 891 error = EFBIG; 892 goto out; 893 } 894 } else 895 #endif 896 if (offset + len > vap->va_size) { 897 /* 898 * Test offset + len against the filesystem's maxfilesize. 899 */ 900 VATTR_NULL(vap); 901 vap->va_size = offset + len; 902 error = VOP_SETATTR(vp, vap, td->td_ucred); 903 if (error != 0) 904 goto out; 905 VATTR_NULL(vap); 906 vap->va_size = fsize; 907 error = VOP_SETATTR(vp, vap, td->td_ucred); 908 if (error != 0) 909 goto out; 910 } 911 912 for (;;) { 913 /* 914 * Read and write back anything below the nominal file 915 * size. There's currently no way outside the filesystem 916 * to know whether this area is sparse or not. 917 */ 918 cur = iosize; 919 if ((offset % iosize) != 0) 920 cur -= (offset % iosize); 921 if (cur > len) 922 cur = len; 923 if (offset < fsize) { 924 aiov.iov_base = buf; 925 aiov.iov_len = cur; 926 auio.uio_iov = &aiov; 927 auio.uio_iovcnt = 1; 928 auio.uio_offset = offset; 929 auio.uio_resid = cur; 930 auio.uio_segflg = UIO_SYSSPACE; 931 auio.uio_rw = UIO_READ; 932 auio.uio_td = td; 933 error = VOP_READ(vp, &auio, 0, td->td_ucred); 934 if (error != 0) 935 break; 936 if (auio.uio_resid > 0) { 937 bzero(buf + cur - auio.uio_resid, 938 auio.uio_resid); 939 } 940 } else { 941 bzero(buf, cur); 942 } 943 944 aiov.iov_base = buf; 945 aiov.iov_len = cur; 946 auio.uio_iov = &aiov; 947 auio.uio_iovcnt = 1; 948 auio.uio_offset = offset; 949 auio.uio_resid = cur; 950 auio.uio_segflg = UIO_SYSSPACE; 951 auio.uio_rw = UIO_WRITE; 952 auio.uio_td = td; 953 954 error = VOP_WRITE(vp, &auio, 0, td->td_ucred); 955 if (error != 0) 956 break; 957 958 len -= cur; 959 offset += cur; 960 if (len == 0) 961 break; 962 if (should_yield()) 963 break; 964 } 965 966 out: 967 *ap->a_len = len; 968 *ap->a_offset = offset; 969 free(buf, M_TEMP); 970 return (error); 971 } 972 973 int 974 vop_stdadvise(struct vop_advise_args *ap) 975 { 976 struct vnode *vp; 977 struct bufobj *bo; 978 daddr_t startn, endn; 979 off_t bstart, bend, start, end; 980 int bsize, error; 981 982 vp = ap->a_vp; 983 switch (ap->a_advice) { 984 case POSIX_FADV_WILLNEED: 985 /* 986 * Do nothing for now. Filesystems should provide a 987 * custom method which starts an asynchronous read of 988 * the requested region. 989 */ 990 error = 0; 991 break; 992 case POSIX_FADV_DONTNEED: 993 error = 0; 994 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 995 if (vp->v_iflag & VI_DOOMED) { 996 VOP_UNLOCK(vp, 0); 997 break; 998 } 999 1000 /* 1001 * Round to block boundaries (and later possibly further to 1002 * page boundaries). Applications cannot reasonably be aware 1003 * of the boundaries, and the rounding must be to expand at 1004 * both extremities to cover enough. It still doesn't cover 1005 * read-ahead. For partial blocks, this gives unnecessary 1006 * discarding of buffers but is efficient enough since the 1007 * pages usually remain in VMIO for some time. 1008 */ 1009 bsize = vp->v_bufobj.bo_bsize; 1010 bstart = rounddown(ap->a_start, bsize); 1011 bend = roundup(ap->a_end, bsize); 1012 1013 /* 1014 * Deactivate pages in the specified range from the backing VM 1015 * object. Pages that are resident in the buffer cache will 1016 * remain wired until their corresponding buffers are released 1017 * below. 1018 */ 1019 if (vp->v_object != NULL) { 1020 start = trunc_page(bstart); 1021 end = round_page(bend); 1022 VM_OBJECT_RLOCK(vp->v_object); 1023 vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start), 1024 OFF_TO_IDX(end)); 1025 VM_OBJECT_RUNLOCK(vp->v_object); 1026 } 1027 1028 bo = &vp->v_bufobj; 1029 BO_RLOCK(bo); 1030 startn = bstart / bsize; 1031 endn = bend / bsize; 1032 error = bnoreuselist(&bo->bo_clean, bo, startn, endn); 1033 if (error == 0) 1034 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn); 1035 BO_RUNLOCK(bo); 1036 VOP_UNLOCK(vp, 0); 1037 break; 1038 default: 1039 error = EINVAL; 1040 break; 1041 } 1042 return (error); 1043 } 1044 1045 int 1046 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1047 { 1048 1049 ap->a_vp->v_unpcb = ap->a_unpcb; 1050 return (0); 1051 } 1052 1053 int 1054 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1055 { 1056 1057 *ap->a_unpcb = ap->a_vp->v_unpcb; 1058 return (0); 1059 } 1060 1061 int 1062 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1063 { 1064 1065 ap->a_vp->v_unpcb = NULL; 1066 return (0); 