+ * Routines having to do with the management of the vnode table.
+ */
+extern struct vnode *vfreeh, **vfreet;
+extern struct vnodeops dead_vnodeops;
+extern struct vnodeops spec_vnodeops;
+extern void vclean();
+long numvnodes;
+extern struct vattr va_null;
+
+/*
+ * Return the next vnode from the free list.
+ */
+getnewvnode(tag, mp, vops, vpp)
+ enum vtagtype tag;
+ struct mount *mp;
+ struct vnodeops *vops;
+ struct vnode **vpp;
+{
+ register struct vnode *vp, *vq;
+
+ if (numvnodes < desiredvnodes) {
+ vp = (struct vnode *)malloc((u_long)sizeof *vp,
+ M_VNODE, M_WAITOK);
+ bzero((char *)vp, sizeof *vp);
+ numvnodes++;
+ } else {
+ if ((vp = vfreeh) == NULL) {
+ tablefull("vnode");
+ *vpp = 0;
+ return (ENFILE);
+ }
+ if (vp->v_usecount)
+ panic("free vnode isn't");
+ if (vq = vp->v_freef)
+ vq->v_freeb = &vfreeh;
+ else
+ vfreet = &vfreeh;
+ vfreeh = vq;
+ vp->v_freef = NULL;
+ vp->v_freeb = NULL;
+ vp->v_lease = NULL;
+ if (vp->v_type != VBAD)
+ vgone(vp);
+ if (vp->v_data)
+ panic("cleaned vnode isn't");
+ vp->v_flag = 0;
+ vp->v_lastr = 0;
+ vp->v_socket = 0;
+ }
+ vp->v_type = VNON;
+ cache_purge(vp);
+ vp->v_tag = tag;
+ vp->v_op = vops;
+ insmntque(vp, mp);
+ VREF(vp);
+ *vpp = vp;
+ return (0);
+}
+
+/*
+ * Move a vnode from one mount queue to another.
+ */
+insmntque(vp, mp)
+ register struct vnode *vp;
+ register struct mount *mp;
+{
+ register struct vnode *vq;
+
+ /*
+ * Delete from old mount point vnode list, if on one.
+ */
+ if (vp->v_mountb) {
+ if (vq = vp->v_mountf)
+ vq->v_mountb = vp->v_mountb;
+ *vp->v_mountb = vq;
+ }
+ /*
+ * Insert into list of vnodes for the new mount point, if available.
+ */
+ vp->v_mount = mp;
+ if (mp == NULL) {
+ vp->v_mountf = NULL;
+ vp->v_mountb = NULL;
+ return;
+ }
+ if (vq = mp->mnt_mounth)
+ vq->v_mountb = &vp->v_mountf;
+ vp->v_mountf = vq;
+ vp->v_mountb = &mp->mnt_mounth;
+ mp->mnt_mounth = vp;
+}
+
+/*
+ * Make sure all write-behind blocks associated
+ * with mount point are flushed out (from sync).
+ */
+mntflushbuf(mountp, flags)
+ struct mount *mountp;
+ int flags;
+{
+ register struct vnode *vp;
+
+ if ((mountp->mnt_flag & MNT_MPBUSY) == 0)
+ panic("mntflushbuf: not busy");
+loop:
+ for (vp = mountp->mnt_mounth; vp; vp = vp->v_mountf) {
+ if (VOP_ISLOCKED(vp))
+ continue;
+ if (vget(vp))
+ goto loop;
+ vflushbuf(vp, flags);
+ vput(vp);
+ if (vp->v_mount != mountp)
+ goto loop;
+ }
+}
+
+/*
+ * Flush all dirty buffers associated with a vnode.
+ */
+vflushbuf(vp, flags)
+ register struct vnode *vp;
+ int flags;
+{
+ register struct buf *bp;
+ struct buf *nbp;
+ int s;
+
+loop:
+ s = splbio();
+ for (bp = vp->v_dirtyblkhd; bp; bp = nbp) {
+ nbp = bp->b_blockf;
+ if ((bp->b_flags & B_BUSY))
+ continue;
+ if ((bp->b_flags & B_DELWRI) == 0)
+ panic("vflushbuf: not dirty");
+ bremfree(bp);
+ bp->b_flags |= B_BUSY;
+ splx(s);
+ /*
+ * Wait for I/O associated with indirect blocks to complete,
+ * since there is no way to quickly wait for them below.
