Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
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/9.1/sys/kern/vfs_default.c 237351 2012-06-21 03:58:10Z mckusick $"); 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/mutex.h> 51 #include <sys/namei.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 /* 82 * This vnode table stores what we want to do if the filesystem doesn't 83 * implement a particular VOP. 84 * 85 * If there is no specific entry here, we will return EOPNOTSUPP. 86 * 87 * Note that every filesystem has to implement either vop_access 88 * or vop_accessx; failing to do so will result in immediate crash 89 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(), 90 * which calls vop_stdaccess() etc. 91 */ 92 93 struct vop_vector default_vnodeops = { 94 .vop_default = NULL, 95 .vop_bypass = VOP_EOPNOTSUPP, 96 97 .vop_access = vop_stdaccess, 98 .vop_accessx = vop_stdaccessx, 99 .vop_advise = vop_stdadvise, 100 .vop_advlock = vop_stdadvlock, 101 .vop_advlockasync = vop_stdadvlockasync, 102 .vop_advlockpurge = vop_stdadvlockpurge, 103 .vop_allocate = vop_stdallocate, 104 .vop_bmap = vop_stdbmap, 105 .vop_close = VOP_NULL, 106 .vop_fsync = VOP_NULL, 107 .vop_getpages = vop_stdgetpages, 108 .vop_getwritemount = vop_stdgetwritemount, 109 .vop_inactive = VOP_NULL, 110 .vop_ioctl = VOP_ENOTTY, 111 .vop_kqfilter = vop_stdkqfilter, 112 .vop_islocked = vop_stdislocked, 113 .vop_lock1 = vop_stdlock, 114 .vop_lookup = vop_nolookup, 115 .vop_open = VOP_NULL, 116 .vop_pathconf = VOP_EINVAL, 117 .vop_poll = vop_nopoll, 118 .vop_putpages = vop_stdputpages, 119 .vop_readlink = VOP_EINVAL, 120 .vop_rename = vop_norename, 121 .vop_revoke = VOP_PANIC, 122 .vop_strategy = vop_nostrategy, 123 .vop_unlock = vop_stdunlock, 124 .vop_vptocnp = vop_stdvptocnp, 125 .vop_vptofh = vop_stdvptofh, 126 .vop_unp_bind = vop_stdunp_bind, 127 .vop_unp_connect = vop_stdunp_connect, 128 .vop_unp_detach = vop_stdunp_detach, 129 }; 130 131 /* 132 * Series of placeholder functions for various error returns for 133 * VOPs. 134 */ 135 136 int 137 vop_eopnotsupp(struct vop_generic_args *ap) 138 { 139 /* 140 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 141 */ 142 143 return (EOPNOTSUPP); 144 } 145 146 int 147 vop_ebadf(struct vop_generic_args *ap) 148 { 149 150 return (EBADF); 151 } 152 153 int 154 vop_enotty(struct vop_generic_args *ap) 155 { 156 157 return (ENOTTY); 158 } 159 160 int 161 vop_einval(struct vop_generic_args *ap) 162 { 163 164 return (EINVAL); 165 } 166 167 int 168 vop_enoent(struct vop_generic_args *ap) 169 { 170 171 return (ENOENT); 172 } 173 174 int 175 vop_null(struct vop_generic_args *ap) 176 { 177 178 return (0); 179 } 180 181 /* 182 * Helper function to panic on some bad VOPs in some filesystems. 183 */ 184 int 185 vop_panic(struct vop_generic_args *ap) 186 { 187 188 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 189 } 190 191 /* 192 * vop_std<something> and vop_no<something> are default functions for use by 193 * filesystems that need the "default reasonable" implementation for a 194 * particular operation. 