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/10.4/sys/kern/vfs_default.c 304590 2016-08-22 07:26:43Z 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/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 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 && dp->d_fileno != 0 && 358 strcmp(dp->d_name, dirname) == 0) { 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 vattr vattr; 403 int error; 404 405 vp = ap->a_vp; 406 if (ap->a_fl->l_whence == SEEK_END) { 407 /* 408 * The NFSv4 server must avoid doing a vn_lock() here, since it 409 * can deadlock the nfsd threads, due to a LOR. Fortunately 410 * the NFSv4 server always uses SEEK_SET and this code is 411 * only required for the SEEK_END case. 412 */ 413 vn_lock(vp, LK_SHARED | LK_RETRY); 414 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 415 VOP_UNLOCK(vp, 0); 416 if (error) 417 return (error); 418 } else 419 vattr.va_size = 0; 420 421 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size)); 422 } 423 424 int 425 vop_stdadvlockasync(struct vop_advlockasync_args *ap) 426 { 427 struct vnode *vp; 428 struct vattr vattr; 429 int error; 430 431 vp = ap->a_vp; 432 if (ap->a_fl->l_whence == SEEK_END) { 433 /* The size argument is only needed for SEEK_END. */ 434 vn_lock(vp, LK_SHARED | LK_RETRY); 435 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred); 436 VOP_UNLOCK(vp, 0); 437 if (error) 438 return (error); 439 } else 440 vattr.va_size = 0; 441 442 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size)); 443 } 444 445 int 446 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap) 447 { 448 struct vnode *vp; 449 450 vp = ap->a_vp; 451 lf_purgelocks(vp, &vp->v_lockf); 452 return (0); 453 } 454 455 /* 456 * vop_stdpathconf: 457 * 458 * Standard implementation of POSIX pathconf, to get information about limits 459 * for a filesystem. 460 * Override per filesystem for the case where the filesystem has smaller 461 * limits. 462 */ 463 int 464 vop_stdpathconf(ap) 465 struct vop_pathconf_args /* { 466 struct vnode *a_vp; 467 int a_name; 468 int *a_retval; 469 } */ *ap; 470 { 471 472 switch (ap->a_name) { 473 case _PC_NAME_MAX: 474 *ap->a_retval = NAME_MAX; 475 return (0); 476 case _PC_PATH_MAX: 477 *ap->a_retval = PATH_MAX; 478 return (0); 479 case _PC_LINK_MAX: 480 *ap->a_retval = LINK_MAX; 481 return (0); 482 case _PC_MAX_CANON: 483 *ap->a_retval = MAX_CANON; 484 return (0); 485 case _PC_MAX_INPUT: 486 *ap->a_retval = MAX_INPUT; 487 return (0); 488 case _PC_PIPE_BUF: 489 *ap->a_retval = PIPE_BUF; 490 return (0); 491 case _PC_CHOWN_RESTRICTED: 492 *ap->a_retval = 1; 493 return (0); 494 case _PC_VDISABLE: 495 *ap->a_retval = _POSIX_VDISABLE; 496 return (0); 497 default: 498 return (EINVAL); 499 } 500 /* NOTREACHED */ 501 } 502 503 /* 504 * Standard lock, unlock and islocked functions. 