1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)vfs_subr.c 8.13 (Berkeley) 4/18/94 39 * $Id: vfs_subr.c,v 1.29 1995/05/12 04:24:53 davidg Exp $ 40 */ 41 42 /* 43 * External virtual filesystem routines 44 */ 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/time.h> 51 #include <sys/vnode.h> 52 #include <sys/stat.h> 53 #include <sys/namei.h> 54 #include <sys/ucred.h> 55 #include <sys/buf.h> 56 #include <sys/errno.h> 57 #include <sys/malloc.h> 58 #include <sys/domain.h> 59 #include <sys/mbuf.h> 60 61 #include <vm/vm.h> 62 #include <sys/sysctl.h> 63 64 #include <miscfs/specfs/specdev.h> 65 66 void insmntque __P((struct vnode *, struct mount *)); 67 68 enum vtype iftovt_tab[16] = { 69 VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, 70 VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, 71 }; 72 int vttoif_tab[9] = { 73 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 74 S_IFSOCK, S_IFIFO, S_IFMT, 75 }; 76 77 /* 78 * Insq/Remq for the vnode usage lists. 79 */ 80 #define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs) 81 #define bufremvn(bp) { \ 82 LIST_REMOVE(bp, b_vnbufs); \ 83 (bp)->b_vnbufs.le_next = NOLIST; \ 84 } 85 86 TAILQ_HEAD(freelst, vnode) vnode_free_list; /* vnode free list */ 87 u_long freevnodes = 0; 88 89 struct mntlist mountlist; /* mounted filesystem list */ 90 91 int desiredvnodes; 92 93 /* 94 * Initialize the vnode management data structures. 95 */ 96 void 97 vntblinit() 98 { 99 desiredvnodes = maxproc + vm_object_cache_max; 100 101 TAILQ_INIT(&vnode_free_list); 102 TAILQ_INIT(&mountlist); 103 } 104 105 /* 106 * Lock a filesystem. 107 * Used to prevent access to it while mounting and unmounting. 108 */ 109 int 110 vfs_lock(mp) 111 register struct mount *mp; 112 { 113 114 while (mp->mnt_flag & MNT_MLOCK) { 115 mp->mnt_flag |= MNT_MWAIT; 116 (void) tsleep((caddr_t) mp, PVFS, "vfslck", 0); 117 } 118 mp->mnt_flag |= MNT_MLOCK; 119 return (0); 120 } 121 122 /* 123 * Unlock a locked filesystem. 124 * Panic if filesystem is not locked. 125 */ 126 void 127 vfs_unlock(mp) 128 register struct mount *mp; 129 { 130 131 if ((mp->mnt_flag & MNT_MLOCK) == 0) 132 panic("vfs_unlock: not locked"); 133 mp->mnt_flag &= ~MNT_MLOCK; 134 if (mp->mnt_flag & MNT_MWAIT) { 135 mp->mnt_flag &= ~MNT_MWAIT; 136 wakeup((caddr_t) mp); 137 } 138 } 139 140 /* 141 * Mark a mount point as busy. 142 * Used to synchronize access and to delay unmounting. 143 */ 144 int 145 vfs_busy(mp) 146 register struct mount *mp; 147 { 148 149 while (mp->mnt_flag & MNT_MPBUSY) { 150 mp->mnt_flag |= MNT_MPWANT; 151 (void) tsleep((caddr_t) &mp->mnt_flag, PVFS, "vfsbsy", 0); 152 } 153 if (mp->mnt_flag & MNT_UNMOUNT) 154 return (1); 155 mp->mnt_flag |= MNT_MPBUSY; 156 return (0); 157 } 158 159 /* 160 * Free a busy filesystem. 161 * Panic if filesystem is not busy. 162 */ 163 void 164 vfs_unbusy(mp) 165 register struct mount *mp; 166 { 167 168 if ((mp->mnt_flag & MNT_MPBUSY) == 0) 169 panic("vfs_unbusy: not busy"); 170 mp->mnt_flag &= ~MNT_MPBUSY; 171 if (mp->mnt_flag & MNT_MPWANT) { 172 mp->mnt_flag &= ~MNT_MPWANT; 173 wakeup((caddr_t) &mp->mnt_flag); 174 } 175 } 176 177 void 178 vfs_unmountroot(rootfs) 179 struct mount *rootfs; 180 { 181 struct mount *mp = rootfs; 182 int error; 183 184 if (vfs_busy(mp)) { 185 printf("failed to unmount root\n"); 186 return; 187 } 188 mp->mnt_flag |= MNT_UNMOUNT; 189 if ((error = vfs_lock(mp))) { 190 printf("lock of root filesystem failed (%d)\n", error); 191 return; 192 } 193 vnode_pager_umount(mp); /* release cached vnodes */ 194 cache_purgevfs(mp); /* remove cache entries for this file sys */ 195 196 if ((error = VFS_SYNC(mp, MNT_WAIT, initproc->p_ucred, initproc))) 197 printf("sync of root filesystem failed (%d)\n", error); 198 199 if ((error = VFS_UNMOUNT(mp, MNT_FORCE, initproc))) { 200 printf("unmount of root filesystem failed ("); 201 if (error == EBUSY) 202 printf("BUSY)\n"); 203 else 204 printf("%d)\n", error); 205 } 206 mp->mnt_flag &= ~MNT_UNMOUNT; 207 vfs_unbusy(mp); 208 } 209 210 /* 211 * Unmount all filesystems. Should only be called by halt(). 212 */ 213 void 214 vfs_unmountall() 215 { 216 struct mount *mp, *mp_next, *rootfs = NULL; 217 int error; 218 219 /* unmount all but rootfs */ 220 for (mp = mountlist.tqh_first; mp != NULL; mp = mp_next) { 221 mp_next = mp->mnt_list.tqe_next; 222 223 if (mp->mnt_flag & MNT_ROOTFS) { 224 rootfs = mp; 225 continue; 226 } 227 error = dounmount(mp, MNT_FORCE, initproc); 228 if (error) { 229 printf("unmount of %s failed (", mp->mnt_stat.f_mntonname); 230 if (error == EBUSY) 231 printf("BUSY)\n"); 232 else 233 printf("%d)\n", error); 234 } 235 } 236 237 /* and finally... */ 238 if (rootfs) { 239 vfs_unmountroot(rootfs); 240 } else { 241 printf("no root filesystem\n"); 242 } 243 } 244 245 /* 246 * Lookup a mount point by filesystem identifier. 