Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/kern/vfs_default.c
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1 /*- 2 * 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: releng/11.1/sys/kern/vfs_default.c 315475 2017-03-18 05:53:09Z alc $"); 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_stdfdatasync(struct vop_fdatasync_args *ap); 87 static int vop_stdgetpages_async(struct vop_getpages_async_args *ap); 88 89 /* 90 * This vnode table stores what we want to do if the filesystem doesn't 91 * implement a particular VOP. 92 * 93 * If there is no specific entry here, we will return EOPNOTSUPP. 94 * 95 * Note that every filesystem has to implement either vop_access 96 * or vop_accessx; failing to do so will result in immediate crash 97 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(), 98 * which calls vop_stdaccess() etc. 99 */ 100 101 struct vop_vector default_vnodeops = { 102 .vop_default = NULL, 103 .vop_bypass = VOP_EOPNOTSUPP, 104 105 .vop_access = vop_stdaccess, 106 .vop_accessx = vop_stdaccessx, 107 .vop_advise = vop_stdadvise, 108 .vop_advlock = vop_stdadvlock, 109 .vop_advlockasync = vop_stdadvlockasync, 110 .vop_advlockpurge = vop_stdadvlockpurge, 111 .vop_allocate = vop_stdallocate, 112 .vop_bmap = vop_stdbmap, 113 .vop_close = VOP_NULL, 114 .vop_fsync = VOP_NULL, 115 .vop_fdatasync = vop_stdfdatasync, 116 .vop_getpages = vop_stdgetpages, 117 .vop_getpages_async = vop_stdgetpages_async, 118 .vop_getwritemount = vop_stdgetwritemount, 119 .vop_inactive = VOP_NULL, 120 .vop_ioctl = VOP_ENOTTY, 121 .vop_kqfilter = vop_stdkqfilter, 122 .vop_islocked = vop_stdislocked, 123 .vop_lock1 = vop_stdlock, 124 .vop_lookup = vop_nolookup, 125 .vop_open = VOP_NULL, 126 .vop_pathconf = VOP_EINVAL, 127 .vop_poll = vop_nopoll, 128 .vop_putpages = vop_stdputpages, 129 .vop_readlink = VOP_EINVAL, 130 .vop_rename = vop_norename, 131 .vop_revoke = VOP_PANIC, 132 .vop_strategy = vop_nostrategy, 133 .vop_unlock = vop_stdunlock, 134 .vop_vptocnp = vop_stdvptocnp, 135 .vop_vptofh = vop_stdvptofh, 136 .vop_unp_bind = vop_stdunp_bind, 137 .vop_unp_connect = vop_stdunp_connect, 138 .vop_unp_detach = vop_stdunp_detach, 139 .vop_is_text = vop_stdis_text, 140 .vop_set_text = vop_stdset_text, 141 .vop_unset_text = vop_stdunset_text, 142 .vop_get_writecount = vop_stdget_writecount, 143 .vop_add_writecount = vop_stdadd_writecount, 144 }; 145 146 /* 147 * Series of placeholder functions for various error returns for 148 * VOPs. 149 */ 150 151 int 152 vop_eopnotsupp(struct vop_generic_args *ap) 153 { 154 /* 155 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 156 */ 157 158 return (EOPNOTSUPP); 159 } 160 161 int 162 vop_ebadf(struct vop_generic_args *ap) 163 { 164 165 return (EBADF); 166 } 167 168 int 169 vop_enotty(struct vop_generic_args *ap) 170 { 171 172 return (ENOTTY); 173 } 174 175 int 176 vop_einval(struct vop_generic_args *ap) 177 { 178 179 return (EINVAL); 180 } 181 182 int 183 vop_enoent(struct vop_generic_args *ap) 184 { 185 186 return (ENOENT); 187 } 188 189 int 190 vop_null(struct vop_generic_args *ap) 191 { 192 193 return (0); 194 } 195 196 /* 197 * Helper function to panic on some bad VOPs in some filesystems. 198 */ 199 int 200 vop_panic(struct vop_generic_args *ap) 201 { 202 203 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 204 } 205 206 /* 207 * vop_std<something> and vop_no<something> are default functions for use by 208 * filesystems that need the "default reasonable" implementation for a 209 * particular operation. 