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/9.2/sys/kern/vfs_default.c 248029 2013-03-08 08:09:26Z kib $"); 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 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 87 /* 88 * This vnode table stores what we want to do if the filesystem doesn't 89 * implement a particular VOP. 90 * 91 * If there is no specific entry here, we will return EOPNOTSUPP. 92 * 93 * Note that every filesystem has to implement either vop_access 94 * or vop_accessx; failing to do so will result in immediate crash 95 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(), 96 * which calls vop_stdaccess() etc. 97 */ 98 99 struct vop_vector default_vnodeops = { 100 .vop_default = NULL, 101 .vop_bypass = VOP_EOPNOTSUPP, 102 103 .vop_access = vop_stdaccess, 104 .vop_accessx = vop_stdaccessx, 105 .vop_advise = vop_stdadvise, 106 .vop_advlock = vop_stdadvlock, 107 .vop_advlockasync = vop_stdadvlockasync, 108 .vop_advlockpurge = vop_stdadvlockpurge, 109 .vop_allocate = vop_stdallocate, 110 .vop_bmap = vop_stdbmap, 111 .vop_close = VOP_NULL, 112 .vop_fsync = VOP_NULL, 113 .vop_getpages = vop_stdgetpages, 114 .vop_getwritemount = vop_stdgetwritemount, 115 .vop_inactive = VOP_NULL, 116 .vop_ioctl = VOP_ENOTTY, 117 .vop_kqfilter = vop_stdkqfilter, 118 .vop_islocked = vop_stdislocked, 119 .vop_lock1 = vop_stdlock, 120 .vop_lookup = vop_nolookup, 121 .vop_open = VOP_NULL, 122 .vop_pathconf = VOP_EINVAL, 123 .vop_poll = vop_nopoll, 124 .vop_putpages = vop_stdputpages, 125 .vop_readlink = VOP_EINVAL, 126 .vop_rename = vop_norename, 127 .vop_revoke = VOP_PANIC, 128 .vop_strategy = vop_nostrategy, 129 .vop_unlock = vop_stdunlock, 130 .vop_vptocnp = vop_stdvptocnp, 131 .vop_vptofh = vop_stdvptofh, 132 .vop_unp_bind = vop_stdunp_bind, 133 .vop_unp_connect = vop_stdunp_connect, 134 .vop_unp_detach = vop_stdunp_detach, 135 .vop_is_text = vop_stdis_text, 136 .vop_set_text = vop_stdset_text, 137 .vop_unset_text = vop_stdunset_text, 138 .vop_get_writecount = vop_stdget_writecount, 139 .vop_add_writecount = vop_stdadd_writecount, 140 }; 141 142 /* 143 * Series of placeholder functions for various error returns for 144 * VOPs. 145 */ 146 147 int 148 vop_eopnotsupp(struct vop_generic_args *ap) 149 { 150 /* 151 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 152 */ 153 154 return (EOPNOTSUPP); 155 } 156 157 int 158 vop_ebadf(struct vop_generic_args *ap) 159 { 160 161 return (EBADF); 162 } 163 164 int 165 vop_enotty(struct vop_generic_args *ap) 166 { 167 168 return (ENOTTY); 169 } 170 171 int 172 vop_einval(struct vop_generic_args *ap) 173 { 174 175 return (EINVAL); 176 } 177 178 int 179 vop_enoent(struct vop_generic_args *ap) 180 { 181 182 return (ENOENT); 183 } 184 185 int 186 vop_null(struct vop_generic_args *ap) 187 { 188 189 return (0); 190 } 191 192 /* 193 * Helper function to panic on some bad VOPs in some filesystems. 194 */ 195 int 196 vop_panic(struct vop_generic_args *ap) 197 { 198 199 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 200 } 201 202 /* 203 * vop_std<something> and vop_no<something> are default functions for use by 204 * filesystems that need the "default reasonable" implementation for a 205 * particular operation. 