+ * NB: This is really specific to ufs, but is done here
+ * as it is easier and quicker.
+ */
+ if (bp->b_vp == vp || (flags & B_SYNC) == 0)
+ (void) bawrite(bp);
+ else
+ (void) bwrite(bp);
+ goto loop;
+ }
+ splx(s);
+ if ((flags & B_SYNC) == 0)
+ return;
+ s = splbio();
+ while (vp->v_numoutput) {
+ vp->v_flag |= VBWAIT;
+ sleep((caddr_t)&vp->v_numoutput, PRIBIO + 1);
+ }
+ splx(s);
+ if (vp->v_dirtyblkhd) {
+ vprint("vflushbuf: dirty", vp);
+ goto loop;
+ }
+}
+
+/*
+ * Update outstanding I/O count and do wakeup if requested.
+ */
+vwakeup(bp)
+ register struct buf *bp;
+{
+ register struct vnode *vp;
+
+ bp->b_dirtyoff = bp->b_dirtyend = 0;
+ if (vp = bp->b_vp) {
+ vp->v_numoutput--;
+ if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) {
+ if (vp->v_numoutput < 0)
+ panic("vwakeup: neg numoutput");
+ vp->v_flag &= ~VBWAIT;
+ wakeup((caddr_t)&vp->v_numoutput);
+ }
+ }
+}
+
+/*
+ * Invalidate in core blocks belonging to closed or umounted filesystem
+ *
+ * Go through the list of vnodes associated with the file system;
+ * for each vnode invalidate any buffers that it holds. Normally
+ * this routine is preceeded by a bflush call, so that on a quiescent
+ * filesystem there will be no dirty buffers when we are done. Binval
+ * returns the count of dirty buffers when it is finished.
+ */
+mntinvalbuf(mountp)
+ struct mount *mountp;
+{
+ register struct vnode *vp;
+ int dirty = 0;
+
+ if ((mountp->mnt_flag & MNT_MPBUSY) == 0)
+ panic("mntinvalbuf: not busy");
+loop:
+ for (vp = mountp->mnt_mounth; vp; vp = vp->v_mountf) {
+ if (vget(vp))
+ goto loop;
+ dirty += vinvalbuf(vp, 1);
+ vput(vp);
+ if (vp->v_mount != mountp)
+ goto loop;
+ }
+ return (dirty);
+}
+
+/*
+ * Flush out and invalidate all buffers associated with a vnode.
+ * Called with the underlying object locked.
+ */
+vinvalbuf(vp, save)
+ register struct vnode *vp;
+ int save;
+{
+ register struct buf *bp;
+ struct buf *nbp, *blist;
+ int s, dirty = 0;
+
+ for (;;) {
+ if (blist = vp->v_dirtyblkhd)
+ /* void */;
+ else if (blist = vp->v_cleanblkhd)
+ /* void */;
+ else
+ break;
+ for (bp = blist; bp; bp = nbp) {
+ nbp = bp->b_blockf;
+ s = splbio();
+ if (bp->b_flags & B_BUSY) {
+ bp->b_flags |= B_WANTED;
+ sleep((caddr_t)bp, PRIBIO + 1);
+ splx(s);
+ break;
+ }
+ bremfree(bp);
+ bp->b_flags |= B_BUSY;
+ splx(s);
+ if (save && (bp->b_flags & B_DELWRI)) {
+ dirty++;
+ (void) VOP_BWRITE(bp);
+ break;
+ }
+ if (bp->b_vp != vp)
+ reassignbuf(bp, bp->b_vp);
+ else
+ bp->b_flags |= B_INVAL;
+ brelse(bp);
+ }
+ }
+ if (vp->v_dirtyblkhd || vp->v_cleanblkhd)
+ panic("vinvalbuf: flush failed");
+ return (dirty);
+}
+
+/*
+ * Associate a buffer with a vnode.
