1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed 6 * to Berkeley by John Heidemann of the UCLA Ficus project. 7 * 8 * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/bio.h> 41 #include <sys/buf.h> 42 #include <sys/conf.h> 43 #include <sys/event.h> 44 #include <sys/kernel.h> 45 #include <sys/limits.h> 46 #include <sys/lock.h> 47 #include <sys/lockf.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/namei.h> 51 #include <sys/rwlock.h> 52 #include <sys/fcntl.h> 53 #include <sys/unistd.h> 54 #include <sys/vnode.h> 55 #include <sys/dirent.h> 56 #include <sys/poll.h> 57 58 #include <security/mac/mac_framework.h> 59 60 #include <vm/vm.h> 61 #include <vm/vm_object.h> 62 #include <vm/vm_extern.h> 63 #include <vm/pmap.h> 64 #include <vm/vm_map.h> 65 #include <vm/vm_page.h> 66 #include <vm/vm_pager.h> 67 #include <vm/vnode_pager.h> 68 69 static int vop_nolookup(struct vop_lookup_args *); 70 static int vop_norename(struct vop_rename_args *); 71 static int vop_nostrategy(struct vop_strategy_args *); 72 static int get_next_dirent(struct vnode *vp, struct dirent **dpp, 73 char *dirbuf, int dirbuflen, off_t *off, 74 char **cpos, int *len, int *eofflag, 75 struct thread *td); 76 static int dirent_exists(struct vnode *vp, const char *dirname, 77 struct thread *td); 78 79 #define DIRENT_MINSIZE (sizeof(struct dirent) - (MAXNAMLEN+1) + 4) 80 81 static int vop_stdis_text(struct vop_is_text_args *ap); 82 static int vop_stdset_text(struct vop_set_text_args *ap); 83 static int vop_stdunset_text(struct vop_unset_text_args *ap); 84 static int vop_stdget_writecount(struct vop_get_writecount_args *ap); 85 static int vop_stdadd_writecount(struct vop_add_writecount_args *ap); 86 static int vop_stdgetpages_async(struct vop_getpages_async_args *ap); 87 88 /* 89 * This vnode table stores what we want to do if the filesystem doesn't 90 * implement a particular VOP. 91 * 92 * If there is no specific entry here, we will return EOPNOTSUPP. 93 * 94 * Note that every filesystem has to implement either vop_access 95 * or vop_accessx; failing to do so will result in immediate crash 96 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(), 97 * which calls vop_stdaccess() etc. 98 */ 99 100 struct vop_vector default_vnodeops = { 101 .vop_default = NULL, 102 .vop_bypass = VOP_EOPNOTSUPP, 103 104 .vop_access = vop_stdaccess, 105 .vop_accessx = vop_stdaccessx, 106 .vop_advise = vop_stdadvise, 107 .vop_advlock = vop_stdadvlock, 108 .vop_advlockasync = vop_stdadvlockasync, 109 .vop_advlockpurge = vop_stdadvlockpurge, 110 .vop_allocate = vop_stdallocate, 111 .vop_bmap = vop_stdbmap, 112 .vop_close = VOP_NULL, 113 .vop_fsync = VOP_NULL, 114 .vop_getpages = vop_stdgetpages, 115 .vop_getpages_async = vop_stdgetpages_async, 116 .vop_getwritemount = vop_stdgetwritemount, 117 .vop_inactive = VOP_NULL, 118 .vop_ioctl = VOP_ENOTTY, 119 .vop_kqfilter = vop_stdkqfilter, 120 .vop_islocked = vop_stdislocked, 121 .vop_lock1 = vop_stdlock, 122 .vop_lookup = vop_nolookup, 123 .vop_open = VOP_NULL, 124 .vop_pathconf = VOP_EINVAL, 125 .vop_poll = vop_nopoll, 126 .vop_putpages = vop_stdputpages, 127 .vop_readlink = VOP_EINVAL, 128 .vop_rename = vop_norename, 129 .vop_revoke = VOP_PANIC, 130 .vop_strategy = vop_nostrategy, 131 .vop_unlock = vop_stdunlock, 132 .vop_vptocnp = vop_stdvptocnp, 133 .vop_vptofh = vop_stdvptofh, 134 .vop_unp_bind = vop_stdunp_bind, 135 .vop_unp_connect = vop_stdunp_connect, 136 .vop_unp_detach = vop_stdunp_detach, 137 .vop_is_text = vop_stdis_text, 138 .vop_set_text = vop_stdset_text, 139 .vop_unset_text = vop_stdunset_text, 140 .vop_get_writecount = vop_stdget_writecount, 141 .vop_add_writecount = vop_stdadd_writecount, 142 }; 