206 * 207 * The documentation for the operations they implement exists (if it exists) 208 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 209 */ 210 211 /* 212 * Default vop for filesystems that do not support name lookup 213 */ 214 static int 215 vop_nolookup(ap) 216 struct vop_lookup_args /* { 217 struct vnode *a_dvp; 218 struct vnode **a_vpp; 219 struct componentname *a_cnp; 220 } */ *ap; 221 { 222 223 *ap->a_vpp = NULL; 224 return (ENOTDIR); 225 } 226 227 /* 228 * vop_norename: 229 * 230 * Handle unlock and reference counting for arguments of vop_rename 231 * for filesystems that do not implement rename operation. 232 */ 233 static int 234 vop_norename(struct vop_rename_args *ap) 235 { 236 237 vop_rename_fail(ap); 238 return (EOPNOTSUPP); 239 } 240 241 /* 242 * vop_nostrategy: 243 * 244 * Strategy routine for VFS devices that have none. 245 * 246 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 247 * routine. Typically this is done for a BIO_READ strategy call. 248 * Typically B_INVAL is assumed to already be clear prior to a write 249 * and should not be cleared manually unless you just made the buffer 250 * invalid. BIO_ERROR should be cleared either way. 251 */ 252 253 static int 254 vop_nostrategy (struct vop_strategy_args *ap) 255 { 256 printf("No strategy for buffer at %p\n", ap->a_bp); 257 vprint("vnode", ap->a_vp); 258 ap->a_bp->b_ioflags |= BIO_ERROR; 259 ap->a_bp->b_error = EOPNOTSUPP; 260 bufdone(ap->a_bp); 261 return (EOPNOTSUPP); 262 } 263 264 static int 265 get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf, 266 int dirbuflen, off_t *off, char **cpos, int *len, 267 int *eofflag, struct thread *td) 268 { 269 int error, reclen; 270 struct uio uio; 271 struct iovec iov; 272 struct dirent *dp; 273 274 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 275 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 276 277 if (*len == 0) { 278 iov.iov_base = dirbuf; 279 iov.iov_len = dirbuflen; 280 281 uio.uio_iov = &iov; 282 uio.uio_iovcnt = 1; 283 uio.uio_offset = *off; 284 uio.uio_resid = dirbuflen; 285 uio.uio_segflg = UIO_SYSSPACE; 286 uio.uio_rw = UIO_READ; 287 uio.uio_td = td; 288 289 *eofflag = 0; 290 291 #ifdef MAC 292 error = mac_vnode_check_readdir(td->td_ucred, vp); 293 if (error == 0) 294 #endif 295 error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag, 296 NULL, NULL); 297 if (error) 298 return (error); 299 300 *off = uio.uio_offset; 301 302 *cpos = dirbuf; 303 *len = (dirbuflen - uio.uio_resid); 304 305 if (*len == 0) 306 return (ENOENT); 307 } 308 309 dp = (struct dirent *)(*cpos); 310 reclen = dp->d_reclen; 311 *dpp = dp; 312 313 /* check for malformed directory.. */ 314 if (reclen < DIRENT_MINSIZE) 315 return (EINVAL); 316 317 *cpos += reclen; 318 *len -= reclen; 319 320 return (0); 321 } 322 323 /* 324 * Check if a named file exists in a given directory vnode. 325 */ 326 static int 327 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td) 328 { 329 char *dirbuf, *cpos; 330 int error, eofflag, dirbuflen, len, found; 331 off_t off; 332 struct dirent *dp; 333 struct vattr va; 334 335 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp)); 336 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp)); 337 338 found = 0; 339 340 error = VOP_GETATTR(vp, &va, td->td_ucred); 341 if (error) 342 return (found); 343 344 dirbuflen = DEV_BSIZE; 345 if (dirbuflen < va.va_blocksize) 346 dirbuflen = va.va_blocksize; 347 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 348 349 off = 0; 350 len = 0; 351 do { 352 