154 if (interlkp) { 155 simple_unlock(interlkp); 156 } 157 /* 158 * Since all busy locks are shared except the exclusive 159 * lock granted when unmounting, the only place that a 160 * wakeup needs to be done is at the release of the 161 * exclusive lock at the end of dounmount. 162 */ 163 tsleep((caddr_t)mp, PVFS, "vfs_busy", 0); 164 if (interlkp) { 165 simple_lock(interlkp); 166 } 167 return (ENOENT); 168 } 169 lkflags = LK_SHARED; 170 if (interlkp) 171 lkflags |= LK_INTERLOCK; 172 if (lockmgr(&mp->mnt_lock, lkflags, interlkp, p)) 173 panic("vfs_busy: unexpected lock failure"); 174 return (0); 175} 176 177/* 178 * Free a busy filesystem. 179 */ 180void 181vfs_unbusy(mp, p) 182 struct mount *mp; 183 struct proc *p; 184{ 185 186 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, p); 187} 188 189/* 190 * Lookup a filesystem type, and if found allocate and initialize 191 * a mount structure for it. 192 * 193 * Devname is usually updated by mount(8) after booting. 194 */ 195int 196vfs_rootmountalloc(fstypename, devname, mpp) 197 char *fstypename; 198 char *devname; 199 struct mount **mpp; 200{ 201 struct proc *p = curproc; /* XXX */ 202 struct vfsconf *vfsp; 203 struct mount *mp; 204 205 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 206 if (!strcmp(vfsp->vfc_name, fstypename)) 207 break; 208 if (vfsp == NULL) 209 return (ENODEV); 210 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 211 bzero((char *)mp, (u_long)sizeof(struct mount)); 212 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 213 (void)vfs_busy(mp, LK_NOWAIT, 0, p); 214 LIST_INIT(&mp->mnt_vnodelist); 215 mp->mnt_vfc = vfsp; 216 mp->mnt_op = vfsp->vfc_vfsops; 217 mp->mnt_flag = MNT_RDONLY; 218 mp->mnt_vnodecovered = NULLVP; 219 vfsp->vfc_refcount++; 220 mp->mnt_stat.f_type = vfsp->vfc_typenum; 221 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 222 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 223 mp->mnt_stat.f_mntonname[0] = '/'; 224 mp->mnt_stat.f_mntonname[1] = 0; 225 (void) copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 0); 226 *mpp = mp; 227 return (0); 228} 229 230/* 231 * Find an appropriate filesystem to use for the root. If a filesystem 232 * has not been preselected, walk through the list of known filesystems 233 * trying those that have mountroot routines, and try them until one 234 * works or we have tried them all. 235 */ 236#ifdef notdef /* XXX JH */ 237int 238lite2_vfs_mountroot() 239{ 240 struct vfsconf *vfsp; 241 extern int (*lite2_mountroot) __P((void)); 242 int error; 243 244 if (lite2_mountroot != NULL) 245 return ((*lite2_mountroot)()); 246 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { 247 if (vfsp->vfc_mountroot == NULL) 248 continue; 249 if ((error = (*vfsp->vfc_mountroot)()) == 0) 250 return (0); 251 printf("%s_mountroot failed: %d\n", vfsp->vfc_name, error); 252 } 253 return (ENODEV); 254} 255#endif 256 257/* 258 * Lookup a mount point by filesystem identifier. 259 */ 260struct mount * 261vfs_getvfs(fsid) 262 fsid_t *fsid; 263{ 264 register struct mount *mp; 265 266 simple_lock(&mountlist_slock); 267 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; 268 mp = mp->mnt_list.cqe_next) { 269 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 270 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { 271 simple_unlock(&mountlist_slock); 272 return (mp); 273 } 274 } 275 simple_unlock(&mountlist_slock); 276 return ((struct mount *) 0); 277} 278 279/* 280 * Get a new unique fsid 281 */ 282void 283vfs_getnewfsid(mp) 284 struct mount *mp; 285{ 286 static u_short xxxfs_mntid; 287 288 fsid_t tfsid; 289 int mtype; 290 291 simple_lock(&mntid_slock); 292 mtype = mp->mnt_vfc->vfc_typenum; 293 mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0); 294 mp->mnt_stat.f_fsid.val[1] = mtype; 295 if (xxxfs_mntid == 0) 296 ++xxxfs_mntid; 297 tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid); 298 tfsid.val[1] = mtype; 299 if (mountlist.cqh_first != (void *)&mountlist) { 300 while (vfs_getvfs(&tfsid)) { 301 tfsid.val[0]++; 302 xxxfs_mntid++; 303 } 304 } 305 mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; 306 simple_unlock(&mntid_slock); 307} 308 309/* 310 * Set vnode attributes to VNOVAL 311 */ 312void 313vattr_null(vap) 314 register struct vattr *vap; 315{ 316 317 vap->va_type = VNON; 318 vap->va_size = VNOVAL; 319 vap->va_bytes = VNOVAL; 320 vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = 321 vap->va_fsid = vap->va_fileid = 322 vap->va_blocksize = vap->va_rdev = 323 vap->va_atime.tv_sec = vap->va_atime.tv_nsec = 324 vap->va_mtime.tv_sec = vap->va_mtime.tv_nsec = 325 vap->va_ctime.tv_sec = vap->va_ctime.tv_nsec = 326 vap->va_flags = vap->va_gen = VNOVAL; 327 vap->va_vaflags = 0; 328} 329 330/* 331 * Routines having to do with the management of the vnode table. 332 */ 333extern vop_t **dead_vnodeop_p; 334 335/* 336 * Return the next vnode from the free list. 337 */ 338int 339getnewvnode(tag, mp, vops, vpp) 340 enum vtagtype tag; 341 struct mount *mp; 342 vop_t **vops; 343 struct vnode **vpp; 344{ 345 struct proc *p = curproc; /* XXX */ 346 struct vnode *vp; 347 348 /* 349 * We take the least recently used vnode from the freelist 350 * if we can get it and it has no cached pages, and no 351 * namecache entries are relative to it. 352 * Otherwise we allocate a new vnode 353 */ 354 355 simple_lock(&vnode_free_list_slock); 356 357 if (wantfreevnodes && freevnodes < wantfreevnodes) { 358 vp = NULL; 359 } else if (!wantfreevnodes && freevnodes <= desiredvnodes) { 360 /* 361 * XXX: this is only here to be backwards compatible 362 */ 363 vp = NULL; 364 } else { 365 TAILQ_FOREACH(vp, &vnode_free_list, v_freelist) { 366 if (!simple_lock_try(&vp->v_interlock)) 367 continue; 368 if (vp->v_usecount) 369 panic("free vnode isn't"); 370 371 if (vp->v_object && vp->v_object->resident_page_count) { 372 /* Don't recycle if it's caching some pages */ 373 simple_unlock(&vp->v_interlock); 374 continue; 375 } else if (LIST_FIRST(&vp->v_cache_src)) { 376 /* Don't recycle if active in the namecache */ 377 simple_unlock(&vp->v_interlock); 378 continue; 379 } else { 380 break; 381 } 382 } 383 } 384 385 if (vp) { 386 vp->v_flag |= VDOOMED; 387 