195 * 196 * The documentation for the operations they implement exists (if it exists) 197 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 198 */ 199 200 /* 201 * Default vop for filesystems that do not support name lookup 202 */ 203 static int 204 vop_nolookup(ap) 205 struct vop_lookup_args /* { 206 struct vnode *a_dvp; 207 struct vnode **a_vpp; 208 struct componentname *a_cnp; 209 } */ *ap; 210 { 211 212 *ap->a_vpp = NULL; 213 return (ENOTDIR); 214 } 215 216 /* 217 * vop_norename: 218 * 219 * Handle unlock and reference counting for arguments of vop_rename 220 * for filesystems that do not implement rename operation. 221 */ 222 static int 223 vop_norename(struct vop_rename_args *ap) 224 { 225 226 vop_rename_fail(ap); 227 return (EOPNOTSUPP); 228 } 229 230 /* 231 * vop_nostrategy: 232 * 233 * Strategy routine for VFS devices that have none. 234 * 235 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 236 * routine. Typically this is done for a BIO_READ strategy call. 237 * Typically B_INVAL is assumed to already be clear prior to a write 238 * and should not be cleared manually unless you just made the buffer 239 * invalid. BIO_ERROR should be cleared either way. 240 */ 241 242 static int 243 vop_nostrategy (struct vop_strategy_args *ap) 244 { 245 printf("No strategy for buffer at %p\n", ap->a_bp); 246 vprint("vnode", ap->a_vp); 247 ap->a_bp->b_ioflags |= BIO_ERROR; 248 ap->a_bp->b_error = EOPNOTSUPP; 249 bufdone(ap->a_bp); 250 return (EOPNOTSUPP); 251 } 252 253 static int 254 get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf, 255 int dirbuflen, off_t *off, char **cpos, int *len, 256 int *eofflag, struct thread *td) 257 { 258 int error, reclen; 259 struct uio uio; 260 struct iovec iov; 261 struct dirent *dp; 262 263 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 264 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 265 266 if (*len == 0) { 267 iov.iov_base = dirbuf; 268 iov.iov_len = dirbuflen; 269 270 uio.uio_iov = &iov; 271 uio.uio_iovcnt = 1; 272 uio.uio_offset = *off; 273 uio.uio_resid = dirbuflen; 274 uio.uio_segflg = UIO_SYSSPACE; 275 uio.uio_rw = UIO_READ; 276 uio.uio_td = td; 277 278 *eofflag = 0; 279 280 #ifdef MAC 281 error = mac_vnode_check_readdir(td->td_ucred, vp); 282 if (error == 0) 283 #endif 284 error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag, 285 NULL, NULL); 286 if (error) 287 return (error); 288 289 *off = uio.uio_offset; 290 291 *cpos = dirbuf; 292 *len = (dirbuflen - uio.uio_resid); 293 294 if (*len == 0) 295 return (ENOENT); 296 } 297 298 dp = (struct dirent *)(*cpos); 299 reclen = dp->d_reclen; 300 *dpp = dp; 301 302 /* check for malformed directory.. */ 303 if (reclen < DIRENT_MINSIZE) 304 return (EINVAL); 305 306 *cpos += reclen; 307 *len -= reclen; 308 309 return (0); 310 } 311 312 /* 313 * Check if a named file exists in a given directory vnode. 314 */ 315 static int 316 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 317 { 318 char *dirbuf, *cpos; 319 int error, eofflag, dirbuflen, len, found; 320 off_t off; 321 struct dirent *dp; 322 struct vattr va; 323 324 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 325 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 326 327 found = 0; 328 329 error = VOP_GETATTR(vp, &va, td->td_ucred); 330 if (error) 331 return (found); 332 333 dirbuflen = DEV_BSIZE; 334 if (dirbuflen < va.va_blocksize) 335 dirbuflen = va.va_blocksize; 336 