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off, 353 &cpos, &len, &eofflag, td); 354 if (error) 355 goto out; 356 357 if ((dp->d_type != DT_WHT) && 358 !strcmp(dp->d_name, dirname)) { 359 found = 1; 360 goto out; 361 } 362 } while (len > 0 || !eofflag); 363 364 out: 365 free(dirbuf, M_TEMP); 366 return (found); 367 } 368 369 int 370 vop_stdaccess(struct vop_access_args *ap) 371 { 372 373 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | 374 VAPPEND)) == 0, ("invalid bit in accmode")); 375 376 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td)); 377 } 378 379 int 380 vop_stdaccessx(struct vop_accessx_args *ap) 381 { 382 int error; 383 accmode_t accmode = ap->a_accmode; 384 385 error = vfs_unixify_accmode(&accmode); 386 if (error != 0) 387 return (error); 388 389 if (accmode == 0) 390 return (0); 391 392 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td)); 393 } 394 395 /* 396 * Advisory record locking support 397 */ 398 int 399 vop_stdadvlock(struct vop_advlock_args *ap) 400 { 401 struct vnode *vp; 402 struct ucred *cred; 403 struct vattr vattr; 404 int error; 405 406 vp = ap->a_vp; 407 cred = curthread->td_ucred; 408 vn_lock(vp, LK_SHARED | LK_RETRY); 409 error = VOP_GETATTR(vp, &vattr, cred); 410 VOP_UNLOCK(vp, 0); 411 if (error) 412 return (error); 413 414 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size)); 415 } 416 417 int 418 vop_stdadvlockasync(struct vop_advlockasync_args *ap) 419 { 420 struct vnode *vp; 421 struct ucred *cred; 422 struct vattr vattr; 423 int error; 424 425 vp = ap->a_vp; 426 cred = curthread->td_ucred; 427 vn_lock(vp, LK_SHARED | LK_RETRY); 428 error = VOP_GETATTR(vp, &vattr, cred); 429 VOP_UNLOCK(vp, 0); 430 if (error) 431 return (error); 432 433 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 434 } 435 436 int 437 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap) 438 { 439 struct vnode *vp; 440 441 vp = ap->a_vp; 442 lf_purgelocks(vp, &vp->v_lockf); 443 return (0); 444 } 445 446 /* 447 * vop_stdpathconf: 448 * 449 * Standard implementation of POSIX pathconf, to get information about limits 450 * for a filesystem. 451 * Override per filesystem for the case where the filesystem has smaller 452 * limits. 453 */ 454 int 455 vop_stdpathconf(ap) 456 struct vop_pathconf_args /* { 457 struct vnode *a_vp; 458 int a_name; 459 int *a_retval; 460 } */ *ap; 461 { 462 463 switch (ap->a_name) { 464 case _PC_NAME_MAX: 465 *ap->a_retval = NAME_MAX; 466 return (0); 467 case _PC_PATH_MAX: 468 *ap->a_retval = PATH_MAX; 469 return (0); 470 case _PC_LINK_MAX: 471 *ap->a_retval = LINK_MAX; 472 return (0); 473 case _PC_MAX_CANON: 474 *ap->a_retval = MAX_CANON; 475 return (0); 476 case _PC_MAX_INPUT: 477 *ap->a_retval = MAX_INPUT; 478 return (0); 479 case _PC_PIPE_BUF: 480 *ap->a_retval = PIPE_BUF; 481 return (0); 482 case _PC_CHOWN_RESTRICTED: 483 *ap->a_retval = 1; 484 return (0); 485 case _PC_VDISABLE: 486 *ap->a_retval = _POSIX_VDISABLE; 487 return (0); 488 default: 489 return (EINVAL); 490 } 491 /* NOTREACHED */ 492 } 493 494 /* 495 * Standard lock, unlock and islocked functions. 