247 */ 248 struct mount * 249 getvfs(fsid) 250 fsid_t *fsid; 251 { 252 register struct mount *mp; 253 254 for (mp = mountlist.tqh_first; mp != NULL; mp = mp->mnt_list.tqe_next) { 255 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 256 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) 257 return (mp); 258 } 259 return ((struct mount *) 0); 260 } 261 262 /* 263 * Get a new unique fsid 264 */ 265 void 266 getnewfsid(mp, mtype) 267 struct mount *mp; 268 int mtype; 269 { 270 static u_short xxxfs_mntid; 271 272 fsid_t tfsid; 273 274 mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0); 275 mp->mnt_stat.f_fsid.val[1] = mtype; 276 if (xxxfs_mntid == 0) 277 ++xxxfs_mntid; 278 tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid); 279 tfsid.val[1] = mtype; 280 if (mountlist.tqh_first != NULL) { 281 while (getvfs(&tfsid)) { 282 tfsid.val[0]++; 283 xxxfs_mntid++; 284 } 285 } 286 mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; 287 } 288 289 /* 290 * Set vnode attributes to VNOVAL 291 */ 292 void 293 vattr_null(vap) 294 register struct vattr *vap; 295 { 296 297 vap->va_type = VNON; 298 vap->va_size = VNOVAL; 299 vap->va_bytes = VNOVAL; 300 vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = 301 vap->va_fsid = vap->va_fileid = 302 vap->va_blocksize = vap->va_rdev = 303 vap->va_atime.ts_sec = vap->va_atime.ts_nsec = 304 vap->va_mtime.ts_sec = vap->va_mtime.ts_nsec = 305 vap->va_ctime.ts_sec = vap->va_ctime.ts_nsec = 306 vap->va_flags = vap->va_gen = VNOVAL; 307 vap->va_vaflags = 0; 308 } 309 310 /* 311 * Routines having to do with the management of the vnode table. 312 */ 313 extern int (**dead_vnodeop_p) (); 314 extern void vclean(); 315 316 /* 317 * Return the next vnode from the free list. 318 */ 319 int 320 getnewvnode(tag, mp, vops, vpp) 321 enum vtagtype tag; 322 struct mount *mp; 323 int (**vops) (); 324 struct vnode **vpp; 325 { 326 register struct vnode *vp; 327 328 vp = vnode_free_list.tqh_first; 329 /* 330 * we allocate a new vnode if 331 * 1. we don't have any free 332 * Pretty obvious, we actually used to panic, but that 333 * is a silly thing to do. 334 * 2. we havn't filled our pool yet 335 * We don't want to trash the incore (VM-)vnodecache. 336 * 3. if less that 1/4th of our vnodes are free. 337 * We don't want to trash the namei cache either. 338 */ 339 if (freevnodes < (numvnodes >> 2) || 340 numvnodes < desiredvnodes || 341 vp == NULL) { 342 vp = (struct vnode *) malloc((u_long) sizeof *vp, 343 M_VNODE, M_WAITOK); 344 bzero((char *) vp, sizeof *vp); 345 numvnodes++; 346 } else { 347 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 348 freevnodes--; 349 350 if (vp->v_usecount) 351 panic("free vnode isn't"); 352 353 /* see comment on why 0xdeadb is set at end of vgone (below) */ 354 vp->v_freelist.tqe_prev = (struct vnode **) 0xdeadb; 355 vp->v_lease = NULL; 356 if (vp->v_type != VBAD) 357 vgone(vp); 358 #ifdef DIAGNOSTIC 359 { 360 int s; 361 362 if (vp->v_data) 363 panic("cleaned vnode isn't"); 364 s = splbio(); 365 if (vp->v_numoutput) 366 panic("Clean vnode has pending I/O's"); 367 splx(s); 368 } 369 #endif 370 vp->v_flag = 0; 371 vp->v_lastr = 0; 372 vp->v_ralen = 0; 373 vp->v_maxra = 0; 374 vp->v_lastw = 0; 375 vp->v_lasta = 0; 376 vp->v_cstart = 0; 377 vp->v_clen = 0; 378 vp->v_socket = 0; 379 vp->v_writecount = 0; /* XXX */ 380 } 381 vp->v_type = VNON; 382 cache_purge(vp); 383 vp->v_tag = tag; 384 vp->v_op = vops; 385 insmntque(vp, mp); 386 *vpp = vp; 387 vp->v_usecount = 1; 388 vp->v_data = 0; 389 return (0); 390 } 391 392 /* 393 * Move a vnode from one mount queue to another. 394 */ 395 void 396 insmntque(vp, mp) 397 register struct vnode *vp; 398 register struct mount *mp; 399 { 400 401 /* 402 * Delete from old mount point vnode list, if on one. 403 */ 404 if (vp->v_mount != NULL) 405 LIST_REMOVE(vp, v_mntvnodes); 406 /* 407 * Insert into list of vnodes for the new mount point, if available. 408 */ 409 if ((vp->v_mount = mp) == NULL) 410 return; 411 LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes); 412 } 413 414 /* 415 * Update outstanding I/O count and do wakeup if requested. 416 */ 417 void 418 vwakeup(bp) 419 register struct buf *bp; 420 { 421 register struct vnode *vp; 422 423 bp->b_flags &= ~B_WRITEINPROG; 424 if ((vp = bp->b_vp)) { 425 vp->v_numoutput--; 426 if (vp->v_numoutput < 0) 427 panic("vwakeup: neg numoutput"); 428 if ((vp->v_numoutput == 0) && (vp->v_flag & VBWAIT)) { 429 vp->v_flag &= ~VBWAIT; 430 wakeup((caddr_t) &vp->v_numoutput); 431 } 432 } 433 } 434 435 /* 436 * Flush out and invalidate all buffers associated with a vnode. 