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 337 338 off = 0; 339 len = 0; 340 do { 341 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off, 342 &cpos, &len, &eofflag, td); 343 if (error) 344 goto out; 345 346 if ((dp->d_type != DT_WHT) && 347 !strcmp(dp->d_name, dirname)) { 348 found = 1; 349 goto out; 350 } 351 } while (len > 0 || !eofflag); 352 353 out: 354 free(dirbuf, M_TEMP); 355 return (found); 356 } 357 358 int 359 vop_stdaccess(struct vop_access_args *ap) 360 { 361 362 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | 363 VAPPEND)) == 0, ("invalid bit in accmode")); 364 365 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td)); 366 } 367 368 int 369 vop_stdaccessx(struct vop_accessx_args *ap) 370 { 371 int error; 372 accmode_t accmode = ap->a_accmode; 373 374 error = vfs_unixify_accmode(&accmode); 375 if (error != 0) 376 return (error); 377 378 if (accmode == 0) 379 return (0); 380 381 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 382 } 383 384 /* 385 * Advisory record locking support 386 */ 387 int 388 vop_stdadvlock(struct vop_advlock_args *ap) 389 { 390 struct vnode *vp; 391 struct ucred *cred; 392 struct vattr vattr; 393 int error; 394 395 vp = ap->a_vp; 396 cred = curthread->td_ucred; 397 vn_lock(vp, LK_SHARED | LK_RETRY); 398 error = VOP_GETATTR(vp, &vattr, cred); 399 VOP_UNLOCK(vp, 0); 400 if (error) 401 return (error); 402 403 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size)); 404 } 405 406 int 407 vop_stdadvlockasync(struct vop_advlockasync_args *ap) 408 { 409 struct vnode *vp; 410 struct ucred *cred; 411 struct vattr vattr; 412 int error; 413 414 vp = ap->a_vp; 415 cred = curthread->td_ucred; 416 vn_lock(vp, LK_SHARED | LK_RETRY); 417 error = VOP_GETATTR(vp, &vattr, cred); 418 VOP_UNLOCK(vp, 0); 419 if (error) 420 return (error); 421 422 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 423 } 424 425 int 426 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap) 427 { 428 struct vnode *vp; 429 430 vp = ap->a_vp; 431 lf_purgelocks(vp, &vp->v_lockf); 432 return (0); 433 } 434 435 /* 436 * vop_stdpathconf: 437 * 438 * Standard implementation of POSIX pathconf, to get information about limits 439 * for a filesystem. 440 * Override per filesystem for the case where the filesystem has smaller 441 * limits. 442 */ 443 int 444 vop_stdpathconf(ap) 445 struct vop_pathconf_args /* { 446 struct vnode *a_vp; 447 int a_name; 448 int *a_retval; 449 } */ *ap; 450 { 451 452 switch (ap->a_name) { 453 case _PC_NAME_MAX: 454 *ap->a_retval = NAME_MAX; 455 return (0); 456 case _PC_PATH_MAX: 457 *ap->a_retval = PATH_MAX; 458 return (0); 459 case _PC_LINK_MAX: 460 *ap->a_retval = LINK_MAX; 461 return (0); 462 case _PC_MAX_CANON: 463 *ap->a_retval = MAX_CANON; 464 return (0); 465 case _PC_MAX_INPUT: 466 *ap->a_retval = MAX_INPUT; 467 return (0); 468 case _PC_PIPE_BUF: 469 *ap->a_retval = PIPE_BUF; 470 return (0); 471 case _PC_CHOWN_RESTRICTED: 472 *ap->a_retval = 1; 473 return (0); 474 case _PC_VDISABLE: 475 *ap->a_retval = _POSIX_VDISABLE; 476 return (0); 477 default: 478 return (EINVAL); 479 } 480 /* NOTREACHED */ 481 } 482 483 /* 484 * Standard lock, unlock and islocked functions. 