+ */
+bgetvp(vp, bp)
+ register struct vnode *vp;
+ register struct buf *bp;
+{
+ register struct vnode *vq;
+ register struct buf *bq;
+
+ if (bp->b_vp)
+ panic("bgetvp: not free");
+ VHOLD(vp);
+ bp->b_vp = vp;
+ if (vp->v_type == VBLK || vp->v_type == VCHR)
+ bp->b_dev = vp->v_rdev;
+ else
+ bp->b_dev = NODEV;
+ /*
+ * Insert onto list for new vnode.
+ */
+ if (bq = vp->v_cleanblkhd)
+ bq->b_blockb = &bp->b_blockf;
+ bp->b_blockf = bq;
+ bp->b_blockb = &vp->v_cleanblkhd;
+ vp->v_cleanblkhd = bp;
+}
+
+/*
+ * Disassociate a buffer from a vnode.
+ */
+brelvp(bp)
+ register struct buf *bp;
+{
+ struct buf *bq;
+ struct vnode *vp;
+
+ if (bp->b_vp == (struct vnode *) 0)
+ panic("brelvp: NULL");
+ /*
+ * Delete from old vnode list, if on one.
+ */
+ if (bp->b_blockb) {
+ if (bq = bp->b_blockf)
+ bq->b_blockb = bp->b_blockb;
+ *bp->b_blockb = bq;
+ bp->b_blockf = NULL;
+ bp->b_blockb = NULL;
+ }
+ vp = bp->b_vp;
+ bp->b_vp = (struct vnode *) 0;
+ HOLDRELE(vp);
+}
+
+/*
+ * Reassign a buffer from one vnode to another.
+ * Used to assign file specific control information
+ * (indirect blocks) to the vnode to which they belong.
+ */
+reassignbuf(bp, newvp)
+ register struct buf *bp;
+ register struct vnode *newvp;
+{
+ register struct buf *bq, **listheadp;
+
+ if (newvp == NULL) {
+ printf("reassignbuf: NULL");
+ return;
+ }
+ /*
+ * Delete from old vnode list, if on one.
+ */
+ if (bp->b_blockb) {
+ if (bq = bp->b_blockf)
+ bq->b_blockb = bp->b_blockb;
+ *bp->b_blockb = bq;
+ }
+ /*
+ * If dirty, put on list of dirty buffers;
+ * otherwise insert onto list of clean buffers.
+ */
+ if (bp->b_flags & B_DELWRI)
+ listheadp = &newvp->v_dirtyblkhd;
+ else
+ listheadp = &newvp->v_cleanblkhd;
+ if (bq = *listheadp)
+ bq->b_blockb = &bp->b_blockf;
+ bp->b_blockf = bq;
+ bp->b_blockb = listheadp;
+ *listheadp = bp;
+}
+
+/*
+ * Create a vnode for a block device.
+ * Used for root filesystem, argdev, and swap areas.
+ * Also used for memory file system special devices.
+ */
+bdevvp(dev, vpp)
+ dev_t dev;
+ struct vnode **vpp;
+{
+ register struct vnode *vp;
+ struct vnode *nvp;
+ int error;
+
+ if (dev == NODEV)
+ return (0);
+ error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp);
+ if (error) {
+ *vpp = 0;
+ return (error);
+ }
+ vp = nvp;
+ vp->v_type = VBLK;
+ if (nvp = checkalias(vp, dev, (struct mount *)0)) {
+ vput(vp);
+ vp = nvp;
+ }
+ *vpp = vp;
+ return (0);
+}
+
+/*
+ * Check to see if the new vnode represents a special device
+ * for which we already have a vnode (either because of
+ * bdevvp() or because of a different vnode representing
+ * the same block device). If such an alias exists, deallocate
+ * the existing contents and return the aliased vnode. The
+ * caller is responsible for filling it with its new contents.
+ */
+struct vnode *
+checkalias(nvp, nvp_rdev, mp)
+ register struct vnode *nvp;
+ dev_t nvp_rdev;
+ struct mount *mp;
+{
+ register struct vnode *vp;
+ struct vnode **vpp;
+
+ if (nvp->v_type != VBLK && nvp->v_type != VCHR)
+ return (NULLVP);
+
+ vpp = &speclisth[SPECHASH(nvp_rdev)];
+loop:
+ for (vp = *vpp; vp; vp = vp->v_specnext) {
+ if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type)
+ continue;
+ /*
+ * Alias, but not in use, so flush it out.
