X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/70f64c832d2f479426117eb70c158e0c1d5abc6e..99afd20ce5420eed51b50d2ea4806d864724cf2c:/usr/src/sys/kern/vfs_subr.c

diff --git a/usr/src/sys/kern/vfs_subr.c b/usr/src/sys/kern/vfs_subr.c
index 2ea08034dd..cc599a5ed1 100644
--- a/usr/src/sys/kern/vfs_subr.c
+++ b/usr/src/sys/kern/vfs_subr.c
@@ -1,71 +1,94 @@
 /*
- * Copyright (c) 1989 The Regents of the University of California.
- * All rights reserved.
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
  *
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by the University of California, Berkeley.  The name of the
- * University may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * %sccs.include.redist.c%
  *
- *	@(#)vfs_subr.c	7.29 (Berkeley) %G%
+ *	@(#)vfs_subr.c	8.25 (Berkeley) %G%
  */
 
 /*
  * External virtual filesystem routines
  */
 
-#include "param.h"
-#include "mount.h"
-#include "time.h"
-#include "vnode.h"
-#include "namei.h"
-#include "ucred.h"
-#include "errno.h"
-#include "malloc.h"
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/mount.h>
+#include <sys/time.h>
+#include <sys/vnode.h>
+#include <sys/stat.h>
+#include <sys/namei.h>
+#include <sys/ucred.h>
+#include <sys/buf.h>
+#include <sys/errno.h>
+#include <sys/malloc.h>
+#include <sys/domain.h>
+#include <sys/mbuf.h>
+
+#include <vm/vm.h>
+#include <sys/sysctl.h>
+
+#include <miscfs/specfs/specdev.h>
+
+enum vtype iftovt_tab[16] = {
+	VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
+	VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
+};
+int	vttoif_tab[9] = {
+	0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK,
+	S_IFSOCK, S_IFIFO, S_IFMT,
+};
 
 /*
- * Shorthand notation.
+ * Insq/Remq for the vnode usage lists.
  */
-#define v_hashchain v_specinfo->si_hashchain
-#define v_specnext v_specinfo->si_specnext
+#define	bufinsvn(bp, dp)	LIST_INSERT_HEAD(dp, bp, b_vnbufs)
+#define	bufremvn(bp) {							\
+	LIST_REMOVE(bp, b_vnbufs);					\
+	(bp)->b_vnbufs.le_next = NOLIST;				\
+}
+TAILQ_HEAD(freelst, vnode) vnode_free_list;	/* vnode free list */
+struct mntlist mountlist;			/* mounted filesystem list */
+static struct simplelock mntid_slock;
+struct simplelock mntvnode_slock;
+static struct simplelock spechash_slock;
+static struct simplelock vnode_free_list_slock;
 
 /*
- * Remove a mount point from the list of mounted filesystems.
- * Unmount of the root is illegal.
+ * Initialize the vnode management data structures.
  */
 void
-vfs_remove(mp)
-	register struct mount *mp;
+vntblinit()
 {
 
-	if (mp == rootfs)
-		panic("vfs_remove: unmounting root");
-	mp->m_prev->m_next = mp->m_next;
-	mp->m_next->m_prev = mp->m_prev;
-	mp->m_vnodecovered->v_mountedhere = (struct mount *)0;
-	vfs_unlock(mp);
+	simple_lock_init(&mntvnode_slock);
+	simple_lock_init(&mntid_slock);
+	simple_lock_init(&spechash_slock);
+	TAILQ_INIT(&vnode_free_list);
+	simple_lock_init(&vnode_free_list_slock);
+	CIRCLEQ_INIT(&mountlist);
 }
 
 /*
  * Lock a filesystem.
  * Used to prevent access to it while mounting and unmounting.
  */
+int
 vfs_lock(mp)
 	register struct mount *mp;
 {
 
-	while(mp->m_flag & M_MLOCK) {
-		mp->m_flag |= M_MWAIT;
-		sleep((caddr_t)mp, PVFS);
+	while (mp->mnt_flag & MNT_MLOCK) {
+		mp->mnt_flag |= MNT_MWAIT;
+		tsleep((caddr_t)mp, PVFS, "vfslock", 0);
 	}
-	mp->m_flag |= M_MLOCK;
+	mp->mnt_flag |= MNT_MLOCK;
 	return (0);
 }
 
@@ -78,228 +101,481 @@ vfs_unlock(mp)
 	register struct mount *mp;
 {
 
-	if ((mp->m_flag & M_MLOCK) == 0)
-		panic("vfs_unlock: locked fs");
-	mp->m_flag &= ~M_MLOCK;
-	if (mp->m_flag & M_MWAIT) {
-		mp->m_flag &= ~M_MWAIT;
+	if ((mp->mnt_flag & MNT_MLOCK) == 0)
+		panic("vfs_unlock: not locked");
+	mp->mnt_flag &= ~MNT_MLOCK;
+	if (mp->mnt_flag & MNT_MWAIT) {
+		mp->mnt_flag &= ~MNT_MWAIT;
 		wakeup((caddr_t)mp);
 	}
 }
 
 /*
- * Lookup a mount point by filesystem identifier.
+ * Mark a mount point as busy.
+ * Used to synchronize access and to delay unmounting.
  */
-struct mount *
-getvfs(fsid)
-	fsid_t *fsid;
-{
+int
+vfs_busy(mp)
 	register struct mount *mp;
+{
 
-	mp = rootfs;
-	do {
-		if (mp->m_fsid.val[0] == fsid->val[0] &&
-		    mp->m_fsid.val[1] == fsid->val[1]) {
-			return (mp);
-		}
-		mp = mp->m_next;
-	} while (mp != rootfs);
-	return ((struct mount *)0);
+	while (mp->mnt_flag & MNT_MPBUSY) {
+		mp->mnt_flag |= MNT_MPWANT;
+		tsleep((caddr_t)&mp->mnt_flag, PVFS, "vfsbusy", 0);
+	}
+	if (mp->mnt_flag & MNT_UNMOUNT)
+		return (1);
+	mp->mnt_flag |= MNT_MPBUSY;
+	return (0);
 }
 
 /*
- * Set vnode attributes to VNOVAL
+ * Free a busy filesystem.
+ * Panic if filesystem is not busy.
  */
-void vattr_null(vap)
-	register struct vattr *vap;
+void
+vfs_unbusy(mp)
+	register struct mount *mp;
 {
 
-	vap->va_type = VNON;
-	vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid =
-		vap->va_fsid = vap->va_fileid = vap->va_size =
-		vap->va_size1 = vap->va_blocksize = vap->va_rdev =
-		vap->va_bytes = vap->va_bytes1 =
-		vap->va_atime.tv_sec = vap->va_atime.tv_usec =
-		vap->va_mtime.tv_sec = vap->va_mtime.tv_usec =
-		vap->va_ctime.tv_sec = vap->va_ctime.tv_usec =
-		vap->va_flags = vap->va_gen = VNOVAL;
+	if ((mp->mnt_flag & MNT_MPBUSY) == 0)
+		panic("vfs_unbusy: not busy");
+	mp->mnt_flag &= ~MNT_MPBUSY;
+	if (mp->mnt_flag & MNT_MPWANT) {
+		mp->mnt_flag &= ~MNT_MPWANT;
+		wakeup((caddr_t)&mp->mnt_flag);
+	}
 }
 