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 388 freevnodes--; 389 simple_unlock(&vnode_free_list_slock); 390 cache_purge(vp); 391 vp->v_lease = NULL; 392 if (vp->v_type != VBAD) 393 vgonel(vp, p); 394 else { 395 simple_unlock(&vp->v_interlock); 396 } 397 398#ifdef DIAGNOSTIC 399 { 400 int s; 401 402 if (vp->v_data) 403 panic("cleaned vnode isn't"); 404 s = splbio(); 405 if (vp->v_numoutput) 406 panic("Clean vnode has pending I/O's"); 407 splx(s); 408 } 409#endif 410 vp->v_flag = 0; 411 vp->v_lastr = 0; 412 vp->v_lastw = 0; 413 vp->v_lasta = 0; 414 vp->v_cstart = 0; 415 vp->v_clen = 0; 416 vp->v_socket = 0; 417 vp->v_writecount = 0; /* XXX */ 418 } else { 419 simple_unlock(&vnode_free_list_slock); 420 vp = (struct vnode *) malloc((u_long) sizeof *vp, 421 M_VNODE, M_WAITOK); 422 bzero((char *) vp, sizeof *vp); 423 vp->v_dd = vp; 424 cache_purge(vp); 425 LIST_INIT(&vp->v_cache_src); 426 TAILQ_INIT(&vp->v_cache_dst); 427 numvnodes++; 428 } 429 430 vp->v_type = VNON; 431 vp->v_tag = tag; 432 vp->v_op = vops; 433 insmntque(vp, mp); 434 *vpp = vp; 435 vp->v_usecount = 1; 436 vp->v_data = 0; 437 return (0); 438} 439 440/* 441 * Move a vnode from one mount queue to another. 442 */ 443void 444insmntque(vp, mp) 445 register struct vnode *vp; 446 register struct mount *mp; 447{ 448 449 simple_lock(&mntvnode_slock); 450 /* 451 * Delete from old mount point vnode list, if on one. 452 */ 453 if (vp->v_mount != NULL) 454 LIST_REMOVE(vp, v_mntvnodes); 455 /* 456 * Insert into list of vnodes for the new mount point, if available. 457 */ 458 if ((vp->v_mount = mp) == NULL) { 459 simple_unlock(&mntvnode_slock); 460 return; 461 } 462 LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes); 463 simple_unlock(&mntvnode_slock); 464} 465 466/* 467 * Update outstanding I/O count and do wakeup if requested. 468 */ 469void 470vwakeup(bp) 471 register struct buf *bp; 472{ 473 register struct vnode *vp; 474 475 bp->b_flags &= ~B_WRITEINPROG; 476 if ((vp = bp->b_vp)) { 477 vp->v_numoutput--; 478 if (vp->v_numoutput < 0) 479 panic("vwakeup: neg numoutput"); 480 if ((vp->v_numoutput == 0) && (vp->v_flag & VBWAIT)) { 481 vp->v_flag &= ~VBWAIT; 482 wakeup((caddr_t) &vp->v_numoutput); 483 } 484 } 485} 486 487/* 488 * Flush out and invalidate all buffers associated with a vnode. 489 * Called with the underlying object locked. 490 */ 491int 492vinvalbuf(vp, flags, cred, p, slpflag, slptimeo) 493 register struct vnode *vp; 494 int flags; 495 struct ucred *cred; 496 struct proc *p; 497 int slpflag, slptimeo; 498{ 499 register struct buf *bp; 500 struct buf *nbp, *blist; 501 int s, error; 502 vm_object_t object; 503 504 if (flags & V_SAVE) { 505 if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p))) 506 return (error); 507 if (vp->v_dirtyblkhd.lh_first != NULL) 508 panic("vinvalbuf: dirty bufs"); 509 } 510 511 s = splbio(); 512 for (;;) { 513 if ((blist = vp->v_cleanblkhd.lh_first) && (flags & V_SAVEMETA)) 514 while (blist && blist->b_lblkno < 0) 515 blist = blist->b_vnbufs.le_next; 516 if (!blist && (blist = vp->v_dirtyblkhd.lh_first) && 517 (flags & V_SAVEMETA)) 518 while (blist && blist->b_lblkno < 0) 519 blist = blist->b_vnbufs.le_next; 520 if (!blist) 521 break; 522 523 for (bp = blist; bp; bp = nbp) { 524 nbp = bp->b_vnbufs.le_next; 525 if ((flags & V_SAVEMETA) && bp->b_lblkno < 0) 526 continue; 527 if (bp->b_flags & B_BUSY) { 528 bp->b_flags |= B_WANTED; 529 error = tsleep((caddr_t) bp, 530 slpflag | (PRIBIO + 1), "vinvalbuf", 531 slptimeo); 532 if (error) { 533 splx(s); 534 return (error); 535 } 536 break; 537 } 538 bremfree(bp); 539 bp->b_flags |= B_BUSY; 540 /* 541 * XXX Since there are no node locks for NFS, I 542 * believe there is a slight chance that a delayed 543 * write will occur while sleeping just above, so 544 * check for it. 545 */ 546 if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { 547 (void) VOP_BWRITE(bp); 548 break; 549 } 550 bp->b_flags |= (B_INVAL|B_NOCACHE|B_RELBUF); 551 brelse(bp); 552 } 553 } 554 555 while (vp->v_numoutput > 0) { 556 vp->v_flag |= VBWAIT; 557 tsleep(&vp->v_numoutput, PVM, "vnvlbv", 0); 558 } 559 560 splx(s); 561 562 /* 563 * Destroy the copy in the VM cache, too. 564 */ 565 object = vp->v_object; 566 if (object != NULL) { 567 vm_object_page_remove(object, 0, object->size, 568 (flags & V_SAVE) ? TRUE : FALSE); 569 } 570 if (!(flags & V_SAVEMETA) && 571 (vp->v_dirtyblkhd.lh_first || vp->v_cleanblkhd.lh_first)) 572 panic("vinvalbuf: flush failed"); 573 return (0); 574} 575 576/* 577 * Associate a buffer with a vnode. 578 */ 579void 580bgetvp(vp, bp) 581 register struct vnode *vp; 582 register struct buf *bp; 583{ 584 int s; 585 586 if (bp->b_vp) 587 panic("bgetvp: not free"); 588 vhold(vp); 589 bp->b_vp = vp; 590 if (vp->v_type == VBLK || vp->v_type == VCHR) 591 bp->b_dev = vp->v_rdev; 592 else 593 bp->b_dev = NODEV; 594 /* 595 * Insert onto list for new vnode. 596 */ 597 s = splbio(); 598 bufinsvn(bp, &vp->v_cleanblkhd); 599 splx(s); 600} 601 602/* 603 * Disassociate a buffer from a vnode. 604 */ 605void 606brelvp(bp) 607 register struct buf *bp; 608{ 609 struct vnode *vp; 610 int s; 611 612 if (bp->b_vp == (struct vnode *) 0) 613 panic("brelvp: NULL"); 614 /* 615 * Delete from old vnode list, if on one. 616 */ 617 s = splbio(); 618 if (bp->b_vnbufs.le_next != NOLIST) 619 bufremvn(bp); 620 splx(s); 621 622 vp = bp->b_vp; 623 bp->b_vp = (struct vnode *) 0; 624 vdrop(vp); 625} 626 627/* 628 * Associate a p-buffer with a vnode. 629 */ 630void 631pbgetvp(vp, bp) 632 register struct vnode *vp; 633 register struct buf *bp; 634{ 635#if defined(DIAGNOSTIC) 636 if (bp->b_vp) 637 panic("pbgetvp: not free"); 638#endif 639 bp->b_vp = vp; 640 if (vp->v_type == VBLK || vp->v_type == VCHR) 641 bp->b_dev = vp->v_rdev; 642 else 643 bp->b_dev = NODEV; 644} 645 646/* 647 * Disassociate a p-buffer from a vnode. 648 */ 649void 650pbrelvp(bp) 651 register struct buf *bp; 652{ 653 654#if defined(DIAGNOSTIC) 655 if (bp->b_vp == (struct vnode *) 0) 656 panic("pbrelvp: NULL"); 657#endif 658 659 bp->b_vp = (struct vnode *) 0; 660} 661 662/* 663 * Reassign a buffer from one vnode to another. 664 * Used to assign file specific control information 665 * (indirect blocks) to the vnode to which they belong. 