143 144 /* 145 * Series of placeholder functions for various error returns for 146 * VOPs. 147 */ 148 149 int 150 vop_eopnotsupp(struct vop_generic_args *ap) 151 { 152 /* 153 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 154 */ 155 156 return (EOPNOTSUPP); 157 } 158 159 int 160 vop_ebadf(struct vop_generic_args *ap) 161 { 162 163 return (EBADF); 164 } 165 166 int 167 vop_enotty(struct vop_generic_args *ap) 168 { 169 170 return (ENOTTY); 171 } 172 173 int 174 vop_einval(struct vop_generic_args *ap) 175 { 176 177 return (EINVAL); 178 } 179 180 int 181 vop_enoent(struct vop_generic_args *ap) 182 { 183 184 return (ENOENT); 185 } 186 187 int 188 vop_null(struct vop_generic_args *ap) 189 { 190 191 return (0); 192 } 193 194 /* 195 * Helper function to panic on some bad VOPs in some filesystems. 196 */ 197 int 198 vop_panic(struct vop_generic_args *ap) 199 { 200 201 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 202 } 203 204 /* 205 * vop_std<something> and vop_no<something> are default functions for use by 206 * filesystems that need the "default reasonable" implementation for a 207 * particular operation. 208 * 209 * The documentation for the operations they implement exists (if it exists) 210 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 211 */ 212 213 /* 214 * Default vop for filesystems that do not support name lookup 215 */ 216 static int 217 vop_nolookup(ap) 218 struct vop_lookup_args /* { 219 struct vnode *a_dvp; 220 struct vnode **a_vpp; 221 struct componentname *a_cnp; 222 } */ *ap; 223 { 224 225 *ap->a_vpp = NULL; 226 return (ENOTDIR); 227 } 228 229 /* 230 * vop_norename: 231 * 232 * Handle unlock and reference counting for arguments of vop_rename 233 * for filesystems that do not implement rename operation. 234 */ 235 static int 236 vop_norename(struct vop_rename_args *ap) 237 { 238 239 vop_rename_fail(ap); 240 return (EOPNOTSUPP); 241 } 242 243 /* 244 * vop_nostrategy: 245 * 246 * Strategy routine for VFS devices that have none. 247 * 248 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 249 * routine. Typically this is done for a BIO_READ strategy call. 250 * Typically B_INVAL is assumed to already be clear prior to a write 251 * and should not be cleared manually unless you just made the buffer 252 * invalid. BIO_ERROR should be cleared either way. 253 */ 254 255 static int 256 vop_nostrategy (struct vop_strategy_args *ap) 257 { 258 printf("No strategy for buffer at %p\n", ap->a_bp); 259 vprint("vnode", ap->a_vp); 260 ap->a_bp->b_ioflags |= BIO_ERROR; 261 ap->a_bp->b_error = EOPNOTSUPP; 262 bufdone(ap->a_bp); 263 return (EOPNOTSUPP); 264 } 265 266 static int 267 get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf, 268 int dirbuflen, off_t *off, char **cpos, int *len, 269 int *eofflag, struct thread *td) 270 { 271 int error, reclen; 272 struct uio uio; 273 struct iovec iov; 274 struct dirent *dp; 275 276 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 277 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 278 279 if (*len == 0) { 280 iov.iov_base = dirbuf; 281 iov.iov_len = dirbuflen; 282 283 uio.uio_iov = &iov; 284 uio.uio_iovcnt = 1; 285 uio.uio_offset = *off; 286 uio.uio_resid = dirbuflen; 287 uio.uio_segflg = UIO_SYSSPACE; 288 uio.uio_rw = UIO_READ; 289 uio.uio_td = td; 290 291 *eofflag = 0; 292 293 #ifdef MAC 294 error = mac_vnode_check_readdir(td->td_ucred, vp); 295 if (error == 0) 296 #endif 297 error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag, 298 NULL, NULL); 299 if (error) 300 return (error); 301 302 *off = uio.uio_offset; 303 304 *cpos = dirbuf; 305 *len = (dirbuflen - uio.uio_resid); 306 307 if (*len == 0) 308 return (ENOENT); 309 } 310 311 dp = (struct dirent *)(*cpos); 312 reclen = dp->d_reclen; 313 *dpp = dp; 314 315 /* check for malformed directory.. */ 316 if (reclen < DIRENT_MINSIZE) 317 return (EINVAL); 318 319 *cpos += reclen; 320 *len -= reclen; 321 322 return (0); 323 } 324 325 /* 326 * Check if a named file exists in a given directory vnode. 