1067 } 1068 1069 static int 1070 vop_stdis_text(struct vop_is_text_args *ap) 1071 { 1072 1073 return ((ap->a_vp->v_vflag & VV_TEXT) != 0); 1074 } 1075 1076 static int 1077 vop_stdset_text(struct vop_set_text_args *ap) 1078 { 1079 1080 ap->a_vp->v_vflag |= VV_TEXT; 1081 return (0); 1082 } 1083 1084 static int 1085 vop_stdunset_text(struct vop_unset_text_args *ap) 1086 { 1087 1088 ap->a_vp->v_vflag &= ~VV_TEXT; 1089 return (0); 1090 } 1091 1092 static int 1093 vop_stdget_writecount(struct vop_get_writecount_args *ap) 1094 { 1095 1096 *ap->a_writecount = ap->a_vp->v_writecount; 1097 return (0); 1098 } 1099 1100 static int 1101 vop_stdadd_writecount(struct vop_add_writecount_args *ap) 1102 { 1103 1104 ap->a_vp->v_writecount += ap->a_inc; 1105 return (0); 1106 } 1107 1108 /* 1109 * vfs default ops 1110 * used to fill the vfs function table to get reasonable default return values. 1111 */ 1112 int 1113 vfs_stdroot (mp, flags, vpp) 1114 struct mount *mp; 1115 int flags; 1116 struct vnode **vpp; 1117 { 1118 1119 return (EOPNOTSUPP); 1120 } 1121 1122 int 1123 vfs_stdstatfs (mp, sbp) 1124 struct mount *mp; 1125 struct statfs *sbp; 1126 { 1127 1128 return (EOPNOTSUPP); 1129 } 1130 1131 int 1132 vfs_stdquotactl (mp, cmds, uid, arg) 1133 struct mount *mp; 1134 int cmds; 1135 uid_t uid; 1136 void *arg; 1137 { 1138 1139 return (EOPNOTSUPP); 1140 } 1141 1142 int 1143 vfs_stdsync(mp, waitfor) 1144 struct mount *mp; 1145 int waitfor; 1146 { 1147 struct vnode *vp, *mvp; 1148 struct thread *td; 1149 int error, lockreq, allerror = 0; 1150 1151 td = curthread; 1152 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1153 if (waitfor != MNT_WAIT) 1154 lockreq |= LK_NOWAIT; 1155 /* 1156 * Force stale buffer cache information to be flushed. 1157 */ 1158 loop: 1159 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1160 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1161 VI_UNLOCK(vp); 1162 continue; 1163 } 1164 if ((error = vget(vp, lockreq, td)) != 0) { 1165 if (error == ENOENT) { 1166 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1167 goto loop; 1168 } 1169 continue; 1170 } 1171 error = VOP_FSYNC(vp, waitfor, td); 1172 if (error) 1173 allerror = error; 1174 vput(vp); 1175 } 1176 return (allerror); 1177 } 1178 1179 int 1180 vfs_stdnosync (mp, waitfor) 1181 struct mount *mp; 1182 int waitfor; 1183 { 1184 1185 return (0); 1186 } 1187 1188 int 1189 vfs_stdvget (mp, ino, flags, vpp) 1190 struct mount *mp; 1191 ino_t ino; 1192 int flags; 1193 struct vnode **vpp; 1194 { 1195 1196 return (EOPNOTSUPP); 1197 } 1198 1199 int 1200 vfs_stdfhtovp (mp, fhp, flags, vpp) 1201 struct mount *mp; 1202 struct fid *fhp; 1203 int flags; 1204 struct vnode **vpp; 1205 { 1206 1207 return (EOPNOTSUPP); 1208 } 1209 1210 int 1211 vfs_stdinit (vfsp) 1212 struct vfsconf *vfsp; 1213 { 1214 1215 return (0); 1216 } 1217 1218 int 1219 vfs_stduninit (vfsp) 1220 struct vfsconf *vfsp; 1221 { 1222 1223 return(0); 1224 } 1225 1226 int 1227 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 1228 struct mount *mp; 1229 int cmd; 1230 struct vnode *filename_vp; 1231 int attrnamespace; 1232 const char *attrname; 1233 { 1234 1235 if (filename_vp != NULL) 1236 VOP_UNLOCK(filename_vp, 0); 1237 return (EOPNOTSUPP); 1238 } 1239 1240 int 1241 vfs_stdsysctl(mp, op, req) 1242 struct mount *mp; 1243 fsctlop_t op; 1244 struct sysctl_req *req; 1245 { 1246 1247 return (EOPNOTSUPP); 1248 } 1249 1250 static vop_bypass_t * 1251 bp_by_off(struct vop_vector *vop, struct vop_generic_args *a) 1252 { 1253 1254 return (*(vop_bypass_t **)((char *)vop + a->a_desc->vdesc_vop_offset)); 1255 } 1256 1257 int 1258 vop_sigdefer(struct vop_vector *vop, struct vop_generic_args *a) 1259 { 1260 vop_bypass_t *bp; 1261 int prev_stops, rc; 1262 1263 for (; vop != NULL; vop = vop->vop_default) { 1264 bp = bp_by_off(vop, a); 1265 if (bp != NULL) 1266 break; 1267 1268 /* 1269 * Bypass is not really supported. It is done for 1270 * fallback to unimplemented vops in the default 1271 * vector. 1272 */ 1273 bp = vop->vop_bypass; 1274 if (bp != NULL) 1275 break; 1276 } 1277 MPASS(bp != NULL); 1278 1279 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT); 1280 rc = bp(a); 1281 sigallowstop(prev_stops); 1282 return (rc); 1283 }
Cache object: 6878a4c365eaa40e2afa821295ef0319
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