+ */
+ if (vp->v_usecount == 0) {
+ vgone(vp);
+ goto loop;
+ }
+ if (vget(vp))
+ goto loop;
+ break;
+ }
+ if (vp == NULL || vp->v_tag != VT_NON) {
+ MALLOC(nvp->v_specinfo, struct specinfo *,
+ sizeof(struct specinfo), M_VNODE, M_WAITOK);
+ nvp->v_rdev = nvp_rdev;
+ nvp->v_hashchain = vpp;
+ nvp->v_specnext = *vpp;
+ nvp->v_specflags = 0;
+ *vpp = nvp;
+ if (vp != NULL) {
+ nvp->v_flag |= VALIASED;
+ vp->v_flag |= VALIASED;
+ vput(vp);
+ }
+ return (NULLVP);
+ }
+ VOP_UNLOCK(vp);
+ vclean(vp, 0);
+ vp->v_op = nvp->v_op;
+ vp->v_tag = nvp->v_tag;
+ nvp->v_type = VNON;
+ insmntque(vp, mp);
+ return (vp);
+}
+
+/*
+ * Grab a particular vnode from the free list, increment its
+ * reference count and lock it. The vnode lock bit is set the
+ * vnode is being eliminated in vgone. The process is awakened
+ * when the transition is completed, and an error returned to
+ * indicate that the vnode is no longer usable (possibly having
+ * been changed to a new file system type).
+ */
+vget(vp)
+ register struct vnode *vp;
+{
+ register struct vnode *vq;
+
+ if (vp->v_flag & VXLOCK) {
+ vp->v_flag |= VXWANT;
+ sleep((caddr_t)vp, PINOD);
+ return (1);
+ }
+ if (vp->v_usecount == 0) {
+ if (vq = vp->v_freef)
+ vq->v_freeb = vp->v_freeb;
+ else
+ vfreet = vp->v_freeb;
+ *vp->v_freeb = vq;
+ vp->v_freef = NULL;
+ vp->v_freeb = NULL;
+ }
+ VREF(vp);
+ VOP_LOCK(vp);
+ return (0);
+}
+
+int bug_refs = 0;
+
+/*
+ * Vnode reference, just increment the count
+ */
+void vref(vp)
+ struct vnode *vp;
+{
+
+ vp->v_usecount++;
+ if (vp->v_type != VBLK && curproc)
+ curproc->p_spare[0]++;
+ if (bug_refs)
+ vprint("vref: ");
+}
+
+/*
+ * vput(), just unlock and vrele()
+ */
+void vput(vp)
+ register struct vnode *vp;
+{
+
+ VOP_UNLOCK(vp);
+ vrele(vp);
+}
+
+/*
+ * Vnode release.
+ * If count drops to zero, call inactive routine and return to freelist.
+ */
+void vrele(vp)
+ register struct vnode *vp;
+{
+ struct proc *p = curproc; /* XXX */
+
+#ifdef DIAGNOSTIC
+ if (vp == NULL)
+ panic("vrele: null vp");
+#endif
+ vp->v_usecount--;
+ if (vp->v_type != VBLK && curproc)
+ curproc->p_spare[0]--;
+ if (bug_refs)
+ vprint("vref: ");
+ if (vp->v_usecount > 0)
+ return;
+#ifdef DIAGNOSTIC
+ if (vp->v_usecount != 0 || vp->v_writecount != 0) {
+ vprint("vrele: bad ref count", vp);
+ panic("vrele: ref cnt");
+ }
+#endif
+ if (vfreeh == NULLVP) {
+ /*
+ * insert into empty list
+ */
+ vfreeh = vp;
+ vp->v_freeb = &vfreeh;
+ } else {
+ /*
+ * insert at tail of list
+ */
+ *vfreet = vp;
+ vp->v_freeb = vfreet;
+ }
+ vp->v_freef = NULL;
+ vfreet = &vp->v_freef;
+ VOP_INACTIVE(vp, p);
+}
+
+/*
+ * Page or buffer structure gets a reference.
+ */
+void vhold(vp)
+ register struct vnode *vp;
+{
+
+ vp->v_holdcnt++;
+}
+
+/*
+ * Page or buffer structure frees a reference.