210 * 211 * The documentation for the operations they implement exists (if it exists) 212 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 213 */ 214 215 /* 216 * Default vop for filesystems that do not support name lookup 217 */ 218 static int 219 vop_nolookup(ap) 220 struct vop_lookup_args /* { 221 struct vnode *a_dvp; 222 struct vnode **a_vpp; 223 struct componentname *a_cnp; 224 } */ *ap; 225 { 226 227 *ap->a_vpp = NULL; 228 return (ENOTDIR); 229 } 230 231 /* 232 * vop_norename: 233 * 234 * Handle unlock and reference counting for arguments of vop_rename 235 * for filesystems that do not implement rename operation. 236 */ 237 static int 238 vop_norename(struct vop_rename_args *ap) 239 { 240 241 vop_rename_fail(ap); 242 return (EOPNOTSUPP); 243 } 244 245 /* 246 * vop_nostrategy: 247 * 248 * Strategy routine for VFS devices that have none. 249 * 250 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 251 * routine. Typically this is done for a BIO_READ strategy call. 252 * Typically B_INVAL is assumed to already be clear prior to a write 253 * and should not be cleared manually unless you just made the buffer 254 * invalid. BIO_ERROR should be cleared either way. 255 */ 256 257 static int 258 vop_nostrategy (struct vop_strategy_args *ap) 259 { 260 printf("No strategy for buffer at %p\n", ap->a_bp); 261 vn_printf(ap->a_vp, "vnode "); 262 ap->a_bp->b_ioflags |= BIO_ERROR; 263 ap->a_bp->b_error = EOPNOTSUPP; 264 bufdone(ap->a_bp); 265 return (EOPNOTSUPP); 266 } 267 268 static int 269 get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf, 270 int dirbuflen, off_t *off, char **cpos, int *len, 271 int *eofflag, struct thread *td) 272 { 273 int error, reclen; 274 struct uio uio; 275 struct iovec iov; 276 struct dirent *dp; 277 278 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 279 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 280 281 if (*len == 0) { 282 iov.iov_base = dirbuf; 283 iov.iov_len = dirbuflen; 284 285 uio.uio_iov = &iov; 286 uio.uio_iovcnt = 1; 287 uio.uio_offset = *off; 288 uio.uio_resid = dirbuflen; 289 uio.uio_segflg = UIO_SYSSPACE; 290 uio.uio_rw = UIO_READ; 291 uio.uio_td = td; 292 293 *eofflag = 0; 294 295 #ifdef MAC 296 error = mac_vnode_check_readdir(td->td_ucred, vp); 297 if (error == 0) 298 #endif 299 error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag, 300 NULL, NULL); 301 if (error) 302 return (error); 303 304 *off = uio.uio_offset; 305 306 *cpos = dirbuf; 307 *len = (dirbuflen - uio.uio_resid); 308 309 if (*len == 0) 310 return (ENOENT); 311 } 312 313 dp = (struct dirent *)(*cpos); 314 reclen = dp->d_reclen; 315 *dpp = dp; 316 317 /* check for malformed directory.. */ 318 if (reclen < DIRENT_MINSIZE) 319 return (EINVAL); 320 321 *cpos += reclen; 322 *len -= reclen; 323 324 return (0); 325 } 326 327 /* 328 * Check if a named file exists in a given directory vnode. 