666 */ 667void 668reassignbuf(bp, newvp) 669 register struct buf *bp; 670 register struct vnode *newvp; 671{ 672 int s; 673 674 if (newvp == NULL) { 675 printf("reassignbuf: NULL"); 676 return; 677 } 678 679 s = splbio(); 680 /* 681 * Delete from old vnode list, if on one. 682 */ 683 if (bp->b_vnbufs.le_next != NOLIST) { 684 bufremvn(bp); 685 vdrop(bp->b_vp); 686 } 687 /* 688 * If dirty, put on list of dirty buffers; otherwise insert onto list 689 * of clean buffers. 690 */ 691 if (bp->b_flags & B_DELWRI) { 692 struct buf *tbp; 693 694 tbp = newvp->v_dirtyblkhd.lh_first; 695 if (!tbp || (tbp->b_lblkno > bp->b_lblkno)) { 696 bufinsvn(bp, &newvp->v_dirtyblkhd); 697 } else { 698 while (tbp->b_vnbufs.le_next && 699 (tbp->b_vnbufs.le_next->b_lblkno < bp->b_lblkno)) { 700 tbp = tbp->b_vnbufs.le_next; 701 } 702 LIST_INSERT_AFTER(tbp, bp, b_vnbufs); 703 } 704 } else { 705 bufinsvn(bp, &newvp->v_cleanblkhd); 706 } 707 bp->b_vp = newvp; 708 vhold(bp->b_vp); 709 splx(s); 710} 711 712#ifndef DEVFS_ROOT 713/* 714 * Create a vnode for a block device. 715 * Used for mounting the root file system. 716 */ 717int 718bdevvp(dev, vpp) 719 dev_t dev; 720 struct vnode **vpp; 721{ 722 register struct vnode *vp; 723 struct vnode *nvp; 724 int error; 725 726 if (dev == NODEV) 727 return (0); 728 error = getnewvnode(VT_NON, (struct mount *) 0, spec_vnodeop_p, &nvp); 729 if (error) { 730 *vpp = 0; 731 return (error); 732 } 733 vp = nvp; 734 vp->v_type = VBLK; 735 if ((nvp = checkalias(vp, dev, (struct mount *) 0))) { 736 vput(vp); 737 vp = nvp; 738 } 739 *vpp = vp; 740 return (0); 741} 742#endif /* !DEVFS_ROOT */ 743 744/* 745 * Check to see if the new vnode represents a special device 746 * for which we already have a vnode (either because of 747 * bdevvp() or because of a different vnode representing 748 * the same block device). If such an alias exists, deallocate 749 * the existing contents and return the aliased vnode. The 750 * caller is responsible for filling it with its new contents. 751 */ 752struct vnode * 753checkalias(nvp, nvp_rdev, mp) 754 register struct vnode *nvp; 755 dev_t nvp_rdev; 756 struct mount *mp; 757{ 758 struct proc *p = curproc; /* XXX */ 759 struct vnode *vp; 760 struct vnode **vpp; 761 762 if (nvp->v_type != VBLK && nvp->v_type != VCHR) 763 return (NULLVP); 764 765 vpp = &speclisth[SPECHASH(nvp_rdev)]; 766loop: 767 simple_lock(&spechash_slock); 768 for (vp = *vpp; vp; vp = vp->v_specnext) { 769 if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) 770 continue; 771 /* 772 * Alias, but not in use, so flush it out. 773 */ 774 simple_lock(&vp->v_interlock); 775 if (vp->v_usecount == 0) { 776 simple_unlock(&spechash_slock); 777 vgonel(vp, p); 778 goto loop; 779 } 780 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) { 781 simple_unlock(&spechash_slock); 782 goto loop; 783 } 784 break; 785 } 786 if (vp == NULL || vp->v_tag != VT_NON) { 787 MALLOC(nvp->v_specinfo, struct specinfo *, 788 sizeof(struct specinfo), M_VNODE, M_WAITOK); 789 nvp->v_rdev = nvp_rdev; 790 nvp->v_hashchain = vpp; 791 nvp->v_specnext = *vpp; 792 nvp->v_specflags = 0; 793 simple_unlock(&spechash_slock); 794 *vpp = nvp; 795 if (vp != NULLVP) { 796 nvp->v_flag |= VALIASED; 797 vp->v_flag |= VALIASED; 798 vput(vp); 799 } 800 return (NULLVP); 801 } 802 simple_unlock(&spechash_slock); 803 VOP_UNLOCK(vp, 0, p); 804 simple_lock(&vp->v_interlock); 805 vclean(vp, 0, p); 806 vp->v_op = nvp->v_op; 807 vp->v_tag = nvp->v_tag; 808 nvp->v_type = VNON; 809 insmntque(vp, mp); 810 return (vp); 811} 812 813/* 814 * Grab a particular vnode from the free list, increment its 815 * reference count and lock it. The vnode lock bit is set the 816 * vnode is being eliminated in vgone. The process is awakened 817 * when the transition is completed, and an error returned to 818 * indicate that the vnode is no longer usable (possibly having 819 * been changed to a new file system type). 820 */ 821int 822vget(vp, flags, p) 823 register struct vnode *vp; 824 int flags; 825 struct proc *p; 826{ 827 int error; 828 829 /* 830 * If the vnode is in the process of being cleaned out for 831 * another use, we wait for the cleaning to finish and then 832 * return failure. Cleaning is determined by checking that 833 * the VXLOCK flag is set. 834 */ 835 if ((flags & LK_INTERLOCK) == 0) { 836 simple_lock(&vp->v_interlock); 837 } 838 if (vp->v_flag & VXLOCK) { 839 vp->v_flag |= VXWANT; 840 simple_unlock(&vp->v_interlock); 841 tsleep((caddr_t)vp, PINOD, "vget", 0); 842 return (ENOENT); 843 } 844 vp->v_usecount++; 845 if (VSHOULDBUSY(vp)) 846 vbusy(vp); 847 /* 848 * Create the VM object, if needed 849 */ 850 if ((vp->v_type == VREG) && 851 ((vp->v_object == NULL) || 852 (vp->v_object->flags & OBJ_VFS_REF) == 0 || 853 (vp->v_object->flags & OBJ_DEAD))) { 854 /* 855 * XXX vfs_object_create probably needs the interlock. 856 */ 857 simple_unlock(&vp->v_interlock); 858 vfs_object_create(vp, curproc, curproc->p_ucred, 0); 859 simple_lock(&vp->v_interlock); 860 } 861 if (flags & LK_TYPE_MASK) { 862 if (error = vn_lock(vp, flags | LK_INTERLOCK, p)) 863 vrele(vp); 864 return (error); 865 } 866 simple_unlock(&vp->v_interlock); 867 return (0); 868} 869/* #ifdef DIAGNOSTIC */ 870/* 871 * Vnode reference, just increment the count 872 */ 873void 874vref(vp) 875 struct vnode *vp; 876{ 877 simple_lock(&vp->v_interlock); 878 if (vp->v_usecount <= 0) 879 panic("vref used where vget required"); 880 881 vp->v_usecount++; 882 883 if ((vp->v_type == VREG) && 884 ((vp->v_object == NULL) || 885 ((vp->v_object->flags & OBJ_VFS_REF) == 0) || 886 (vp->v_object->flags & OBJ_DEAD))) { 887 /* 888 * We need to lock to VP during the time that 889 * the object is created. This is necessary to 890 * keep the system from re-entrantly doing it 891 * multiple times. 892 * XXX vfs_object_create probably needs the interlock? 893 */ 894 simple_unlock(&vp->v_interlock); 895 vfs_object_create(vp, curproc, curproc->p_ucred, 0); 896 return; 897 } 898 simple_unlock(&vp->v_interlock); 899} 900 901/* 902 * Vnode put/release. 903 * If count drops to zero, call inactive routine and return to freelist. 