437 * Called with the underlying object locked. 438 */ 439 int 440 vinvalbuf(vp, flags, cred, p, slpflag, slptimeo) 441 register struct vnode *vp; 442 int flags; 443 struct ucred *cred; 444 struct proc *p; 445 int slpflag, slptimeo; 446 { 447 register struct buf *bp; 448 struct buf *nbp, *blist; 449 int s, error; 450 vm_pager_t pager; 451 vm_object_t object; 452 453 if (flags & V_SAVE) { 454 if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p))) 455 return (error); 456 if (vp->v_dirtyblkhd.lh_first != NULL) 457 panic("vinvalbuf: dirty bufs"); 458 } 459 for (;;) { 460 if ((blist = vp->v_cleanblkhd.lh_first) && (flags & V_SAVEMETA)) 461 while (blist && blist->b_lblkno < 0) 462 blist = blist->b_vnbufs.le_next; 463 if (!blist && (blist = vp->v_dirtyblkhd.lh_first) && 464 (flags & V_SAVEMETA)) 465 while (blist && blist->b_lblkno < 0) 466 blist = blist->b_vnbufs.le_next; 467 if (!blist) 468 break; 469 470 for (bp = blist; bp; bp = nbp) { 471 nbp = bp->b_vnbufs.le_next; 472 if ((flags & V_SAVEMETA) && bp->b_lblkno < 0) 473 continue; 474 s = splbio(); 475 if (bp->b_flags & B_BUSY) { 476 bp->b_flags |= B_WANTED; 477 error = tsleep((caddr_t) bp, 478 slpflag | (PRIBIO + 1), "vinvalbuf", 479 slptimeo); 480 splx(s); 481 if (error) 482 return (error); 483 break; 484 } 485 bremfree(bp); 486 bp->b_flags |= B_BUSY; 487 splx(s); 488 /* 489 * XXX Since there are no node locks for NFS, I 490 * believe there is a slight chance that a delayed 491 * write will occur while sleeping just above, so 492 * check for it. 493 */ 494 if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { 495 (void) VOP_BWRITE(bp); 496 break; 497 } 498 bp->b_flags |= (B_INVAL|B_NOCACHE|B_RELBUF); 499 brelse(bp); 500 } 501 } 502 503 s = splbio(); 504 while (vp->v_numoutput > 0) { 505 vp->v_flag |= VBWAIT; 506 tsleep(&vp->v_numoutput, PVM, "vnvlbv", 0); 507 } 508 splx(s); 509 510 /* 511 * Destroy the copy in the VM cache, too. 512 */ 513 object = (vm_object_t) vp->v_vmdata; 514 if (object != NULL) { 515 vm_object_lock(object); 516 vm_object_page_remove(object, 0, object->size, 517 (flags & V_SAVE) ? TRUE : FALSE); 518 vm_object_unlock(object); 519 } 520 if (!(flags & V_SAVEMETA) && 521 (vp->v_dirtyblkhd.lh_first || vp->v_cleanblkhd.lh_first)) 522 panic("vinvalbuf: flush failed"); 523 return (0); 524 } 525 526 /* 527 * Associate a buffer with a vnode. 528 */ 529 void 530 bgetvp(vp, bp) 531 register struct vnode *vp; 532 register struct buf *bp; 533 { 534 int s; 535 536 if (bp->b_vp) 537 panic("bgetvp: not free"); 538 VHOLD(vp); 539 bp->b_vp = vp; 540 if (vp->v_type == VBLK || vp->v_type == VCHR) 541 bp->b_dev = vp->v_rdev; 542 else 543 bp->b_dev = NODEV; 544 /* 545 * Insert onto list for new vnode. 546 */ 547 s = splbio(); 548 bufinsvn(bp, &vp->v_cleanblkhd); 549 splx(s); 550 } 551 552 /* 553 * Disassociate a buffer from a vnode. 554 */ 555 void 556 brelvp(bp) 557 register struct buf *bp; 558 { 559 struct vnode *vp; 560 int s; 561 562 if (bp->b_vp == (struct vnode *) 0) 563 panic("brelvp: NULL"); 564 /* 565 * Delete from old vnode list, if on one. 566 */ 567 s = splbio(); 568 if (bp->b_vnbufs.le_next != NOLIST) 569 bufremvn(bp); 570 splx(s); 571 572 vp = bp->b_vp; 573 bp->b_vp = (struct vnode *) 0; 574 HOLDRELE(vp); 575 } 576 577 /* 578 * Associate a p-buffer with a vnode. 579 */ 580 void 581 pbgetvp(vp, bp) 582 register struct vnode *vp; 583 register struct buf *bp; 584 { 585 if (bp->b_vp) 586 panic("pbgetvp: not free"); 587 VHOLD(vp); 588 bp->b_vp = vp; 589 if (vp->v_type == VBLK || vp->v_type == VCHR) 590 bp->b_dev = vp->v_rdev; 591 else 592 bp->b_dev = NODEV; 593 } 594 595 /* 596 * Disassociate a p-buffer from a vnode. 597 */ 598 void 599 pbrelvp(bp) 600 register struct buf *bp; 601 { 602 struct vnode *vp; 603 604 if (bp->b_vp == (struct vnode *) 0) 605 panic("brelvp: NULL"); 606 607 vp = bp->b_vp; 608 bp->b_vp = (struct vnode *) 0; 609 HOLDRELE(vp); 610 } 611 612 /* 613 * Reassign a buffer from one vnode to another. 614 * Used to assign file specific control information 615 * (indirect blocks) to the vnode to which they belong. 616 */ 617 void 618 reassignbuf(bp, newvp) 619 register struct buf *bp; 620 register struct vnode *newvp; 621 { 622 register struct buflists *listheadp; 623 624 if (newvp == NULL) { 625 printf("reassignbuf: NULL"); 626 return; 627 } 628 /* 629 * Delete from old vnode list, if on one. 630 */ 631 if (bp->b_vnbufs.le_next != NOLIST) 632 bufremvn(bp); 633 /* 634 * If dirty, put on list of dirty buffers; otherwise insert onto list 635 * of clean buffers. 