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_NAME_MAX: 476 *ap->a_retval = NAME_MAX; 477 return (0); 478 case _PC_PATH_MAX: 479 *ap->a_retval = PATH_MAX; 480 return (0); 481 case _PC_LINK_MAX: 482 *ap->a_retval = LINK_MAX; 483 return (0); 484 case _PC_MAX_CANON: 485 *ap->a_retval = MAX_CANON; 486 return (0); 487 case _PC_MAX_INPUT: 488 *ap->a_retval = MAX_INPUT; 489 return (0); 490 case _PC_PIPE_BUF: 491 *ap->a_retval = PIPE_BUF; 492 return (0); 493 case _PC_CHOWN_RESTRICTED: 494 *ap->a_retval = 1; 495 return (0); 496 case _PC_VDISABLE: 497 *ap->a_retval = _POSIX_VDISABLE; 498 return (0); 499 default: 500 return (EINVAL); 501 } 502 /* NOTREACHED */ 503 } 504 505 /* 506 * Standard lock, unlock and islocked functions. 507 */ 508 int 509 vop_stdlock(ap) 510 struct vop_lock1_args /* { 511 struct vnode *a_vp; 512 int a_flags; 513 char *file; 514 int line; 515 } */ *ap; 516 { 517 struct vnode *vp = ap->a_vp; 518 519 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp), 520 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file, 521 ap->a_line)); 522 } 523 524 /* See above. */ 525 int 526 vop_stdunlock(ap) 527 struct vop_unlock_args /* { 528 struct vnode *a_vp; 529 int a_flags; 530 } */ *ap; 531 { 532 struct vnode *vp = ap->a_vp; 533 534 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp))); 535 } 536 537 /* See above. */ 538 int 539 vop_stdislocked(ap) 540 struct vop_islocked_args /* { 541 struct vnode *a_vp; 542 } */ *ap; 543 { 544 545 return (lockstatus(ap->a_vp->v_vnlock)); 546 } 547 548 /* 549 * Return true for select/poll. 550 */ 551 int 552 vop_nopoll(ap) 553 struct vop_poll_args /* { 554 struct vnode *a_vp; 555 int a_events; 556 struct ucred *a_cred; 557 struct thread *a_td; 558 } */ *ap; 559 { 560 561 return (poll_no_poll(ap->a_events)); 562 } 563 564 /* 565 * Implement poll for local filesystems that support it. 566 */ 567 int 568 vop_stdpoll(ap) 569 struct vop_poll_args /* { 570 struct vnode *a_vp; 571 int a_events; 572 struct ucred *a_cred; 573 struct thread *a_td; 574 } */ *ap; 575 { 576 if (ap->a_events & ~POLLSTANDARD) 577 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 578 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 579 } 580 581 /* 582 * Return our mount point, as we will take charge of the writes. 583 */ 584 int 585 vop_stdgetwritemount(ap) 586 struct vop_getwritemount_args /* { 587 struct vnode *a_vp; 588 struct mount **a_mpp; 589 } */ *ap; 590 { 591 struct mount *mp; 592 593 /* 594 * XXX Since this is called unlocked we may be recycled while 595 * attempting to ref the mount. If this is the case or mountpoint 596 * will be set to NULL. We only have to prevent this call from 597 * returning with a ref to an incorrect mountpoint. It is not 598 * harmful to return with a ref to our previous mountpoint. 