904 */ 905static void 906vputrele(vp, put) 907 struct vnode *vp; 908 int put; 909{ 910 struct proc *p = curproc; /* XXX */ 911 912#ifdef DIAGNOSTIC 913 if (vp == NULL) 914 panic("vputrele: null vp"); 915#endif 916 simple_lock(&vp->v_interlock); 917 918 if ((vp->v_usecount == 2) && 919 vp->v_object && 920 (vp->v_object->flags & OBJ_VFS_REF)) { 921 vp->v_usecount--; 922 vp->v_object->flags &= ~OBJ_VFS_REF; 923 if (put) { 924 VOP_UNLOCK(vp, LK_INTERLOCK, p); 925 } else { 926 simple_unlock(&vp->v_interlock); 927 } 928 vm_object_deallocate(vp->v_object); 929 return; 930 } 931 932 if (vp->v_usecount > 1) { 933 vp->v_usecount--; 934 if (put) { 935 VOP_UNLOCK(vp, LK_INTERLOCK, p); 936 } else { 937 simple_unlock(&vp->v_interlock); 938 } 939 return; 940 } 941 942 if (vp->v_usecount < 1) { 943#ifdef DIAGNOSTIC 944 vprint("vputrele: negative ref count", vp); 945#endif 946 panic("vputrele: negative ref cnt"); 947 } 948 949 vp->v_usecount--; 950 if (VSHOULDFREE(vp)) 951 vfree(vp); 952 /* 953 * If we are doing a vput, the node is already locked, and we must 954 * call VOP_INACTIVE with the node locked. So, in the case of 955 * vrele, we explicitly lock the vnode before calling VOP_INACTIVE. 956 */ 957 if (put) { 958 simple_unlock(&vp->v_interlock); 959 VOP_INACTIVE(vp, p); 960 } else if (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, p) == 0) { 961 VOP_INACTIVE(vp, p); 962 } 963} 964 965/* 966 * vput(), just unlock and vrele() 967 */ 968void 969vput(vp) 970 struct vnode *vp; 971{ 972 vputrele(vp, 1); 973} 974 975void 976vrele(vp) 977 struct vnode *vp; 978{ 979 vputrele(vp, 0); 980} 981 982/* 983 * Somebody doesn't want the vnode recycled. 984 */ 985void 986vhold(vp) 987 register struct vnode *vp; 988{ 989 990 simple_lock(&vp->v_interlock); 991 vp->v_holdcnt++; 992 if (VSHOULDBUSY(vp)) 993 vbusy(vp); 994 simple_unlock(&vp->v_interlock); 995} 996 997/* 998 * One less who cares about this vnode. 999 */ 1000void 1001vdrop(vp) 1002 register struct vnode *vp; 1003{ 1004 1005 simple_lock(&vp->v_interlock); 1006 if (vp->v_holdcnt <= 0) 1007 panic("holdrele: holdcnt"); 1008 vp->v_holdcnt--; 1009 if (VSHOULDFREE(vp)) 1010 vfree(vp); 1011 simple_unlock(&vp->v_interlock); 1012} 1013 1014/* 1015 * Remove any vnodes in the vnode table belonging to mount point mp. 1016 * 1017 * If MNT_NOFORCE is specified, there should not be any active ones, 1018 * return error if any are found (nb: this is a user error, not a 1019 * system error). If MNT_FORCE is specified, detach any active vnodes 1020 * that are found. 1021 */ 1022#ifdef DIAGNOSTIC 1023static int busyprt = 0; /* print out busy vnodes */ 1024SYSCTL_INT(_debug, OID_AUTO, busyprt, CTLFLAG_RW, &busyprt, 0, ""); 1025#endif 1026 1027int 1028vflush(mp, skipvp, flags) 1029 struct mount *mp; 1030 struct vnode *skipvp; 1031 int flags; 1032{ 1033 struct proc *p = curproc; /* XXX */ 1034 struct vnode *vp, *nvp; 1035 int busy = 0; 1036 1037 simple_lock(&mntvnode_slock); 1038loop: 1039 for (vp = mp->mnt_vnodelist.lh_first; vp; vp = nvp) { 1040 /* 1041 * Make sure this vnode wasn't reclaimed in getnewvnode(). 1042 * Start over if it has (it won't be on the list anymore). 1043 */ 1044 if (vp->v_mount != mp) 1045 goto loop; 1046 nvp = vp->v_mntvnodes.le_next; 1047 /* 1048 * Skip over a selected vnode. 1049 */ 1050 if (vp == skipvp) 1051 continue; 1052 1053 simple_lock(&vp->v_interlock); 1054 /* 1055 * Skip over a vnodes marked VSYSTEM. 1056 */ 1057 if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { 1058 simple_unlock(&vp->v_interlock); 1059 continue; 1060 } 1061 /* 1062 * If WRITECLOSE is set, only flush out regular file vnodes 1063 * open for writing. 1064 */ 1065 if ((flags & WRITECLOSE) && 1066 (vp->v_writecount == 0 || vp->v_type != VREG)) { 1067 simple_unlock(&vp->v_interlock); 1068 continue; 1069 } 1070 1071 /* 1072 * With v_usecount == 0, all we need to do is clear out the 1073 * vnode data structures and we are done. 1074 */ 1075 if (vp->v_usecount == 0) { 1076 simple_unlock(&mntvnode_slock); 1077 vgonel(vp, p); 1078 simple_lock(&mntvnode_slock); 1079 continue; 1080 } 1081 1082 /* 1083 * If FORCECLOSE is set, forcibly close the vnode. For block 1084 * or character devices, revert to an anonymous device. For 1085 * all other files, just kill them. 1086 */ 1087 if (flags & FORCECLOSE) { 1088 simple_unlock(&mntvnode_slock); 1089 if (vp->v_type != VBLK && vp->v_type != VCHR) { 1090 vgonel(vp, p); 1091 } else { 1092 vclean(vp, 0, p); 1093 vp->v_op = spec_vnodeop_p; 1094 insmntque(vp, (struct mount *) 0); 1095 } 1096 simple_lock(&mntvnode_slock); 1097 continue; 1098 } 1099#ifdef DIAGNOSTIC 1100 if (busyprt) 1101 vprint("vflush: busy vnode", vp); 1102#endif 1103 simple_unlock(&vp->v_interlock); 1104 busy++; 1105 } 1106 simple_unlock(&mntvnode_slock); 1107 if (busy) 1108 return (EBUSY); 1109 return (0); 1110} 1111 1112/* 1113 * Disassociate the underlying file system from a vnode. 1114 */ 1115static void 1116vclean(vp, flags, p) 1117 struct vnode *vp; 1118 int flags; 1119 struct proc *p; 1120{ 1121 int active, irefed; 1122 vm_object_t object; 1123 1124 /* 1125 * Check to see if the vnode is in use. If so we have to reference it 1126 * before we clean it out so that its count cannot fall to zero and 1127 * generate a race against ourselves to recycle it. 1128 */ 1129 if ((active = vp->v_usecount)) 1130 vp->v_usecount++; 1131 /* 1132 * Prevent the vnode from being recycled or brought into use while we 1133 * clean it out. 1134 */ 1135 if (vp->v_flag & VXLOCK) 1136 panic("vclean: deadlock"); 1137 vp->v_flag |= VXLOCK; 1138 /* 1139 * Even if the count is zero, the VOP_INACTIVE routine may still 1140 * have the object locked while it cleans it out. The VOP_LOCK 1141 * ensures that the VOP_INACTIVE routine is done with its work. 1142 * For active vnodes, it ensures that no other activity can 1143 * occur while the underlying object is being cleaned out. 1144 */ 1145 VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK, p); 1146 1147 object = vp->v_object; 1148 irefed = 0; 1149 if (object && ((object->flags & OBJ_DEAD) == 0)) { 1150 if (object->ref_count == 0) { 1151 vm_object_reference(object); 1152 irefed = 1; 1153 } 1154 ++object->ref_count; 1155 pager_cache(object, FALSE); 1156 } 1157 1158 /* 1159 * Clean out any buffers associated with the vnode. 