505 */ 506 int 507 vop_stdlock(ap) 508 struct vop_lock1_args /* { 509 struct vnode *a_vp; 510 int a_flags; 511 char *file; 512 int line; 513 } */ *ap; 514 { 515 struct vnode *vp = ap->a_vp; 516 517 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp), 518 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file, 519 ap->a_line)); 520 } 521 522 /* See above. */ 523 int 524 vop_stdunlock(ap) 525 struct vop_unlock_args /* { 526 struct vnode *a_vp; 527 int a_flags; 528 } */ *ap; 529 { 530 struct vnode *vp = ap->a_vp; 531 532 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp))); 533 } 534 535 /* See above. */ 536 int 537 vop_stdislocked(ap) 538 struct vop_islocked_args /* { 539 struct vnode *a_vp; 540 } */ *ap; 541 { 542 543 return (lockstatus(ap->a_vp->v_vnlock)); 544 } 545 546 /* 547 * Return true for select/poll. 548 */ 549 int 550 vop_nopoll(ap) 551 struct vop_poll_args /* { 552 struct vnode *a_vp; 553 int a_events; 554 struct ucred *a_cred; 555 struct thread *a_td; 556 } */ *ap; 557 { 558 559 return (poll_no_poll(ap->a_events)); 560 } 561 562 /* 563 * Implement poll for local filesystems that support it. 564 */ 565 int 566 vop_stdpoll(ap) 567 struct vop_poll_args /* { 568 struct vnode *a_vp; 569 int a_events; 570 struct ucred *a_cred; 571 struct thread *a_td; 572 } */ *ap; 573 { 574 if (ap->a_events & ~POLLSTANDARD) 575 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 576 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 577 } 578 579 /* 580 * Return our mount point, as we will take charge of the writes. 581 */ 582 int 583 vop_stdgetwritemount(ap) 584 struct vop_getwritemount_args /* { 585 struct vnode *a_vp; 586 struct mount **a_mpp; 587 } */ *ap; 588 { 589 struct mount *mp; 590 591 /* 592 * XXX Since this is called unlocked we may be recycled while 593 * attempting to ref the mount. If this is the case or mountpoint 594 * will be set to NULL. We only have to prevent this call from 595 * returning with a ref to an incorrect mountpoint. It is not 596 * harmful to return with a ref to our previous mountpoint. 597 */ 598 mp = ap->a_vp->v_mount; 599 if (mp != NULL) { 600 vfs_ref(mp); 601 if (mp != ap->a_vp->v_mount) { 602 vfs_rel(mp); 603 mp = NULL; 604 } 605 } 606 *(ap->a_mpp) = mp; 607 return (0); 608 } 609 610 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 611 int 612 vop_stdbmap(ap) 613 struct vop_bmap_args /* { 614 struct vnode *a_vp; 615 daddr_t a_bn; 616 struct bufobj **a_bop; 617 daddr_t *a_bnp; 618 int *a_runp; 619 int *a_runb; 620 } */ *ap; 621 { 622 623 if (ap->a_bop != NULL) 624 *ap->a_bop = &ap->a_vp->v_bufobj; 625 if (ap->a_bnp != NULL) 626 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 627 if (ap->a_runp != NULL) 628 *ap->a_runp = 0; 629 if (ap->a_runb != NULL) 630 *ap->a_runb = 0; 631 return (0); 632 } 633 634 int 635 vop_stdfsync(ap) 636 struct vop_fsync_args /* { 637 struct vnode *a_vp; 638 int a_waitfor; 639 struct thread *a_td; 640 } */ *ap; 641 { 642 struct vnode *vp = ap->a_vp; 643 struct buf *bp; 644 struct bufobj *bo; 645 struct buf *nbp; 646 int error = 0; 647 int maxretry = 1000; /* large, arbitrarily chosen */ 648 649 bo = &vp->v_bufobj; 650 BO_LOCK(bo); 651 loop1: 652 /* 653 * MARK/SCAN initialization to avoid infinite loops. 654 */ 655 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 656 bp->b_vflags &= ~BV_SCANNED; 657 bp->b_error = 0; 658 } 659 660 /* 661 * Flush all dirty buffers associated with a vnode. 