329 */ 330 static int 331 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 332 { 333 char *dirbuf, *cpos; 334 int error, eofflag, dirbuflen, len, found; 335 off_t off; 336 struct dirent *dp; 337 struct vattr va; 338 339 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 340 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 341 342 found = 0; 343 344 error = VOP_GETATTR(vp, &va, td->td_ucred); 345 if (error) 346 return (found); 347 348 dirbuflen = DEV_BSIZE; 349 if (dirbuflen < va.va_blocksize) 350 dirbuflen = va.va_blocksize; 351 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 352 353 off = 0; 354 len = 0; 355 do { 356 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off, 357 &cpos, &len, &eofflag, td); 358 if (error) 359 goto out; 360 361 if (dp->d_type != DT_WHT && dp->d_fileno != 0 && 362 strcmp(dp->d_name, dirname) == 0) { 363 found = 1; 364 goto out; 365 } 366 } while (len > 0 || !eofflag); 367 368 out: 369 free(dirbuf, M_TEMP); 370 return (found); 371 } 372 373 int 374 vop_stdaccess(struct vop_access_args *ap) 375 { 376 377 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | 378 VAPPEND)) == 0, ("invalid bit in accmode")); 379 380 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td)); 381 } 382 383 int 384 vop_stdaccessx(struct vop_accessx_args *ap) 385 { 386 int error; 387 accmode_t accmode = ap->a_accmode; 388 389 error = vfs_unixify_accmode(&accmode); 390 if (error != 0) 391 return (error); 392 393 if (accmode == 0) 394 return (0); 395 396 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 397 } 398 399 /* 400 * Advisory record locking support 401 */ 402 int 403 vop_stdadvlock(struct vop_advlock_args *ap) 404 { 405 struct vnode *vp; 406 struct vattr vattr; 407 int error; 408 409 vp = ap->a_vp; 410 if (ap->a_fl->l_whence == SEEK_END) { 411 /* 412 * The NFSv4 server must avoid doing a vn_lock() here, since it 413 * can deadlock the nfsd threads, due to a LOR. Fortunately 414 * the NFSv4 server always uses SEEK_SET and this code is 415 * only required for the SEEK_END case. 416 */ 417 vn_lock(vp, LK_SHARED | LK_RETRY); 418 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 419 VOP_UNLOCK(vp, 0); 420 if (error) 421 return (error); 422 } else 423 vattr.va_size = 0; 424 425 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size)); 426 } 427 428 int 429 vop_stdadvlockasync(struct vop_advlockasync_args *ap) 430 { 431 struct vnode *vp; 432 struct vattr vattr; 433 int error; 434 435 vp = ap->a_vp; 436 if (ap->a_fl->l_whence == SEEK_END) { 437 /* The size argument is only needed for SEEK_END. */ 438 vn_lock(vp, LK_SHARED | LK_RETRY); 439 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 440 VOP_UNLOCK(vp, 0); 441 if (error) 442 return (error); 443 } else 444 vattr.va_size = 0; 445 446 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 447 } 448 449 int 450 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap) 451 { 452 struct vnode *vp; 453 454 vp = ap->a_vp; 455 lf_purgelocks(vp, &vp->v_lockf); 456 return (0); 457 } 458 459 /* 460 * vop_stdpathconf: 461 * 462 * Standard implementation of POSIX pathconf, to get information about limits 463 * for a filesystem. 464 * Override per filesystem for the case where the filesystem has smaller 465 * limits. 466 */ 467 int 468 vop_stdpathconf(ap) 469 struct vop_pathconf_args /* { 470 struct vnode *a_vp; 471 int a_name; 472 int *a_retval; 473 } */ *ap; 474 { 475 476 switch (ap->a_name) { 477 case _PC_ASYNC_IO: 478 *ap->a_retval = _POSIX_ASYNCHRONOUS_IO; 479 return (0); 480 case _PC_NAME_MAX: 481 *ap->a_retval = NAME_MAX; 482 return (0); 483 case _PC_PATH_MAX: 484 *ap->a_retval = PATH_MAX; 485 return (0); 486 case _PC_LINK_MAX: 487 *ap->a_retval = LINK_MAX; 488 return (0); 489 case _PC_MAX_CANON: 490 *ap->a_retval = MAX_CANON; 491 return (0); 492 case _PC_MAX_INPUT: 493 *ap->a_retval = MAX_INPUT; 494 return (0); 495 case _PC_PIPE_BUF: 496 *ap->a_retval = PIPE_BUF; 497 return (0); 498 case _PC_CHOWN_RESTRICTED: 499 *ap->a_retval = 1; 500 return (0); 501 case _PC_VDISABLE: 502 *ap->a_retval = _POSIX_VDISABLE; 503 return (0); 504 default: 505 return (EINVAL); 506 } 507 /* NOTREACHED */ 508 } 509 510 /* 511 * Standard lock, unlock and islocked functions. 