 /*
- * Initialize a nameidata structure
+ * Lookup a filesystem type, and if found allocate and initialize
+ * a mount structure for it.
+ *
+ * Devname is usually updated by mount(8) after booting.
  */
-ndinit(ndp)
-	register struct nameidata *ndp;
+int
+vfs_rootmountalloc(fstypename, devname, mpp)
+	char *fstypename;
+	char *devname;
+	struct mount **mpp;
 {
+	struct vfsconf *vfsp;
+	struct mount *mp;
 
-	bzero((caddr_t)ndp, sizeof(struct nameidata));
-	ndp->ni_iov = &ndp->ni_nd.nd_iovec;
-	ndp->ni_iovcnt = 1;
-	ndp->ni_base = (caddr_t)&ndp->ni_dent;
-	ndp->ni_rw = UIO_WRITE;
-	ndp->ni_uioseg = UIO_SYSSPACE;
+	for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
+		if (!strcmp(vfsp->vfc_name, fstypename))
+			break;
+	if (vfsp == NULL)
+		return (ENODEV);
+	mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
+	bzero((char *)mp, (u_long)sizeof(struct mount));
+	LIST_INIT(&mp->mnt_vnodelist);
+	mp->mnt_vfc = vfsp;
+	mp->mnt_op = vfsp->vfc_vfsops;
+	mp->mnt_flag = MNT_RDONLY;
+	mp->mnt_vnodecovered = NULLVP;
+	vfsp->vfc_refcount++;
+	mp->mnt_stat.f_type = vfsp->vfc_typenum;
+	mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
+	strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
+	mp->mnt_stat.f_mntonname[0] = '/';
+	(void) copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 0);
+	*mpp = mp;
+	return (0);
 }
 
 /*
- * Duplicate a nameidata structure
+ * Find an appropriate filesystem to use for the root. If a filesystem
+ * has not been preselected, walk through the list of known filesystems
+ * trying those that have mountroot routines, and try them until one
+ * works or we have tried them all.
  */
-nddup(ndp, newndp)
-	register struct nameidata *ndp, *newndp;
+int
+vfs_mountroot()
 {
+	struct vfsconf *vfsp;
+	extern int (*mountroot)(void);
+	int error;
 
-	ndinit(newndp);
-	newndp->ni_cdir = ndp->ni_cdir;
-	VREF(newndp->ni_cdir);
-	newndp->ni_rdir = ndp->ni_rdir;
-	if (newndp->ni_rdir)
-		VREF(newndp->ni_rdir);
-	newndp->ni_cred = ndp->ni_cred;
-	crhold(newndp->ni_cred);
+	if (mountroot != NULL)
+		return ((*vfsp->vfc_mountroot)());
+	for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
+		if (vfsp->vfc_mountroot == NULL)
+			continue;
+		if ((error = (*vfsp->vfc_mountroot)()) == 0)
+			return (0);
+		printf("%s_mountroot failed: %d\n", vfsp->vfc_name, error);
+	}
+	return (ENODEV);
 }
 
 /*
- * Release a nameidata structure
+ * Lookup a mount point by filesystem identifier.
  */
-ndrele(ndp)
-	register struct nameidata *ndp;
+struct mount *
+vfs_getvfs(fsid)
+	fsid_t *fsid;
 {
+	register struct mount *mp;
 
-	vrele(ndp->ni_cdir);
-	if (ndp->ni_rdir)
-		vrele(ndp->ni_rdir);
-	crfree(ndp->ni_cred);
+	for (mp = mountlist.cqh_first; mp != (void *)&mountlist;
+	     mp = mp->mnt_list.cqe_next) {
+		if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] &&
+		    mp->mnt_stat.f_fsid.val[1] == fsid->val[1])
+			return (mp);
+	}
+	return ((struct mount *)0);
 }
 
 /*
- * Routines having to do with the management of the vnode table.
+ * Get a new unique fsid
  */
-struct vnode *vfreeh, **vfreet;
-extern struct vnodeops dead_vnodeops, spec_vnodeops;
-extern void vclean();
+void
+vfs_getnewfsid(mp)
+	struct mount *mp;
+{
+static u_short xxxfs_mntid;
 
-#define	SPECHSZ	64
-#if	((SPECHSZ&(SPECHSZ-1)) == 0)
-#define	SPECHASH(rdev)	(((rdev>>5)+(rdev))&(SPECHSZ-1))
-#else
-#define	SPECHASH(rdev)	(((unsigned)((rdev>>5)+(rdev)))%SPECHSZ)
-#endif
-struct vnode *speclisth[SPECHSZ];
+	fsid_t tfsid;
+	int mtype;
+
+	simple_lock(&mntid_slock);
+	mtype = mp->mnt_vfc->vfc_typenum;
+	mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0);
+	mp->mnt_stat.f_fsid.val[1] = mtype;
+	if (xxxfs_mntid == 0)
+		++xxxfs_mntid;
+	tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid);
+	tfsid.val[1] = mtype;
+	if (mountlist.cqh_first != (void *)&mountlist) {
+		while (vfs_getvfs(&tfsid)) {
+			tfsid.val[0]++;
+			xxxfs_mntid++;
+		}
+	}
+	mp->mnt_stat.f_fsid.val[0] = tfsid.val[0];
+	simple_unlock(&mntid_slock);
+}
 
 /*
- * Initialize the vnode structures and initialize each file system type.
+ * Set vnode attributes to VNOVAL
  */
-vfsinit()
+void
+vattr_null(vap)
+	register struct vattr *vap;
 {
-	register struct vnode *vp = vnode;
-	struct vfsops **vfsp;
 
-	/*
-	 * Build vnode free list.
-	 */
-	vfreeh = vp;
-	vfreet = &vp->v_freef;
-	vp->v_freeb = &vfreeh;
-	vp->v_op = &dead_vnodeops;
-	vp->v_type = VBAD;
-	for (vp++; vp < vnodeNVNODE; vp++) {
-		*vfreet = vp;
-		vp->v_freeb = vfreet;
-		vfreet = &vp->v_freef;
-		vp->v_op = &dead_vnodeops;
-		vp->v_type = VBAD;
-	}
-	vp--;
-	vp->v_freef = NULL;
-	/*
-	 * Initialize the vnode name cache
-	 */
-	nchinit();
-	/*
-	 * Initialize each file system type.
-	 */
-	for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) {
-		if (*vfsp == NULL)
-			continue;
-		(*(*vfsp)->vfs_init)();
-	}
+	vap->va_type = VNON;
+	vap->va_size = vap->va_bytes = VNOVAL;
+	vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid =
+		vap->va_fsid = vap->va_fileid =
+		vap->va_blocksize = vap->va_rdev =
+		vap->va_atime.ts_sec = vap->va_atime.ts_nsec =
+		vap->va_mtime.ts_sec = vap->va_mtime.ts_nsec =
+		vap->va_ctime.ts_sec = vap->va_ctime.ts_nsec =
+		vap->va_flags = vap->va_gen = VNOVAL;
+	vap->va_vaflags = 0;
 }
 