327 */ 328 static int 329 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 330 { 331 char *dirbuf, *cpos; 332 int error, eofflag, dirbuflen, len, found; 333 off_t off; 334 struct dirent *dp; 335 struct vattr va; 336 337 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 338 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 339 340 found = 0; 341 342 error = VOP_GETATTR(vp, &va, td->td_ucred); 343 if (error) 344 return (found); 345 346 dirbuflen = DEV_BSIZE; 347 if (dirbuflen < va.va_blocksize) 348 dirbuflen = va.va_blocksize; 349 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 350 351 off = 0; 352 len = 0; 353 do { 354 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off, 355 &cpos, &len, &eofflag, td); 356 if (error) 357 goto out; 358 359 if (dp->d_type != DT_WHT && dp->d_fileno != 0 && 360 strcmp(dp->d_name, dirname) == 0) { 361 found = 1; 362 goto out; 363 } 364 } while (len > 0 || !eofflag); 365 366 out: 367 free(dirbuf, M_TEMP); 368 return (found); 369 } 370 371 int 372 vop_stdaccess(struct vop_access_args *ap) 373 { 374 375 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | 376 VAPPEND)) == 0, ("invalid bit in accmode")); 377 378 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td)); 379 } 380 381 int 382 vop_stdaccessx(struct vop_accessx_args *ap) 383 { 384 int error; 385 accmode_t accmode = ap->a_accmode; 386 387 error = vfs_unixify_accmode(&accmode); 388 if (error != 0) 389 return (error); 390 391 if (accmode == 0) 392 return (0); 393 394 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 395 } 396 397 /* 398 * Advisory record locking support 399 */ 400 int 401 vop_stdadvlock(struct vop_advlock_args *ap) 402 { 403 struct vnode *vp; 404 struct vattr vattr; 405 int error; 406 407 vp = ap->a_vp; 408 if (ap->a_fl->l_whence == SEEK_END) { 409 /* 410 * The NFSv4 server must avoid doing a vn_lock() here, since it 411 * can deadlock the nfsd threads, due to a LOR. Fortunately 412 * the NFSv4 server always uses SEEK_SET and this code is 413 * only required for the SEEK_END case. 414 */ 415 vn_lock(vp, LK_SHARED | LK_RETRY); 416 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 417 VOP_UNLOCK(vp, 0); 418 if (error) 419 return (error); 420 } else 421 vattr.va_size = 0; 422 423 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size)); 424 } 425 426 int 427 vop_stdadvlockasync(struct vop_advlockasync_args *ap) 428 { 429 struct vnode *vp; 430 struct vattr vattr; 431 int error; 432 433 vp = ap->a_vp; 434 if (ap->a_fl->l_whence == SEEK_END) { 435 /* The size argument is only needed for SEEK_END. */ 436 vn_lock(vp, LK_SHARED | LK_RETRY); 437 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 438 VOP_UNLOCK(vp, 0); 439 if (error) 440 return (error); 441 } else 442 vattr.va_size = 0; 443 444 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 445 } 446 447 int 448 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap) 449 { 450 struct vnode *vp; 451 452 vp = ap->a_vp; 453 lf_purgelocks(vp, &vp->v_lockf); 454 return (0); 455 } 456 457 /* 458 * vop_stdpathconf: 459 * 460 * Standard implementation of POSIX pathconf, to get information about limits 461 * for a filesystem. 462 * Override per filesystem for the case where the filesystem has smaller 463 * limits. 