+ */
+void holdrele(vp)
+ register struct vnode *vp;
+{
+
+ if (vp->v_holdcnt <= 0)
+ panic("holdrele: holdcnt");
+ vp->v_holdcnt--;
+}
+
+/*
+ * Remove any vnodes in the vnode table belonging to mount point mp.
+ *
+ * If MNT_NOFORCE is specified, there should not be any active ones,
+ * return error if any are found (nb: this is a user error, not a
+ * system error). If MNT_FORCE is specified, detach any active vnodes
+ * that are found.
+ */
+int busyprt = 0; /* patch to print out busy vnodes */
+
+vflush(mp, skipvp, flags)
+ struct mount *mp;
+ struct vnode *skipvp;
+ int flags;
+{
+ register struct vnode *vp, *nvp;
+ int busy = 0;
+
+ if ((mp->mnt_flag & MNT_MPBUSY) == 0)
+ panic("vflush: not busy");
+loop:
+ for (vp = mp->mnt_mounth; vp; vp = nvp) {
+ if (vp->v_mount != mp)
+ goto loop;
+ nvp = vp->v_mountf;
+ /*
+ * Skip over a selected vnode.
+ */
+ if (vp == skipvp)
+ continue;
+ /*
+ * Skip over a vnodes marked VSYSTEM.
+ */
+ if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM))
+ continue;
+ /*
+ * With v_usecount == 0, all we need to do is clear
+ * out the vnode data structures and we are done.
+ */
+ if (vp->v_usecount == 0) {
+ vgone(vp);
+ continue;
+ }
+ /*
+ * For block or character devices, revert to an
+ * anonymous device. For all other files, just kill them.
+ */
+ if (flags & FORCECLOSE) {
+ if (vp->v_type != VBLK && vp->v_type != VCHR) {
+ vgone(vp);
+ } else {
+ vclean(vp, 0);
+ vp->v_op = &spec_vnodeops;
+ insmntque(vp, (struct mount *)0);
+ }
+ continue;
+ }
+ if (busyprt)
+ vprint("vflush: busy vnode", vp);
+ busy++;
+ }
+ if (busy)
+ return (EBUSY);
+ return (0);
+}
+
+/*
+ * Disassociate the underlying file system from a vnode.
+ */
+void vclean(vp, flags)
+ register struct vnode *vp;
+ int flags;
+{
+ struct vnodeops *origops;
+ int active;
+ struct proc *p = curproc; /* XXX */
+
+ /*
+ * Check to see if the vnode is in use.
+ * If so we have to reference it before we clean it out
+ * so that its count cannot fall to zero and generate a
+ * race against ourselves to recycle it.
+ */
+ if (active = vp->v_usecount)
+ VREF(vp);
+ /*
+ * Prevent the vnode from being recycled or
+ * brought into use while we clean it out.
+ */
+ if (vp->v_flag & VXLOCK)
+ panic("vclean: deadlock");
+ vp->v_flag |= VXLOCK;
+ /*
+ * Even if the count is zero, the VOP_INACTIVE routine may still
+ * have the object locked while it cleans it out. The VOP_LOCK
+ * ensures that the VOP_INACTIVE routine is done with its work.
+ * For active vnodes, it ensures that no other activity can
+ * occur while the buffer list is being cleaned out.
+ */
+ VOP_LOCK(vp);
+ if (flags & DOCLOSE)
+ vinvalbuf(vp, 1);
+ /*
+ * Prevent any further operations on the vnode from
+ * being passed through to the old file system.
+ */
+ origops = vp->v_op;
+ vp->v_op = &dead_vnodeops;
+ vp->v_tag = VT_NON;
+ /*
+ * If purging an active vnode, it must be unlocked, closed,
+ * and deactivated before being reclaimed.
+ */
+ (*(origops->vop_unlock))(vp);
+ if (active) {
+ if (flags & DOCLOSE)
+ (*(origops->vop_close))(vp, IO_NDELAY, NOCRED, p);
+ (*(origops->vop_inactive))(vp, p);
+ }
+ /*
+ * Reclaim the vnode.
+ */
+ if ((*(origops->vop_reclaim))(vp))
+ panic("vclean: cannot reclaim");
+ if (active)
+ vrele(vp);
+ /*
+ * Done with purge, notify sleepers in vget of the grim news.