+/*
+ * Routines having to do with the management of the vnode table.
+ */
+extern int (**dead_vnodeop_p)();
+static void vclean __P((struct vnode *vp, int flag, struct proc *p));
+extern void vgonel __P((struct vnode *vp, struct proc *p));
+long numvnodes;
+extern struct vattr va_null;
+int newnodes = 0;
+int printcnt = 0;
+
 /*
  * Return the next vnode from the free list.
  */
+int
 getnewvnode(tag, mp, vops, vpp)
 	enum vtagtype tag;
 	struct mount *mp;
-	struct vnodeops *vops;
+	int (**vops)();
 	struct vnode **vpp;
 {
-	register struct vnode *vp, *vq;
-
-	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;
-	vfreeh = vq;
-	vp->v_freef = NULL;
-	vp->v_freeb = NULL;
-	if (vp->v_type != VBAD)
-		vgone(vp);
+	struct proc *p = curproc;	/* XXX */
+	struct vnode *vp;
+	int s;
+	int cnt;
+
+top:
+	simple_lock(&vnode_free_list_slock);
+newnodes++;
+	if ((vnode_free_list.tqh_first == NULL &&
+	     numvnodes < 2 * desiredvnodes) ||
+	    numvnodes < desiredvnodes) {
+		simple_unlock(&vnode_free_list_slock);
+		vp = (struct vnode *)malloc((u_long)sizeof *vp,
+		    M_VNODE, M_WAITOK);
+		bzero((char *)vp, sizeof *vp);
+		vp->v_freelist.tqe_next = (struct vnode *)0xdeadf;
+		vp->v_freelist.tqe_prev = (struct vnode **)0xdeadb;
+		vp->v_mntvnodes.le_next = (struct vnode *)0xdeadf;
+		vp->v_mntvnodes.le_prev = (struct vnode **)0xdeadb;
+		numvnodes++;
+		vp->v_spare[0] = numvnodes;
+	} else {
+		for (vp = vnode_free_list.tqh_first;
+				vp != NULLVP; vp = vp->v_freelist.tqe_next) {
+			if (simple_lock_try(&vp->v_interlock))
+				break;
+		}
+		/*
+		 * Unless this is a bad time of the month, at most
+		 * the first NCPUS items on the free list are
+		 * locked, so this is close enough to being empty.
+		 */
+		if (vp == NULLVP) {
+			simple_unlock(&vnode_free_list_slock);
+			tablefull("vnode");
+			*vpp = 0;
+			return (ENFILE);
+		}
+		if (vp->v_usecount)
+			panic("free vnode isn't");
+		if (vp->v_freelist.tqe_next == (struct vnode *)0xdeadf ||
+		    vp->v_freelist.tqe_prev == (struct vnode **)0xdeadb)
+			panic("getnewvnode: not on queue");
+		TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
+		vp->v_freelist.tqe_next = (struct vnode *)0xdeadf;
+		/* see comment on why 0xdeadb is set at end of vgone (below) */
+		vp->v_freelist.tqe_prev = (struct vnode **)0xdeadb;
+		simple_unlock(&vnode_free_list_slock);
+		vp->v_lease = NULL;
+		if (vp->v_type != VBAD)
+			vgonel(vp, p);
+		else
+			simple_unlock(&vp->v_interlock);
+#ifdef DIAGNOSTIC
+		if (vp->v_data)
+			panic("cleaned vnode isn't");
+		s = splbio();
+		if (vp->v_numoutput)
+			panic("Clean vnode has pending I/O's");
+		splx(s);
+#endif
+		vp->v_flag = 0;
+		vp->v_lastr = 0;
+		vp->v_ralen = 0;
+		vp->v_maxra = 0;
+		vp->v_lastw = 0;
+		vp->v_lasta = 0;
+		vp->v_cstart = 0;
+		vp->v_clen = 0;
+		vp->v_socket = 0;
+	}
 	vp->v_type = VNON;
-	vp->v_flag = 0;
-	vp->v_shlockc = 0;
-	vp->v_exlockc = 0;
-	vp->v_lastr = 0;
-	vp->v_socket = 0;
 	cache_purge(vp);
 	vp->v_tag = tag;
 	vp->v_op = vops;
 	insmntque(vp, mp);
-	VREF(vp);
 	*vpp = vp;
+	vp->v_usecount = 1;
+	vp->v_data = 0;
+	if (printcnt-- > 0) vprint("getnewvnode got", vp);
 	return (0);
 }
 
 /*
  * Move a vnode from one mount queue to another.
  */
+void
 insmntque(vp, mp)
-	register struct vnode *vp;
-	register struct mount *mp;
+	struct vnode *vp;
+	struct mount *mp;
 {
-	struct vnode *vq;
 
+	simple_lock(&mntvnode_slock);
 	/*
 	 * 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;
+	if (vp->v_mount != NULL) {
+		if (vp->v_mntvnodes.le_next == (struct vnode *)0xdeadf ||
+		    vp->v_mntvnodes.le_prev == (struct vnode **)0xdeadb)
+			panic("insmntque: not on queue");
+		LIST_REMOVE(vp, v_mntvnodes);
+		vp->v_mntvnodes.le_next = (struct vnode *)0xdeadf;
+		vp->v_mntvnodes.le_prev = (struct vnode **)0xdeadb;
 	}
 	/*
 	 * 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 ((vp->v_mount = mp) != NULL)
+		LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes);
+	simple_unlock(&mntvnode_slock);
+}
+
+/*
+ * Update outstanding I/O count and do wakeup if requested.
+ */
+void
+vwakeup(bp)
+	register struct buf *bp;
+{
+	register struct vnode *vp;
+
+	bp->b_flags &= ~B_WRITEINPROG;
+	if (vp = bp->b_vp) {
+		if (--vp->v_numoutput < 0)
+			panic("vwakeup: neg numoutput");
+		if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) {
+			if (vp->v_numoutput < 0)
+				panic("vwakeup: neg numoutput 2");
+			vp->v_flag &= ~VBWAIT;
+			wakeup((caddr_t)&vp->v_numoutput);
+		}
 	}
-	if (mp->m_mounth) {
-		vp->v_mountf = mp->m_mounth;
-		vp->v_mountb = &mp->m_mounth;
-		mp->m_mounth->v_mountb = &vp->v_mountf;
-		mp->m_mounth = vp;
-	} else {
-		mp->m_mounth = vp;
-		vp->v_mountb = &mp->m_mounth;
-		vp->v_mountf = NULL;
+}
+
+/*
+ * Flush out and invalidate all buffers associated with a vnode.
+ * Called with the underlying object locked.
+ */
+int
+vinvalbuf(vp, flags, cred, p, slpflag, slptimeo)
+	register struct vnode *vp;
+	int flags;
+	struct ucred *cred;
+	struct proc *p;
+	int slpflag, slptimeo;
+{
+	register struct buf *bp;
+	struct buf *nbp, *blist;
+	int s, error;
+
+	if (flags & V_SAVE) {
+		if (error = VOP_FSYNC(vp, cred, MNT_WAIT, p))
+			return (error);
+		if (vp->v_dirtyblkhd.lh_first != NULL)
+			panic("vinvalbuf: dirty bufs");
 	}
+	for (;;) {
+		if ((blist = vp->v_cleanblkhd.lh_first) && flags & V_SAVEMETA)
+			while (blist && blist->b_lblkno < 0)
+				blist = blist->b_vnbufs.le_next;
+		if (!blist && (blist = vp->v_dirtyblkhd.lh_first) &&
+		    (flags & V_SAVEMETA))
+			while (blist && blist->b_lblkno < 0)
+				blist = blist->b_vnbufs.le_next;
+		if (!blist)
+			break;
+
+		for (bp = blist; bp; bp = nbp) {
+			nbp = bp->b_vnbufs.le_next;
+			if (flags & V_SAVEMETA && bp->b_lblkno < 0)
+				continue;
+			s = splbio();
+			if (bp->b_flags & B_BUSY) {
+				bp->b_flags |= B_WANTED;
+				error = tsleep((caddr_t)bp,
+					slpflag | (PRIBIO + 1), "vinvalbuf",
+					slptimeo);
+				splx(s);
+				if (error)
+					return (error);
+				break;
+			}
+			bremfree(bp);
+			bp->b_flags |= B_BUSY;
+			splx(s);
+			/*
+			 * XXX Since there are no node locks for NFS, I believe
+			 * there is a slight chance that a delayed write will
+			 * occur while sleeping just above, so check for it.
+			 */
+			if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) {
+				(void) VOP_BWRITE(bp);
+				break;
+			}
+			bp->b_flags |= B_INVAL;
+			brelse(bp);
+		}
+	}
+	if (!(flags & V_SAVEMETA) &&
+	    (vp->v_dirtyblkhd.lh_first || vp->v_cleanblkhd.lh_first))
+		panic("vinvalbuf: flush failed");
+	return (0);
+}
+
+/*
+ * Associate a buffer with a vnode.
+ */
+void
+bgetvp(vp, bp)
+	register struct vnode *vp;
+	register struct buf *bp;
+{
+
+	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.
+	 */
+	bufinsvn(bp, &vp->v_cleanblkhd);
+}
+
+/*
+ * Disassociate a buffer from a vnode.
+ */
+void
+brelvp(bp)
+	register struct buf *bp;
+{
+	struct vnode *vp;
+
+	if (bp->b_vp == (struct vnode *) 0)
+		panic("brelvp: NULL");
+	/*
+	 * Delete from old vnode list, if on one.
+	 */
+	if (bp->b_vnbufs.le_next != NOLIST)
+		bufremvn(bp);
+	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.
+ */
+void
+reassignbuf(bp, newvp)
+	register struct buf *bp;
+	register struct vnode *newvp;
+{
+	register struct buflists *listheadp;
+
+	if (newvp == NULL) {
+		printf("reassignbuf: NULL");
+		return;
+	}
+	/*
+	 * Delete from old vnode list, if on one.
+	 */
+	if (bp->b_vnbufs.le_next != NOLIST)
+		bufremvn(bp);
+	/*
+	 * 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;
+	bufinsvn(bp, listheadp);
 }
 