485 */ 486 int 487 vop_stdlock(ap) 488 struct vop_lock1_args /* { 489 struct vnode *a_vp; 490 int a_flags; 491 char *file; 492 int line; 493 } */ *ap; 494 { 495 struct vnode *vp = ap->a_vp; 496 497 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp), 498 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file, 499 ap->a_line)); 500 } 501 502 /* See above. */ 503 int 504 vop_stdunlock(ap) 505 struct vop_unlock_args /* { 506 struct vnode *a_vp; 507 int a_flags; 508 } */ *ap; 509 { 510 struct vnode *vp = ap->a_vp; 511 512 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp))); 513 } 514 515 /* See above. */ 516 int 517 vop_stdislocked(ap) 518 struct vop_islocked_args /* { 519 struct vnode *a_vp; 520 } */ *ap; 521 { 522 523 return (lockstatus(ap->a_vp->v_vnlock)); 524 } 525 526 /* 527 * Return true for select/poll. 528 */ 529 int 530 vop_nopoll(ap) 531 struct vop_poll_args /* { 532 struct vnode *a_vp; 533 int a_events; 534 struct ucred *a_cred; 535 struct thread *a_td; 536 } */ *ap; 537 { 538 539 return (poll_no_poll(ap->a_events)); 540 } 541 542 /* 543 * Implement poll for local filesystems that support it. 544 */ 545 int 546 vop_stdpoll(ap) 547 struct vop_poll_args /* { 548 struct vnode *a_vp; 549 int a_events; 550 struct ucred *a_cred; 551 struct thread *a_td; 552 } */ *ap; 553 { 554 if (ap->a_events & ~POLLSTANDARD) 555 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 556 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 557 } 558 559 /* 560 * Return our mount point, as we will take charge of the writes. 561 */ 562 int 563 vop_stdgetwritemount(ap) 564 struct vop_getwritemount_args /* { 565 struct vnode *a_vp; 566 struct mount **a_mpp; 567 } */ *ap; 568 { 569 struct mount *mp; 570 571 /* 572 * XXX Since this is called unlocked we may be recycled while 573 * attempting to ref the mount. If this is the case or mountpoint 574 * will be set to NULL. We only have to prevent this call from 575 * returning with a ref to an incorrect mountpoint. It is not 576 * harmful to return with a ref to our previous mountpoint. 577 */ 578 mp = ap->a_vp->v_mount; 579 if (mp != NULL) { 580 vfs_ref(mp); 581 if (mp != ap->a_vp->v_mount) { 582 vfs_rel(mp); 583 mp = NULL; 584 } 585 } 586 *(ap->a_mpp) = mp; 587 return (0); 588 } 589 590 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 591 int 592 vop_stdbmap(ap) 593 struct vop_bmap_args /* { 594 struct vnode *a_vp; 595 daddr_t a_bn; 596 struct bufobj **a_bop; 597 daddr_t *a_bnp; 598 int *a_runp; 599 int *a_runb; 600 } */ *ap; 601 { 602 603 if (ap->a_bop != NULL) 604 *ap->a_bop = &ap->a_vp->v_bufobj; 605 if (ap->a_bnp != NULL) 606 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 607 if (ap->a_runp != NULL) 608 *ap->a_runp = 0; 609 if (ap->a_runb != NULL) 610 *ap->a_runb = 0; 611 return (0); 612 } 613 614 int 615 vop_stdfsync(ap) 616 struct vop_fsync_args /* { 617 struct vnode *a_vp; 618 struct ucred *a_cred; 619 int a_waitfor; 620 struct thread *a_td; 621 } */ *ap; 622 { 623 struct vnode *vp = ap->a_vp; 624 struct buf *bp; 625 struct bufobj *bo; 626 struct buf *nbp; 627 int error = 0; 628 int maxretry = 1000; /* large, arbitrarily chosen */ 629 630 bo = &vp->v_bufobj; 631 BO_LOCK(bo); 632 loop1: 633 /* 634 * MARK/SCAN initialization to avoid infinite loops. 