496 */ 497 int 498 vop_stdlock(ap) 499 struct vop_lock1_args /* { 500 struct vnode *a_vp; 501 int a_flags; 502 char *file; 503 int line; 504 } */ *ap; 505 { 506 struct vnode *vp = ap->a_vp; 507 508 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp), 509 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file, 510 ap->a_line)); 511 } 512 513 /* See above. */ 514 int 515 vop_stdunlock(ap) 516 struct vop_unlock_args /* { 517 struct vnode *a_vp; 518 int a_flags; 519 } */ *ap; 520 { 521 struct vnode *vp = ap->a_vp; 522 523 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp))); 524 } 525 526 /* See above. */ 527 int 528 vop_stdislocked(ap) 529 struct vop_islocked_args /* { 530 struct vnode *a_vp; 531 } */ *ap; 532 { 533 534 return (lockstatus(ap->a_vp->v_vnlock)); 535 } 536 537 /* 538 * Return true for select/poll. 539 */ 540 int 541 vop_nopoll(ap) 542 struct vop_poll_args /* { 543 struct vnode *a_vp; 544 int a_events; 545 struct ucred *a_cred; 546 struct thread *a_td; 547 } */ *ap; 548 { 549 550 return (poll_no_poll(ap->a_events)); 551 } 552 553 /* 554 * Implement poll for local filesystems that support it. 555 */ 556 int 557 vop_stdpoll(ap) 558 struct vop_poll_args /* { 559 struct vnode *a_vp; 560 int a_events; 561 struct ucred *a_cred; 562 struct thread *a_td; 563 } */ *ap; 564 { 565 if (ap->a_events & ~POLLSTANDARD) 566 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 567 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 568 } 569 570 /* 571 * Return our mount point, as we will take charge of the writes. 572 */ 573 int 574 vop_stdgetwritemount(ap) 575 struct vop_getwritemount_args /* { 576 struct vnode *a_vp; 577 struct mount **a_mpp; 578 } */ *ap; 579 { 580 struct mount *mp; 581 582 /* 583 * XXX Since this is called unlocked we may be recycled while 584 * attempting to ref the mount. If this is the case or mountpoint 585 * will be set to NULL. We only have to prevent this call from 586 * returning with a ref to an incorrect mountpoint. It is not 587 * harmful to return with a ref to our previous mountpoint. 588 */ 589 mp = ap->a_vp->v_mount; 590 if (mp != NULL) { 591 vfs_ref(mp); 592 if (mp != ap->a_vp->v_mount) { 593 vfs_rel(mp); 594 mp = NULL; 595 } 596 } 597 *(ap->a_mpp) = mp; 598 return (0); 599 } 600 601 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 602 int 603 vop_stdbmap(ap) 604 struct vop_bmap_args /* { 605 struct vnode *a_vp; 606 daddr_t a_bn; 607 struct bufobj **a_bop; 608 daddr_t *a_bnp; 609 int *a_runp; 610 int *a_runb; 611 } */ *ap; 612 { 613 614 if (ap->a_bop != NULL) 615 *ap->a_bop = &ap->a_vp->v_bufobj; 616 if (ap->a_bnp != NULL) 617 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 618 if (ap->a_runp != NULL) 619 *ap->a_runp = 0; 620 if (ap->a_runb != NULL) 621 *ap->a_runb = 0; 622 return (0); 623 } 624 625 int 626 vop_stdfsync(ap) 627 struct vop_fsync_args /* { 628 struct vnode *a_vp; 629 struct ucred *a_cred; 630 int a_waitfor; 631 struct thread *a_td; 632 } */ *ap; 633 { 634 struct vnode *vp = ap->a_vp; 635 struct buf *bp; 636 struct bufobj *bo; 637 struct buf *nbp; 638 int error = 0; 639 int maxretry = 1000; /* large, arbitrarily chosen */ 640 641 bo = &vp->v_bufobj; 642 BO_LOCK(bo); 643 loop1: 644 /* 645 * MARK/SCAN initialization to avoid infinite loops. 646 */ 647 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 648 bp->b_vflags &= ~BV_SCANNED; 649 bp->b_error = 0; 650 } 651 652 /* 653 * Flush all dirty buffers associated with a vnode. 