1160 */ 1161 if (flags & DOCLOSE) 1162 vinvalbuf(vp, V_SAVE, NOCRED, p, 0, 0); 1163 1164 if (irefed) { 1165 vm_object_deallocate(object); 1166 } 1167 1168 /* 1169 * If purging an active vnode, it must be closed and 1170 * deactivated before being reclaimed. Note that the 1171 * VOP_INACTIVE will unlock the vnode. 1172 */ 1173 if (active) { 1174 if (flags & DOCLOSE) 1175 VOP_CLOSE(vp, IO_NDELAY, NOCRED, p); 1176 VOP_INACTIVE(vp, p); 1177 } else { 1178 /* 1179 * Any other processes trying to obtain this lock must first 1180 * wait for VXLOCK to clear, then call the new lock operation. 1181 */ 1182 VOP_UNLOCK(vp, 0, p); 1183 } 1184 /* 1185 * Reclaim the vnode. 1186 */ 1187 if (VOP_RECLAIM(vp, p)) 1188 panic("vclean: cannot reclaim"); 1189 if (active) 1190 vrele(vp); 1191 cache_purge(vp); 1192 if (vp->v_vnlock) { 1193#if 0 /* This is the only place we have LK_DRAINED in the entire kernel ??? */ 1194#ifdef DIAGNOSTIC 1195 if ((vp->v_vnlock->lk_flags & LK_DRAINED) == 0) 1196 vprint("vclean: lock not drained", vp); 1197#endif 1198#endif 1199 FREE(vp->v_vnlock, M_VNODE); 1200 vp->v_vnlock = NULL; 1201 } 1202 1203 /* 1204 * Done with purge, notify sleepers of the grim news. 1205 */ 1206 vp->v_op = dead_vnodeop_p; 1207 vp->v_tag = VT_NON; 1208 vp->v_flag &= ~VXLOCK; 1209 if (vp->v_flag & VXWANT) { 1210 vp->v_flag &= ~VXWANT; 1211 wakeup((caddr_t) vp); 1212 } 1213} 1214 1215/* 1216 * Eliminate all activity associated with the requested vnode 1217 * and with all vnodes aliased to the requested vnode. 1218 */ 1219int 1220vop_revoke(ap) 1221 struct vop_revoke_args /* { 1222 struct vnode *a_vp; 1223 int a_flags; 1224 } */ *ap; 1225{ 1226 struct vnode *vp, *vq; 1227 struct proc *p = curproc; /* XXX */ 1228 1229#ifdef DIAGNOSTIC 1230 if ((ap->a_flags & REVOKEALL) == 0) 1231 panic("vop_revoke"); 1232#endif 1233 1234 vp = ap->a_vp; 1235 simple_lock(&vp->v_interlock); 1236 1237 if (vp->v_flag & VALIASED) { 1238 /* 1239 * If a vgone (or vclean) is already in progress, 1240 * wait until it is done and return. 1241 */ 1242 if (vp->v_flag & VXLOCK) { 1243 vp->v_flag |= VXWANT; 1244 simple_unlock(&vp->v_interlock); 1245 tsleep((caddr_t)vp, PINOD, "vop_revokeall", 0); 1246 return (0); 1247 } 1248 /* 1249 * Ensure that vp will not be vgone'd while we 1250 * are eliminating its aliases. 1251 */ 1252 vp->v_flag |= VXLOCK; 1253 simple_unlock(&vp->v_interlock); 1254 while (vp->v_flag & VALIASED) { 1255 simple_lock(&spechash_slock); 1256 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1257 if (vq->v_rdev != vp->v_rdev || 1258 vq->v_type != vp->v_type || vp == vq) 1259 continue; 1260 simple_unlock(&spechash_slock); 1261 vgone(vq); 1262 break; 1263 } 1264 if (vq == NULLVP) { 1265 simple_unlock(&spechash_slock); 1266 } 1267 } 1268 /* 1269 * Remove the lock so that vgone below will 1270 * really eliminate the vnode after which time 1271 * vgone will awaken any sleepers. 1272 */ 1273 simple_lock(&vp->v_interlock); 1274 vp->v_flag &= ~VXLOCK; 1275 } 1276 vgonel(vp, p); 1277 return (0); 1278} 1279 1280/* 1281 * Recycle an unused vnode to the front of the free list. 1282 * Release the passed interlock if the vnode will be recycled. 1283 */ 1284int 1285vrecycle(vp, inter_lkp, p) 1286 struct vnode *vp; 1287 struct simplelock *inter_lkp; 1288 struct proc *p; 1289{ 1290 1291 simple_lock(&vp->v_interlock); 1292 if (vp->v_usecount == 0) { 1293 if (inter_lkp) { 1294 simple_unlock(inter_lkp); 1295 } 1296 vgonel(vp, p); 1297 return (1); 1298 } 1299 simple_unlock(&vp->v_interlock); 1300 return (0); 1301} 1302 1303/* 1304 * Eliminate all activity associated with a vnode 1305 * in preparation for reuse. 1306 */ 1307void 1308vgone(vp) 1309 register struct vnode *vp; 1310{ 1311 struct proc *p = curproc; /* XXX */ 1312 1313 simple_lock(&vp->v_interlock); 1314 vgonel(vp, p); 1315} 1316 1317/* 1318 * vgone, with the vp interlock held. 1319 */ 1320static void 1321vgonel(vp, p) 1322 struct vnode *vp; 1323 struct proc *p; 1324{ 1325 struct vnode *vq; 1326 struct vnode *vx; 1327 1328 /* 1329 * If a vgone (or vclean) is already in progress, 1330 * wait until it is done and return. 1331 */ 1332 if (vp->v_flag & VXLOCK) { 1333 vp->v_flag |= VXWANT; 1334 simple_unlock(&vp->v_interlock); 1335 tsleep((caddr_t)vp, PINOD, "vgone", 0); 1336 return; 1337 } 1338 1339 if (vp->v_object) { 1340 vp->v_object->flags |= OBJ_VNODE_GONE; 1341 } 1342 1343 /* 1344 * Clean out the filesystem specific data. 1345 */ 1346 vclean(vp, DOCLOSE, p); 1347 /* 1348 * Delete from old mount point vnode list, if on one. 1349 */ 1350 if (vp->v_mount != NULL) 1351 insmntque(vp, (struct mount *)0); 1352 /* 1353 * If special device, remove it from special device alias list 1354 * if it is on one. 1355 */ 1356 if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != 0) { 1357 simple_lock(&spechash_slock); 1358 if (*vp->v_hashchain == vp) { 1359 *vp->v_hashchain = vp->v_specnext; 1360 } else { 1361 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1362 if (vq->v_specnext != vp) 1363 continue; 1364 vq->v_specnext = vp->v_specnext; 1365 break; 1366 } 1367 if (vq == NULL) 1368 panic("missing bdev"); 1369 } 1370 if (vp->v_flag & VALIASED) { 1371 vx = NULL; 1372 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1373 if (vq->v_rdev != vp->v_rdev || 1374 vq->v_type != vp->v_type) 1375 continue; 1376 if (vx) 1377 break; 1378 vx = vq; 1379 } 1380 if (vx == NULL) 1381 panic("missing alias"); 1382 if (vq == NULL) 1383 vx->v_flag &= ~VALIASED; 1384 vp->v_flag &= ~VALIASED; 1385 } 1386 simple_unlock(&spechash_slock); 1387 FREE(vp->v_specinfo, M_VNODE); 1388 vp->v_specinfo = NULL; 1389 } 1390 1391 /* 1392 * If it is on the freelist and not already at the head, 1393 * move it to the head of the list. The test of the back 1394 * pointer and the reference count of zero is because 1395 * it will be removed from the free list by getnewvnode, 1396 * but will not have its reference count incremented until 1397 * after calling vgone. If the reference count were 1398 * incremented first, vgone would (incorrectly) try to 1399 * close the previous instance of the underlying object. 1400 */ 1401 if (vp->v_usecount == 0 && !