464 */ 465 int 466 vop_stdpathconf(ap) 467 struct vop_pathconf_args /* { 468 struct vnode *a_vp; 469 int a_name; 470 int *a_retval; 471 } */ *ap; 472 { 473 474 switch (ap->a_name) { 475 case _PC_ASYNC_IO: 476 *ap->a_retval = _POSIX_ASYNCHRONOUS_IO; 477 return (0); 478 case _PC_NAME_MAX: 479 *ap->a_retval = NAME_MAX; 480 return (0); 481 case _PC_PATH_MAX: 482 *ap->a_retval = PATH_MAX; 483 return (0); 484 case _PC_LINK_MAX: 485 *ap->a_retval = LINK_MAX; 486 return (0); 487 case _PC_MAX_CANON: 488 *ap->a_retval = MAX_CANON; 489 return (0); 490 case _PC_MAX_INPUT: 491 *ap->a_retval = MAX_INPUT; 492 return (0); 493 case _PC_PIPE_BUF: 494 *ap->a_retval = PIPE_BUF; 495 return (0); 496 case _PC_CHOWN_RESTRICTED: 497 *ap->a_retval = 1; 498 return (0); 499 case _PC_VDISABLE: 500 *ap->a_retval = _POSIX_VDISABLE; 501 return (0); 502 default: 503 return (EINVAL); 504 } 505 /* NOTREACHED */ 506 } 507 508 /* 509 * Standard lock, unlock and islocked functions. 510 */ 511 int 512 vop_stdlock(ap) 513 struct vop_lock1_args /* { 514 struct vnode *a_vp; 515 int a_flags; 516 char *file; 517 int line; 518 } */ *ap; 519 { 520 struct vnode *vp = ap->a_vp; 521 522 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp), 523 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file, 524 ap->a_line)); 525 } 526 527 /* See above. */ 528 int 529 vop_stdunlock(ap) 530 struct vop_unlock_args /* { 531 struct vnode *a_vp; 532 int a_flags; 533 } */ *ap; 534 { 535 struct vnode *vp = ap->a_vp; 536 537 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp))); 538 } 539 540 /* See above. */ 541 int 542 vop_stdislocked(ap) 543 struct vop_islocked_args /* { 544 struct vnode *a_vp; 545 } */ *ap; 546 { 547 548 return (lockstatus(ap->a_vp->v_vnlock)); 549 } 550 551 /* 552 * Return true for select/poll. 553 */ 554 int 555 vop_nopoll(ap) 556 struct vop_poll_args /* { 557 struct vnode *a_vp; 558 int a_events; 559 struct ucred *a_cred; 560 struct thread *a_td; 561 } */ *ap; 562 { 563 564 return (poll_no_poll(ap->a_events)); 565 } 566 567 /* 568 * Implement poll for local filesystems that support it. 569 */ 570 int 571 vop_stdpoll(ap) 572 struct vop_poll_args /* { 573 struct vnode *a_vp; 574 int a_events; 575 struct ucred *a_cred; 576 struct thread *a_td; 577 } */ *ap; 578 { 579 if (ap->a_events & ~POLLSTANDARD) 580 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 581 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 582 } 583 584 /* 585 * Return our mount point, as we will take charge of the writes. 586 */ 587 int 588 vop_stdgetwritemount(ap) 589 struct vop_getwritemount_args /* { 590 struct vnode *a_vp; 591 struct mount **a_mpp; 592 } */ *ap; 593 { 594 struct mount *mp; 595 596 /* 597 * XXX Since this is called unlocked we may be recycled while 598 * attempting to ref the mount. If this is the case or mountpoint 599 * will be set to NULL. We only have to prevent this call from 600 * returning with a ref to an incorrect mountpoint. It is not 601 * harmful to return with a ref to our previous mountpoint. 602 */ 603 mp = ap->a_vp->v_mount; 604 if (mp != NULL) { 605 vfs_ref(mp); 606 if (mp != ap->a_vp->v_mount) { 607 vfs_rel(mp); 608 mp = NULL; 609 } 610 } 611 *(ap->a_mpp) = mp; 612 return (0); 613 } 614 615 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 616 int 617 vop_stdbmap(ap) 618 struct vop_bmap_args /* { 619 struct vnode *a_vp; 620 daddr_t a_bn; 621 struct bufobj **a_bop; 622 daddr_t *a_bnp; 623 int *a_runp; 624 int *a_runb; 625 } */ *ap; 626 { 627 628 if (ap->a_bop != NULL) 629 *ap->a_bop = &ap->a_vp->v_bufobj; 630 if (ap->a_bnp != NULL) 631 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 632 if (ap->a_runp != NULL) 633 *ap->a_runp = 0; 634 if (ap->a_runb != NULL) 635 *ap->a_runb = 0; 636 return (0); 637 } 638 639 int 640 vop_stdfsync(ap) 641 struct vop_fsync_args /* { 642 struct vnode *a_vp; 643 struct ucred *a_cred; 644 int a_waitfor; 645 struct thread *a_td; 646 } */ *ap; 647 { 648 struct vnode *vp = ap->a_vp; 649 struct buf *bp; 650 struct bufobj *bo; 651 struct buf *nbp; 652 int error = 0; 653 int maxretry = 1000; /* large, arbitrarily chosen */ 654 655 bo = &vp->v_bufobj; 656 BO_LOCK(bo); 657 loop1: 658 /* 659 * MARK/SCAN initialization to avoid infinite loops. 