636 */ 637 if (bp->b_flags & B_DELWRI) { 638 struct buf *tbp; 639 640 tbp = newvp->v_dirtyblkhd.lh_first; 641 if (!tbp || (tbp->b_lblkno > bp->b_lblkno)) { 642 bufinsvn(bp, &newvp->v_dirtyblkhd); 643 } else { 644 while (tbp->b_vnbufs.le_next && (tbp->b_vnbufs.le_next->b_lblkno < bp->b_lblkno)) { 645 tbp = tbp->b_vnbufs.le_next; 646 } 647 LIST_INSERT_AFTER(tbp, bp, b_vnbufs); 648 } 649 } else { 650 listheadp = &newvp->v_cleanblkhd; 651 bufinsvn(bp, listheadp); 652 } 653 } 654 655 /* 656 * Create a vnode for a block device. 657 * Used for root filesystem, argdev, and swap areas. 658 * Also used for memory file system special devices. 659 */ 660 int 661 bdevvp(dev, vpp) 662 dev_t dev; 663 struct vnode **vpp; 664 { 665 register struct vnode *vp; 666 struct vnode *nvp; 667 int error; 668 669 if (dev == NODEV) 670 return (0); 671 error = getnewvnode(VT_NON, (struct mount *) 0, spec_vnodeop_p, &nvp); 672 if (error) { 673 *vpp = 0; 674 return (error); 675 } 676 vp = nvp; 677 vp->v_type = VBLK; 678 if ((nvp = checkalias(vp, dev, (struct mount *) 0))) { 679 vput(vp); 680 vp = nvp; 681 } 682 *vpp = vp; 683 return (0); 684 } 685 686 /* 687 * Check to see if the new vnode represents a special device 688 * for which we already have a vnode (either because of 689 * bdevvp() or because of a different vnode representing 690 * the same block device). If such an alias exists, deallocate 691 * the existing contents and return the aliased vnode. The 692 * caller is responsible for filling it with its new contents. 693 */ 694 struct vnode * 695 checkalias(nvp, nvp_rdev, mp) 696 register struct vnode *nvp; 697 dev_t nvp_rdev; 698 struct mount *mp; 699 { 700 register struct vnode *vp; 701 struct vnode **vpp; 702 703 if (nvp->v_type != VBLK && nvp->v_type != VCHR) 704 return (NULLVP); 705 706 vpp = &speclisth[SPECHASH(nvp_rdev)]; 707 loop: 708 for (vp = *vpp; vp; vp = vp->v_specnext) { 709 if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) 710 continue; 711 /* 712 * Alias, but not in use, so flush it out. 713 */ 714 if (vp->v_usecount == 0) { 715 vgone(vp); 716 goto loop; 717 } 718 if (vget(vp, 1)) 719 goto loop; 720 break; 721 } 722 if (vp == NULL || vp->v_tag != VT_NON) { 723 MALLOC(nvp->v_specinfo, struct specinfo *, 724 sizeof(struct specinfo), M_VNODE, M_WAITOK); 725 nvp->v_rdev = nvp_rdev; 726 nvp->v_hashchain = vpp; 727 nvp->v_specnext = *vpp; 728 nvp->v_specflags = 0; 729 *vpp = nvp; 730 if (vp != NULL) { 731 nvp->v_flag |= VALIASED; 732 vp->v_flag |= VALIASED; 733 vput(vp); 734 } 735 return (NULLVP); 736 } 737 VOP_UNLOCK(vp); 738 vclean(vp, 0); 739 vp->v_op = nvp->v_op; 740 vp->v_tag = nvp->v_tag; 741 nvp->v_type = VNON; 742 insmntque(vp, mp); 743 return (vp); 744 } 745 746 /* 747 * Grab a particular vnode from the free list, increment its 748 * reference count and lock it. The vnode lock bit is set the 749 * vnode is being eliminated in vgone. The process is awakened 750 * when the transition is completed, and an error returned to 751 * indicate that the vnode is no longer usable (possibly having 752 * been changed to a new file system type). 753 */ 754 int 755 vget(vp, lockflag) 756 register struct vnode *vp; 757 int lockflag; 758 { 759 760 /* 761 * If the vnode is in the process of being cleaned out for another 762 * use, we wait for the cleaning to finish and then return failure. 763 * Cleaning is determined either by checking that the VXLOCK flag is 764 * set, or that the use count is zero with the back pointer set to 765 * show that it has been removed from the free list by getnewvnode. 766 * The VXLOCK flag may not have been set yet because vclean is blocked 767 * in the VOP_LOCK call waiting for the VOP_INACTIVE to complete. 768 */ 769 if ((vp->v_flag & VXLOCK) || 770 (vp->v_usecount == 0 && 771 vp->v_freelist.tqe_prev == (struct vnode **) 0xdeadb)) { 772 vp->v_flag |= VXWANT; 773 (void) tsleep((caddr_t) vp, PINOD, "vget", 0); 774 return (1); 775 } 776 if (vp->v_usecount == 0) { 777 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 778 freevnodes--; 779 } 780 vp->v_usecount++; 781 if (lockflag) 782 VOP_LOCK(vp); 783 return (0); 784 } 785 786 /* 787 * Vnode reference, just increment the count 788 */ 789 void 790 vref(vp) 791 struct vnode *vp; 792 { 793 794 if (vp->v_usecount <= 0) 795 panic("vref used where vget required"); 796 vp->v_usecount++; 797 } 798 799 /* 800 * vput(), just unlock and vrele() 801 */ 802 void 803 vput(vp) 804 register struct vnode *vp; 805 { 806 807 VOP_UNLOCK(vp); 808 vrele(vp); 809 } 810 811 /* 812 * Vnode release. 813 * If count drops to zero, call inactive routine and return to freelist. 