512 */ 513 int 514 vop_stdlock(ap) 515 struct vop_lock1_args /* { 516 struct vnode *a_vp; 517 int a_flags; 518 char *file; 519 int line; 520 } */ *ap; 521 { 522 struct vnode *vp = ap->a_vp; 523 struct mtx *ilk; 524 525 ilk = VI_MTX(vp); 526 return (lockmgr_lock_fast_path(vp->v_vnlock, ap->a_flags, 527 (ilk != NULL) ? &ilk->lock_object : NULL, ap->a_file, ap->a_line)); 528 } 529 530 /* See above. */ 531 int 532 vop_stdunlock(ap) 533 struct vop_unlock_args /* { 534 struct vnode *a_vp; 535 int a_flags; 536 } */ *ap; 537 { 538 struct vnode *vp = ap->a_vp; 539 struct mtx *ilk; 540 541 ilk = VI_MTX(vp); 542 return (lockmgr_unlock_fast_path(vp->v_vnlock, ap->a_flags, 543 (ilk != NULL) ? &ilk->lock_object : NULL)); 544 } 545 546 /* See above. */ 547 int 548 vop_stdislocked(ap) 549 struct vop_islocked_args /* { 550 struct vnode *a_vp; 551 } */ *ap; 552 { 553 554 return (lockstatus(ap->a_vp->v_vnlock)); 555 } 556 557 /* 558 * Return true for select/poll. 559 */ 560 int 561 vop_nopoll(ap) 562 struct vop_poll_args /* { 563 struct vnode *a_vp; 564 int a_events; 565 struct ucred *a_cred; 566 struct thread *a_td; 567 } */ *ap; 568 { 569 570 return (poll_no_poll(ap->a_events)); 571 } 572 573 /* 574 * Implement poll for local filesystems that support it. 575 */ 576 int 577 vop_stdpoll(ap) 578 struct vop_poll_args /* { 579 struct vnode *a_vp; 580 int a_events; 581 struct ucred *a_cred; 582 struct thread *a_td; 583 } */ *ap; 584 { 585 if (ap->a_events & ~POLLSTANDARD) 586 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 587 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 588 } 589 590 /* 591 * Return our mount point, as we will take charge of the writes. 592 */ 593 int 594 vop_stdgetwritemount(ap) 595 struct vop_getwritemount_args /* { 596 struct vnode *a_vp; 597 struct mount **a_mpp; 598 } */ *ap; 599 { 600 struct mount *mp; 601 602 /* 603 * XXX Since this is called unlocked we may be recycled while 604 * attempting to ref the mount. If this is the case or mountpoint 605 * will be set to NULL. We only have to prevent this call from 606 * returning with a ref to an incorrect mountpoint. It is not 607 * harmful to return with a ref to our previous mountpoint. 608 */ 609 mp = ap->a_vp->v_mount; 610 if (mp != NULL) { 611 vfs_ref(mp); 612 if (mp != ap->a_vp->v_mount) { 613 vfs_rel(mp); 614 mp = NULL; 615 } 616 } 617 *(ap->a_mpp) = mp; 618 return (0); 619 } 620 621 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 622 int 623 vop_stdbmap(ap) 624 struct vop_bmap_args /* { 625 struct vnode *a_vp; 626 daddr_t a_bn; 627 struct bufobj **a_bop; 628 daddr_t *a_bnp; 629 int *a_runp; 630 int *a_runb; 631 } */ *ap; 632 { 633 634 if (ap->a_bop != NULL) 635 *ap->a_bop = &ap->a_vp->v_bufobj; 636 if (ap->a_bnp != NULL) 637 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 638 if (ap->a_runp != NULL) 639 *ap->a_runp = 0; 640 if (ap->a_runb != NULL) 641 *ap->a_runb = 0; 642 return (0); 643 } 644 645 int 646 vop_stdfsync(ap) 647 struct vop_fsync_args /* { 648 struct vnode *a_vp; 649 int a_waitfor; 650 struct thread *a_td; 651 } */ *ap; 652 { 653 struct vnode *vp = ap->a_vp; 654 struct buf *bp; 655 struct bufobj *bo; 656 struct buf *nbp; 657 int error = 0; 658 int maxretry = 1000; /* large, arbitrarily chosen */ 659 660 bo = &vp->v_bufobj; 661 BO_LOCK(bo); 662 loop1: 663 /* 664 * MARK/SCAN initialization to avoid infinite loops. 