660 */ 661 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 662 bp->b_vflags &= ~BV_SCANNED; 663 bp->b_error = 0; 664 } 665 666 /* 667 * Flush all dirty buffers associated with a vnode. 668 */ 669 loop2: 670 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 671 if ((bp->b_vflags & BV_SCANNED) != 0) 672 continue; 673 bp->b_vflags |= BV_SCANNED; 674 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 675 if (ap->a_waitfor != MNT_WAIT) 676 continue; 677 if (BUF_LOCK(bp, 678 LK_EXCLUSIVE | LK_INTERLOCK | LK_SLEEPFAIL, 679 BO_LOCKPTR(bo)) != 0) { 680 BO_LOCK(bo); 681 goto loop1; 682 } 683 BO_LOCK(bo); 684 } 685 BO_UNLOCK(bo); 686 KASSERT(bp->b_bufobj == bo, 687 ("bp %p wrong b_bufobj %p should be %p", 688 bp, bp->b_bufobj, bo)); 689 if ((bp->b_flags & B_DELWRI) == 0) 690 panic("fsync: not dirty"); 691 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 692 vfs_bio_awrite(bp); 693 } else { 694 bremfree(bp); 695 bawrite(bp); 696 } 697 BO_LOCK(bo); 698 goto loop2; 699 } 700 701 /* 702 * If synchronous the caller expects us to completely resolve all 703 * dirty buffers in the system. Wait for in-progress I/O to 704 * complete (which could include background bitmap writes), then 705 * retry if dirty blocks still exist. 706 */ 707 if (ap->a_waitfor == MNT_WAIT) { 708 bufobj_wwait(bo, 0, 0); 709 if (bo->bo_dirty.bv_cnt > 0) { 710 /* 711 * If we are unable to write any of these buffers 712 * then we fail now rather than trying endlessly 713 * to write them out. 714 */ 715 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 716 if ((error = bp->b_error) == 0) 717 continue; 718 if (error == 0 && --maxretry >= 0) 719 goto loop1; 720 error = EAGAIN; 721 } 722 } 723 BO_UNLOCK(bo); 724 if (error == EAGAIN) 725 vprint("fsync: giving up on dirty", vp); 726 727 return (error); 728 } 729 730 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 731 int 732 vop_stdgetpages(ap) 733 struct vop_getpages_args /* { 734 struct vnode *a_vp; 735 vm_page_t *a_m; 736 int a_count; 737 int *a_rbehind; 738 int *a_rahead; 739 } */ *ap; 740 { 741 742 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 743 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL); 744 } 745 746 static int 747 vop_stdgetpages_async(struct vop_getpages_async_args *ap) 748 { 749 int error; 750 751 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind, 752 ap->a_rahead); 753 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error); 754 return (error); 755 } 756 757 int 758 vop_stdkqfilter(struct vop_kqfilter_args *ap) 759 { 760 return vfs_kqfilter(ap); 761 } 762 763 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 764 int 765 vop_stdputpages(ap) 766 struct vop_putpages_args /* { 767 struct vnode *a_vp; 768 vm_page_t *a_m; 769 int a_count; 770 int a_sync; 771 int *a_rtvals; 772 } */ *ap; 773 { 774 775 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 776 ap->a_sync, ap->a_rtvals); 777 } 778 779 int 780 vop_stdvptofh(struct vop_vptofh_args *ap) 781 { 782 return (EOPNOTSUPP); 783 } 784 785 int 786 vop_stdvptocnp(struct vop_vptocnp_args *ap) 787 { 788 struct vnode *vp = ap->a_vp; 789 struct vnode **dvp = ap->a_vpp; 790 struct ucred *cred = ap->a_cred; 791 char *buf = ap->a_buf; 792 int *buflen = ap->a_buflen; 793 char *dirbuf, *cpos; 794 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 795 off_t off; 796 ino_t fileno; 797 struct vattr va; 798 struct nameidata nd; 799 struct thread *td; 800 struct dirent *dp; 801 struct vnode *mvp; 802 803 i = *buflen; 804 error = 0; 805 covered = 0; 806 td = curthread; 807 808 if (vp->v_type != VDIR) 809 return (ENOENT); 810 811 error = VOP_GETATTR(vp, &va, cred); 812 if (error) 813 return (error); 814 815 VREF(vp); 816 locked = VOP_ISLOCKED(vp); 817 VOP_UNLOCK(vp, 0); 818 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE, 819 "..", vp, td); 820 flags = FREAD; 821 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 822 if (error) { 823 vn_lock(vp, locked | LK_RETRY); 824 return (error); 825 } 826 NDFREE(&nd, NDF_ONLY_PNBUF); 827 828 mvp = *dvp = nd.ni_vp; 829 830 if (vp->v_mount != (*dvp)->v_mount && 831 ((*dvp)->v_vflag & VV_ROOT) && 832 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 833 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 834 VREF(mvp); 835 VOP_UNLOCK(mvp, 0); 836 vn_close(mvp, FREAD, cred, td); 837 VREF(*dvp); 838 vn_lock(*dvp, LK_SHARED | LK_RETRY); 839 covered = 1; 840 } 841 842 fileno = va.va_fileid; 843 844 dirbuflen = DEV_BSIZE; 845 if (dirbuflen < va.va_blocksize) 846 dirbuflen = va.va_blocksize; 847 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 848 849 if ((*dvp)->v_type != VDIR) { 850 error = ENOENT; 851 goto out; 852 } 853 854 off = 0; 855 len = 0; 856 do { 857 /* call VOP_READDIR of parent */ 858 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 859 &cpos, &len, &eofflag, td); 860 if (error) 861 goto out; 862 863 if ((dp->d_type != DT_WHT) && 864 (dp->d_fileno == fileno)) { 865 if (covered) { 866 VOP_UNLOCK(*dvp, 0); 867 vn_lock(mvp, LK_SHARED | LK_RETRY); 868 if (dirent_exists(mvp, dp->d_name, td)) { 869 error = ENOENT; 870 VOP_UNLOCK(mvp, 0); 871 vn_lock(*dvp, LK_SHARED | LK_RETRY); 872 goto out; 873 } 874 VOP_UNLOCK(mvp, 0); 875 vn_lock(*dvp, LK_SHARED | LK_RETRY); 876 } 877 i -= dp->d_namlen; 878 879 if (i < 0) { 880 error = ENOMEM; 881 goto out; 882 } 883 if (dp->d_namlen == 1 && dp->d_name[0] == '.') { 884 error = ENOENT; 885 } else { 886 bcopy(dp->d_name, buf + i, dp->d_namlen); 887 error = 0; 888 } 889 goto out; 890 } 891 } while (len > 0 || !eofflag); 892 error = ENOENT; 893 894 out: 895 free(dirbuf, M_TEMP); 896 if (!error) { 897 *buflen = i; 898 vref(*dvp); 899 } 900 if (covered) { 901 vput(*dvp); 902 vrele(mvp); 903 } else { 904 VOP_UNLOCK(mvp, 0); 905 vn_close(mvp, FREAD, cred, td); 906 } 907 vn_lock(vp, locked | LK_RETRY); 908 return (error); 909 } 910 911 int 912 vop_stdallocate(struct vop_allocate_args *ap) 913 { 914 #ifdef __notyet__ 915 struct statfs sfs; 916 #endif 917 struct iovec aiov; 918 struct vattr vattr, *vap; 919 struct uio auio; 920 off_t fsize, len, cur, offset; 921 uint8_t *buf; 922 struct thread *td; 923 struct vnode *vp; 924 size_t iosize; 925 int error; 926 927 buf = NULL; 928 error = 0; 929 td = curthread; 930 vap = &vattr; 931 vp = ap->a_vp; 932 len = *ap->a_len; 933 offset = *ap->a_offset; 934 935 error = VOP_GETATTR(vp, vap, td->td_ucred); 936 if (error != 0) 937 goto out; 938 fsize = vap->va_size; 939 iosize = vap->va_blocksize; 940 if (iosize == 0) 941 iosize = BLKDEV_IOSIZE; 942 if (iosize > MAXPHYS) 943 iosize = MAXPHYS; 944 buf = malloc(iosize, M_TEMP, M_WAITOK); 945 946 #ifdef __notyet__ 947 /* 948 * Check if the filesystem sets f_maxfilesize; if not use 949 * VOP_SETATTR to perform the check. 