 /*
@@ -307,6 +583,7 @@ insmntque(vp, mp)
  * Used for root filesystem, argdev, and swap areas.
  * Also used for memory file system special devices.
  */
+int
 bdevvp(dev, vpp)
 	dev_t dev;
 	struct vnode **vpp;
@@ -315,9 +592,13 @@ bdevvp(dev, vpp)
 	struct vnode *nvp;
 	int error;
 
-	error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp);
+	if (dev == NODEV) {
+		*vpp = NULLVP;
+		return (ENODEV);
+	}
+	error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp);
 	if (error) {
-		*vpp = 0;
+		*vpp = NULLVP;
 		return (error);
 	}
 	vp = nvp;
@@ -344,44 +625,54 @@ checkalias(nvp, nvp_rdev, mp)
 	dev_t nvp_rdev;
 	struct mount *mp;
 {
-	register struct vnode *vp;
+	struct proc *p = curproc;	/* XXX */
+	struct vnode *vp;
 	struct vnode **vpp;
 
 	if (nvp->v_type != VBLK && nvp->v_type != VCHR)
-		return ((struct vnode *)0);
+		return (NULLVP);
 
 	vpp = &speclisth[SPECHASH(nvp_rdev)];
 loop:
+	simple_lock(&spechash_slock);
 	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.
 		 */
+		simple_lock(&vp->v_interlock);
 		if (vp->v_usecount == 0) {
-			vgone(vp);
+			simple_unlock(&spechash_slock);
+			vgonel(vp, p);
 			goto loop;
 		}
-		if (vget(vp))
+		if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) {
+			simple_unlock(&spechash_slock);
 			goto loop;
+		}
 		break;
 	}
 	if (vp == NULL || vp->v_tag != VT_NON) {
-		if (vp != NULL) {
-			nvp->v_flag |= VALIASED;
-			vp->v_flag |= VALIASED;
-			vput(vp);
-		}
 		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;
+		simple_unlock(&spechash_slock);
 		*vpp = nvp;
-		return ((struct vnode *)0);
+		if (vp != NULLVP) {
+			nvp->v_flag |= VALIASED;
+			vp->v_flag |= VALIASED;
+			vput(vp);
+		}
+		return (NULLVP);
 	}
-	VOP_UNLOCK(vp);
-	vclean(vp, 0);
+	simple_unlock(&spechash_slock);
+	VOP_UNLOCK(vp, 0, p);
+	simple_lock(&vp->v_interlock);
+	vclean(vp, 0, p);
 	vp->v_op = nvp->v_op;
 	vp->v_tag = nvp->v_tag;
 	nvp->v_type = VNON;
@@ -397,104 +688,231 @@ loop:
  * indicate that the vnode is no longer usable (possibly having
  * been changed to a new file system type).
  */
-vget(vp)
-	register struct vnode *vp;
+int
+vget(vp, flags, p)
+	struct vnode *vp;
+	int flags;
+	struct proc *p;
 {
-	register struct vnode *vq;
 
+	/*
+	 * If the vnode is in the process of being cleaned out for
+	 * another use, we wait for the cleaning to finish and then
+	 * return failure. Cleaning is determined by checking that
+	 * the VXLOCK flag is set.
+	 */
+	if ((flags & LK_INTERLOCK) == 0)
+		simple_lock(&vp->v_interlock);
 	if (vp->v_flag & VXLOCK) {
 		vp->v_flag |= VXWANT;
-		sleep((caddr_t)vp, PINOD);
-		return (1);
+		simple_unlock(&vp->v_interlock);
+		tsleep((caddr_t)vp, PINOD, "vget", 0);
+		return (ENOENT);
 	}
 	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;
+		if (vp->v_freelist.tqe_next == (struct vnode *)0xdeadf ||
+		    vp->v_freelist.tqe_prev == (struct vnode **)0xdeadb)
+			panic("vget: not on queue");
+		TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
+		simple_unlock(&vnode_free_list_slock);
+	}
+		vp->v_freelist.tqe_next = (struct vnode *)0xdeadf;
+		vp->v_freelist.tqe_prev = (struct vnode **)0xdeadb;
 	}
-	VREF(vp);
-	VOP_LOCK(vp);
+	vp->v_usecount++;
+	if (flags & LK_TYPE_MASK)
+		return (vn_lock(vp, flags | LK_INTERLOCK, p));
+	simple_unlock(&vp->v_interlock);
+	if (printcnt-- > 0) vprint("vget got", vp);
+	return (0);
+}
+
+int bug_refs = 0;
+
+/*
+ * Stubs to use when there is no locking to be done on the underlying object.
+ *
+ * Getting a lock just clears the interlock if necessary.
+ */
+int
+vop_nolock(ap)
+	struct vop_lock_args /* {
+		struct vnode *a_vp;
+		int a_flags;
+		struct proc *a_p;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+
+	/*
+	 * Since we are not using the lock manager, we must clear
+	 * the interlock here.
+	 */
+	if (ap->a_flags & LK_INTERLOCK)
+		simple_unlock(&vp->v_interlock);
+	return (0);
+}
+
+/*
+ * Unlock has nothing to do.
+ */
+int
+vop_nounlock(ap)
+	struct vop_unlock_args /* {
+		struct vnode *a_vp;
+		int a_flags;
+		struct proc *a_p;
+	} */ *ap;
+{
+
+	return (0);
+}
+
+/*
+ * Nothing is ever locked.
+ */
+int
+vop_noislocked(ap)
+	struct vop_islocked_args /* {
+		struct vnode *a_vp;
+	} */ *ap;
+{
+
 	return (0);
 }
 