(vp->v_flag & VDOOMED)) { 1402 simple_lock(&vnode_free_list_slock); 1403 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 1404 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 1405 simple_unlock(&vnode_free_list_slock); 1406 } 1407 1408 vp->v_type = VBAD; 1409} 1410 1411/* 1412 * Lookup a vnode by device number. 1413 */ 1414int 1415vfinddev(dev, type, vpp) 1416 dev_t dev; 1417 enum vtype type; 1418 struct vnode **vpp; 1419{ 1420 register struct vnode *vp; 1421 int rc = 0; 1422 1423 simple_lock(&spechash_slock); 1424 for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { 1425 if (dev != vp->v_rdev || type != vp->v_type) 1426 continue; 1427 *vpp = vp; 1428 rc = 1; 1429 break; 1430 } 1431 simple_unlock(&spechash_slock); 1432 return (rc); 1433} 1434 1435/* 1436 * Calculate the total number of references to a special device. 1437 */ 1438int 1439vcount(vp) 1440 register struct vnode *vp; 1441{ 1442 struct vnode *vq, *vnext; 1443 int count; 1444 1445loop: 1446 if ((vp->v_flag & VALIASED) == 0) 1447 return (vp->v_usecount); 1448 simple_lock(&spechash_slock); 1449 for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) { 1450 vnext = vq->v_specnext; 1451 if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) 1452 continue; 1453 /* 1454 * Alias, but not in use, so flush it out. 1455 */ 1456 if (vq->v_usecount == 0 && vq != vp) { 1457 simple_unlock(&spechash_slock); 1458 vgone(vq); 1459 goto loop; 1460 } 1461 count += vq->v_usecount; 1462 } 1463 simple_unlock(&spechash_slock); 1464 return (count); 1465} 1466/* 1467 * Print out a description of a vnode. 1468 */ 1469static char *typename[] = 1470{"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"}; 1471 1472void 1473vprint(label, vp) 1474 char *label; 1475 register struct vnode *vp; 1476{ 1477 char buf[64]; 1478 1479 if (label != NULL) 1480 printf("%s: %x: ", label, vp); 1481 else 1482 printf("%x: ", vp); 1483 printf("type %s, usecount %d, writecount %d, refcount %ld,", 1484 typename[vp->v_type], vp->v_usecount, vp->v_writecount, 1485 vp->v_holdcnt); 1486 buf[0] = '\0'; 1487 if (vp->v_flag & VROOT) 1488 strcat(buf, "|VROOT"); 1489 if (vp->v_flag & VTEXT) 1490 strcat(buf, "|VTEXT"); 1491 if (vp->v_flag & VSYSTEM) 1492 strcat(buf, "|VSYSTEM"); 1493 if (vp->v_flag & VXLOCK) 1494 strcat(buf, "|VXLOCK"); 1495 if (vp->v_flag & VXWANT) 1496 strcat(buf, "|VXWANT"); 1497 if (vp->v_flag & VBWAIT) 1498 strcat(buf, "|VBWAIT"); 1499 if (vp->v_flag & VALIASED) 1500 strcat(buf, "|VALIASED"); 1501 if (vp->v_flag & VDOOMED) 1502 strcat(buf, "|VDOOMED"); 1503 if (vp->v_flag & VFREE) 1504 strcat(buf, "|VFREE"); 1505 if (buf[0] != '\0') 1506 printf(" flags (%s)", &buf[1]); 1507 if (vp->v_data == NULL) { 1508 printf("\n"); 1509 } else { 1510 printf("\n\t"); 1511 VOP_PRINT(vp); 1512 } 1513} 1514 1515#ifdef DDB 1516/* 1517 * List all of the locked vnodes in the system. 1518 * Called when debugging the kernel. 1519 */ 1520void 1521printlockedvnodes() 1522{ 1523 struct proc *p = curproc; /* XXX */ 1524 struct mount *mp, *nmp; 1525 struct vnode *vp; 1526 1527 printf("Locked vnodes\n"); 1528 simple_lock(&mountlist_slock); 1529 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 1530 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) { 1531 nmp = mp->mnt_list.cqe_next; 1532 continue; 1533 } 1534 for (vp = mp->mnt_vnodelist.lh_first; 1535 vp != NULL; 1536 vp = vp->v_mntvnodes.le_next) { 1537 if (VOP_ISLOCKED(vp)) 1538 vprint((char *)0, vp); 1539 } 1540 simple_lock(&mountlist_slock); 1541 nmp = mp->mnt_list.cqe_next; 1542 vfs_unbusy(mp, p); 1543 } 1544 simple_unlock(&mountlist_slock); 1545} 1546#endif 1547 1548/* 1549 * Top level filesystem related information gathering. 1550 */ 1551static int sysctl_ovfs_conf __P(SYSCTL_HANDLER_ARGS); 1552 1553static int 1554vfs_sysctl SYSCTL_HANDLER_ARGS 1555{ 1556 int *name = (int *)arg1 - 1; /* XXX */ 1557 u_int namelen = arg2 + 1; /* XXX */ 1558 struct vfsconf *vfsp; 1559 1560#ifndef NO_COMPAT_PRELITE2 1561 /* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */ 1562 if (namelen == 1) 1563 return (sysctl_ovfs_conf(oidp, arg1, arg2, req)); 1564#endif 1565 1566#ifdef notyet 1567 /* all sysctl names at this level are at least name and field */ 1568 if (namelen < 2) 1569 return (ENOTDIR); /* overloaded */ 1570 if (name[0] != VFS_GENERIC) { 1571 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 1572 if (vfsp->vfc_typenum == name[0]) 1573 break; 1574 if (vfsp == NULL) 1575 return (EOPNOTSUPP); 1576 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, 1577 oldp, oldlenp, newp, newlen, p)); 1578 } 1579#endif 1580 switch (name[1]) { 1581 case VFS_MAXTYPENUM: 1582 if (namelen != 2) 1583 return (ENOTDIR); 1584 return (SYSCTL_OUT(req, &maxvfsconf, sizeof(int))); 1585 case VFS_CONF: 1586 if (namelen != 3) 1587 return (ENOTDIR); /* overloaded */ 1588 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 1589 if (vfsp->vfc_typenum == name[2]) 1590 break; 1591 if (vfsp == NULL) 1592 return (EOPNOTSUPP); 1593 return (SYSCTL_OUT(req, vfsp, sizeof *vfsp)); 1594 } 1595 return (EOPNOTSUPP); 1596} 1597 1598SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD, vfs_sysctl, 1599 "Generic filesystem"); 1600 1601#ifndef NO_COMPAT_PRELITE2 1602 1603static int 1604sysctl_ovfs_conf SYSCTL_HANDLER_ARGS 1605{ 1606 int error; 1607 struct vfsconf *vfsp; 1608 struct ovfsconf ovfs; 1609 1610 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { 1611 ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */ 1612 strcpy(ovfs.vfc_name, vfsp->vfc_name); 1613 ovfs.vfc_index = vfsp->vfc_typenum; 1614 ovfs.vfc_refcount = vfsp->vfc_refcount; 1615 ovfs.vfc_flags = vfsp->vfc_flags; 1616 error = SYSCTL_OUT(req, &ovfs, sizeof ovfs); 1617 if (error) 1618 return error; 1619 } 1620 return 0; 1621} 1622 1623#endif /* !NO_COMPAT_PRELITE2 */ 1624 1625int kinfo_vdebug = 1; 1626int kinfo_vgetfailed; 1627 1628#if 0 1629#define KINFO_VNODESLOP 10 1630/* 1631 * Dump vnode list (via sysctl). 1632 * Copyout address of vnode followed by vnode. 