950 */ 951 error = VFS_STATFS(vp->v_mount, &sfs, td); 952 if (error != 0) 953 goto out; 954 if (sfs.f_maxfilesize) { 955 if (offset > sfs.f_maxfilesize || len > sfs.f_maxfilesize || 956 offset + len > sfs.f_maxfilesize) { 957 error = EFBIG; 958 goto out; 959 } 960 } else 961 #endif 962 if (offset + len > vap->va_size) { 963 /* 964 * Test offset + len against the filesystem's maxfilesize. 965 */ 966 VATTR_NULL(vap); 967 vap->va_size = offset + len; 968 error = VOP_SETATTR(vp, vap, td->td_ucred); 969 if (error != 0) 970 goto out; 971 VATTR_NULL(vap); 972 vap->va_size = fsize; 973 error = VOP_SETATTR(vp, vap, td->td_ucred); 974 if (error != 0) 975 goto out; 976 } 977 978 for (;;) { 979 /* 980 * Read and write back anything below the nominal file 981 * size. There's currently no way outside the filesystem 982 * to know whether this area is sparse or not. 983 */ 984 cur = iosize; 985 if ((offset % iosize) != 0) 986 cur -= (offset % iosize); 987 if (cur > len) 988 cur = len; 989 if (offset < fsize) { 990 aiov.iov_base = buf; 991 aiov.iov_len = cur; 992 auio.uio_iov = &aiov; 993 auio.uio_iovcnt = 1; 994 auio.uio_offset = offset; 995 auio.uio_resid = cur; 996 auio.uio_segflg = UIO_SYSSPACE; 997 auio.uio_rw = UIO_READ; 998 auio.uio_td = td; 999 error = VOP_READ(vp, &auio, 0, td->td_ucred); 1000 if (error != 0) 1001 break; 1002 if (auio.uio_resid > 0) { 1003 bzero(buf + cur - auio.uio_resid, 1004 auio.uio_resid); 1005 } 1006 } else { 1007 bzero(buf, cur); 1008 } 1009 1010 aiov.iov_base = buf; 1011 aiov.iov_len = cur; 1012 auio.uio_iov = &aiov; 1013 auio.uio_iovcnt = 1; 1014 auio.uio_offset = offset; 1015 auio.uio_resid = cur; 1016 auio.uio_segflg = UIO_SYSSPACE; 1017 auio.uio_rw = UIO_WRITE; 1018 auio.uio_td = td; 1019 1020 error = VOP_WRITE(vp, &auio, 0, td->td_ucred); 1021 if (error != 0) 1022 break; 1023 1024 len -= cur; 1025 offset += cur; 1026 if (len == 0) 1027 break; 1028 if (should_yield()) 1029 break; 1030 } 1031 1032 out: 1033 *ap->a_len = len; 1034 *ap->a_offset = offset; 1035 free(buf, M_TEMP); 1036 return (error); 1037 } 1038 1039 int 1040 vop_stdadvise(struct vop_advise_args *ap) 1041 { 1042 struct vnode *vp; 1043 struct bufobj *bo; 1044 daddr_t startn, endn; 1045 off_t start, end; 1046 int bsize, error; 1047 1048 vp = ap->a_vp; 1049 switch (ap->a_advice) { 1050 case POSIX_FADV_WILLNEED: 1051 /* 1052 * Do nothing for now. Filesystems should provide a 1053 * custom method which starts an asynchronous read of 1054 * the requested region. 1055 */ 1056 error = 0; 1057 break; 1058 case POSIX_FADV_DONTNEED: 1059 error = 0; 1060 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1061 if (vp->v_iflag & VI_DOOMED) { 1062 VOP_UNLOCK(vp, 0); 1063 break; 1064 } 1065 1066 /* 1067 * Deactivate pages in the specified range from the backing VM 1068 * object. Pages that are resident in the buffer cache will 1069 * remain wired until their corresponding buffers are released 1070 * below. 1071 */ 1072 if (vp->v_object != NULL) { 1073 start = trunc_page(ap->a_start); 1074 end = round_page(ap->a_end); 1075 VM_OBJECT_WLOCK(vp->v_object); 1076 vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start), 1077 OFF_TO_IDX(end)); 1078 VM_OBJECT_WUNLOCK(vp->v_object); 1079 } 1080 1081 bo = &vp->v_bufobj; 1082 BO_RLOCK(bo); 1083 bsize = vp->v_bufobj.bo_bsize; 1084 startn = ap->a_start / bsize; 1085 endn = ap->a_end / bsize; 1086 error = bnoreuselist(&bo->bo_clean, bo, startn, endn); 1087 if (error == 0) 1088 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn); 1089 BO_RUNLOCK(bo); 1090 VOP_UNLOCK(vp, 0); 1091 break; 1092 default: 1093 error = EINVAL; 1094 break; 1095 } 1096 return (error); 1097 } 1098 1099 int 1100 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1101 { 1102 1103 ap->a_vp->v_socket = ap->a_socket; 1104 return (0); 1105 } 1106 1107 int 1108 