 /*
- * Vnode reference, just increment the count
+ * Vnode reference.
  */
-void vref(vp)
+void
+vref(vp)
 	struct vnode *vp;
 {
 
+	simple_lock(&vp->v_interlock);
+	if (vp->v_usecount <= 0)
+		panic("vref used where vget required");
+	if (vp->v_freelist.tqe_next != (struct vnode *)0xdeadf ||
+	    vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb)
+		panic("vref: not free");
 	vp->v_usecount++;
+	simple_unlock(&vp->v_interlock);
+	if (printcnt-- > 0) vprint("vref get", vp);
+	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;
+void
+vput(vp)
+	struct vnode *vp;
 {
-	VOP_UNLOCK(vp);
-	vrele(vp);
+	struct proc *p = curproc;	/* XXX */
+
+#ifdef DIGANOSTIC
+	if (vp == NULL)
+		panic("vput: null vp");
+#endif
+	simple_lock(&vp->v_interlock);
+	vp->v_usecount--;
+	if (vp->v_usecount > 0) {
+		simple_unlock(&vp->v_interlock);
+		VOP_UNLOCK(vp, 0, p);
+		return;
+	}
+#ifdef DIAGNOSTIC
+	if (vp->v_usecount < 0 || vp->v_writecount != 0) {
+		vprint("vput: bad ref count", vp);
+		panic("vput: ref cnt");
+	}
+#endif
+	/*
+	 * insert at tail of LRU list
+	 */
+	simple_lock(&vnode_free_list_slock);
+	TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
+	simple_unlock(&vnode_free_list_slock);
+	simple_unlock(&vp->v_interlock);
+	VOP_INACTIVE(vp, p);
 }
 
 /*
  * Vnode release.
  * If count drops to zero, call inactive routine and return to freelist.
  */
-void vrele(vp)
-	register struct vnode *vp;
+void
+vrele(vp)
+	struct vnode *vp;
 {
+	struct proc *p = curproc;	/* XXX */
 
+#ifdef DIAGNOSTIC
 	if (vp == NULL)
 		panic("vrele: null vp");
+#endif
+	simple_lock(&vp->v_interlock);
 	vp->v_usecount--;
-	if (vp->v_usecount < 0)
-		vprint("vrele: bad ref count", vp);
-	if (vp->v_usecount > 0)
+	if (printcnt-- > 0) vprint("vrele put", vp);
+	if (vp->v_type != VBLK && curproc)
+		curproc->p_spare[0]--;
+	if (bug_refs)
+		vprint("vref: ");
+	if (vp->v_usecount > 0) {
+		simple_unlock(&vp->v_interlock);
 		return;
-	if (vfreeh == (struct vnode *)0) {
-		/*
-		 * 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);
+#ifdef DIAGNOSTIC
+	if (vp->v_usecount < 0 || vp->v_writecount != 0) {
+		vprint("vrele: bad ref count", vp);
+		panic("vrele: ref cnt");
+	}
+#endif
+	/*
+	 * insert at tail of LRU list
+	 */
+	simple_lock(&vnode_free_list_slock);
+	if (vp->v_freelist.tqe_next != (struct vnode *)0xdeadf ||
+	    vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb)
+		panic("vrele: not free");
+	TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
+	simple_unlock(&vnode_free_list_slock);
+	if (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, p) == 0)
+		VOP_INACTIVE(vp, p);
 }
 
+#ifdef DIAGNOSTIC
 /*
  * Page or buffer structure gets a reference.
  */
+void
 vhold(vp)
 	register struct vnode *vp;
 {
 
+	simple_lock(&vp->v_interlock);
 	vp->v_holdcnt++;
+	simple_unlock(&vp->v_interlock);
 }
 
 /*
  * Page or buffer structure frees a reference.
  */
+void
 holdrele(vp)
 	register struct vnode *vp;
 {
 
+	simple_lock(&vp->v_interlock);
 	if (vp->v_holdcnt <= 0)
 		panic("holdrele: holdcnt");
 	vp->v_holdcnt--;
+	simple_unlock(&vp->v_interlock);
 }
+#endif /* DIAGNOSTIC */
 
 /*
  * Remove any vnodes in the vnode table belonging to mount point mp.
@@ -504,50 +922,90 @@ holdrele(vp)
  * system error). If MNT_FORCE is specified, detach any active vnodes
  * that are found.
  */
-int busyprt = 0;	/* patch to print out busy vnodes */
+#ifdef DIAGNOSTIC
+int busyprt = 0;	/* print out busy vnodes */
+struct ctldebug debug1 = { "busyprt", &busyprt };
+#endif
 
+int
 vflush(mp, skipvp, flags)
 	struct mount *mp;
 	struct vnode *skipvp;
 	int flags;
 {
-	register struct vnode *vp, *nvp;
+	struct proc *p = curproc;	/* XXX */
+	struct vnode *vp, *nvp;
 	int busy = 0;
 
-	for (vp = mp->m_mounth; vp; vp = nvp) {
-		nvp = vp->v_mountf;
+#ifdef DIAGNOSTIC
+	if ((mp->mnt_flag & MNT_MPBUSY) == 0)
+		panic("vflush: not busy");
+#endif
+
+	simple_lock(&mntvnode_slock);
+loop:
+	for (vp = mp->mnt_vnodelist.lh_first; vp; vp = nvp) {
+		if (vp->v_mount != mp)
+			goto loop;
+		nvp = vp->v_mntvnodes.le_next;
 		/*
 		 * Skip over a selected vnode.
-		 * Used by ufs to skip over the quota structure inode.
 		 */
 		if (vp == skipvp)
 			continue;
+
+		simple_lock(&vp->v_interlock);
+		/*
+		 * Skip over a vnodes marked VSYSTEM.
+		 */
+		if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) {
+			simple_unlock(&vp->v_interlock);
+			continue;
+		}
+		/*
+		 * If WRITECLOSE is set, only flush out regular file
+		 * vnodes open for writing.
+		 */
+		if ((flags & WRITECLOSE) &&
+		    (vp->v_writecount == 0 || vp->v_type != VREG)) {
+			simple_unlock(&vp->v_interlock);
+			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);
+			simple_unlock(&mntvnode_slock);
+			vgonel(vp, p);
+			simple_lock(&mntvnode_slock);
 			continue;
 		}
 		/*
+		 * If FORCECLOSE is set, forcibly close the vnode.
 		 * For block or character devices, revert to an
 		 * anonymous device. For all other files, just kill them.
 		 */
-		if (flags & MNT_FORCE) {
+		if (flags & FORCECLOSE) {
+			simple_unlock(&mntvnode_slock);
 			if (vp->v_type != VBLK && vp->v_type != VCHR) {
-				vgone(vp);
+				vgonel(vp, p);
 			} else {
-				vclean(vp, 0);
-				vp->v_op = &spec_vnodeops;
+				vclean(vp, 0, p);
+				vp->v_op = spec_vnodeop_p;
 				insmntque(vp, (struct mount *)0);
 			}
+			simple_lock(&mntvnode_slock);
 			continue;
 		}
+#ifdef DIAGNOSTIC
 		if (busyprt)
 			vprint("vflush: busy vnode", vp);
+#endif
+		simple_unlock(&vp->v_interlock);
 		busy++;
 	}
+	simple_unlock(&mntvnode_slock);
 	if (busy)
 		return (EBUSY);
 	return (0);
@@ -555,12 +1013,14 @@ vflush(mp, skipvp, flags)
 