635 */ 636 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 637 bp->b_vflags &= ~BV_SCANNED; 638 bp->b_error = 0; 639 } 640 641 /* 642 * Flush all dirty buffers associated with a vnode. 643 */ 644 loop2: 645 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 646 if ((bp->b_vflags & BV_SCANNED) != 0) 647 continue; 648 bp->b_vflags |= BV_SCANNED; 649 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 650 if (ap->a_waitfor != MNT_WAIT) 651 continue; 652 if (BUF_LOCK(bp, 653 LK_EXCLUSIVE | LK_INTERLOCK | LK_SLEEPFAIL, 654 BO_MTX(bo)) != 0) { 655 BO_LOCK(bo); 656 goto loop1; 657 } 658 BO_LOCK(bo); 659 } 660 BO_UNLOCK(bo); 661 KASSERT(bp->b_bufobj == bo, 662 ("bp %p wrong b_bufobj %p should be %p", 663 bp, bp->b_bufobj, bo)); 664 if ((bp->b_flags & B_DELWRI) == 0) 665 panic("fsync: not dirty"); 666 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 667 vfs_bio_awrite(bp); 668 } else { 669 bremfree(bp); 670 bawrite(bp); 671 } 672 BO_LOCK(bo); 673 goto loop2; 674 } 675 676 /* 677 * If synchronous the caller expects us to completely resolve all 678 * dirty buffers in the system. Wait for in-progress I/O to 679 * complete (which could include background bitmap writes), then 680 * retry if dirty blocks still exist. 681 */ 682 if (ap->a_waitfor == MNT_WAIT) { 683 bufobj_wwait(bo, 0, 0); 684 if (bo->bo_dirty.bv_cnt > 0) { 685 /* 686 * If we are unable to write any of these buffers 687 * then we fail now rather than trying endlessly 688 * to write them out. 689 */ 690 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 691 if ((error = bp->b_error) == 0) 692 continue; 693 if (error == 0 && --maxretry >= 0) 694 goto loop1; 695 error = EAGAIN; 696 } 697 } 698 BO_UNLOCK(bo); 699 if (error == EAGAIN) 700 vprint("fsync: giving up on dirty", vp); 701 702 return (error); 703 } 704 705 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 706 int 707 vop_stdgetpages(ap) 708 struct vop_getpages_args /* { 709 struct vnode *a_vp; 710 vm_page_t *a_m; 711 int a_count; 712 int a_reqpage; 713 vm_ooffset_t a_offset; 714 } */ *ap; 715 { 716 717 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 718 ap->a_count, ap->a_reqpage); 719 } 720 721 int 722 vop_stdkqfilter(struct vop_kqfilter_args *ap) 723 { 724 return vfs_kqfilter(ap); 725 } 726 727 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 728 int 729 vop_stdputpages(ap) 730 struct vop_putpages_args /* { 731 struct vnode *a_vp; 732 vm_page_t *a_m; 733 int a_count; 734 int a_sync; 735 int *a_rtvals; 736 vm_ooffset_t a_offset; 737 } */ *ap; 738 { 739 740 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 741 ap->a_sync, ap->a_rtvals); 742 } 743 744 int 745 vop_stdvptofh(struct vop_vptofh_args *ap) 746 { 747 return (EOPNOTSUPP); 748 } 749 750 int 751 vop_stdvptocnp(struct vop_vptocnp_args *ap) 752 { 753 struct vnode *vp = ap->a_vp; 754 struct vnode **dvp = ap->a_vpp; 755 struct ucred *cred = ap->a_cred; 756 char *buf = ap->a_buf; 757 int *buflen = ap->a_buflen; 758 char *dirbuf, *cpos; 759 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 760 off_t off; 761 ino_t fileno; 762 struct vattr va; 763 struct nameidata nd; 764 struct thread *td; 765 struct dirent *dp; 766 struct vnode *mvp; 767 768 i = *buflen; 769 error = 0; 770 covered = 0; 771 td = curthread; 772 773 if (vp->v_type != VDIR) 774 