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/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 struct vnode *vp; 642 struct buf *bp, *nbp; 643 struct bufobj *bo; 644 struct mount *mp; 645 int error, maxretry; 646 647 error = 0; 648 maxretry = 10000; /* large, arbitrarily chosen */ 649 vp = ap->a_vp; 650 mp = NULL; 651 if (vp->v_type == VCHR) { 652 VI_LOCK(vp); 653 mp = vp->v_rdev->si_mountpt; 654 VI_UNLOCK(vp); 655 } 656 bo = &vp->v_bufobj; 657 BO_LOCK(bo); 658 loop1: 659 /* 660 * MARK/SCAN initialization to avoid infinite loops. 661 */ 662 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 663 bp->b_vflags &= ~BV_SCANNED; 664 bp->b_error = 0; 665 } 666 667 /* 668 * Flush all dirty buffers associated with a vnode. 669 */ 670 loop2: 671 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 672 if ((bp->b_vflags & BV_SCANNED) != 0) 673 continue; 674 bp->b_vflags |= BV_SCANNED; 675 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 676 if (ap->a_waitfor != MNT_WAIT) 677 continue; 678 if (BUF_LOCK(bp, 679 LK_EXCLUSIVE | LK_INTERLOCK | LK_SLEEPFAIL, 680 BO_LOCKPTR(bo)) != 0) { 681 BO_LOCK(bo); 682 goto loop1; 683 } 684 BO_LOCK(bo); 685 } 686 BO_UNLOCK(bo); 687 KASSERT(bp->b_bufobj == bo, 688 ("bp %p wrong b_bufobj %p should be %p", 689 bp, bp->b_bufobj, bo)); 690 if ((bp->b_flags & B_DELWRI) == 0) 691 panic("fsync: not dirty"); 692 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 693 vfs_bio_awrite(bp); 694 } else { 695 bremfree(bp); 696 bawrite(bp); 697 } 698 if (maxretry < 1000) 699 pause("dirty", hz < 1000 ? 1 : hz / 1000); 700 BO_LOCK(bo); 701 goto loop2; 702 } 703 704 /* 705 * If synchronous the caller expects us to completely resolve all 706 * dirty buffers in the system. Wait for in-progress I/O to 707 * complete (which could include background bitmap writes), then 708 * retry if dirty blocks still exist. 709 */ 710 if (ap->a_waitfor == MNT_WAIT) { 711 bufobj_wwait(bo, 0, 0); 712 if (bo->bo_dirty.bv_cnt > 0) { 713 /* 714 * If we are unable to write any of these buffers 715 * then we fail now rather than trying endlessly 716 * to write them out. 717 */ 718 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 719 if ((error = bp->b_error) != 0) 720 break; 721 if ((mp != NULL && mp->mnt_secondary_writes > 0) || 722 (error == 0 && --maxretry >= 0)) 723 goto loop1; 724 if (error == 0) 725 error = EAGAIN; 726 } 727 } 728 BO_UNLOCK(bo); 729 if (error != 0) 730 vn_printf(vp, "fsync: giving up on dirty (error = %d) ", error); 731 732 return (error); 733 } 734 735 static int 736 vop_stdfdatasync(struct vop_fdatasync_args *ap) 737 { 738 739 return (VOP_FSYNC(ap->a_vp, MNT_WAIT, ap->a_td)); 740 } 741 742 int 743 vop_stdfdatasync_buf(struct vop_fdatasync_args *ap) 744 { 745 struct vop_fsync_args apf; 746 747 apf.a_vp = ap->a_vp; 748 apf.a_waitfor = MNT_WAIT; 749 apf.a_td = ap->a_td; 750 return (vop_stdfsync(&apf)); 751 } 752 753 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 754 int 755 vop_stdgetpages(ap) 756 struct vop_getpages_args /* { 757 struct vnode *a_vp; 758 vm_page_t *a_m; 759 int a_count; 760 int *a_rbehind; 761 int *a_rahead; 762 } */ *ap; 763 { 764 765 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 766 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL); 767 } 768 769 static int 770 vop_stdgetpages_async(struct vop_getpages_async_args *ap) 771 { 772 int