814 */ 815 void 816 vrele(vp) 817 register struct vnode *vp; 818 { 819 820 #ifdef DIAGNOSTIC 821 if (vp == NULL) 822 panic("vrele: null vp"); 823 #endif 824 vp->v_usecount--; 825 if (vp->v_usecount > 0) 826 return; 827 #ifdef DIAGNOSTIC 828 if (vp->v_usecount != 0 /* || vp->v_writecount != 0 */ ) { 829 vprint("vrele: bad ref count", vp); 830 panic("vrele: ref cnt"); 831 } 832 #endif 833 if (vp->v_flag & VAGE) { 834 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 835 vp->v_flag &= ~VAGE; 836 } else { 837 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 838 } 839 freevnodes++; 840 841 VOP_INACTIVE(vp); 842 } 843 844 /* 845 * Page or buffer structure gets a reference. 846 */ 847 void 848 vhold(vp) 849 register struct vnode *vp; 850 { 851 852 vp->v_holdcnt++; 853 } 854 855 /* 856 * Page or buffer structure frees a reference. 857 */ 858 void 859 holdrele(vp) 860 register struct vnode *vp; 861 { 862 863 if (vp->v_holdcnt <= 0) 864 panic("holdrele: holdcnt"); 865 vp->v_holdcnt--; 866 } 867 868 /* 869 * Remove any vnodes in the vnode table belonging to mount point mp. 870 * 871 * If MNT_NOFORCE is specified, there should not be any active ones, 872 * return error if any are found (nb: this is a user error, not a 873 * system error). If MNT_FORCE is specified, detach any active vnodes 874 * that are found. 875 */ 876 #ifdef DIAGNOSTIC 877 int busyprt = 0; /* print out busy vnodes */ 878 struct ctldebug debug1 = {"busyprt", &busyprt}; 879 880 #endif 881 882 int 883 vflush(mp, skipvp, flags) 884 struct mount *mp; 885 struct vnode *skipvp; 886 int flags; 887 { 888 register struct vnode *vp, *nvp; 889 int busy = 0; 890 891 if ((mp->mnt_flag & MNT_MPBUSY) == 0) 892 panic("vflush: not busy"); 893 loop: 894 for (vp = mp->mnt_vnodelist.lh_first; vp; vp = nvp) { 895 /* 896 * Make sure this vnode wasn't reclaimed in getnewvnode(). 897 * Start over if it has (it won't be on the list anymore). 898 */ 899 if (vp->v_mount != mp) 900 goto loop; 901 nvp = vp->v_mntvnodes.le_next; 902 /* 903 * Skip over a selected vnode. 904 */ 905 if (vp == skipvp) 906 continue; 907 /* 908 * Skip over a vnodes marked VSYSTEM. 909 */ 910 if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) 911 continue; 912 /* 913 * If WRITECLOSE is set, only flush out regular file vnodes 914 * open for writing. 915 */ 916 if ((flags & WRITECLOSE) && 917 (vp->v_writecount == 0 || vp->v_type != VREG)) 918 continue; 919 /* 920 * With v_usecount == 0, all we need to do is clear out the 921 * vnode data structures and we are done. 922 */ 923 if (vp->v_usecount == 0) { 924 vgone(vp); 925 continue; 926 } 927 /* 928 * If FORCECLOSE is set, forcibly close the vnode. For block 929 * or character devices, revert to an anonymous device. For 930 * all other files, just kill them. 931 */ 932 if (flags & FORCECLOSE) { 933 if (vp->v_type != VBLK && vp->v_type != VCHR) { 934 vgone(vp); 935 } else { 936 vclean(vp, 0); 937 vp->v_op = spec_vnodeop_p; 938 insmntque(vp, (struct mount *) 0); 939 } 940 continue; 941 } 942 #ifdef DIAGNOSTIC 943 if (busyprt) 944 vprint("vflush: busy vnode", vp); 945 #endif 946 busy++; 947 } 948 if (busy) 949 return (EBUSY); 950 return (0); 951 } 952 953 /* 954 * Disassociate the underlying file system from a vnode. 955 */ 956 void 957 vclean(vp, flags) 958 register struct vnode *vp; 959 int flags; 960 { 961 int active; 962 963 /* 964 * Check to see if the vnode is in use. If so we have to reference it 965 * before we clean it out so that its count cannot fall to zero and 966 * generate a race against ourselves to recycle it. 967 */ 968 if ((active = vp->v_usecount)) 969 VREF(vp); 970 /* 971 * Even if the count is zero, the VOP_INACTIVE routine may still have 972 * the object locked while it cleans it out. The VOP_LOCK ensures that 973 * the VOP_INACTIVE routine is done with its work. For active vnodes, 974 * it ensures that no other activity can occur while the underlying 975 * object is being cleaned out. 976 */ 977 VOP_LOCK(vp); 978 /* 979 * Prevent the vnode from being recycled or brought into use while we 980 * clean it out. 981 */ 982 if (vp->v_flag & VXLOCK) 983 panic("vclean: deadlock"); 984 vp->v_flag |= VXLOCK; 985 /* 986 * Clean out any buffers associated with the vnode. 987 */ 988 if (flags & DOCLOSE) 989 vinvalbuf(vp, V_SAVE, NOCRED, NULL, 0, 0); 990 /* 991 * Any other processes trying to obtain this lock must first wait for 992 * VXLOCK to clear, then call the new lock operation. 993 */ 994 VOP_UNLOCK(vp); 995 /* 996 * If purging an active vnode, it must be closed and deactivated 997 * before being reclaimed. 998 */ 999 if (active) { 1000 if (flags & DOCLOSE) 1001 VOP_CLOSE(vp, IO_NDELAY, NOCRED, NULL); 1002 VOP_INACTIVE(vp); 1003 } 1004 /* 1005 * Reclaim the vnode. 