 /*
  * Disassociate the underlying file system from a vnode.
+ * The vnode interlock is held on entry.
  */
-void vclean(vp, doclose)
-	register struct vnode *vp;
-	long doclose;
+static void
+vclean(vp, flags, p)
+	struct vnode *vp;
+	int flags;
+	struct proc *p;
 {
-	struct vnodeops *origops;
 	int active;
 
 	/*
@@ -570,7 +1030,7 @@ void vclean(vp, doclose)
 	 * race against ourselves to recycle it.
 	 */
 	if (active = vp->v_usecount)
-		VREF(vp);
+		vp->v_usecount++;
 	/*
 	 * Prevent the vnode from being recycled or
 	 * brought into use while we clean it out.
@@ -583,38 +1043,44 @@ void vclean(vp, doclose)
 	 * 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.
+	 * occur while the underlying object is being cleaned out.
 	 */
-	VOP_LOCK(vp);
-	if (doclose)
-		vinvalbuf(vp, 1);
+	VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK, p);
 	/*
-	 * Prevent any further operations on the vnode from
-	 * being passed through to the old file system.
+	 * Clean out any buffers associated with the vnode.
 	 */
-	origops = vp->v_op;
-	vp->v_op = &dead_vnodeops;
-	vp->v_tag = VT_NON;
+	if (flags & DOCLOSE)
+		vinvalbuf(vp, V_SAVE, NOCRED, NULL, 0, 0);
 	/*
-	 * If purging an active vnode, it must be unlocked, closed,
-	 * and deactivated before being reclaimed.
+	 * If purging an active vnode, it must be closed and
+	 * deactivated before being reclaimed. Note that the
+	 * VOP_INACTIVE will unlock the vnode.
 	 */
-	(*(origops->vn_unlock))(vp);
 	if (active) {
-		if (doclose)
-			(*(origops->vn_close))(vp, 0, NOCRED);
-		(*(origops->vn_inactive))(vp);
+		if (flags & DOCLOSE)
+			VOP_CLOSE(vp, IO_NDELAY, NOCRED, p);
+		VOP_INACTIVE(vp, p);
+	} else {
+		/*
+		 * Any other processes trying to obtain this lock must first
+		 * wait for VXLOCK to clear, then call the new lock operation.
+		 */
+		VOP_UNLOCK(vp, 0, p);
 	}
 	/*
 	 * Reclaim the vnode.
 	 */
-	if ((*(origops->vn_reclaim))(vp))
+	if (VOP_RECLAIM(vp, p))
 		panic("vclean: cannot reclaim");
 	if (active)
 		vrele(vp);
+	cache_purge(vp);
+
 	/*
-	 * Done with purge, notify sleepers in vget of the grim news.
+	 * Done with purge, notify sleepers of the grim news.
 	 */
+	vp->v_op = dead_vnodeop_p;
+	vp->v_tag = VT_NON;
 	vp->v_flag &= ~VXLOCK;
 	if (vp->v_flag & VXWANT) {
 		vp->v_flag &= ~VXWANT;
@@ -626,52 +1092,138 @@ void vclean(vp, doclose)
  * Eliminate all activity associated with  the requested vnode
  * and with all vnodes aliased to the requested vnode.
  */
-void vgoneall(vp)
-	register struct vnode *vp;
+int
+vop_revoke(ap)
+	struct vop_revoke_args /* {
+		struct vnode *a_vp;
+		int a_flags;
+	} */ *ap;
 {
-	register struct vnode *vq;
+	struct vnode *vp, *vq;
+	struct proc *p = curproc;	/* XXX */
 
-	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;
+#ifdef DIAGNOSTIC
+	if ((ap->a_flags & REVOKEALL) == 0)
+		panic("vop_revoke");
+#endif
+
+	vp = ap->a_vp;
+	simple_lock(&vp->v_interlock);
+
+	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;
+			simple_unlock(&vp->v_interlock);
+			tsleep((caddr_t)vp, PINOD, "vop_revokeall", 0);
+			return (0);
 		}
+		/*
+		 * Ensure that vp will not be vgone'd while we
+		 * are eliminating its aliases.
+		 */
+		vp->v_flag |= VXLOCK;
+		simple_unlock(&vp->v_interlock);
+		while (vp->v_flag & VALIASED) {
+			simple_lock(&spechash_slock);
+			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;
+				simple_unlock(&spechash_slock);
+				vgone(vq);
+				break;
+			}
+			if (vq == NULLVP)
+				simple_unlock(&spechash_slock);
+		}
+		/*
+		 * Remove the lock so that vgone below will
+		 * really eliminate the vnode after which time
+		 * vgone will awaken any sleepers.
+		 */
+		simple_lock(&vp->v_interlock);
+		vp->v_flag &= ~VXLOCK;
 	}
-	vgone(vp);
+	vgonel(vp, p);
+	return (0);
+}
+
+/*
+ * Recycle an unused vnode to the front of the free list.
+ * Release the passed interlock if the vnode will be recycled.
+ */
+int
+vrecycle(vp, inter_lkp, p)
+	struct vnode *vp;
+	struct simplelock *inter_lkp;
+	struct proc *p;
+{
+
+	simple_lock(&vp->v_interlock);
+	if (vp->v_usecount == 0) {
+		if (inter_lkp)
+			simple_unlock(inter_lkp);
+		vgonel(vp, p);
+		return (1);
+	}
+	simple_unlock(&vp->v_interlock);
+	return (0);
 }
 
 /*
  * Eliminate all activity associated with a vnode
  * in preparation for reuse.
  */
-void vgone(vp)
-	register struct vnode *vp;
+void
+vgone(vp)
+	struct vnode *vp;
 {
-	register struct vnode *vq;
+	struct proc *p = curproc;	/* XXX */
+
+	simple_lock(&vp->v_interlock);
+	vgonel(vp, p);
+}
+
+/*
+ * vgone, with the vp interlock held.
+ */
+void
+vgonel(vp, p)
+	struct vnode *vp;
+	struct proc *p;
+{
+	struct vnode *vq;
 	struct vnode *vx;
-	long count;
 