662 */ 663 loop2: 664 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 665 if ((bp->b_vflags & BV_SCANNED) != 0) 666 continue; 667 bp->b_vflags |= BV_SCANNED; 668 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { 669 if (ap->a_waitfor != MNT_WAIT) 670 continue; 671 if (BUF_LOCK(bp, 672 LK_EXCLUSIVE | LK_INTERLOCK | LK_SLEEPFAIL, 673 BO_LOCKPTR(bo)) != 0) { 674 BO_LOCK(bo); 675 goto loop1; 676 } 677 BO_LOCK(bo); 678 } 679 BO_UNLOCK(bo); 680 KASSERT(bp->b_bufobj == bo, 681 ("bp %p wrong b_bufobj %p should be %p", 682 bp, bp->b_bufobj, bo)); 683 if ((bp->b_flags & B_DELWRI) == 0) 684 panic("fsync: not dirty"); 685 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 686 vfs_bio_awrite(bp); 687 } else { 688 bremfree(bp); 689 bawrite(bp); 690 } 691 BO_LOCK(bo); 692 goto loop2; 693 } 694 695 /* 696 * If synchronous the caller expects us to completely resolve all 697 * dirty buffers in the system. Wait for in-progress I/O to 698 * complete (which could include background bitmap writes), then 699 * retry if dirty blocks still exist. 700 */ 701 if (ap->a_waitfor == MNT_WAIT) { 702 bufobj_wwait(bo, 0, 0); 703 if (bo->bo_dirty.bv_cnt > 0) { 704 /* 705 * If we are unable to write any of these buffers 706 * then we fail now rather than trying endlessly 707 * to write them out. 708 */ 709 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 710 if ((error = bp->b_error) == 0) 711 continue; 712 if (error == 0 && --maxretry >= 0) 713 goto loop1; 714 error = EAGAIN; 715 } 716 } 717 BO_UNLOCK(bo); 718 if (error == EAGAIN) 719 vprint("fsync: giving up on dirty", vp); 720 721 return (error); 722 } 723 724 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 725 int 726 vop_stdgetpages(ap) 727 struct vop_getpages_args /* { 728 struct vnode *a_vp; 729 vm_page_t *a_m; 730 int a_count; 731 int a_reqpage; 732 vm_ooffset_t a_offset; 733 } */ *ap; 734 { 735 736 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 737 ap->a_count, ap->a_reqpage); 738 } 739 740 int 741 vop_stdkqfilter(struct vop_kqfilter_args *ap) 742 { 743 return vfs_kqfilter(ap); 744 } 745 746 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 747 int 748 vop_stdputpages(ap) 749 struct vop_putpages_args /* { 750 struct vnode *a_vp; 751 vm_page_t *a_m; 752 int a_count; 753 int a_sync; 754 int *a_rtvals; 755 vm_ooffset_t a_offset; 756 } */ *ap; 757 { 758 759 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 760 ap->a_sync, ap->a_rtvals); 761 } 762 763 int 764 vop_stdvptofh(struct vop_vptofh_args *ap) 765 { 766 return (EOPNOTSUPP); 767 } 768 769 int 770 vop_stdvptocnp(struct vop_vptocnp_args *ap) 771 { 772 struct vnode *vp = ap->a_vp; 773 struct vnode **dvp = ap->a_vpp; 774 struct ucred *cred = ap->a_cred; 775 char *buf = ap->a_buf; 776 int *buflen = ap->a_buflen; 777 char *dirbuf, *cpos; 778 int i, error, eofflag, dirbuflen, flags, locked, len, covered; 779 off_t off; 780 ino_t fileno; 781 struct vattr va; 782 struct nameidata nd; 783 struct thread *td; 784 struct dirent *dp; 785 struct vnode *mvp; 786 787 i = *buflen; 788 error = 0; 789 covered = 0; 790 td = curthread; 791 792 if (vp->v_type != VDIR) 793 return (ENOENT); 794 795 error = VOP_GETATTR(vp, &va, cred); 796 if (error) 797 return (error); 798 799 VREF(vp); 800 locked = VOP_ISLOCKED(vp); 801 VOP_UNLOCK(vp, 0); 802 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 803 "..", vp, td); 804 flags = FREAD; 805 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL); 806 if (error) { 807 vn_lock(vp, locked | LK_RETRY); 808 return (error); 809 } 810 NDFREE(&nd, NDF_ONLY_PNBUF); 811 812 mvp = *dvp = nd.ni_vp; 813 814 if (vp->v_mount != (*dvp)->v_mount && 815 ((*dvp)->v_vflag & VV_ROOT) && 816 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) { 817 *dvp = (*dvp)->v_mount->mnt_vnodecovered; 818 VREF(mvp); 819 VOP_UNLOCK(mvp, 0); 820 vn_close(mvp, FREAD, cred, td); 821 VREF(*dvp); 822 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 823 covered = 1; 824 } 825 826 fileno = va.va_fileid; 827 828 dirbuflen = DEV_BSIZE; 829 if (dirbuflen < va.va_blocksize) 830 dirbuflen = va.va_blocksize; 831 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK); 832 833 if ((*dvp)->v_type != VDIR) { 834 error = ENOENT; 835 goto out; 836 } 837 838 off = 0; 839 len = 0; 840 do { 841 /* call VOP_READDIR of parent */ 842 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off, 843 &cpos, &len, &eofflag, td); 844 if (error) 845 goto out; 846 847 if ((dp->d_type != DT_WHT) && 848 (dp->d_fileno == fileno)) { 849 if (covered) { 850 VOP_UNLOCK(*dvp, 0); 851 vn_lock(mvp, LK_EXCLUSIVE | LK_RETRY); 852 if (dirent_exists(mvp, dp->d_name, td)) { 853 error = ENOENT; 854 VOP_UNLOCK(mvp, 0); 855 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 856 goto out; 857 } 858 VOP_UNLOCK(mvp, 0); 859 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY); 860 } 861 i -= dp->d_namlen; 862 863 if (i < 0) { 864 error = ENOMEM; 865 goto out; 866 } 867 if (dp->d_namlen == 1 && dp->d_name[0] == '.') { 868 error = ENOENT; 869 } else { 870 bcopy(dp->d_name, buf + i, dp->d_namlen); 871 error = 0; 872 } 873 goto out; 874 } 875 } while (len > 0 || !eofflag); 876 error = ENOENT; 877 878 out: 879 free(dirbuf, M_TEMP); 880 if (!error) { 881 *buflen = i; 882 vref(*dvp); 883 } 884 if (covered) { 885 vput(*dvp); 886 vrele(mvp); 887 } else { 888 VOP_UNLOCK(mvp, 0); 889 vn_close(mvp, FREAD, cred, td); 890 } 891 vn_lock(vp, locked | LK_RETRY); 892 return (error); 893 } 894 895 int 896 vop_stdallocate(struct vop_allocate_args *ap) 897 { 898 #ifdef __notyet__ 899 struct statfs sfs; 900 #endif 901 struct iovec aiov; 902 struct vattr vattr, *vap; 903 struct uio auio; 904 off_t fsize, len, cur, offset; 905 uint8_t *buf; 906 struct thread *td; 907 struct vnode *vp; 908 size_t iosize; 909 int error; 910 911 buf = NULL; 912 error = 0; 913 td = curthread; 914 vap = &vattr; 915 vp = ap->a_vp; 916 len = *ap->a_len; 917 offset = *ap->a_offset; 918 919 error = VOP_GETATTR(vp, vap, td->td_ucred); 920 if (error != 0) 921 goto out; 922 fsize = vap->va_size; 923 iosize = vap->va_blocksize; 924 if (iosize == 0) 925 iosize = BLKDEV_IOSIZE; 926 if (iosize > MAXPHYS) 927 iosize = MAXPHYS; 928 buf = malloc(iosize, M_TEMP, M_WAITOK); 929 930 #ifdef __notyet__ 931 /* 932 * Check if the filesystem sets f_maxfilesize; if not use 933 * VOP_SETATTR to perform the check. 934 */ 935 error = VFS_STATFS(vp->v_mount, &sfs, td); 936 if (error != 0) 937 goto out; 938 if (sfs.f_maxfilesize) { 939 if (offset > sfs.f_maxfilesize || len > sfs.f_maxfilesize || 940 offset + len > sfs.f_maxfilesize) { 941 error = EFBIG; 942 goto out; 943 } 944 } else 945 #endif 946 if (offset + len > vap->va_size) { 947 /* 948 * Test offset + len against the filesystem's maxfilesize. 