1006 */ 1007 if (VOP_RECLAIM(vp)) 1008 panic("vclean: cannot reclaim"); 1009 if (active) 1010 vrele(vp); 1011 1012 /* 1013 * Done with purge, notify sleepers of the grim news. 1014 */ 1015 vp->v_op = dead_vnodeop_p; 1016 vp->v_tag = VT_NON; 1017 vp->v_flag &= ~VXLOCK; 1018 if (vp->v_flag & VXWANT) { 1019 vp->v_flag &= ~VXWANT; 1020 wakeup((caddr_t) vp); 1021 } 1022 } 1023 1024 /* 1025 * Eliminate all activity associated with the requested vnode 1026 * and with all vnodes aliased to the requested vnode. 1027 */ 1028 void 1029 vgoneall(vp) 1030 register struct vnode *vp; 1031 { 1032 register struct vnode *vq; 1033 1034 if (vp->v_flag & VALIASED) { 1035 /* 1036 * If a vgone (or vclean) is already in progress, wait until 1037 * it is done and return. 1038 */ 1039 if (vp->v_flag & VXLOCK) { 1040 vp->v_flag |= VXWANT; 1041 (void) tsleep((caddr_t) vp, PINOD, "vgall", 0); 1042 return; 1043 } 1044 /* 1045 * Ensure that vp will not be vgone'd while we are eliminating 1046 * its aliases. 1047 */ 1048 vp->v_flag |= VXLOCK; 1049 while (vp->v_flag & VALIASED) { 1050 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1051 if (vq->v_rdev != vp->v_rdev || 1052 vq->v_type != vp->v_type || vp == vq) 1053 continue; 1054 vgone(vq); 1055 break; 1056 } 1057 } 1058 /* 1059 * Remove the lock so that vgone below will really eliminate 1060 * the vnode after which time vgone will awaken any sleepers. 1061 */ 1062 vp->v_flag &= ~VXLOCK; 1063 } 1064 vgone(vp); 1065 } 1066 1067 /* 1068 * Eliminate all activity associated with a vnode 1069 * in preparation for reuse. 1070 */ 1071 void 1072 vgone(vp) 1073 register struct vnode *vp; 1074 { 1075 register struct vnode *vq; 1076 struct vnode *vx; 1077 1078 /* 1079 * If a vgone (or vclean) is already in progress, wait until it is 1080 * done and return. 1081 */ 1082 if (vp->v_flag & VXLOCK) { 1083 vp->v_flag |= VXWANT; 1084 (void) tsleep((caddr_t) vp, PINOD, "vgone", 0); 1085 return; 1086 } 1087 /* 1088 * Clean out the filesystem specific data. 1089 */ 1090 vclean(vp, DOCLOSE); 1091 /* 1092 * Delete from old mount point vnode list, if on one. 1093 */ 1094 if (vp->v_mount != NULL) { 1095 LIST_REMOVE(vp, v_mntvnodes); 1096 vp->v_mount = NULL; 1097 } 1098 /* 1099 * If special device, remove it from special device alias list. 1100 */ 1101 if (vp->v_type == VBLK || vp->v_type == VCHR) { 1102 if (*vp->v_hashchain == vp) { 1103 *vp->v_hashchain = vp->v_specnext; 1104 } else { 1105 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1106 if (vq->v_specnext != vp) 1107 continue; 1108 vq->v_specnext = vp->v_specnext; 1109 break; 1110 } 1111 if (vq == NULL) 1112 panic("missing bdev"); 1113 } 1114 if (vp->v_flag & VALIASED) { 1115 vx = NULL; 1116 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1117 if (vq->v_rdev != vp->v_rdev || 1118 vq->v_type != vp->v_type) 1119 continue; 1120 if (vx) 1121 break; 1122 vx = vq; 1123 } 1124 if (vx == NULL) 1125 panic("missing alias"); 1126 if (vq == NULL) 1127 vx->v_flag &= ~VALIASED; 1128 vp->v_flag &= ~VALIASED; 1129 } 1130 FREE(vp->v_specinfo, M_VNODE); 1131 vp->v_specinfo = NULL; 1132 } 1133 /* 1134 * If it is on the freelist and not already at the head, move it to 1135 * the head of the list. The test of the back pointer and the 1136 * reference count of zero is because it will be removed from the free 1137 * list by getnewvnode, but will not have its reference count 1138 * incremented until after calling vgone. If the reference count were 1139 * incremented first, vgone would (incorrectly) try to close the 1140 * previous instance of the underlying object. So, the back pointer is 1141 * explicitly set to `0xdeadb' in getnewvnode after removing it from 1142 * the freelist to ensure that we do not try to move it here. 1143 */ 1144 if (vp->v_usecount == 0 && 1145 vp->v_freelist.tqe_prev != (struct vnode **) 0xdeadb && 1146 vnode_free_list.tqh_first != vp) { 1147 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 1148 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 1149 } 1150 vp->v_type = VBAD; 1151 } 1152 1153 /* 1154 * Lookup a vnode by device number. 1155 */ 1156 int 1157 vfinddev(dev, type, vpp) 1158 dev_t dev; 1159 enum vtype type; 1160 struct vnode **vpp; 1161 { 1162 register struct vnode *vp; 1163 1164 for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { 1165 if (dev != vp->v_rdev || type != vp->v_type) 1166 continue; 1167 *vpp = vp; 1168 return (1); 1169 } 1170 return (0); 1171 } 1172 1173 /* 1174 * Calculate the total number of references to a special device. 