654 */ 655 loop2: 656 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 657 if ((bp->b_vflags & BV_SCANNED) != 0) 658 continue; 659 bp->b_vflags |= BV_SCANNED; 660 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 661 if (ap->a_waitfor != MNT_WAIT) 662 continue; 663 if (BUF_LOCK(bp, 664 LK_EXCLUSIVE | LK_INTERLOCK | LK_SLEEPFAIL, 665 BO_MTX(bo)) != 0) { 666 BO_LOCK(bo); 667 goto loop1; 668 } 669 BO_LOCK(bo); 670 } 671 BO_UNLOCK(bo); 672 KASSERT(bp->b_bufobj == bo, 673 ("bp %p wrong b_bufobj %p should be %p", 674 bp, bp->b_bufobj, bo)); 675 if ((bp->b_flags & B_DELWRI) == 0) 676 panic("fsync: not dirty"); 677 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 678 vfs_bio_awrite(bp); 679 } else { 680 bremfree(bp); 681 bawrite(bp); 682 } 683 BO_LOCK(bo); 684 goto loop2; 685 } 686 687 /* 688 * If synchronous the caller expects us to completely resolve all 689 * dirty buffers in the system. Wait for in-progress I/O to 690 * complete (which could include background bitmap writes), then 691 * retry if dirty blocks still exist. 692 */ 693 if (ap->a_waitfor == MNT_WAIT) { 694 bufobj_wwait(bo, 0, 0); 695 if (bo->bo_dirty.bv_cnt > 0) { 696 /* 697 * If we are unable to write any of these buffers 698 * then we fail now rather than trying endlessly 699 * to write them out. 700 */ 701 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 702 if ((error = bp->b_error) == 0) 703 continue; 704 if (error == 0 && --maxretry >= 0) 705 goto loop1; 706 error = EAGAIN; 707 } 708 } 709 BO_UNLOCK(bo); 710 if (error == EAGAIN) 711 vprint("fsync: giving up on dirty", vp); 712 713 return (error); 714 } 715 716 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 717 int 718 vop_stdgetpages(ap) 719 struct vop_getpages_args /* { 720 struct vnode *a_vp; 721 vm_page_t *a_m; 722 int a_count; 723 int a_reqpage; 724 vm_ooffset_t a_offset; 725 } */ *ap; 726 { 727 728 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 729 ap->a_count, ap->a_reqpage); 730 } 731 732 int 733 vop_stdkqfilter(struct vop_kqfilter_args *ap) 734 { 735 return vfs_kqfilter(ap); 736 } 737 738 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 739 int 740 vop_stdputpages(ap) 741 struct vop_putpages_args /* { 742 struct vnode *a_vp; 743 vm_page_t *a_m; 744 int a_count; 745 int a_sync; 746 int *a_rtvals; 747 vm_ooffset_t a_offset; 748 } */ *ap; 749 { 750 751 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 752 ap->a_sync, ap->a_rtvals); 753 } 754 755 int 756 vop_stdvptofh(struct vop_vptofh_args *ap) 757 { 758 return (EOPNOTSUPP); 759 } 760 761 int 762 vop_stdvptocnp(struct vop_vptocnp_args *ap) 763 { 764 struct vnode *vp = ap->a_vp; 765 struct vnode **dvp = ap->a_vpp; 766 struct ucred *cred = ap->a_cred; 767 char *buf = ap->a_buf; 768 int *buflen = ap->a_buflen; 769 char *dirbuf, *cpos; 770 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 771 off_t off; 772 ino_t fileno; 773 struct vattr va; 774 struct nameidata nd; 775 struct thread *td; 776 struct dirent *dp; 777 struct vnode *mvp; 778 779 i = *buflen; 780 error = 0; 781 covered = 0; 782 td = curthread; 783 784 if (vp->v_type != VDIR) 785 return (ENOENT); 786 787 error = VOP_GETATTR(vp, &va, cred); 788 if (error) 789 return (error); 790 791 VREF(vp); 792 locked = VOP_ISLOCKED(vp); 793 VOP_UNLOCK(vp, 0); 794 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 795 "..", vp, td); 796 flags = FREAD; 797 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 798 if (error) { 799 vn_lock(vp, locked | LK_RETRY); 800 return (error); 801 } 802 NDFREE(&nd, NDF_ONLY_PNBUF); 803 804 mvp = *dvp = nd.ni_vp; 805 806 if (vp->v_mount != (*dvp)->v_mount && 807 ((*dvp)->v_vflag & VV_ROOT) && 808 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 809 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 810 VREF(mvp); 811 VOP_UNLOCK(mvp, 0); 812 vn_close(mvp, FREAD, cred, td); 813 VREF(*dvp); 814 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 815 covered = 1; 816 } 817 818 fileno = va.va_fileid; 819 820 dirbuflen = DEV_BSIZE; 821 if (dirbuflen < va.va_blocksize) 822 dirbuflen = va.va_blocksize; 823 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 824 825 if ((*dvp)->v_type != VDIR) { 826 error = ENOENT; 827 goto out; 828 } 829 830 off = 0; 831 len = 0; 832 do { 833 /* call VOP_READDIR of parent */ 834 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 835 &cpos, &len, &eofflag, td); 836 if (error) 837 goto out; 838 839 if ((dp->d_type != DT_WHT) && 840 (dp->d_fileno == fileno)) { 841 if (covered) { 842 VOP_UNLOCK(*dvp, 0); 843 vn_lock(mvp, LK_EXCLUSIVE | LK_RETRY); 844 if (dirent_exists(mvp, dp->d_name, td)) { 845 error = ENOENT; 846 VOP_UNLOCK(mvp, 0); 847 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 848 goto out; 849 } 850 VOP_UNLOCK(mvp, 0); 851 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 852 } 853 i -= dp->d_namlen; 854 855 if (i < 0) { 856 error = ENOMEM; 857 goto out; 858 } 859 if (dp->d_namlen == 1 && dp->d_name[0] == '.') { 860 error = ENOENT; 861 } else { 862 bcopy(dp->d_name, buf + i, dp->d_namlen); 863 error = 0; 864 } 865 goto out; 866 } 867 } while (len > 0 || !eofflag); 868 error = ENOENT; 869 870 out: 871 free(dirbuf, M_TEMP); 872 if (!error) { 873 *buflen = i; 874 vref(*dvp); 875 } 876 if (covered) { 877 vput(*dvp); 878 vrele(mvp); 879 } else { 880 VOP_UNLOCK(mvp, 0); 881 vn_close(mvp, FREAD, cred, td); 882 } 883 vn_lock(vp, locked | LK_RETRY); 884 return (error); 885 } 886 887 int 888 vop_stdallocate(struct vop_allocate_args *ap) 889 { 890 #ifdef __notyet__ 891 struct statfs sfs; 892 #endif 893 struct iovec aiov; 894 struct vattr vattr, *vap; 895 struct uio auio; 896 off_t fsize, len, cur, offset; 897 uint8_t *buf; 898 struct thread *td; 899 struct vnode *vp; 900 size_t iosize; 901 int error; 902 903 buf = NULL; 904 error = 0; 905 td = curthread; 906 vap = &vattr; 907 vp = ap->a_vp; 908 len = *ap->a_len; 909 offset = *ap->a_offset; 910 911 error = VOP_GETATTR(vp, vap, td->td_ucred); 912 if (error != 0) 913 goto out; 914 fsize = vap->va_size; 915 iosize = vap->va_blocksize; 916 if (iosize == 0) 917 iosize = BLKDEV_IOSIZE; 918 if (iosize > MAXPHYS) 919 iosize = MAXPHYS; 920 buf = malloc(iosize, M_TEMP, M_WAITOK); 921 922 #ifdef __notyet__ 923 /* 924 * Check if the filesystem sets f_maxfilesize; if not use 925 * VOP_SETATTR to perform the check. 926 */ 927 error = VFS_STATFS(vp->v_mount, &sfs, td); 928 if (error != 0) 929 goto out; 930 if (sfs.f_maxfilesize) { 931 if (offset > sfs.f_maxfilesize || len > sfs.f_maxfilesize || 932 offset + len > sfs.f_maxfilesize) { 933 error = EFBIG; 934 goto out; 935 } 936 } else 937 #endif 938 if (offset + len > vap->va_size) { 939 /* 940 * Test offset + len against the filesystem's maxfilesize. 