1633 */ 1634/* ARGSUSED */ 1635static int 1636sysctl_vnode SYSCTL_HANDLER_ARGS 1637{ 1638 struct proc *p = curproc; /* XXX */ 1639 struct mount *mp, *nmp; 1640 struct vnode *nvp, *vp; 1641 int error; 1642 1643#define VPTRSZ sizeof (struct vnode *) 1644#define VNODESZ sizeof (struct vnode) 1645 1646 req->lock = 0; 1647 if (!req->oldptr) /* Make an estimate */ 1648 return (SYSCTL_OUT(req, 0, 1649 (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ))); 1650 1651 simple_lock(&mountlist_slock); 1652 for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { 1653 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) { 1654 nmp = mp->mnt_list.cqe_next; 1655 continue; 1656 } 1657again: 1658 simple_lock(&mntvnode_slock); 1659 for (vp = mp->mnt_vnodelist.lh_first; 1660 vp != NULL; 1661 vp = nvp) { 1662 /* 1663 * Check that the vp is still associated with 1664 * this filesystem. RACE: could have been 1665 * recycled onto the same filesystem. 1666 */ 1667 if (vp->v_mount != mp) { 1668 simple_unlock(&mntvnode_slock); 1669 if (kinfo_vdebug) 1670 printf("kinfo: vp changed\n"); 1671 goto again; 1672 } 1673 nvp = vp->v_mntvnodes.le_next; 1674 simple_unlock(&mntvnode_slock); 1675 if ((error = SYSCTL_OUT(req, &vp, VPTRSZ)) || 1676 (error = SYSCTL_OUT(req, vp, VNODESZ))) 1677 return (error); 1678 simple_lock(&mntvnode_slock); 1679 } 1680 simple_unlock(&mntvnode_slock); 1681 simple_lock(&mountlist_slock); 1682 nmp = mp->mnt_list.cqe_next; 1683 vfs_unbusy(mp, p); 1684 } 1685 simple_unlock(&mountlist_slock); 1686 1687 return (0); 1688} 1689#endif 1690 1691/* 1692 * XXX 1693 * Exporting the vnode list on large systems causes them to crash. 1694 * Exporting the vnode list on medium systems causes sysctl to coredump. 1695 */ 1696#if 0 1697SYSCTL_PROC(_kern, KERN_VNODE, vnode, CTLTYPE_OPAQUE|CTLFLAG_RD, 1698 0, 0, sysctl_vnode, "S,vnode", ""); 1699#endif 1700 1701/* 1702 * Check to see if a filesystem is mounted on a block device. 1703 */ 1704int 1705vfs_mountedon(vp) 1706 struct vnode *vp; 1707{ 1708 struct vnode *vq; 1709 int error = 0; 1710 1711 if (vp->v_specflags & SI_MOUNTEDON) 1712 return (EBUSY); 1713 if (vp->v_flag & VALIASED) { 1714 simple_lock(&spechash_slock); 1715 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1716 if (vq->v_rdev != vp->v_rdev || 1717 vq->v_type != vp->v_type) 1718 continue; 1719 if (vq->v_specflags & SI_MOUNTEDON) { 1720 error = EBUSY; 1721 break; 1722 } 1723 } 1724 simple_unlock(&spechash_slock); 1725 } 1726 return (error); 1727} 1728 1729/* 1730 * Unmount all filesystems. The list is traversed in reverse order 1731 * of mounting to avoid dependencies. 1732 */ 1733void 1734vfs_unmountall() 1735{ 1736 struct mount *mp, *nmp; 1737 struct proc *p = initproc; /* XXX XXX should this be proc0? */ 1738 int error; 1739 1740 /* 1741 * Since this only runs when rebooting, it is not interlocked. 1742 */ 1743 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 1744 nmp = mp->mnt_list.cqe_prev; 1745 error = dounmount(mp, MNT_FORCE, p); 1746 if (error) { 1747 printf("unmount of %s failed (", 1748 mp->mnt_stat.f_mntonname); 1749 if (error == EBUSY) 1750 printf("BUSY)\n"); 1751 else 1752 printf("%d)\n", error); 1753 } 1754 } 1755} 1756 1757/* 1758 * Build hash lists of net addresses and hang them off the mount point. 1759 * Called by ufs_mount() to set up the lists of export addresses. 1760 */ 1761static int 1762vfs_hang_addrlist(mp, nep, argp) 1763 struct mount *mp; 1764 struct netexport *nep; 1765 struct export_args *argp; 1766{ 1767 register struct netcred *np; 1768 register struct radix_node_head *rnh; 1769 register int i; 1770 struct radix_node *rn; 1771 struct sockaddr *saddr, *smask = 0; 1772 struct domain *dom; 1773 int error; 1774 1775 if (argp->ex_addrlen == 0) { 1776 if (mp->mnt_flag & MNT_DEFEXPORTED) 1777 return (EPERM); 1778 np = &nep->ne_defexported; 1779 np->netc_exflags = argp->ex_flags; 1780 np->netc_anon = argp->ex_anon; 1781 np->netc_anon.cr_ref = 1; 1782 mp->mnt_flag |= MNT_DEFEXPORTED; 1783 return (0); 1784 } 1785 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 1786 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK); 1787 bzero((caddr_t) np, i); 1788 saddr = (struct sockaddr *) (np + 1); 1789 if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen))) 1790 goto out; 1791 if (saddr->sa_len > argp->ex_addrlen) 1792 saddr->sa_len = argp->ex_addrlen; 1793 if (argp->ex_masklen) { 1794 smask = (struct sockaddr *) ((caddr_t) saddr + argp->ex_addrlen); 1795 error = copyin(argp->ex_mask, (caddr_t) smask, argp->ex_masklen); 1796 if (error) 1797 goto out; 1798 if (smask->sa_len > argp->ex_masklen) 1799 smask->sa_len = argp->ex_masklen; 1800 } 1801 i = saddr->sa_family; 1802 if ((rnh = nep->ne_rtable[i]) == 0) { 1803 /* 1804 * Seems silly to initialize every AF when most are not used, 1805 * do so on demand here 1806 */ 1807 for (dom = domains; dom; dom = dom->dom_next) 1808 if (dom->dom_family == i && dom->dom_rtattach) { 1809 dom->dom_rtattach((void **) &nep->ne_rtable[i], 1810 dom->dom_rtoffset); 1811 break; 1812 } 1813 if ((rnh = nep->ne_rtable[i]) == 0) { 1814 error = ENOBUFS; 1815 goto out; 1816 } 1817 } 1818 rn = (*rnh->rnh_addaddr) ((caddr_t) saddr, (caddr_t) smask, rnh, 1819 np->netc_rnodes); 1820 if (rn == 0 || np != (struct netcred *) rn) { /* already exists */ 1821 error = EPERM; 1822 goto out; 1823 } 1824 np->netc_exflags = argp->ex_flags; 1825 np->netc_anon = argp->ex_anon; 1826 np->netc_anon.cr_ref = 1; 1827 return (0); 1828out: 1829 free(np, M_NETADDR); 1830 return (error); 1831} 1832 1833/* ARGSUSED */ 1834static int 1835vfs_free_netcred(rn, w) 1836 struct radix_node *rn; 1837 void *w; 1838{ 1839 register struct radix_node_head *rnh = (struct radix_node_head *) w; 1840 1841 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh); 1842 free((caddr_t) rn, M_NETADDR); 1843 return (0); 1844} 1845 1846/* 1847 * Free the net address hash lists that are hanging off the mount points. 