1175 */ 1176 int 1177 vcount(vp) 1178 register struct vnode *vp; 1179 { 1180 register struct vnode *vq, *vnext; 1181 int count; 1182 1183 loop: 1184 if ((vp->v_flag & VALIASED) == 0) 1185 return (vp->v_usecount); 1186 for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) { 1187 vnext = vq->v_specnext; 1188 if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) 1189 continue; 1190 /* 1191 * Alias, but not in use, so flush it out. 1192 */ 1193 if (vq->v_usecount == 0 && vq != vp) { 1194 vgone(vq); 1195 goto loop; 1196 } 1197 count += vq->v_usecount; 1198 } 1199 return (count); 1200 } 1201 1202 /* 1203 * Print out a description of a vnode. 1204 */ 1205 static char *typename[] = 1206 {"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"}; 1207 1208 void 1209 vprint(label, vp) 1210 char *label; 1211 register struct vnode *vp; 1212 { 1213 char buf[64]; 1214 1215 if (label != NULL) 1216 printf("%s: ", label); 1217 printf("type %s, usecount %d, writecount %d, refcount %ld,", 1218 typename[vp->v_type], vp->v_usecount, vp->v_writecount, 1219 vp->v_holdcnt); 1220 buf[0] = '\0'; 1221 if (vp->v_flag & VROOT) 1222 strcat(buf, "|VROOT"); 1223 if (vp->v_flag & VTEXT) 1224 strcat(buf, "|VTEXT"); 1225 if (vp->v_flag & VSYSTEM) 1226 strcat(buf, "|VSYSTEM"); 1227 if (vp->v_flag & VXLOCK) 1228 strcat(buf, "|VXLOCK"); 1229 if (vp->v_flag & VXWANT) 1230 strcat(buf, "|VXWANT"); 1231 if (vp->v_flag & VBWAIT) 1232 strcat(buf, "|VBWAIT"); 1233 if (vp->v_flag & VALIASED) 1234 strcat(buf, "|VALIASED"); 1235 if (buf[0] != '\0') 1236 printf(" flags (%s)", &buf[1]); 1237 if (vp->v_data == NULL) { 1238 printf("\n"); 1239 } else { 1240 printf("\n\t"); 1241 VOP_PRINT(vp); 1242 } 1243 } 1244 1245 #ifdef DDB 1246 /* 1247 * List all of the locked vnodes in the system. 1248 * Called when debugging the kernel. 1249 */ 1250 void 1251 printlockedvnodes() 1252 { 1253 register struct mount *mp; 1254 register struct vnode *vp; 1255 1256 printf("Locked vnodes\n"); 1257 for (mp = mountlist.tqh_first; mp != NULL; mp = mp->mnt_list.tqe_next) { 1258 for (vp = mp->mnt_vnodelist.lh_first; 1259 vp != NULL; 1260 vp = vp->v_mntvnodes.le_next) 1261 if (VOP_ISLOCKED(vp)) 1262 vprint((char *) 0, vp); 1263 } 1264 } 1265 #endif 1266 1267 int kinfo_vdebug = 1; 1268 int kinfo_vgetfailed; 1269 1270 #define KINFO_VNODESLOP 10 1271 /* 1272 * Dump vnode list (via sysctl). 1273 * Copyout address of vnode followed by vnode. 1274 */ 1275 /* ARGSUSED */ 1276 int 1277 sysctl_vnode(where, sizep) 1278 char *where; 1279 size_t *sizep; 1280 { 1281 register struct mount *mp, *nmp; 1282 struct vnode *vp; 1283 register char *bp = where, *savebp; 1284 char *ewhere; 1285 int error; 1286 1287 #define VPTRSZ sizeof (struct vnode *) 1288 #define VNODESZ sizeof (struct vnode) 1289 if (where == NULL) { 1290 *sizep = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); 1291 return (0); 1292 } 1293 ewhere = where + *sizep; 1294 1295 for (mp = mountlist.tqh_first; mp != NULL; mp = nmp) { 1296 nmp = mp->mnt_list.tqe_next; 1297 if (vfs_busy(mp)) 1298 continue; 1299 savebp = bp; 1300 again: 1301 for (vp = mp->mnt_vnodelist.lh_first; 1302 vp != NULL; 1303 vp = vp->v_mntvnodes.le_next) { 1304 /* 1305 * Check that the vp is still associated with this 1306 * filesystem. RACE: could have been recycled onto 1307 * the same filesystem. 1308 */ 1309 if (vp->v_mount != mp) { 1310 if (kinfo_vdebug) 1311 printf("kinfo: vp changed\n"); 1312 bp = savebp; 1313 goto again; 1314 } 1315 if (bp + VPTRSZ + VNODESZ > ewhere) { 1316 *sizep = bp - where; 1317 return (ENOMEM); 1318 } 1319 if ((error = copyout((caddr_t) &vp, bp, VPTRSZ)) || 1320 (error = copyout((caddr_t) vp, bp + VPTRSZ, VNODESZ))) 1321 return (error); 1322 bp += VPTRSZ + VNODESZ; 1323 } 1324 vfs_unbusy(mp); 1325 } 1326 1327 *sizep = bp - where; 1328 return (0); 1329 } 1330 1331 /* 1332 * Check to see if a filesystem is mounted on a block device. 1333 */ 1334 int 1335 vfs_mountedon(vp) 1336 register struct vnode *vp; 1337 { 1338 register struct vnode *vq; 1339 1340 if (vp->v_specflags & SI_MOUNTEDON) 1341 return (EBUSY); 1342 if (vp->v_flag & VALIASED) { 1343 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1344 if (vq->v_rdev != vp->v_rdev || 1345 vq->v_type != vp->v_type) 1346 continue; 1347 if (vq->v_specflags & SI_MOUNTEDON) 1348 return (EBUSY); 1349 } 1350 } 1351 return (0); 1352 } 1353 1354 /* 1355 * Build hash lists of net addresses and hang them off the mount point. 1356 * Called by ufs_mount() to set up the lists of export addresses. 