error; 773 774 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind, 775 ap->a_rahead); 776 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error); 777 return (error); 778 } 779 780 int 781 vop_stdkqfilter(struct vop_kqfilter_args *ap) 782 { 783 return vfs_kqfilter(ap); 784 } 785 786 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 787 int 788 vop_stdputpages(ap) 789 struct vop_putpages_args /* { 790 struct vnode *a_vp; 791 vm_page_t *a_m; 792 int a_count; 793 int a_sync; 794 int *a_rtvals; 795 } */ *ap; 796 { 797 798 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 799 ap->a_sync, ap->a_rtvals); 800 } 801 802 int 803 vop_stdvptofh(struct vop_vptofh_args *ap) 804 { 805 return (EOPNOTSUPP); 806 } 807 808 int 809 vop_stdvptocnp(struct vop_vptocnp_args *ap) 810 { 811 struct vnode *vp = ap->a_vp; 812 struct vnode **dvp = ap->a_vpp; 813 struct ucred *cred = ap->a_cred; 814 char *buf = ap->a_buf; 815 int *buflen = ap->a_buflen; 816 char *dirbuf, *cpos; 817 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 818 off_t off; 819 ino_t fileno; 820 struct vattr va; 821 struct nameidata nd; 822 struct thread *td; 823 struct dirent *dp; 824 struct vnode *mvp; 825 826 i = *buflen; 827 error = 0; 828 covered = 0; 829 td = curthread; 830 831 if (vp->v_type != VDIR) 832 return (ENOENT); 833 834 error = VOP_GETATTR(vp, &va, cred); 835 if (error) 836 return (error); 837 838 VREF(vp); 839 locked = VOP_ISLOCKED(vp); 840 VOP_UNLOCK(vp, 0); 841 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE, 842 "..", vp, td); 843 flags = FREAD; 844 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 845 if (error) { 846 vn_lock(vp, locked | LK_RETRY); 847 return (error); 848 } 849 NDFREE(&nd, NDF_ONLY_PNBUF); 850 851 mvp = *dvp = nd.ni_vp; 852 853 if (vp->v_mount != (*dvp)->v_mount && 854 ((*dvp)->v_vflag & VV_ROOT) && 855 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 856 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 857 VREF(mvp); 858 VOP_UNLOCK(mvp, 0); 859 vn_close(mvp, FREAD, cred, td); 860 VREF(*dvp); 861 vn_lock(*dvp, LK_SHARED | LK_RETRY); 862 covered = 1; 863 } 864 865 fileno = va.va_fileid; 866 867 dirbuflen = DEV_BSIZE; 868 if (dirbuflen < va.va_blocksize) 869 dirbuflen = va.va_blocksize; 870 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 871 872 if ((*dvp)->v_type != VDIR) { 873 error = ENOENT; 874 goto out; 875 } 876 877 off = 0; 878 len = 0; 879 do { 880 /* call VOP_READDIR of parent */ 881 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 882 &cpos, &len, &eofflag, td); 883 if (error) 884 goto out; 885 886 if ((dp->d_type != DT_WHT) && 887 (dp->d_fileno == fileno)) { 888 if (covered) { 889 VOP_UNLOCK(*dvp, 0); 890 vn_lock(mvp, LK_SHARED | LK_RETRY); 891 if (dirent_exists(mvp, dp->d_name, td)) { 892 error = ENOENT; 893 VOP_UNLOCK(mvp, 0); 894 vn_lock(*dvp, LK_SHARED | LK_RETRY); 895 goto out; 896 } 897 VOP_UNLOCK(mvp, 0); 898 vn_lock(*dvp, LK_SHARED | LK_RETRY); 899 } 900 i -= dp->d_namlen; 901 902 if (i < 0) { 903 error = ENOMEM; 904 goto out; 905 } 906 if (dp->d_namlen == 1 && dp->d_name[0] == '.') { 907 error = ENOENT; 908 } else { 909 bcopy(dp->d_name, buf + i, dp->d_namlen); 910 error = 0; 911 } 912 goto out; 913 } 914 } while (len > 0 || !eofflag); 915 error = ENOENT; 916 917 out: 918 free(dirbuf, M_TEMP); 919 if (!error) { 920 *buflen = i; 921 vref(*dvp); 922 } 