599 */ 600 mp = ap->a_vp->v_mount; 601 if (mp != NULL) { 602 vfs_ref(mp); 603 if (mp != ap->a_vp->v_mount) { 604 vfs_rel(mp); 605 mp = NULL; 606 } 607 } 608 *(ap->a_mpp) = mp; 609 return (0); 610 } 611 612 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 613 int 614 vop_stdbmap(ap) 615 struct vop_bmap_args /* { 616 struct vnode *a_vp; 617 daddr_t a_bn; 618 struct bufobj **a_bop; 619 daddr_t *a_bnp; 620 int *a_runp; 621 int *a_runb; 622 } */ *ap; 623 { 624 625 if (ap->a_bop != NULL) 626 *ap->a_bop = &ap->a_vp->v_bufobj; 627 if (ap->a_bnp != NULL) 628 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 629 if (ap->a_runp != NULL) 630 *ap->a_runp = 0; 631 if (ap->a_runb != NULL) 632 *ap->a_runb = 0; 633 return (0); 634 } 635 636 int 637 vop_stdfsync(ap) 638 struct vop_fsync_args /* { 639 struct vnode *a_vp; 640 struct ucred *a_cred; 641 int a_waitfor; 642 struct thread *a_td; 643 } */ *ap; 644 { 645 struct vnode *vp = ap->a_vp; 646 struct buf *bp; 647 struct bufobj *bo; 648 struct buf *nbp; 649 int error = 0; 650 int maxretry = 1000; /* large, arbitrarily chosen */ 651 652 bo = &vp->v_bufobj; 653 BO_LOCK(bo); 654 loop1: 655 /* 656 * MARK/SCAN initialization to avoid infinite loops. 657 */ 658 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 659 bp->b_vflags &= ~BV_SCANNED; 660 bp->b_error = 0; 661 } 662 663 /* 664 * Flush all dirty buffers associated with a vnode. 665 */ 666 loop2: 667 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 668 if ((bp->b_vflags & BV_SCANNED) != 0) 669 continue; 670 bp->b_vflags |= BV_SCANNED; 671 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 672 if (ap->a_waitfor != MNT_WAIT) 673 continue; 674 if (BUF_LOCK(bp, 675 LK_EXCLUSIVE | LK_INTERLOCK | LK_SLEEPFAIL, 676 BO_LOCKPTR(bo)) != 0) { 677 BO_LOCK(bo); 678 goto loop1; 679 } 680 BO_LOCK(bo); 681 } 682 BO_UNLOCK(bo); 683 KASSERT(bp->b_bufobj == bo, 684 ("bp %p wrong b_bufobj %p should be %p", 685 bp, bp->b_bufobj, bo)); 686 if ((bp->b_flags & B_DELWRI) == 0) 687 panic("fsync: not dirty"); 688 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 689 vfs_bio_awrite(bp); 690 } else { 691 bremfree(bp); 692 bawrite(bp); 693 } 694 BO_LOCK(bo); 695 goto loop2; 696 } 697 698 /* 699 * If synchronous the caller expects us to completely resolve all 700 * dirty buffers in the system. Wait for in-progress I/O to 701 * complete (which could include background bitmap writes), then 702 * retry if dirty blocks still exist. 703 */ 704 if (ap->a_waitfor == MNT_WAIT) { 705 bufobj_wwait(bo, 0, 0); 706 if (bo->bo_dirty.bv_cnt > 0) { 707 /* 708 * If we are unable to write any of these buffers 709 * then we fail now rather than trying endlessly 710 * to write them out. 711 */ 712 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 713 if ((error = bp->b_error) == 0) 714 continue; 715 if (error == 0 && --maxretry >= 0) 716 goto loop1; 717 error = EAGAIN; 718 } 719 } 720 BO_UNLOCK(bo); 721 if (error == EAGAIN) 722 vprint("fsync: giving up on dirty", vp); 723 724 return (error); 725 } 726 727 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 728 int 729 vop_stdgetpages(ap) 730 struct vop_getpages_args /* { 731 struct vnode *a_vp; 732 vm_page_t *a_m; 733 int a_count; 734 int *a_rbehind; 735 int *a_rahead; 736 } */ *ap; 737 { 738 739 