return (ENOENT); 775 776 error = VOP_GETATTR(vp, &va, cred); 777 if (error) 778 return (error); 779 780 VREF(vp); 781 locked = VOP_ISLOCKED(vp); 782 VOP_UNLOCK(vp, 0); 783 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 784 "..", vp, td); 785 flags = FREAD; 786 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 787 if (error) { 788 vn_lock(vp, locked | LK_RETRY); 789 return (error); 790 } 791 NDFREE(&nd, NDF_ONLY_PNBUF); 792 793 mvp = *dvp = nd.ni_vp; 794 795 if (vp->v_mount != (*dvp)->v_mount && 796 ((*dvp)->v_vflag & VV_ROOT) && 797 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 798 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 799 VREF(mvp); 800 VOP_UNLOCK(mvp, 0); 801 vn_close(mvp, FREAD, cred, td); 802 VREF(*dvp); 803 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 804 covered = 1; 805 } 806 807 fileno = va.va_fileid; 808 809 dirbuflen = DEV_BSIZE; 810 if (dirbuflen < va.va_blocksize) 811 dirbuflen = va.va_blocksize; 812 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 813 814 if ((*dvp)->v_type != VDIR) { 815 error = ENOENT; 816 goto out; 817 } 818 819 off = 0; 820 len = 0; 821 do { 822 /* call VOP_READDIR of parent */ 823 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 824 &cpos, &len, &eofflag, td); 825 if (error) 826 goto out; 827 828 if ((dp->d_type != DT_WHT) && 829 (dp->d_fileno == fileno)) { 830 if (covered) { 831 VOP_UNLOCK(*dvp, 0); 832 vn_lock(mvp, LK_EXCLUSIVE | LK_RETRY); 833 if (dirent_exists(mvp, dp->d_name, td)) { 834 error = ENOENT; 835 VOP_UNLOCK(mvp, 0); 836 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 837 goto out; 838 } 839 VOP_UNLOCK(mvp, 0); 840 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 841 } 842 i -= dp->d_namlen; 843 844 if (i < 0) { 845 error = ENOMEM; 846 goto out; 847 } 848 bcopy(dp->d_name, buf + i, dp->d_namlen); 849 error = 0; 850 goto out; 851 } 852 } while (len > 0 || !eofflag); 853 error = ENOENT; 854 855 out: 856 free(dirbuf, M_TEMP); 857 if (!error) { 858 *buflen = i; 859 vref(*dvp); 860 } 861 if (covered) { 862 vput(*dvp); 863 vrele(mvp); 864 } else { 865 VOP_UNLOCK(mvp, 0); 866 vn_close(mvp, FREAD, cred, td); 867 } 868 vn_lock(vp, locked | LK_RETRY); 869 return (error); 870 } 871 872 int 873 vop_stdallocate(struct vop_allocate_args *ap) 874 { 875 #ifdef __notyet__ 876 struct statfs sfs; 877 #endif 878 struct iovec aiov; 879 struct vattr vattr, *vap; 880 struct uio auio; 881 off_t fsize, len, cur, offset; 882 uint8_t *buf; 883 struct thread *td; 884 struct vnode *vp; 885 size_t iosize; 886 int error; 887 888 buf = NULL; 889 error = 0; 890 td = curthread; 891 vap = &vattr; 892 vp = ap->a_vp; 893 len = *ap->a_len; 894 offset = *ap->a_offset; 895 896 error = VOP_GETATTR(vp, vap, td->td_ucred); 897 if (error != 0) 898 goto out; 899 fsize = vap->va_size; 900 iosize = vap->va_blocksize; 901 if (iosize == 0) 902 iosize = BLKDEV_IOSIZE; 903 if (iosize > MAXPHYS) 904 iosize = MAXPHYS; 905 buf = malloc(iosize, M_TEMP, M_WAITOK); 906 907 #ifdef __notyet__ 908 /* 909 * Check if the filesystem sets f_maxfilesize; if not use 910 * VOP_SETATTR to perform the check. 