923 if (covered) { 924 vput(*dvp); 925 vrele(mvp); 926 } else { 927 VOP_UNLOCK(mvp, 0); 928 vn_close(mvp, FREAD, cred, td); 929 } 930 vn_lock(vp, locked | LK_RETRY); 931 return (error); 932 } 933 934 int 935 vop_stdallocate(struct vop_allocate_args *ap) 936 { 937 #ifdef __notyet__ 938 struct statfs *sfs; 939 off_t maxfilesize = 0; 940 #endif 941 struct iovec aiov; 942 struct vattr vattr, *vap; 943 struct uio auio; 944 off_t fsize, len, cur, offset; 945 uint8_t *buf; 946 struct thread *td; 947 struct vnode *vp; 948 size_t iosize; 949 int error; 950 951 buf = NULL; 952 error = 0; 953 td = curthread; 954 vap = &vattr; 955 vp = ap->a_vp; 956 len = *ap->a_len; 957 offset = *ap->a_offset; 958 959 error = VOP_GETATTR(vp, vap, td->td_ucred); 960 if (error != 0) 961 goto out; 962 fsize = vap->va_size; 963 iosize = vap->va_blocksize; 964 if (iosize == 0) 965 iosize = BLKDEV_IOSIZE; 966 if (iosize > MAXPHYS) 967 iosize = MAXPHYS; 968 buf = malloc(iosize, M_TEMP, M_WAITOK); 969 970 #ifdef __notyet__ 971 /* 972 * Check if the filesystem sets f_maxfilesize; if not use 973 * VOP_SETATTR to perform the check. 974 */ 975 sfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 976 error = VFS_STATFS(vp->v_mount, sfs, td); 977 if (error == 0) 978 maxfilesize = sfs->f_maxfilesize; 979 free(sfs, M_STATFS); 980 if (error != 0) 981 goto out; 982 if (maxfilesize) { 983 if (offset > maxfilesize || len > maxfilesize || 984 offset + len > maxfilesize) { 985 error = EFBIG; 986 goto out; 987 } 988 } else 989 #endif 990 if (offset + len > vap->va_size) { 991 /* 992 * Test offset + len against the filesystem's maxfilesize. 993 */ 994 VATTR_NULL(vap); 995 vap->va_size = offset + len; 996 error = VOP_SETATTR(vp, vap, td->td_ucred); 997 if (error != 0) 998 goto out; 999 VATTR_NULL(vap); 1000 vap->va_size = fsize; 1001 error = VOP_SETATTR(vp, vap, td->td_ucred); 1002 if (error != 0) 1003 goto out; 1004 } 1005 1006 for (;;) { 1007 /* 1008 * Read and write back anything below the nominal file 1009 * size. There's currently no way outside the filesystem 1010 * to know whether this area is sparse or not. 1011 */ 1012 cur = iosize; 1013 if ((offset % iosize) != 0) 1014 cur -= (offset % iosize); 1015 if (cur > len) 1016 cur = len; 1017 if (offset < fsize) { 1018 aiov.iov_base = buf; 1019 aiov.iov_len = cur; 1020 auio.uio_iov = &aiov; 1021 auio.uio_iovcnt = 1; 1022 auio.uio_offset = offset; 1023 auio.uio_resid = cur; 1024 auio.uio_segflg = UIO_SYSSPACE; 1025 auio.uio_rw = UIO_READ; 1026 auio.uio_td = td; 1027 error = VOP_READ(vp, &auio, 0, td->td_ucred); 1028 if (error != 0) 1029 break; 1030 if (auio.uio_resid > 0) { 1031 bzero(buf + cur - auio.uio_resid, 1032 auio.uio_resid); 1033 } 1034 } else { 1035 bzero(buf, cur); 1036 } 1037 1038 aiov.iov_base = buf; 1039 aiov.iov_len = cur; 1040 auio.uio_iov = &aiov; 1041 auio.uio_iovcnt = 1; 1042 auio.uio_offset = offset; 1043 auio.uio_resid = cur; 1044 auio.uio_segflg = UIO_SYSSPACE; 1045 auio.uio_rw = UIO_WRITE; 1046 auio.uio_td = td; 1047 1048 error = VOP_WRITE(vp, &auio, 0, td->td_ucred); 1049 if (error != 0) 1050 break; 1051 1052 len -= cur; 1053 offset += cur; 1054 if (len == 0) 1055 break; 1056 if (should_yield()) 1057 break; 1058 } 1059 1060 out: 1061 *ap->a_len = len; 1062 *ap->a_offset = offset; 1063 free(buf, M_TEMP); 1064 return (error); 1065 } 1066 1067 int 1068 vop_stdadvise(struct vop_advise_args *ap) 1069 { 1070 struct vnode *vp; 1071 struct bufobj *bo; 1072 daddr_t startn, endn; 1073 off_t bstart, bend, start, end; 1074 int bsize, error; 1075 1076 vp = ap->a_vp; 1077 switch (ap->a_advice) { 1078 case POSIX_FADV_WILLNEED: 1079 /* 1080 * Do nothing for now. Filesystems should provide a 1081 * custom method which starts an asynchronous read of 1082 * the requested region. 