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 740 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL); 741 } 742 743 static int 744 vop_stdgetpages_async(struct vop_getpages_async_args *ap) 745 { 746 int error; 747 748 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind, 749 ap->a_rahead); 750 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error); 751 return (error); 752 } 753 754 int 755 vop_stdkqfilter(struct vop_kqfilter_args *ap) 756 { 757 return vfs_kqfilter(ap); 758 } 759 760 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 761 int 762 vop_stdputpages(ap) 763 struct vop_putpages_args /* { 764 struct vnode *a_vp; 765 vm_page_t *a_m; 766 int a_count; 767 int a_sync; 768 int *a_rtvals; 769 } */ *ap; 770 { 771 772 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 773 ap->a_sync, ap->a_rtvals); 774 } 775 776 int 777 vop_stdvptofh(struct vop_vptofh_args *ap) 778 { 779 return (EOPNOTSUPP); 780 } 781 782 int 783 vop_stdvptocnp(struct vop_vptocnp_args *ap) 784 { 785 struct vnode *vp = ap->a_vp; 786 struct vnode **dvp = ap->a_vpp; 787 struct ucred *cred = ap->a_cred; 788 char *buf = ap->a_buf; 789 int *buflen = ap->a_buflen; 790 char *dirbuf, *cpos; 791 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 792 off_t off; 793 ino_t fileno; 794 struct vattr va; 795 struct nameidata nd; 796 struct thread *td; 797 struct dirent *dp; 798 struct vnode *mvp; 799 800 i = *buflen; 801 error = 0; 802 covered = 0; 803 td = curthread; 804 805 if (vp->v_type != VDIR) 806 return (ENOENT); 807 808 error = VOP_GETATTR(vp, &va, cred); 809 if (error) 810 return (error); 811 812 VREF(vp); 813 locked = VOP_ISLOCKED(vp); 814 VOP_UNLOCK(vp, 0); 815 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE, 816 "..", vp, td); 817 flags = FREAD; 818 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 819 if (error) { 820 vn_lock(vp, locked | LK_RETRY); 821 return (error); 822 } 823 NDFREE(&nd, NDF_ONLY_PNBUF); 824 825 mvp = *dvp = nd.ni_vp; 826 827 if (vp->v_mount != (*dvp)->v_mount && 828 ((*dvp)->v_vflag & VV_ROOT) && 829 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 830 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 831 VREF(mvp); 832 VOP_UNLOCK(mvp, 0); 833 vn_close(mvp, FREAD, cred, td); 834 VREF(*dvp); 835 vn_lock(*dvp, LK_SHARED | LK_RETRY); 836 covered = 1; 837 } 838 839 fileno = va.va_fileid; 840 841 dirbuflen = DEV_BSIZE; 842 if (dirbuflen < va.va_blocksize) 843 dirbuflen = va.va_blocksize; 844 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 845 846 if ((*dvp)->v_type != VDIR) { 847 error = ENOENT; 848 goto out; 849 } 850 851 off = 0; 852 len = 0; 853 do { 854 /* call VOP_READDIR of parent */ 855 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 856 &cpos, &len, &eofflag, td); 857 if (error) 858 goto out; 859 860 if ((dp->d_type != DT_WHT) && 861 (dp->d_fileno == fileno)) { 862 if (covered) { 863 VOP_UNLOCK(*dvp, 0); 864 vn_lock(mvp, LK_SHARED | LK_RETRY); 865 if (dirent_exists(mvp, dp->d_name, td)) { 866 error = ENOENT; 867 VOP_UNLOCK(mvp, 0); 868 