+ */
+ vp->v_flag &= ~VXLOCK;
+ if (vp->v_flag & VXWANT) {
+ vp->v_flag &= ~VXWANT;
+ wakeup((caddr_t)vp);
+ }
+}
+
+/*
+ * Eliminate all activity associated with the requested vnode
+ * and with all vnodes aliased to the requested vnode.
+ */
+void vgoneall(vp)
+ register struct vnode *vp;
+{
+ register struct vnode *vq;
+
+ if (vp->v_flag & VALIASED) {
+ /*
+ * If a vgone (or vclean) is already in progress,
+ * wait until it is done and return.
+ */
+ if (vp->v_flag & VXLOCK) {
+ vp->v_flag |= VXWANT;
+ sleep((caddr_t)vp, PINOD);
+ return;
+ }
+ /*
+ * Ensure that vp will not be vgone'd while we
+ * are eliminating its aliases.
+ */
+ vp->v_flag |= VXLOCK;
+ while (vp->v_flag & VALIASED) {
+ for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
+ if (vq->v_rdev != vp->v_rdev ||
+ vq->v_type != vp->v_type || vp == vq)
+ continue;
+ vgone(vq);
+ break;
+ }
+ }
+ /*
+ * Remove the lock so that vgone below will
+ * really eliminate the vnode after which time
+ * vgone will awaken any sleepers.
+ */
+ vp->v_flag &= ~VXLOCK;
+ }
+ vgone(vp);
+}
+
+/*
+ * Eliminate all activity associated with a vnode
+ * in preparation for reuse.
+ */
+void vgone(vp)
+ register struct vnode *vp;
+{
+ register struct vnode *vq;
+ struct vnode *vx;
+
+ /*
+ * If a vgone (or vclean) is already in progress,
+ * wait until it is done and return.
+ */
+ if (vp->v_flag & VXLOCK) {
+ vp->v_flag |= VXWANT;
+ sleep((caddr_t)vp, PINOD);
+ return;
+ }
+ /*
+ * Clean out the filesystem specific data.
+ */
+ vclean(vp, DOCLOSE);
+ /*
+ * Delete from old mount point vnode list, if on one.
+ */
+ if (vp->v_mountb) {
+ if (vq = vp->v_mountf)
+ vq->v_mountb = vp->v_mountb;
+ *vp->v_mountb = vq;
+ vp->v_mountf = NULL;
+ vp->v_mountb = NULL;
+ vp->v_mount = NULL;
+ }
+ /*
+ * If special device, remove it from special device alias list.
+ */
+ if (vp->v_type == VBLK || vp->v_type == VCHR) {
+ if (*vp->v_hashchain == vp) {
+ *vp->v_hashchain = vp->v_specnext;
+ } else {
+ for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
+ if (vq->v_specnext != vp)
+ continue;
+ vq->v_specnext = vp->v_specnext;
+ break;
+ }
+ if (vq == NULL)
+ panic("missing bdev");
+ }
+ if (vp->v_flag & VALIASED) {
+ vx = NULL;
+ for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
+ if (vq->v_rdev != vp->v_rdev ||
+ vq->v_type != vp->v_type)
+ continue;
+ if (vx)
+ break;
+ vx = vq;
+ }
+ if (vx == NULL)
+ panic("missing alias");
+ if (vq == NULL)
+ vx->v_flag &= ~VALIASED;
+ vp->v_flag &= ~VALIASED;
+ }
+ FREE(vp->v_specinfo, M_VNODE);
+ vp->v_specinfo = NULL;
+ }
+ /*
+ * If it is on the freelist, move it to the head of the list.
+ */
+ if (vp->v_freeb) {
+ if (vq = vp->v_freef)
+ vq->v_freeb = vp->v_freeb;
+ else
+ vfreet = vp->v_freeb;
+ *vp->v_freeb = vq;
+ vp->v_freef = vfreeh;
+ vp->v_freeb = &vfreeh;
+ vfreeh->v_freeb = &vp->v_freef;
+ vfreeh = vp;
+ }
+ vp->v_type = VBAD;
+}
+
+/*
+ * Lookup a vnode by device number.