941 */ 942 VATTR_NULL(vap); 943 vap->va_size = offset + len; 944 error = VOP_SETATTR(vp, vap, td->td_ucred); 945 if (error != 0) 946 goto out; 947 VATTR_NULL(vap); 948 vap->va_size = fsize; 949 error = VOP_SETATTR(vp, vap, td->td_ucred); 950 if (error != 0) 951 goto out; 952 } 953 954 for (;;) { 955 /* 956 * Read and write back anything below the nominal file 957 * size. There's currently no way outside the filesystem 958 * to know whether this area is sparse or not. 959 */ 960 cur = iosize; 961 if ((offset % iosize) != 0) 962 cur -= (offset % iosize); 963 if (cur > len) 964 cur = len; 965 if (offset < fsize) { 966 aiov.iov_base = buf; 967 aiov.iov_len = cur; 968 auio.uio_iov = &aiov; 969 auio.uio_iovcnt = 1; 970 auio.uio_offset = offset; 971 auio.uio_resid = cur; 972 auio.uio_segflg = UIO_SYSSPACE; 973 auio.uio_rw = UIO_READ; 974 auio.uio_td = td; 975 error = VOP_READ(vp, &auio, 0, td->td_ucred); 976 if (error != 0) 977 break; 978 if (auio.uio_resid > 0) { 979 bzero(buf + cur - auio.uio_resid, 980 auio.uio_resid); 981 } 982 } else { 983 bzero(buf, cur); 984 } 985 986 aiov.iov_base = buf; 987 aiov.iov_len = cur; 988 auio.uio_iov = &aiov; 989 auio.uio_iovcnt = 1; 990 auio.uio_offset = offset; 991 auio.uio_resid = cur; 992 auio.uio_segflg = UIO_SYSSPACE; 993 auio.uio_rw = UIO_WRITE; 994 auio.uio_td = td; 995 996 error = VOP_WRITE(vp, &auio, 0, td->td_ucred); 997 if (error != 0) 998 break; 999 1000 len -= cur; 1001 offset += cur; 1002 if (len == 0) 1003 break; 1004 if (should_yield()) 1005 break; 1006 } 1007 1008 out: 1009 *ap->a_len = len; 1010 *ap->a_offset = offset; 1011 free(buf, M_TEMP); 1012 return (error); 1013 } 1014 1015 int 1016 vop_stdadvise(struct vop_advise_args *ap) 1017 { 1018 struct vnode *vp; 1019 off_t start, end; 1020 int error, vfslocked; 1021 1022 vp = ap->a_vp; 1023 switch (ap->a_advice) { 1024 case POSIX_FADV_WILLNEED: 1025 /* 1026 * Do nothing for now. Filesystems should provide a 1027 * custom method which starts an asynchronous read of 1028 * the requested region. 1029 */ 1030 error = 0; 1031 break; 1032 case POSIX_FADV_DONTNEED: 1033 /* 1034 * Flush any open FS buffers and then remove pages 1035 * from the backing VM object. Using vinvalbuf() here 1036 * is a bit heavy-handed as it flushes all buffers for 1037 * the given vnode, not just the buffers covering the 1038 * requested range. 1039 */ 1040 error = 0; 1041 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 1042 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1043 if (vp->v_iflag & VI_DOOMED) { 1044 VOP_UNLOCK(vp, 0); 1045 VFS_UNLOCK_GIANT(vfslocked); 1046 break; 1047 } 1048 vinvalbuf(vp, V_CLEANONLY, 0, 0); 1049 if (vp->v_object != NULL) { 1050 start = trunc_page(ap->a_start); 1051 end = round_page(ap->a_end); 1052 VM_OBJECT_LOCK(vp->v_object); 1053 vm_object_page_cache(vp->v_object, OFF_TO_IDX(start), 1054 OFF_TO_IDX(end)); 1055 VM_OBJECT_UNLOCK(vp->v_object); 1056 } 1057 VOP_UNLOCK(vp, 0); 1058 VFS_UNLOCK_GIANT(vfslocked); 1059 break; 1060 default: 1061 error = EINVAL; 1062 break; 1063 } 1064 return (error); 1065 } 1066 1067 int 1068 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1069 { 1070 1071 ap->a_vp->v_socket = ap->a_socket; 1072 return (0); 1073 } 1074 1075 int 1076 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1077 { 1078 1079 *ap->a_socket = ap->a_vp->v_socket; 1080 return (0); 1081 } 1082 1083 int 1084 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1085 { 1086 1087 ap->a_vp->v_socket = NULL; 1088 return (0); 1089 } 1090 1091 static int 1092 vop_stdis_text(struct vop_is_text_args *ap) 1093 { 1094 1095 return ((ap->a_vp->v_vflag & VV_TEXT) != 0); 1096 } 1097 1098 