+	/*
+	 * 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;
+		simple_unlock(&vp->v_interlock);
+		tsleep((caddr_t)vp, PINOD, "vgone", 0);
+		return;
+	}
 	/*
 	 * Clean out the filesystem specific data.
 	 */
-	vclean(vp, 1);
+	vclean(vp, DOCLOSE, p);
 	/*
 	 * 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;
-	}
+	if (vp->v_mount != NULL)
+		insmntque(vp, (struct mount *)0);
 	/*
-	 * If special device, remove it from special device alias list.
+	 * If special device, remove it from special device alias list
+	 * if it is on one.
 	 */
-	if (vp->v_type == VBLK || vp->v_type == VCHR) {
+	if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != 0) {
+		simple_lock(&spechash_slock);
 		if (*vp->v_hashchain == vp) {
 			*vp->v_hashchain = vp->v_specnext;
 		} else {
@@ -685,36 +1237,46 @@ void vgone(vp)
 				panic("missing bdev");
 		}
 		if (vp->v_flag & VALIASED) {
-			count = 0;
+			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;
-				count++;
+				if (vx)
+					break;
 				vx = vq;
 			}
-			if (count == 0)
+			if (vx == NULL)
 				panic("missing alias");
-			if (count == 1)
+			if (vq == NULL)
 				vx->v_flag &= ~VALIASED;
 			vp->v_flag &= ~VALIASED;
 		}
+		simple_unlock(&spechash_slock);
 		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 it is on the freelist and not already at the head,
+	 * move it to the head of the list. The test of the back
+	 * pointer and the reference count of zero is because
+	 * it will be removed from the free list by getnewvnode,
+	 * but will not have its reference count incremented until
+	 * after calling vgone. If the reference count were
+	 * incremented first, vgone would (incorrectly) try to
+	 * close the previous instance of the underlying object.
+	 * So, the back pointer is explicitly set to `0xdeadb' in
+	 * getnewvnode after removing it from the freelist to ensure
+	 * that we do not try to move it here.
 	 */
-	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;
+	if (vp->v_usecount == 0) {
+		simple_lock(&vnode_free_list_slock);
+		if ((vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb) &&
+		    vnode_free_list.tqh_first != vp) {
+			TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
+			TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
+		}
+		simple_unlock(&vnode_free_list_slock);
 	}
 	vp->v_type = VBAD;
 }
@@ -722,46 +1284,56 @@ void vgone(vp)
 /*
  * Lookup a vnode by device number.
  */
+int
 vfinddev(dev, type, vpp)
 	dev_t dev;
 	enum vtype type;
 	struct vnode **vpp;
 {
-	register struct vnode *vp;
+	struct vnode *vp;
+	int rc = 0;
 
+	simple_lock(&spechash_slock);
 	for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) {
 		if (dev != vp->v_rdev || type != vp->v_type)
 			continue;
 		*vpp = vp;
-		return (0);
+		rc = 1;
+		break;
 	}
-	return (1);
+	simple_unlock(&spechash_slock);
+	return (rc);
 }
 
 /*
  * Calculate the total number of references to a special device.
  */
+int
 vcount(vp)
-	register struct vnode *vp;
+	struct vnode *vp;
 {
-	register struct vnode *vq;
+	struct vnode *vq, *vnext;
 	int count;
 
+loop:
 	if ((vp->v_flag & VALIASED) == 0)
 		return (vp->v_usecount);
-loop:
-	for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
+	simple_lock(&spechash_slock);
+	for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) {
+		vnext = vq->v_specnext;
 		if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type)
 			continue;
 		/*
 		 * Alias, but not in use, so flush it out.
 		 */
-		if (vq->v_usecount == 0) {
+		if (vq->v_usecount == 0 && vq != vp) {
+			simple_unlock(&spechash_slock);
 			vgone(vq);
 			goto loop;
 		}
 		count += vq->v_usecount;
 	}
+	simple_unlock(&spechash_slock);
 	return (count);
 }
 
@@ -769,8 +1341,9 @@ loop:
  * Print out a description of a vnode.
  */
 static char *typename[] =
-	{ "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VBAD" };
+   { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" };
 
+void
 vprint(label, vp)
 	char *label;
 	register struct vnode *vp;
@@ -779,29 +1352,388 @@ vprint(label, vp)
 