949 */ 950 VATTR_NULL(vap); 951 vap->va_size = offset + len; 952 error = VOP_SETATTR(vp, vap, td->td_ucred); 953 if (error != 0) 954 goto out; 955 VATTR_NULL(vap); 956 vap->va_size = fsize; 957 error = VOP_SETATTR(vp, vap, td->td_ucred); 958 if (error != 0) 959 goto out; 960 } 961 962 for (;;) { 963 /* 964 * Read and write back anything below the nominal file 965 * size. There's currently no way outside the filesystem 966 * to know whether this area is sparse or not. 967 */ 968 cur = iosize; 969 if ((offset % iosize) != 0) 970 cur -= (offset % iosize); 971 if (cur > len) 972 cur = len; 973 if (offset < fsize) { 974 aiov.iov_base = buf; 975 aiov.iov_len = cur; 976 auio.uio_iov = &aiov; 977 auio.uio_iovcnt = 1; 978 auio.uio_offset = offset; 979 auio.uio_resid = cur; 980 auio.uio_segflg = UIO_SYSSPACE; 981 auio.uio_rw = UIO_READ; 982 auio.uio_td = td; 983 error = VOP_READ(vp, &auio, 0, td->td_ucred); 984 if (error != 0) 985 break; 986 if (auio.uio_resid > 0) { 987 bzero(buf + cur - auio.uio_resid, 988 auio.uio_resid); 989 } 990 } else { 991 bzero(buf, cur); 992 } 993 994 aiov.iov_base = buf; 995 aiov.iov_len = cur; 996 auio.uio_iov = &aiov; 997 auio.uio_iovcnt = 1; 998 auio.uio_offset = offset; 999 auio.uio_resid = cur; 1000 auio.uio_segflg = UIO_SYSSPACE; 1001 auio.uio_rw = UIO_WRITE; 1002 auio.uio_td = td; 1003 1004 error = VOP_WRITE(vp, &auio, 0, td->td_ucred); 1005 if (error != 0) 1006 break; 1007 1008 len -= cur; 1009 offset += cur; 1010 if (len == 0) 1011 break; 1012 if (should_yield()) 1013 break; 1014 } 1015 1016 out: 1017 *ap->a_len = len; 1018 *ap->a_offset = offset; 1019 free(buf, M_TEMP); 1020 return (error); 1021 } 1022 1023 int 1024 vop_stdadvise(struct vop_advise_args *ap) 1025 { 1026 struct vnode *vp; 1027 off_t start, end; 1028 int error; 1029 1030 vp = ap->a_vp; 1031 switch (ap->a_advice) { 1032 case POSIX_FADV_WILLNEED: 1033 /* 1034 * Do nothing for now. Filesystems should provide a 1035 * custom method which starts an asynchronous read of 1036 * the requested region. 1037 */ 1038 error = 0; 1039 break; 1040 case POSIX_FADV_DONTNEED: 1041 /* 1042 * Flush any open FS buffers and then remove pages 1043 * from the backing VM object. Using vinvalbuf() here 1044 * is a bit heavy-handed as it flushes all buffers for 1045 * the given vnode, not just the buffers covering the 1046 * requested range. 1047 */ 1048 error = 0; 1049 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1050 if (vp->v_iflag & VI_DOOMED) { 1051 VOP_UNLOCK(vp, 0); 1052 break; 1053 } 1054 vinvalbuf(vp, V_CLEANONLY, 0, 0); 1055 if (vp->v_object != NULL) { 1056 start = trunc_page(ap->a_start); 1057 end = round_page(ap->a_end); 1058 VM_OBJECT_WLOCK(vp->v_object); 1059 vm_object_page_cache(vp->v_object, OFF_TO_IDX(start), 1060 OFF_TO_IDX(end)); 1061 VM_OBJECT_WUNLOCK(vp->v_object); 1062 } 1063 VOP_UNLOCK(vp, 0); 1064 break; 1065 default: 1066 error = EINVAL; 1067 break; 1068 } 1069 return (error); 1070 } 1071 1072 int 1073 vop_stdunp_bind(struct vop_unp_bind_args *ap) 1074 { 1075 1076 ap->a_vp->v_socket = ap->a_socket; 1077 return (0); 1078 } 1079 1080 int 1081 vop_stdunp_connect(struct vop_unp_connect_args *ap) 1082 { 1083 1084 *ap->a_socket = ap->a_vp->v_socket; 1085 return (0); 1086 } 1087 1088 int 1089 vop_stdunp_detach(struct vop_unp_detach_args *ap) 1090 { 1091 1092 ap->a_vp->v_socket = NULL; 1093 return (0); 1094 } 1095 1096 static int 1097 vop_stdis_text(struct vop_is_text_args *ap) 1098 { 1099 1100 return ((ap->a_vp->v_vflag & VV_TEXT) != 0); 1101 } 1102 1103 static int 1104 vop_stdset_text(struct