1848 */ 1849static void 1850vfs_free_addrlist(nep) 1851 struct netexport *nep; 1852{ 1853 register int i; 1854 register struct radix_node_head *rnh; 1855 1856 for (i = 0; i <= AF_MAX; i++) 1857 if ((rnh = nep->ne_rtable[i])) { 1858 (*rnh->rnh_walktree) (rnh, vfs_free_netcred, 1859 (caddr_t) rnh); 1860 free((caddr_t) rnh, M_RTABLE); 1861 nep->ne_rtable[i] = 0; 1862 } 1863} 1864 1865int 1866vfs_export(mp, nep, argp) 1867 struct mount *mp; 1868 struct netexport *nep; 1869 struct export_args *argp; 1870{ 1871 int error; 1872 1873 if (argp->ex_flags & MNT_DELEXPORT) { 1874 if (mp->mnt_flag & MNT_EXPUBLIC) { 1875 vfs_setpublicfs(NULL, NULL, NULL); 1876 mp->mnt_flag &= ~MNT_EXPUBLIC; 1877 } 1878 vfs_free_addrlist(nep); 1879 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 1880 } 1881 if (argp->ex_flags & MNT_EXPORTED) { 1882 if (argp->ex_flags & MNT_EXPUBLIC) { 1883 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0) 1884 return (error); 1885 mp->mnt_flag |= MNT_EXPUBLIC; 1886 } 1887 if ((error = vfs_hang_addrlist(mp, nep, argp))) 1888 return (error); 1889 mp->mnt_flag |= MNT_EXPORTED; 1890 } 1891 return (0); 1892} 1893 1894 1895/* 1896 * Set the publicly exported filesystem (WebNFS). Currently, only 1897 * one public filesystem is possible in the spec (RFC 2054 and 2055) 1898 */ 1899int 1900vfs_setpublicfs(mp, nep, argp) 1901 struct mount *mp; 1902 struct netexport *nep; 1903 struct export_args *argp; 1904{ 1905 int error; 1906 struct vnode *rvp; 1907 char *cp; 1908 1909 /* 1910 * mp == NULL -> invalidate the current info, the FS is 1911 * no longer exported. May be called from either vfs_export 1912 * or unmount, so check if it hasn't already been done. 1913 */ 1914 if (mp == NULL) { 1915 if (nfs_pub.np_valid) { 1916 nfs_pub.np_valid = 0; 1917 if (nfs_pub.np_index != NULL) { 1918 FREE(nfs_pub.np_index, M_TEMP); 1919 nfs_pub.np_index = NULL; 1920 } 1921 } 1922 return (0); 1923 } 1924 1925 /* 1926 * Only one allowed at a time. 1927 */ 1928 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) 1929 return (EBUSY); 1930 1931 /* 1932 * Get real filehandle for root of exported FS. 1933 */ 1934 bzero((caddr_t)&nfs_pub.np_handle, sizeof(nfs_pub.np_handle)); 1935 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid; 1936 1937 if ((error = VFS_ROOT(mp, &rvp))) 1938 return (error); 1939 1940 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) 1941 return (error); 1942 1943 vput(rvp); 1944 1945 /* 1946 * If an indexfile was specified, pull it in. 1947 */ 1948 if (argp->ex_indexfile != NULL) { 1949 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, 1950 M_WAITOK); 1951 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, 1952 MAXNAMLEN, (size_t *)0); 1953 if (!error) { 1954 /* 1955 * Check for illegal filenames. 1956 */ 1957 for (cp = nfs_pub.np_index; *cp; cp++) { 1958 if (*cp == '/') { 1959 error = EINVAL; 1960 break; 1961 } 1962 } 1963 } 1964 if (error) { 1965 FREE(nfs_pub.np_index, M_TEMP); 1966 return (error); 1967 } 1968 } 1969 1970 nfs_pub.np_mount = mp; 1971 nfs_pub.np_valid = 1; 1972 return (0); 1973} 1974 1975struct netcred * 1976vfs_export_lookup(mp, nep, nam) 1977 register struct mount *mp; 1978 struct netexport *nep; 1979 struct sockaddr *nam; 1980{ 1981 register struct netcred *np; 1982 register struct radix_node_head *rnh; 1983 struct sockaddr *saddr; 1984 1985 np = NULL; 1986 if (mp->mnt_flag & MNT_EXPORTED) { 1987 /* 1988 * Lookup in the export list first. 1989 */ 1990 if (nam != NULL) { 1991 saddr = nam; 1992 rnh = nep->ne_rtable[saddr->sa_family]; 1993 if (rnh != NULL) { 1994 np = (struct netcred *) 1995 (*rnh->rnh_matchaddr)((caddr_t)saddr, 1996 rnh); 1997 if (np && np->netc_rnodes->rn_flags & RNF_ROOT) 1998 np = NULL; 1999 } 2000 } 2001 /* 2002 * If no address match, use the default if it exists. 2003 */ 2004 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 2005 np = &nep->ne_defexported; 2006 } 2007 return (np); 2008} 2009 2010/* 2011 * perform msync on all vnodes under a mount point 2012 * the mount point must be locked. 2013 */ 2014void 2015vfs_msync(struct mount *mp, int flags) { 2016 struct vnode *vp, *nvp; 2017loop: 2018 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 2019 2020 if (vp->v_mount != mp) 2021 goto loop; 2022 nvp = vp->v_mntvnodes.le_next; 2023 if (VOP_ISLOCKED(vp) && (flags != MNT_WAIT)) 2024 continue; 2025 if (vp->v_object && 2026 (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) { 2027 vm_object_page_clean(vp->v_object, 0, 0, TRUE, TRUE); 2028 } 2029 } 2030} 2031 2032/* 2033 * Create the VM object needed for VMIO and mmap support. This 2034 * is done for all VREG files in the system. Some filesystems might 2035 * afford the additional metadata buffering capability of the 2036 * VMIO code by making the device node be VMIO mode also. 2037 */ 2038int 2039vfs_object_create(vp, p, cred, waslocked) 2040 struct vnode *vp; 2041 struct proc *p; 2042 struct ucred *cred; 2043 int waslocked; 2044{ 2045 struct vattr vat; 2046 vm_object_t object; 2047 int error = 0; 2048 2049retry: 2050 if ((object = vp->v_object) == NULL) { 2051 if (vp->v_type == VREG) { 2052 if ((error = VOP_GETATTR(vp, &vat, cred, p)) != 0) 2053 goto retn; 2054 (void) vnode_pager_alloc(vp, 2055 OFF_TO_IDX(round_page(vat.va_size)), 0, 0); 2056 } else { 2057 /* 2058 * This simply allocates the biggest object possible 2059 * for a VBLK vnode. This should be fixed, but doesn't 2060 * cause any problems (yet). 2061 */ 2062 (void) vnode_pager_alloc(vp, INT_MAX, 0, 0); 2063 } 2064 vp->v_object->flags |= OBJ_VFS_REF; 2065 } else { 2066 if (object->flags & OBJ_DEAD) { 2067 if (waslocked) 2068 VOP_UNLOCK(vp, 0, p); 2069 tsleep(object, PVM, "vodead", 0); 2070 if (waslocked) 2071 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 2072 goto retry; 2073 } 2074 if ((object->flags & OBJ_VFS_REF) == 0) { 2075 object->flags |= OBJ_VFS_REF; 2076 vm_object_reference(object); 2077 } 2078 } 2079 if (vp->v_object) 2080 vp->v_flag |= VVMIO; 2081 2082retn: 2083 return error; 2084} 2085 2086void 2087vfree(vp) 2088 struct vnode *vp; 2089{ 2090 simple_lock(&vnode_free_list_slock); 2091 if (vp->v_flag & VAGE) { 2092 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 2093 } else { 2094 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 2095 } 2096 freevnodes++; 2097 simple_unlock(&vnode_free_list_slock); 2098 vp->v_flag &= ~VAGE; 2099 vp->v_flag |= VFREE; 2100} 2101 2102void 2103vbusy(vp) 2104 struct vnode *vp; 2105{ 2106 simple_lock(&vnode_free_list_slock); 2107 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 2108 freevnodes--; 2109 simple_unlock(&vnode_free_list_slock); 2110 vp->v_flag &= ~VFREE; 2111}
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