911 */ 912 error = VFS_STATFS(vp->v_mount, &sfs, td); 913 if (error != 0) 914 goto out; 915 if (sfs.f_maxfilesize) { 916 if (offset > sfs.f_maxfilesize || len > sfs.f_maxfilesize || 917 offset + len > sfs.f_maxfilesize) { 918 error = EFBIG; 919 goto out; 920 } 921 } else 922 #endif 923 if (offset + len > vap->va_size) { 924 /* 925 * Test offset + len against the filesystem's maxfilesize. 926 */ 927 VATTR_NULL(vap); 928 vap->va_size = offset + len; 929 error = VOP_SETATTR(vp, vap, td->td_ucred); 930 if (error != 0) 931 goto out; 932 VATTR_NULL(vap); 933 vap->va_size = fsize; 934 error = VOP_SETATTR(vp, vap, td->td_ucred); 935 if (error != 0) 936 goto out; 937 } 938 939 for (;;) { 940 /* 941 * Read and write back anything below the nominal file 942 * size. There's currently no way outside the filesystem 943 * to know whether this area is sparse or not. 944 */ 945 cur = iosize; 946 if ((offset % iosize) != 0) 947 cur -= (offset % iosize); 948 if (cur > len) 949 cur = len; 950 if (offset < fsize) { 951 aiov.iov_base = buf; 952 aiov.iov_len = cur; 953 auio.uio_iov = &aiov; 954 auio.uio_iovcnt = 1; 955 auio.uio_offset = offset; 956 auio.uio_resid = cur; 957 auio.uio_segflg = UIO_SYSSPACE; 958 auio.uio_rw = UIO_READ; 959 auio.uio_td = td; 960 error = VOP_READ(vp, &auio, 0, td->td_ucred); 961 if (error != 0) 962 break; 963 if (auio.uio_resid > 0) { 964 bzero(buf + cur - auio.uio_resid, 965 auio.uio_resid); 966 } 967 } else { 968 bzero(buf, cur); 969 } 970 971 aiov.iov_base = buf; 972 aiov.iov_len = cur; 973 auio.uio_iov = &aiov; 974 auio.uio_iovcnt = 1; 975 auio.uio_offset = offset; 976 auio.uio_resid = cur; 977 auio.uio_segflg = UIO_SYSSPACE; 978 auio.uio_rw = UIO_WRITE; 979 auio.uio_td = td; 980 981 error = VOP_WRITE(vp, &auio, 0, td->td_ucred); 982 if (error != 0) 983 break; 984 985 len -= cur; 986 offset += cur; 987 if (len == 0) 988 break; 989 if (should_yield()) 990 break; 991 } 992 993 out: 994 *ap->a_len = len; 995 *ap->a_offset = offset; 996 free(buf, M_TEMP); 997 return (error); 998 } 999 1000 int 1001 vop_stdadvise(struct vop_advise_args *ap) 1002 { 1003 struct vnode *vp; 1004 off_t start, end; 1005 int error, vfslocked; 1006 1007 vp = ap->a_vp; 1008 switch (ap->a_advice) { 1009 case POSIX_FADV_WILLNEED: 1010 /* 1011 * Do nothing for now. Filesystems should provide a 1012 * custom method which starts an asynchronous read of 1013 * the requested region. 1014 */ 1015 error = 0; 1016 break; 1017 case POSIX_FADV_DONTNEED: 1018 /* 1019 * Flush any open FS buffers and then remove pages 1020 * from the backing VM object. Using vinvalbuf() here 1021 * is a bit heavy-handed as it flushes all buffers for 1022 * the given vnode, not just the buffers covering the 1023 * requested range. 1024 */ 1025 error = 0; 1026 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 1027 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1028 if (vp->v_iflag & VI_DOOMED) { 1029 VOP_UNLOCK(vp, 0); 1030 VFS_UNLOCK_GIANT(vfslocked); 1031 break; 1032 } 1033 vinvalbuf(vp, V_CLEANONLY, 0, 0); 1034 if (vp->v_object != NULL) { 1035 start = trunc_page(ap->a_start); 1036 end = round_page(ap->a_end); 1037 VM_OBJECT_LOCK(vp->v_object); 1038 vm_object_page_cache(vp->v_object, OFF_TO_IDX(start), 1039 OFF_TO_IDX(end)); 1040 VM_OBJECT_UNLOCK(vp->v_object); 1041 } 1042 VOP_UNLOCK(vp, 0); 1043 VFS_UNLOCK_GIANT(vfslocked); 1044 break; 1045 default: 1046 error = EINVAL; 