1083 */ 1084 error = 0; 1085 break; 1086 case POSIX_FADV_DONTNEED: 1087 error = 0; 1088 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1089 if (vp->v_iflag & VI_DOOMED) { 1090 VOP_UNLOCK(vp, 0); 1091 break; 1092 } 1093 1094 /* 1095 * Round to block boundaries (and later possibly further to 1096 * page boundaries). Applications cannot reasonably be aware 1097 * of the boundaries, and the rounding must be to expand at 1098 * both extremities to cover enough. It still doesn't cover 1099 * read-ahead. For partial blocks, this gives unnecessary 1100 * discarding of buffers but is efficient enough since the 1101 * pages usually remain in VMIO for some time. 1102 */ 1103 bsize = vp->v_bufobj.bo_bsize; 1104 bstart = rounddown(ap->a_start, bsize); 1105 bend = roundup(ap->a_end, bsize); 1106 1107 /* 1108 * Deactivate pages in the specified range from the backing VM 1109 * object. Pages that are resident in the buffer cache will 1110 * remain wired until their corresponding buffers are released 1111 * below. 1112 */ 1113 if (vp->v_object != NULL) { 1114 start = trunc_page(bstart); 1115 end = round_page(bend); 1116 VM_OBJECT_RLOCK(vp->v_object); 1117 vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start), 1118 OFF_TO_IDX(end)); 1119 VM_OBJECT_RUNLOCK(vp->v_object); 1120 } 1121 1122 bo = &vp->v_bufobj; 1123 BO_RLOCK(bo); 1124 startn = bstart / bsize; 1125 endn = bend / bsize; 1126 error = bnoreuselist(&bo->bo_clean, bo, startn, endn); 1127 if (error == 0) 1128 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn); 1129 BO_RUNLOCK(bo); 1130 VOP_UNLOCK(vp, 0); 1131 break; 1132 default: 1133 error = EINVAL; 1134 break; 1135 } 1136 return (error); 1137 } 1138 1139 int 1140 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1141 { 1142 1143 ap->a_vp->v_unpcb = ap->a_unpcb; 1144 return (0); 1145 } 1146 1147 int 1148 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1149 { 1150 1151 *ap->a_unpcb = ap->a_vp->v_unpcb; 1152 return (0); 1153 } 1154 1155 int 1156 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1157 { 1158 1159 ap->a_vp->v_unpcb = NULL; 1160 return (0); 1161 } 1162 1163 static int 1164 vop_stdis_text(struct vop_is_text_args *ap) 1165 { 1166 1167 return ((ap->a_vp->v_vflag & VV_TEXT) != 0); 1168 } 1169 1170 static int 1171 vop_stdset_text(struct vop_set_text_args *ap) 1172 { 1173 1174 ap->a_vp->v_vflag |= VV_TEXT; 1175 return (0); 1176 } 1177 1178 static int 1179 vop_stdunset_text(struct vop_unset_text_args *ap) 1180 { 1181 1182 ap->a_vp->v_vflag &= ~VV_TEXT; 1183 return (0); 1184 } 1185 1186 static int 1187 vop_stdget_writecount(struct vop_get_writecount_args *ap) 1188 { 1189 1190 *ap->a_writecount = ap->a_vp->v_writecount; 1191 return (0); 1192 } 1193 1194 static int 1195 vop_stdadd_writecount(struct vop_add_writecount_args *ap) 1196 { 1197 1198 ap->a_vp->v_writecount += ap->a_inc; 1199 return (0); 1200 } 1201 1202 /* 1203 * vfs default ops 1204 * used to fill the vfs function table to get reasonable default return values. 