665 */ 666 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 667 bp->b_vflags &= ~BV_SCANNED; 668 bp->b_error = 0; 669 } 670 671 /* 672 * Flush all dirty buffers associated with a vnode. 673 */ 674 loop2: 675 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 676 if ((bp->b_vflags & BV_SCANNED) != 0) 677 continue; 678 bp->b_vflags |= BV_SCANNED; 679 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 680 if (ap->a_waitfor != MNT_WAIT) 681 continue; 682 if (BUF_LOCK(bp, 683 LK_EXCLUSIVE | LK_INTERLOCK | LK_SLEEPFAIL, 684 BO_LOCKPTR(bo)) != 0) { 685 BO_LOCK(bo); 686 goto loop1; 687 } 688 BO_LOCK(bo); 689 } 690 BO_UNLOCK(bo); 691 KASSERT(bp->b_bufobj == bo, 692 ("bp %p wrong b_bufobj %p should be %p", 693 bp, bp->b_bufobj, bo)); 694 if ((bp->b_flags & B_DELWRI) == 0) 695 panic("fsync: not dirty"); 696 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 697 vfs_bio_awrite(bp); 698 } else { 699 bremfree(bp); 700 bawrite(bp); 701 } 702 BO_LOCK(bo); 703 goto loop2; 704 } 705 706 /* 707 * If synchronous the caller expects us to completely resolve all 708 * dirty buffers in the system. Wait for in-progress I/O to 709 * complete (which could include background bitmap writes), then 710 * retry if dirty blocks still exist. 711 */ 712 if (ap->a_waitfor == MNT_WAIT) { 713 bufobj_wwait(bo, 0, 0); 714 if (bo->bo_dirty.bv_cnt > 0) { 715 /* 716 * If we are unable to write any of these buffers 717 * then we fail now rather than trying endlessly 718 * to write them out. 719 */ 720 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 721 if ((error = bp->b_error) == 0) 722 continue; 723 if (error == 0 && --maxretry >= 0) 724 goto loop1; 725 error = EAGAIN; 726 } 727 } 728 BO_UNLOCK(bo); 729 if (error == EAGAIN) 730 vn_printf(vp, "fsync: giving up on dirty "); 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 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 * Deactivate pages in the specified range from the backing VM 1096 * object. Pages that are resident in the buffer cache will 1097 * remain wired until their corresponding buffers are released 1098 * below. 1099 */ 1100 if (vp->v_object != NULL) { 1101 start = trunc_page(ap->a_start); 1102 end = round_page(ap->a_end); 1103 VM_OBJECT_RLOCK(vp->v_object); 1104 vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start), 1105 OFF_TO_IDX(end)); 1106 VM_OBJECT_RUNLOCK(vp->v_object); 1107 } 1108 1109 bo = &vp->v_bufobj; 1110 BO_RLOCK(bo); 1111 bsize = vp->v_bufobj.bo_bsize; 1112 startn = ap->a_start / bsize; 1113 endn = ap->a_end / bsize; 1114 error = bnoreuselist(&bo->bo_clean, bo, startn, endn); 1115 if (error == 0) 1116 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn); 1117 BO_RUNLOCK(bo); 1118 VOP_UNLOCK(vp, 0); 1119 break; 1120 default: 1121 error = EINVAL; 1122 break; 1123 } 1124 return (error); 1125 } 1126 1127 int 1128 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1129 { 1130 1131 ap->a_vp->v_socket = ap->a_socket; 1132 return (0); 1133 } 1134 1135 int 1136 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1137 { 1138 1139 *ap->a_socket = ap->a_vp->v_socket; 1140 return (0); 1141 } 1142 1143 int 1144 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1145 { 1146 1147 ap->a_vp->v_socket = NULL; 1148 return (0); 1149 } 1150 1151 static int 1152 