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1109 { 1110 1111 *ap->a_socket = ap->a_vp->v_socket; 1112 return (0); 1113 } 1114 1115 int 1116 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1117 { 1118 1119 ap->a_vp->v_socket = NULL; 1120 return (0); 1121 } 1122 1123 static int 1124 vop_stdis_text(struct vop_is_text_args *ap) 1125 { 1126 1127 return ((ap->a_vp->v_vflag & VV_TEXT) != 0); 1128 } 1129 1130 static int 1131 vop_stdset_text(struct vop_set_text_args *ap) 1132 { 1133 1134 ap->a_vp->v_vflag |= VV_TEXT; 1135 return (0); 1136 } 1137 1138 static int 1139 vop_stdunset_text(struct vop_unset_text_args *ap) 1140 { 1141 1142 ap->a_vp->v_vflag &= ~VV_TEXT; 1143 return (0); 1144 } 1145 1146 static int 1147 vop_stdget_writecount(struct vop_get_writecount_args *ap) 1148 { 1149 1150 *ap->a_writecount = ap->a_vp->v_writecount; 1151 return (0); 1152 } 1153 1154 static int 1155 vop_stdadd_writecount(struct vop_add_writecount_args *ap) 1156 { 1157 1158 ap->a_vp->v_writecount += ap->a_inc; 1159 return (0); 1160 } 1161 1162 /* 1163 * vfs default ops 1164 * used to fill the vfs function table to get reasonable default return values. 1165 */ 1166 int 1167 vfs_stdroot (mp, flags, vpp) 1168 struct mount *mp; 1169 int flags; 1170 struct vnode **vpp; 1171 { 1172 1173 return (EOPNOTSUPP); 1174 } 1175 1176 int 1177 vfs_stdstatfs (mp, sbp) 1178 struct mount *mp; 1179 struct statfs *sbp; 1180 { 1181 1182 return (EOPNOTSUPP); 1183 } 1184 1185 int 1186 vfs_stdquotactl (mp, cmds, uid, arg) 1187 struct mount *mp; 1188 int cmds; 1189 uid_t uid; 1190 void *arg; 1191 { 1192 1193 return (EOPNOTSUPP); 1194 } 1195 1196 int 1197 vfs_stdsync(mp, waitfor) 1198 struct mount *mp; 1199 int waitfor; 1200 { 1201 struct vnode *vp, *mvp; 1202 struct thread *td; 1203 int error, lockreq, allerror = 0; 1204 1205 td = curthread; 1206 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1207 if (waitfor != MNT_WAIT) 1208 lockreq |= LK_NOWAIT; 1209 /* 1210 * Force stale buffer cache information to be flushed. 1211 */ 1212 loop: 1213 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1214 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1215 VI_UNLOCK(vp); 1216 continue; 1217 } 1218 if ((error = vget(vp, lockreq, td)) != 0) { 1219 if (error == ENOENT) { 1220 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1221 goto loop; 1222 } 1223 continue; 1224 } 1225 error = VOP_FSYNC(vp, waitfor, td); 1226 if (error) 1227 allerror = error; 1228 vput(vp); 1229 } 1230 return (allerror); 1231 } 1232 1233 int 1234 vfs_stdnosync (mp, waitfor) 1235 struct mount *mp; 1236 int waitfor; 1237 { 1238 1239 return (0); 1240 } 1241 1242 int 1243 vfs_stdvget (mp, ino, flags, vpp) 1244 struct mount *mp; 1245 ino_t ino; 1246 int flags; 1247 struct vnode **vpp; 1248 { 1249 1250 return (EOPNOTSUPP); 1251 } 1252 1253 int 1254 vfs_stdfhtovp (mp, fhp, flags, vpp) 1255 struct mount *mp; 1256 struct fid *fhp; 1257 int flags; 1258 struct vnode **vpp; 1259 { 1260 1261 return (EOPNOTSUPP); 1262 } 1263 1264 int 1265 vfs_stdinit (vfsp) 1266 struct vfsconf *vfsp; 1267 { 1268 1269 return (0); 1270 } 1271 1272 int 1273 vfs_stduninit (vfsp) 1274 struct vfsconf *vfsp; 1275 { 1276 1277 return(0); 1278 } 1279 1280 int 1281 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 1282 struct mount *mp; 1283 int cmd; 1284 struct vnode *filename_vp; 1285 int attrnamespace; 1286 const char *attrname; 1287 { 1288 1289 if (filename_vp != NULL) 1290 VOP_UNLOCK(filename_vp, 0); 1291 return (EOPNOTSUPP); 1292 } 1293 1294 int 1295 vfs_stdsysctl(mp, op, req) 1296 struct mount *mp; 1297 fsctlop_t op; 1298 struct sysctl_req *req; 1299 { 1300 1301 return (EOPNOTSUPP); 1302 } 1303 1304 /* end of vfs default ops */ 1305