1205 */ 1206 int 1207 vfs_stdroot (mp, flags, vpp) 1208 struct mount *mp; 1209 int flags; 1210 struct vnode **vpp; 1211 { 1212 1213 return (EOPNOTSUPP); 1214 } 1215 1216 int 1217 vfs_stdstatfs (mp, sbp) 1218 struct mount *mp; 1219 struct statfs *sbp; 1220 { 1221 1222 return (EOPNOTSUPP); 1223 } 1224 1225 int 1226 vfs_stdquotactl (mp, cmds, uid, arg) 1227 struct mount *mp; 1228 int cmds; 1229 uid_t uid; 1230 void *arg; 1231 { 1232 1233 return (EOPNOTSUPP); 1234 } 1235 1236 int 1237 vfs_stdsync(mp, waitfor) 1238 struct mount *mp; 1239 int waitfor; 1240 { 1241 struct vnode *vp, *mvp; 1242 struct thread *td; 1243 int error, lockreq, allerror = 0; 1244 1245 td = curthread; 1246 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1247 if (waitfor != MNT_WAIT) 1248 lockreq |= LK_NOWAIT; 1249 /* 1250 * Force stale buffer cache information to be flushed. 1251 */ 1252 loop: 1253 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1254 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1255 VI_UNLOCK(vp); 1256 continue; 1257 } 1258 if ((error = vget(vp, lockreq, td)) != 0) { 1259 if (error == ENOENT) { 1260 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1261 goto loop; 1262 } 1263 continue; 1264 } 1265 error = VOP_FSYNC(vp, waitfor, td); 1266 if (error) 1267 allerror = error; 1268 vput(vp); 1269 } 1270 return (allerror); 1271 } 1272 1273 int 1274 vfs_stdnosync (mp, waitfor) 1275 struct mount *mp; 1276 int waitfor; 1277 { 1278 1279 return (0); 1280 } 1281 1282 int 1283 vfs_stdvget (mp, ino, flags, vpp) 1284 struct mount *mp; 1285 ino_t ino; 1286 int flags; 1287 struct vnode **vpp; 1288 { 1289 1290 return (EOPNOTSUPP); 1291 } 1292 1293 int 1294 vfs_stdfhtovp (mp, fhp, flags, vpp) 1295 struct mount *mp; 1296 struct fid *fhp; 1297 int flags; 1298 struct vnode **vpp; 1299 { 1300 1301 return (EOPNOTSUPP); 1302 } 1303 1304 int 1305 vfs_stdinit (vfsp) 1306 struct vfsconf *vfsp; 1307 { 1308 1309 return (0); 1310 } 1311 1312 int 1313 vfs_stduninit (vfsp) 1314 struct vfsconf *vfsp; 1315 { 1316 1317 return(0); 1318 } 1319 1320 int 1321 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 1322 struct mount *mp; 1323 int cmd; 1324 struct vnode *filename_vp; 1325 int attrnamespace; 1326 const char *attrname; 1327 { 1328 1329 if (filename_vp != NULL) 1330 VOP_UNLOCK(filename_vp, 0); 1331 return (EOPNOTSUPP); 1332 } 1333 1334 int 1335 vfs_stdsysctl(mp, op, req) 1336 struct mount *mp; 1337 fsctlop_t op; 1338 struct sysctl_req *req; 1339 { 1340 1341 return (EOPNOTSUPP); 1342 } 1343 1344 static vop_bypass_t * 1345 bp_by_off(struct vop_vector *vop, struct vop_generic_args *a) 1346 { 1347 1348 return (*(vop_bypass_t **)((char *)vop + a->a_desc->vdesc_vop_offset)); 1349 } 1350 1351 int 1352 vop_sigdefer(struct vop_vector *vop, struct vop_generic_args *a) 1353 { 1354 vop_bypass_t *bp; 1355 int prev_stops, rc; 1356 1357 for (; vop != NULL; vop = vop->vop_default) { 1358 bp = bp_by_off(vop, a); 1359 if (bp != NULL) 1360 break; 1361 1362 /* 1363 * Bypass is not really supported. It is done for 1364 * fallback to unimplemented vops in the default 1365 * vector. 1366 */ 1367 bp = vop->vop_bypass; 1368 if (bp != NULL) 1369 break; 1370 } 1371 MPASS(bp != NULL); 1372 1373 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT); 1374 rc = bp(a); 1375 sigallowstop(prev_stops); 1376 return (rc); 1377 } 1378