vop_stdis_text(struct vop_is_text_args *ap) 1153 { 1154 1155 return ((ap->a_vp->v_vflag & VV_TEXT) != 0); 1156 } 1157 1158 static int 1159 vop_stdset_text(struct vop_set_text_args *ap) 1160 { 1161 1162 ap->a_vp->v_vflag |= VV_TEXT; 1163 return (0); 1164 } 1165 1166 static int 1167 vop_stdunset_text(struct vop_unset_text_args *ap) 1168 { 1169 1170 ap->a_vp->v_vflag &= ~VV_TEXT; 1171 return (0); 1172 } 1173 1174 static int 1175 vop_stdget_writecount(struct vop_get_writecount_args *ap) 1176 { 1177 1178 *ap->a_writecount = ap->a_vp->v_writecount; 1179 return (0); 1180 } 1181 1182 static int 1183 vop_stdadd_writecount(struct vop_add_writecount_args *ap) 1184 { 1185 1186 ap->a_vp->v_writecount += ap->a_inc; 1187 return (0); 1188 } 1189 1190 /* 1191 * vfs default ops 1192 * used to fill the vfs function table to get reasonable default return values. 1193 */ 1194 int 1195 vfs_stdroot (mp, flags, vpp) 1196 struct mount *mp; 1197 int flags; 1198 struct vnode **vpp; 1199 { 1200 1201 return (EOPNOTSUPP); 1202 } 1203 1204 int 1205 vfs_stdstatfs (mp, sbp) 1206 struct mount *mp; 1207 struct statfs *sbp; 1208 { 1209 1210 return (EOPNOTSUPP); 1211 } 1212 1213 int 1214 vfs_stdquotactl (mp, cmds, uid, arg) 1215 struct mount *mp; 1216 int cmds; 1217 uid_t uid; 1218 void *arg; 1219 { 1220 1221 return (EOPNOTSUPP); 1222 } 1223 1224 int 1225 vfs_stdsync(mp, waitfor) 1226 struct mount *mp; 1227 int waitfor; 1228 { 1229 struct vnode *vp, *mvp; 1230 struct thread *td; 1231 int error, lockreq, allerror = 0; 1232 1233 td = curthread; 1234 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1235 if (waitfor != MNT_WAIT) 1236 lockreq |= LK_NOWAIT; 1237 /* 1238 * Force stale buffer cache information to be flushed. 1239 */ 1240 loop: 1241 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1242 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1243 VI_UNLOCK(vp); 1244 continue; 1245 } 1246 if ((error = vget(vp, lockreq, td)) != 0) { 1247 if (error == ENOENT) { 1248 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1249 goto loop; 1250 } 1251 continue; 1252 } 1253 error = VOP_FSYNC(vp, waitfor, td); 1254 if (error) 1255 allerror = error; 1256 vput(vp); 1257 } 1258 return (allerror); 1259 } 1260 1261 int 1262 vfs_stdnosync (mp, waitfor) 1263 struct mount *mp; 1264 int waitfor; 1265 { 1266 1267 return (0); 1268 } 1269 1270 int 1271 vfs_stdvget (mp, ino, flags, vpp) 1272 struct mount *mp; 1273 ino_t ino; 1274 int flags; 1275 struct vnode **vpp; 1276 { 1277 1278 return (EOPNOTSUPP); 1279 } 1280 1281 int 1282 vfs_stdfhtovp (mp, fhp, flags, vpp) 1283 struct mount *mp; 1284 struct fid *fhp; 1285 int flags; 1286 struct vnode **vpp; 1287 { 1288 1289 return (EOPNOTSUPP); 1290 } 1291 1292 int 1293 vfs_stdinit (vfsp) 1294 struct vfsconf *vfsp; 1295 { 1296 1297 return (0); 1298 } 1299 1300 int 1301 vfs_stduninit (vfsp) 1302 struct vfsconf *vfsp; 1303 { 1304 1305 return(0); 1306 } 1307 1308 int 1309 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 1310 struct mount *mp; 1311 int cmd; 1312 struct vnode *filename_vp; 1313 int attrnamespace; 1314 const char *attrname; 1315 { 1316 1317 if (filename_vp != NULL) 1318 VOP_UNLOCK(filename_vp, 0); 1319 return (EOPNOTSUPP); 1320 } 1321 1322 int 1323 vfs_stdsysctl(mp, op, req) 1324 struct mount *mp; 1325 fsctlop_t op; 1326 struct sysctl_req *req; 1327 { 1328 1329 return (EOPNOTSUPP); 1330 } 1331 1332 /* end of vfs default ops */
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