static int 1099 vop_stdset_text(struct vop_set_text_args *ap) 1100 { 1101 1102 ap->a_vp->v_vflag |= VV_TEXT; 1103 return (0); 1104 } 1105 1106 static int 1107 vop_stdunset_text(struct vop_unset_text_args *ap) 1108 { 1109 1110 ap->a_vp->v_vflag &= ~VV_TEXT; 1111 return (0); 1112 } 1113 1114 static int 1115 vop_stdget_writecount(struct vop_get_writecount_args *ap) 1116 { 1117 1118 *ap->a_writecount = ap->a_vp->v_writecount; 1119 return (0); 1120 } 1121 1122 static int 1123 vop_stdadd_writecount(struct vop_add_writecount_args *ap) 1124 { 1125 1126 ap->a_vp->v_writecount += ap->a_inc; 1127 return (0); 1128 } 1129 1130 /* 1131 * vfs default ops 1132 * used to fill the vfs function table to get reasonable default return values. 1133 */ 1134 int 1135 vfs_stdroot (mp, flags, vpp) 1136 struct mount *mp; 1137 int flags; 1138 struct vnode **vpp; 1139 { 1140 1141 return (EOPNOTSUPP); 1142 } 1143 1144 int 1145 vfs_stdstatfs (mp, sbp) 1146 struct mount *mp; 1147 struct statfs *sbp; 1148 { 1149 1150 return (EOPNOTSUPP); 1151 } 1152 1153 int 1154 vfs_stdquotactl (mp, cmds, uid, arg) 1155 struct mount *mp; 1156 int cmds; 1157 uid_t uid; 1158 void *arg; 1159 { 1160 1161 return (EOPNOTSUPP); 1162 } 1163 1164 int 1165 vfs_stdsync(mp, waitfor) 1166 struct mount *mp; 1167 int waitfor; 1168 { 1169 struct vnode *vp, *mvp; 1170 struct thread *td; 1171 int error, lockreq, allerror = 0; 1172 1173 td = curthread; 1174 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1175 if (waitfor != MNT_WAIT) 1176 lockreq |= LK_NOWAIT; 1177 /* 1178 * Force stale buffer cache information to be flushed. 1179 */ 1180 loop: 1181 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1182 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1183 VI_UNLOCK(vp); 1184 continue; 1185 } 1186 if ((error = vget(vp, lockreq, td)) != 0) { 1187 if (error == ENOENT) { 1188 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1189 goto loop; 1190 } 1191 continue; 1192 } 1193 error = VOP_FSYNC(vp, waitfor, td); 1194 if (error) 1195 allerror = error; 1196 vput(vp); 1197 } 1198 return (allerror); 1199 } 1200 1201 int 1202 vfs_stdnosync (mp, waitfor) 1203 struct mount *mp; 1204 int waitfor; 1205 { 1206 1207 return (0); 1208 } 1209 1210 int 1211 vfs_stdvget (mp, ino, flags, vpp) 1212 struct mount *mp; 1213 ino_t ino; 1214 int flags; 1215 struct vnode **vpp; 1216 { 1217 1218 return (EOPNOTSUPP); 1219 } 1220 1221 int 1222 vfs_stdfhtovp (mp, fhp, flags, vpp) 1223 struct mount *mp; 1224 struct fid *fhp; 1225 int flags; 1226 struct vnode **vpp; 1227 { 1228 1229 return (EOPNOTSUPP); 1230 } 1231 1232 int 1233 vfs_stdinit (vfsp) 1234 struct vfsconf *vfsp; 1235 { 1236 1237 return (0); 1238 } 1239 1240 int 1241 vfs_stduninit (vfsp) 1242 struct vfsconf *vfsp; 1243 { 1244 1245 return(0); 1246 } 1247 1248 int 1249 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 1250 struct mount *mp; 1251 int cmd; 1252 struct vnode *filename_vp; 1253 int attrnamespace; 1254 const char *attrname; 1255 { 1256 1257 if (filename_vp != NULL) 1258 VOP_UNLOCK(filename_vp, 0); 1259 return (EOPNOTSUPP); 1260 } 1261 1262 int 1263 vfs_stdsysctl(mp, op, req) 1264 struct mount *mp; 1265 fsctlop_t op; 1266 struct sysctl_req *req; 1267 { 1268 1269 return (EOPNOTSUPP); 1270 } 1271 1272 /* end of vfs default ops */
Cache object: 913774c9f8ef95bb4d8d24886750e51b
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