1357 */ 1358 static int 1359 vfs_hang_addrlist(mp, nep, argp) 1360 struct mount *mp; 1361 struct netexport *nep; 1362 struct export_args *argp; 1363 { 1364 register struct netcred *np; 1365 register struct radix_node_head *rnh; 1366 register int i; 1367 struct radix_node *rn; 1368 struct sockaddr *saddr, *smask = 0; 1369 struct domain *dom; 1370 int error; 1371 1372 if (argp->ex_addrlen == 0) { 1373 if (mp->mnt_flag & MNT_DEFEXPORTED) 1374 return (EPERM); 1375 np = &nep->ne_defexported; 1376 np->netc_exflags = argp->ex_flags; 1377 np->netc_anon = argp->ex_anon; 1378 np->netc_anon.cr_ref = 1; 1379 mp->mnt_flag |= MNT_DEFEXPORTED; 1380 return (0); 1381 } 1382 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 1383 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK); 1384 bzero((caddr_t) np, i); 1385 saddr = (struct sockaddr *) (np + 1); 1386 if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen))) 1387 goto out; 1388 if (saddr->sa_len > argp->ex_addrlen) 1389 saddr->sa_len = argp->ex_addrlen; 1390 if (argp->ex_masklen) { 1391 smask = (struct sockaddr *) ((caddr_t) saddr + argp->ex_addrlen); 1392 error = copyin(argp->ex_addr, (caddr_t) smask, argp->ex_masklen); 1393 if (error) 1394 goto out; 1395 if (smask->sa_len > argp->ex_masklen) 1396 smask->sa_len = argp->ex_masklen; 1397 } 1398 i = saddr->sa_family; 1399 if ((rnh = nep->ne_rtable[i]) == 0) { 1400 /* 1401 * Seems silly to initialize every AF when most are not used, 1402 * do so on demand here 1403 */ 1404 for (dom = domains; dom; dom = dom->dom_next) 1405 if (dom->dom_family == i && dom->dom_rtattach) { 1406 dom->dom_rtattach((void **) &nep->ne_rtable[i], 1407 dom->dom_rtoffset); 1408 break; 1409 } 1410 if ((rnh = nep->ne_rtable[i]) == 0) { 1411 error = ENOBUFS; 1412 goto out; 1413 } 1414 } 1415 rn = (*rnh->rnh_addaddr) ((caddr_t) saddr, (caddr_t) smask, rnh, 1416 np->netc_rnodes); 1417 if (rn == 0 || np != (struct netcred *) rn) { /* already exists */ 1418 error = EPERM; 1419 goto out; 1420 } 1421 np->netc_exflags = argp->ex_flags; 1422 np->netc_anon = argp->ex_anon; 1423 np->netc_anon.cr_ref = 1; 1424 return (0); 1425 out: 1426 free(np, M_NETADDR); 1427 return (error); 1428 } 1429 1430 /* ARGSUSED */ 1431 static int 1432 vfs_free_netcred(rn, w) 1433 struct radix_node *rn; 1434 caddr_t w; 1435 { 1436 register struct radix_node_head *rnh = (struct radix_node_head *) w; 1437 1438 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh); 1439 free((caddr_t) rn, M_NETADDR); 1440 return (0); 1441 } 1442 1443 /* 1444 * Free the net address hash lists that are hanging off the mount points. 1445 */ 1446 static void 1447 vfs_free_addrlist(nep) 1448 struct netexport *nep; 1449 { 1450 register int i; 1451 register struct radix_node_head *rnh; 1452 1453 for (i = 0; i <= AF_MAX; i++) 1454 if ((rnh = nep->ne_rtable[i])) { 1455 (*rnh->rnh_walktree) (rnh, vfs_free_netcred, 1456 (caddr_t) rnh); 1457 free((caddr_t) rnh, M_RTABLE); 1458 nep->ne_rtable[i] = 0; 1459 } 1460 } 1461 1462 int 1463 vfs_export(mp, nep, argp) 1464 struct mount *mp; 1465 struct netexport *nep; 1466 struct export_args *argp; 1467 { 1468 int error; 1469 1470 if (argp->ex_flags & MNT_DELEXPORT) { 1471 vfs_free_addrlist(nep); 1472 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 1473 } 1474 if (argp->ex_flags & MNT_EXPORTED) { 1475 if ((error = vfs_hang_addrlist(mp, nep, argp))) 1476 return (error); 1477 mp->mnt_flag |= MNT_EXPORTED; 1478 } 1479 return (0); 1480 } 1481 1482 struct netcred * 1483 vfs_export_lookup(mp, nep, nam) 1484 register struct mount *mp; 1485 struct netexport *nep; 1486 struct mbuf *nam; 1487 { 1488 register struct netcred *np; 1489 register struct radix_node_head *rnh; 1490 struct sockaddr *saddr; 1491 1492 np = NULL; 1493 if (mp->mnt_flag & MNT_EXPORTED) { 1494 /* 1495 * Lookup in the export list first. 1496 */ 1497 if (nam != NULL) { 1498 saddr = mtod(nam, struct sockaddr *); 1499 rnh = nep->ne_rtable[saddr->sa_family]; 1500 if (rnh != NULL) { 1501 np = (struct netcred *) 1502 (*rnh->rnh_matchaddr) ((caddr_t) saddr, 1503 rnh); 1504 if (np && np->netc_rnodes->rn_flags & RNF_ROOT) 1505 np = NULL; 1506 } 1507 } 1508 /* 1509 * If no address match, use the default if it exists. 1510 */ 1511 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 1512 np = &nep->ne_defexported; 1513 } 1514 return (np); 1515 } 1516 1517 1518 /* 1519 * perform msync on all vnodes under a mount point 1520 * the mount point must be locked. 1521 */ 1522 void 1523 vfs_msync(struct mount *mp, int flags) { 1524 struct vnode *vp; 1525 loop: 1526 for (vp = mp->mnt_vnodelist.lh_first; 1527 vp != NULL; 1528 vp = vp->v_mntvnodes.le_next) { 1529 1530 if (vp->v_mount != mp) 1531 goto loop; 1532 if (VOP_ISLOCKED(vp) && (flags != MNT_WAIT)) 1533 continue; 1534 if (vp->v_vmdata && 1535 (((vm_object_t) vp->v_vmdata)->flags & OBJ_WRITEABLE)) { 1536 if (vget(vp, 1)) 1537 goto loop; 1538 _vm_object_page_clean( (vm_object_t) vp->v_vmdata, 1539 0, 0, TRUE); 1540 vput(vp); 1541 } 1542 } 1543 } 1544