1047 break; 1048 } 1049 return (error); 1050 } 1051 1052 int 1053 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1054 { 1055 1056 ap->a_vp->v_socket = ap->a_socket; 1057 return (0); 1058 } 1059 1060 int 1061 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1062 { 1063 1064 *ap->a_socket = ap->a_vp->v_socket; 1065 return (0); 1066 } 1067 1068 int 1069 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1070 { 1071 1072 ap->a_vp->v_socket = NULL; 1073 return (0); 1074 } 1075 1076 /* 1077 * vfs default ops 1078 * used to fill the vfs function table to get reasonable default return values. 1079 */ 1080 int 1081 vfs_stdroot (mp, flags, vpp) 1082 struct mount *mp; 1083 int flags; 1084 struct vnode **vpp; 1085 { 1086 1087 return (EOPNOTSUPP); 1088 } 1089 1090 int 1091 vfs_stdstatfs (mp, sbp) 1092 struct mount *mp; 1093 struct statfs *sbp; 1094 { 1095 1096 return (EOPNOTSUPP); 1097 } 1098 1099 int 1100 vfs_stdquotactl (mp, cmds, uid, arg) 1101 struct mount *mp; 1102 int cmds; 1103 uid_t uid; 1104 void *arg; 1105 { 1106 1107 return (EOPNOTSUPP); 1108 } 1109 1110 int 1111 vfs_stdsync(mp, waitfor) 1112 struct mount *mp; 1113 int waitfor; 1114 { 1115 struct vnode *vp, *mvp; 1116 struct thread *td; 1117 int error, lockreq, allerror = 0; 1118 1119 td = curthread; 1120 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1121 if (waitfor != MNT_WAIT) 1122 lockreq |= LK_NOWAIT; 1123 /* 1124 * Force stale buffer cache information to be flushed. 1125 */ 1126 loop: 1127 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1128 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1129 VI_UNLOCK(vp); 1130 continue; 1131 } 1132 if ((error = vget(vp, lockreq, td)) != 0) { 1133 if (error == ENOENT) { 1134 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1135 goto loop; 1136 } 1137 continue; 1138 } 1139 error = VOP_FSYNC(vp, waitfor, td); 1140 if (error) 1141 allerror = error; 1142 vput(vp); 1143 } 1144 return (allerror); 1145 } 1146 1147 int 1148 vfs_stdnosync (mp, waitfor) 1149 struct mount *mp; 1150 int waitfor; 1151 { 1152 1153 return (0); 1154 } 1155 1156 int 1157 vfs_stdvget (mp, ino, flags, vpp) 1158 struct mount *mp; 1159 ino_t ino; 1160 int flags; 1161 struct vnode **vpp; 1162 { 1163 1164 return (EOPNOTSUPP); 1165 } 1166 1167 int 1168 vfs_stdfhtovp (mp, fhp, flags, vpp) 1169 struct mount *mp; 1170 struct fid *fhp; 1171 int flags; 1172 struct vnode **vpp; 1173 { 1174 1175 return (EOPNOTSUPP); 1176 } 1177 1178 int 1179 vfs_stdinit (vfsp) 1180 struct vfsconf *vfsp; 1181 { 1182 1183 return (0); 1184 } 1185 1186 int 1187 vfs_stduninit (vfsp) 1188 struct vfsconf *vfsp; 1189 { 1190 1191 return(0); 1192 } 1193 1194 int 1195 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 1196 struct mount *mp; 1197 int cmd; 1198 struct vnode *filename_vp; 1199 int attrnamespace; 1200 const char *attrname; 1201 { 1202 1203 if (filename_vp != NULL) 1204 VOP_UNLOCK(filename_vp, 0); 1205 return (EOPNOTSUPP); 1206 } 1207 1208 int 1209 vfs_stdsysctl(mp, op, req) 1210 struct mount *mp; 1211 fsctlop_t op; 1212 struct sysctl_req *req; 1213 { 1214 1215 return (EOPNOTSUPP); 1216 } 1217 1218 /* end of vfs default ops */
Cache object: f213c0193aadf17a26e5951bb45e94fe
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