vn_lock(*dvp, LK_SHARED | LK_RETRY); 869 goto out; 870 } 871 VOP_UNLOCK(mvp, 0); 872 vn_lock(*dvp, LK_SHARED | LK_RETRY); 873 } 874 i -= dp->d_namlen; 875 876 if (i < 0) { 877 error = ENOMEM; 878 goto out; 879 } 880 if (dp->d_namlen == 1 && dp->d_name[0] == '.') { 881 error = ENOENT; 882 } else { 883 bcopy(dp->d_name, buf + i, dp->d_namlen); 884 error = 0; 885 } 886 goto out; 887 } 888 } while (len > 0 || !eofflag); 889 error = ENOENT; 890 891 out: 892 free(dirbuf, M_TEMP); 893 if (!error) { 894 *buflen = i; 895 vref(*dvp); 896 } 897 if (covered) { 898 vput(*dvp); 899 vrele(mvp); 900 } else { 901 VOP_UNLOCK(mvp, 0); 902 vn_close(mvp, FREAD, cred, td); 903 } 904 vn_lock(vp, locked | LK_RETRY); 905 return (error); 906 } 907 908 int 909 vop_stdallocate(struct vop_allocate_args *ap) 910 { 911 #ifdef __notyet__ 912 struct statfs sfs; 913 #endif 914 struct iovec aiov; 915 struct vattr vattr, *vap; 916 struct uio auio; 917 off_t fsize, len, cur, offset; 918 uint8_t *buf; 919 struct thread *td; 920 struct vnode *vp; 921 size_t iosize; 922 int error; 923 924 buf = NULL; 925 error = 0; 926 td = curthread; 927 vap = &vattr; 928 vp = ap->a_vp; 929 len = *ap->a_len; 930 offset = *ap->a_offset; 931 932 error = VOP_GETATTR(vp, vap, td->td_ucred); 933 if (error != 0) 934 goto out; 935 fsize = vap->va_size; 936 iosize = vap->va_blocksize; 937 if (iosize == 0) 938 iosize = BLKDEV_IOSIZE; 939 if (iosize > MAXPHYS) 940 iosize = MAXPHYS; 941 buf = malloc(iosize, M_TEMP, M_WAITOK); 942 943 #ifdef __notyet__ 944 /* 945 * Check if the filesystem sets f_maxfilesize; if not use 946 * VOP_SETATTR to perform the check. 947 */ 948 error = VFS_STATFS(vp->v_mount, &sfs, td); 949 if (error != 0) 950 goto out; 951 if (sfs.f_maxfilesize) { 952 if (offset > sfs.f_maxfilesize || len > sfs.f_maxfilesize || 953 offset + len > sfs.f_maxfilesize) { 954 error = EFBIG; 955 goto out; 956 } 957 } else 958 #endif 959 if (offset + len > vap->va_size) { 960 /* 961 * Test offset + len against the filesystem's maxfilesize. 962 */ 963 VATTR_NULL(vap); 964 vap->va_size = offset + len; 965 error = VOP_SETATTR(vp, vap, td->td_ucred); 966 if (error != 0) 967 goto out; 968 VATTR_NULL(vap); 969 vap->va_size = fsize; 970 error = VOP_SETATTR(vp, vap, td->td_ucred); 971 if (error != 0) 972 goto out; 973 } 974 975 for (;;) { 976 /* 977 * Read and write back anything below the nominal file 978 * size. There's currently no way outside the filesystem 979 * to know whether this area is sparse or not. 980 */ 981 cur = iosize; 982 if ((offset % iosize) != 0) 983 cur -= (offset % iosize); 984 if (cur > len) 985 cur = len; 986 if (offset < fsize) { 987 aiov.iov_base = buf; 988 aiov.iov_len = cur; 989 auio.uio_iov = &aiov; 990 auio.uio_iovcnt = 1; 991 auio.uio_offset = offset; 992 auio.uio_resid = cur; 993 auio.uio_segflg = UIO_SYSSPACE; 994 auio.uio_rw = UIO_READ; 995 auio.uio_td = td; 996 error = VOP_READ(vp, &auio, 0, td->td_ucred); 997 if (error != 0) 998 break; 999 if (auio.uio_resid > 0) { 1000 bzero(buf + cur - auio.uio_resid, 1001 auio.uio_resid); 1002 } 1003 } else { 1004 bzero(buf, cur); 1005 } 1006 1007 aiov.iov_base = buf; 1008 aiov.iov_len = cur; 1009 auio.uio_iov = &aiov; 1010 auio.uio_iovcnt = 1; 1011 auio.uio_offset = offset; 1012 auio.uio_resid = cur; 1013 auio.uio_segflg = UIO_SYSSPACE; 1014 auio.uio_rw = UIO_WRITE; 1015 auio.uio_td = td; 1016 1017 error = VOP_WRITE(vp, &auio, 0, td->td_ucred); 1018 if (error != 0) 1019 break; 1020 1021 len -= cur; 1022 offset += cur; 1023 if (len == 0) 1024 break; 1025 if (should_yield()) 1026 break; 1027 } 1028 1029 out: 1030 *ap->a_len = len; 1031 *ap->a_offset = offset; 1032 free(buf, M_TEMP); 1033 return (error); 1034 } 1035 1036 int 1037 vop_stdadvise(struct vop_advise_args *ap) 1038 { 1039 struct vnode *vp; 1040 struct bufobj *bo; 1041 daddr_t startn, endn; 1042 off_t start, end; 1043 int bsize, error; 1044 1045 vp = ap->a_vp; 1046 switch (ap->a_advice) { 1047 case POSIX_FADV_WILLNEED: 1048 /* 1049 * Do nothing for now. Filesystems should provide a 1050 * custom method which starts an asynchronous read of 1051 * the requested region. 1052 */ 1053 error = 0; 1054 break; 1055 case POSIX_FADV_DONTNEED: 1056 error = 0; 1057 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1058 if (vp->v_iflag & VI_DOOMED) { 1059 VOP_UNLOCK(vp, 0); 1060 break; 1061 } 1062 1063 /* 1064 * Deactivate pages in the specified range from the backing VM 1065 * object. Pages that are resident in the buffer cache will 1066 * remain wired until their corresponding buffers are released 1067 * below. 1068 */ 1069 if (vp->v_object != NULL) { 1070 start = trunc_page(ap->a_start); 1071 end = round_page(ap->a_end); 1072 VM_OBJECT_WLOCK(vp->v_object); 1073 vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start), 1074 OFF_TO_IDX(end)); 1075 VM_OBJECT_WUNLOCK(vp->v_object); 1076 } 1077 1078 bo = &vp->v_bufobj; 1079 BO_RLOCK(bo); 1080 bsize = vp->v_bufobj.bo_bsize; 1081 startn = ap->a_start / bsize; 1082 endn = ap->a_end / bsize; 1083 error = bnoreuselist(&bo->bo_clean, bo, startn, endn); 1084 if (error == 0) 1085 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn); 1086 BO_RUNLOCK(bo); 1087 VOP_UNLOCK(vp, 0); 1088 break; 1089 default: 1090 error = EINVAL; 1091 break; 1092 } 1093 return (error); 1094 } 1095 1096 int 1097 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1098 { 1099 1100 ap->a_vp->v_socket = ap->a_socket; 1101 return (0); 1102 } 1103 1104 int 1105 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1106 { 1107 1108 *ap->a_socket = ap->a_vp->v_socket; 1109 return (0); 1110 } 1111 1112 int 1113 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1114 { 1115 1116 ap->a_vp->v_socket = NULL; 1117 return (0); 1118 } 1119 1120 static int 1121 vop_stdis_text(struct vop_is_text_args *ap) 1122 { 1123 1124 return ((ap->a_vp->v_vflag & VV_TEXT) != 0); 1125 } 1126 1127 static int 1128 vop_stdset_text(struct vop_set_text_args *ap) 1129 { 1130 1131 ap->a_vp->v_vflag |= VV_TEXT; 1132 return (0); 1133 } 1134 1135 static int 1136 vop_stdunset_text(struct vop_unset_text_args *ap) 1137 { 1138 1139 ap->a_vp->v_vflag &= ~VV_TEXT; 1140 return (0); 1141 } 1142 1143 static int 1144 vop_stdget_writecount(struct vop_get_writecount_args *ap) 1145 { 1146 1147 *ap->a_writecount = ap->a_vp->v_writecount; 1148 return (0); 1149 } 1150 1151 static int 1152 vop_stdadd_writecount(struct vop_add_writecount_args *ap) 1153 { 1154 1155 ap->a_vp->v_writecount += ap->a_inc; 1156 return (0); 1157 } 1158 1159 /* 1160 * vfs default ops 1161 * used to fill the vfs function table to get reasonable default return values. 1162 */ 1163 int 1164 vfs_stdroot (mp, flags, vpp) 1165 struct mount *mp; 1166 int flags; 1167 struct vnode **vpp; 1168 { 1169 1170 return (EOPNOTSUPP); 1171 } 1172 1173 int 1174 vfs_stdstatfs (mp, sbp) 1175 struct mount *mp; 1176 struct statfs *sbp; 1177 { 1178 1179 return (EOPNOTSUPP); 1180 } 1181 1182 int 1183 vfs_stdquotactl (mp, cmds, uid, arg) 1184 struct mount *mp; 1185 int cmds; 1186 uid_t uid; 1187 void *arg; 1188 { 1189 1190 return (EOPNOTSUPP); 1191 } 1192 1193 int 1194 vfs_stdsync(mp, waitfor) 1195 struct mount *mp; 1196 int waitfor; 1197 { 1198 struct vnode *vp, *mvp; 1199 struct thread *td; 1200 int error, lockreq, allerror = 0; 1201 1202 td = curthread; 1203 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1204 if (waitfor != MNT_WAIT) 1205 lockreq |= LK_NOWAIT; 1206 /* 1207 * Force stale buffer cache information to be flushed. 1208 */ 1209 loop: 1210 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1211 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1212 VI_UNLOCK(vp); 1213 continue; 1214 } 1215 if ((error = vget(vp, lockreq, td)) != 0) { 1216 if (error == ENOENT) { 1217 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1218 goto loop; 1219 } 1220 continue; 1221 } 1222 error = VOP_FSYNC(vp, waitfor, td); 1223 if (error) 1224 allerror = error; 1225 vput(vp); 1226 } 1227 return (allerror); 1228 } 1229 1230 int 1231 vfs_stdnosync (mp, waitfor) 1232 struct mount *mp; 1233 int waitfor; 1234 { 1235 1236 return (0); 1237 } 1238 1239 int 1240 vfs_stdvget (mp, ino, flags, vpp) 1241 struct mount *mp; 1242 ino_t ino; 1243 int flags; 1244 struct vnode **vpp; 1245 { 1246 1247 return (EOPNOTSUPP); 1248 } 1249 1250 int 1251 vfs_stdfhtovp (mp, fhp, flags, vpp) 1252 struct mount *mp; 1253 struct fid *fhp; 1254 int flags; 1255 struct vnode **vpp; 1256 { 1257 1258 return (EOPNOTSUPP); 1259 } 1260 1261 int 1262 vfs_stdinit (vfsp) 1263 struct vfsconf *vfsp; 1264 { 1265 1266 return (0); 1267 } 1268 1269 int 1270 vfs_stduninit (vfsp) 1271 struct vfsconf *vfsp; 1272 { 1273 1274 return(0); 1275 } 1276 1277 int 1278 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 1279 struct mount *mp; 1280 int cmd; 1281 struct vnode *filename_vp; 1282 int attrnamespace; 1283 const char *attrname; 1284 { 1285 1286 if (filename_vp != NULL) 1287 VOP_UNLOCK(filename_vp, 0); 1288 return (EOPNOTSUPP); 1289 } 1290 1291 int 1292 vfs_stdsysctl(mp, op, req) 1293 struct mount *mp; 1294 fsctlop_t op; 1295 struct sysctl_req *req; 1296 { 1297 1298 return (EOPNOTSUPP); 1299 } 1300 1301 /* end of vfs default ops */ 1302