vop_set_text_args *ap) 1105 { 1106 1107 ap->a_vp->v_vflag |= VV_TEXT; 1108 return (0); 1109 } 1110 1111 static int 1112 vop_stdunset_text(struct vop_unset_text_args *ap) 1113 { 1114 1115 ap->a_vp->v_vflag &= ~VV_TEXT; 1116 return (0); 1117 } 1118 1119 static int 1120 vop_stdget_writecount(struct vop_get_writecount_args *ap) 1121 { 1122 1123 *ap->a_writecount = ap->a_vp->v_writecount; 1124 return (0); 1125 } 1126 1127 static int 1128 vop_stdadd_writecount(struct vop_add_writecount_args *ap) 1129 { 1130 1131 ap->a_vp->v_writecount += ap->a_inc; 1132 return (0); 1133 } 1134 1135 /* 1136 * vfs default ops 1137 * used to fill the vfs function table to get reasonable default return values. 1138 */ 1139 int 1140 vfs_stdroot (mp, flags, vpp) 1141 struct mount *mp; 1142 int flags; 1143 struct vnode **vpp; 1144 { 1145 1146 return (EOPNOTSUPP); 1147 } 1148 1149 int 1150 vfs_stdstatfs (mp, sbp) 1151 struct mount *mp; 1152 struct statfs *sbp; 1153 { 1154 1155 return (EOPNOTSUPP); 1156 } 1157 1158 int 1159 vfs_stdquotactl (mp, cmds, uid, arg) 1160 struct mount *mp; 1161 int cmds; 1162 uid_t uid; 1163 void *arg; 1164 { 1165 1166 return (EOPNOTSUPP); 1167 } 1168 1169 int 1170 vfs_stdsync(mp, waitfor) 1171 struct mount *mp; 1172 int waitfor; 1173 { 1174 struct vnode *vp, *mvp; 1175 struct thread *td; 1176 int error, lockreq, allerror = 0; 1177 1178 td = curthread; 1179 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 1180 if (waitfor != MNT_WAIT) 1181 lockreq |= LK_NOWAIT; 1182 /* 1183 * Force stale buffer cache information to be flushed. 1184 */ 1185 loop: 1186 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1187 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 1188 VI_UNLOCK(vp); 1189 continue; 1190 } 1191 if ((error = vget(vp, lockreq, td)) != 0) { 1192 if (error == ENOENT) { 1193 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1194 goto loop; 1195 } 1196 continue; 1197 } 1198 error = VOP_FSYNC(vp, waitfor, td); 1199 if (error) 1200 allerror = error; 1201 vput(vp); 1202 } 1203 return (allerror); 1204 } 1205 1206 int 1207 vfs_stdnosync (mp, waitfor) 1208 struct mount *mp; 1209 int waitfor; 1210 { 1211 1212 return (0); 1213 } 1214 1215 int 1216 vfs_stdvget (mp, ino, flags, vpp) 1217 struct mount *mp; 1218 ino_t ino; 1219 int flags; 1220 struct vnode **vpp; 1221 { 1222 1223 return (EOPNOTSUPP); 1224 } 1225 1226 int 1227 vfs_stdfhtovp (mp, fhp, flags, vpp) 1228 struct mount *mp; 1229 struct fid *fhp; 1230 int flags; 1231 struct vnode **vpp; 1232 { 1233 1234 return (EOPNOTSUPP); 1235 } 1236 1237 int 1238 vfs_stdinit (vfsp) 1239 struct vfsconf *vfsp; 1240 { 1241 1242 return (0); 1243 } 1244 1245 int 1246 vfs_stduninit (vfsp) 1247 struct vfsconf *vfsp; 1248 { 1249 1250 return(0); 1251 } 1252 1253 int 1254 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname) 1255 struct mount *mp; 1256 int cmd; 1257 struct vnode *filename_vp; 1258 int attrnamespace; 1259 const char *attrname; 1260 { 1261 1262 if (filename_vp != NULL) 1263 VOP_UNLOCK(filename_vp, 0); 1264 return (EOPNOTSUPP); 1265 } 1266 1267 int 1268 vfs_stdsysctl(mp, op, req) 1269 struct mount *mp; 1270 fsctlop_t op; 1271 struct sysctl_req *req; 1272 { 1273 1274 return (EOPNOTSUPP); 1275 } 1276 1277 /* end of vfs default ops */
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