 	if (label != NULL)
 		printf("%s: ", label);
-	printf("type %s, usecount %d, refcount %d,", typename[vp->v_type],
-		vp->v_usecount, vp->v_holdcnt);
+	printf("num %d ", vp->v_spare[0]);
+	printf("type %s, usecount %d, writecount %d, refcount %d,",
+		typename[vp->v_type], vp->v_usecount, vp->v_writecount,
+		vp->v_holdcnt);
 	buf[0] = '\0';
 	if (vp->v_flag & VROOT)
 		strcat(buf, "|VROOT");
 	if (vp->v_flag & VTEXT)
 		strcat(buf, "|VTEXT");
+	if (vp->v_flag & VSYSTEM)
+		strcat(buf, "|VSYSTEM");
 	if (vp->v_flag & VXLOCK)
 		strcat(buf, "|VXLOCK");
 	if (vp->v_flag & VXWANT)
 		strcat(buf, "|VXWANT");
-	if (vp->v_flag & VEXLOCK)
-		strcat(buf, "|VEXLOCK");
-	if (vp->v_flag & VSHLOCK)
-		strcat(buf, "|VSHLOCK");
-	if (vp->v_flag & VLWAIT)
-		strcat(buf, "|VLWAIT");
-	if (vp->v_flag & VALIASED)
-		strcat(buf, "|VALIASED");
 	if (vp->v_flag & VBWAIT)
 		strcat(buf, "|VBWAIT");
+	if (vp->v_flag & VALIASED)
+		strcat(buf, "|VALIASED");
 	if (buf[0] != '\0')
 		printf(" flags (%s)", &buf[1]);
-	printf("\n\t");
-	VOP_PRINT(vp);
+	if (vp->v_data == NULL) {
+		printf("\n");
+	} else {
+		printf("\n\t");
+		VOP_PRINT(vp);
+	}
+}
+
+#ifdef DEBUG
+/*
+ * List all of the locked vnodes in the system.
+ * Called when debugging the kernel.
+ */
+void
+printlockedvnodes()
+{
+	register struct mount *mp;
+	register struct vnode *vp;
+
+	printf("Locked vnodes\n");
+	for (mp = mountlist.cqh_first; mp != (void *)&mountlist;
+	     mp = mp->mnt_list.cqe_next) {
+		for (vp = mp->mnt_vnodelist.lh_first;
+		     vp != NULL;
+		     vp = vp->v_mntvnodes.le_next) {
+			if (VOP_ISLOCKED(vp))
+				vprint((char *)0, vp);
+		}
+	}
+}
+#endif
+
+/*
+ * Top level filesystem related information gathering.
+ */
+int
+vfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
+	int *name;
+	u_int namelen;
+	void *oldp;
+	size_t *oldlenp;
+	void *newp;
+	size_t newlen;
+	struct proc *p;
+{
+	struct ctldebug *cdp;
+	struct vfsconf *vfsp;
+
+	/* all sysctl names at this level are at least name and field */
+	if (namelen < 2)
+		return (ENOTDIR);		/* overloaded */
+	if (name[0] != VFS_GENERIC) {
+		for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
+			if (vfsp->vfc_typenum == name[0])
+				break;
+		if (vfsp == NULL)
+			return (EOPNOTSUPP);
+		return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1,
+		    oldp, oldlenp, newp, newlen, p));
+	}
+	switch (name[1]) {
+	case VFS_MAXTYPENUM:
+		return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf));
+	case VFS_CONF:
+		if (namelen < 3)
+			return (ENOTDIR);	/* overloaded */
+		for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
+			if (vfsp->vfc_typenum == name[2])
+				break;
+		if (vfsp == NULL)
+			return (EOPNOTSUPP);
+		return (sysctl_rdstruct(oldp, oldlenp, newp, vfsp,
+		    sizeof(struct vfsconf)));
+	}
+	return (EOPNOTSUPP);
+}
+
+int kinfo_vdebug = 1;
+int kinfo_vgetfailed;
+#define KINFO_VNODESLOP	10
+/*
+ * Dump vnode list (via sysctl).
+ * Copyout address of vnode followed by vnode.
+ */
+/* ARGSUSED */
+int
+sysctl_vnode(where, sizep)
+	char *where;
+	size_t *sizep;
+{
+	register struct mount *mp, *nmp;
+	struct vnode *nvp, *vp;
+	register char *bp = where, *savebp;
+	char *ewhere;
+	int error;
+
+#define VPTRSZ	sizeof (struct vnode *)
+#define VNODESZ	sizeof (struct vnode)
+	if (where == NULL) {
+		*sizep = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ);
+		return (0);
+	}
+	ewhere = where + *sizep;
+		
+	for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
+		nmp = mp->mnt_list.cqe_next;
+		if (vfs_busy(mp))
+			continue;
+		savebp = bp;
+again:
+		simple_lock(&mntvnode_slock);
+		for (vp = mp->mnt_vnodelist.lh_first;
+		     vp != NULL;
+		     vp = nvp) {
+			/*
+			 * Check that the vp is still associated with
+			 * this filesystem.  RACE: could have been
+			 * recycled onto the same filesystem.
+			 */
+			if (vp->v_mount != mp) {
+				simple_unlock(&mntvnode_slock);
+				if (kinfo_vdebug)
+					printf("kinfo: vp changed\n");
+				bp = savebp;
+				goto again;
+			}
+			nvp = vp->v_mntvnodes.le_next;
+			if (bp + VPTRSZ + VNODESZ > ewhere) {
+				simple_unlock(&mntvnode_slock);
+				*sizep = bp - where;
+				return (ENOMEM);
+			}
+			simple_unlock(&mntvnode_slock);
+			if ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) ||
+			   (error = copyout((caddr_t)vp, bp + VPTRSZ, VNODESZ)))
+				return (error);
+			bp += VPTRSZ + VNODESZ;
+			simple_lock(&mntvnode_slock);
+		}
+		simple_unlock(&mntvnode_slock);
+		vfs_unbusy(mp);
+	}
+
+	*sizep = bp - where;
+	return (0);
+}
+
+/*
+ * Check to see if a filesystem is mounted on a block device.
+ */
+int
+vfs_mountedon(vp)
+	struct vnode *vp;
+{
+	struct vnode *vq;
+	int error = 0;
+
+	if (vp->v_specflags & SI_MOUNTEDON)
+		return (EBUSY);
+	if (vp->v_flag & VALIASED) {
+		simple_lock(&spechash_slock);
+		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 (vq->v_specflags & SI_MOUNTEDON) {
+				error = EBUSY;
+				break;
+			}
+		}
+		simple_unlock(&spechash_slock);
+	}
+	return (error);
+}
+
+/*
+ * Unmount all filesystems. The list is traversed in reverse order
+ * of mounting to avoid dependencies.
+ */
+void
+vfs_unmountall()
+{
+	struct mount *mp, *nmp;
+
+	for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) {
+		nmp = mp->mnt_list.cqe_prev;
+		(void) dounmount(mp, MNT_FORCE, &proc0);
+	}
+}
+
+/*
+ * Build hash lists of net addresses and hang them off the mount point.
+ * Called by ufs_mount() to set up the lists of export addresses.
+ */
+static int
+vfs_hang_addrlist(mp, nep, argp)
+	struct mount *mp;
+	struct netexport *nep;
+	struct export_args *argp;
+{
+	register struct netcred *np;
+	register struct radix_node_head *rnh;
+	register int i;
+	struct radix_node *rn;
+	struct sockaddr *saddr, *smask = 0;
+	struct domain *dom;
+	int error;
+
+	if (argp->ex_addrlen == 0) {
+		if (mp->mnt_flag & MNT_DEFEXPORTED)
+			return (EPERM);
+		np = &nep->ne_defexported;
+		np->netc_exflags = argp->ex_flags;
+		np->netc_anon = argp->ex_anon;
+		np->netc_anon.cr_ref = 1;
+		mp->mnt_flag |= MNT_DEFEXPORTED;
+		return (0);
+	}
+	i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
+	np = (struct netcred *)malloc(i, M_NETADDR, M_WAITOK);
+	bzero((caddr_t)np, i);
+	saddr = (struct sockaddr *)(np + 1);
+	if (error = copyin(argp->ex_addr, (caddr_t)saddr, argp->ex_addrlen))
+		goto out;
+	if (saddr->sa_len > argp->ex_addrlen)
+		saddr->sa_len = argp->ex_addrlen;
+	if (argp->ex_masklen) {
+		smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
+		error = copyin(argp->ex_addr, (caddr_t)smask, argp->ex_masklen);
+		if (error)
+			goto out;
+		if (smask->sa_len > argp->ex_masklen)
+			smask->sa_len = argp->ex_masklen;
+	}
+	i = saddr->sa_family;
+	if ((rnh = nep->ne_rtable[i]) == 0) {
+		/*
+		 * Seems silly to initialize every AF when most are not
+		 * used, do so on demand here
+		 */
+		for (dom = domains; dom; dom = dom->dom_next)
+			if (dom->dom_family == i && dom->dom_rtattach) {
+				dom->dom_rtattach((void **)&nep->ne_rtable[i],
+					dom->dom_rtoffset);
+				break;
+			}
+		if ((rnh = nep->ne_rtable[i]) == 0) {
+			error = ENOBUFS;
+			goto out;
+		}
+	}
+	rn = (*rnh->rnh_addaddr)((caddr_t)saddr, (caddr_t)smask, rnh,
+		np->netc_rnodes);
+	if (rn == 0) {
+		/*
+		 * One of the reasons that rnh_addaddr may fail is that
+		 * the entry already exists. To check for this case, we
+		 * look up the entry to see if it is there. If so, we
+		 * do not need to make a new entry but do return success.
+		 */
+		free(np, M_NETADDR);
+		rn = (*rnh->rnh_matchaddr)((caddr_t)saddr, rnh);
+		if (rn != 0 && (rn->rn_flags & RNF_ROOT) == 0 &&
+		    ((struct netcred *)rn)->netc_exflags == argp->ex_flags &&
+		    !bcmp((caddr_t)&((struct netcred *)rn)->netc_anon,
+			    (caddr_t)&argp->ex_anon, sizeof(struct ucred)))
+			return (0);
+		return (EPERM);
+	}
+	np->netc_exflags = argp->ex_flags;
+	np->netc_anon = argp->ex_anon;
+	np->netc_anon.cr_ref = 1;
+	return (0);
+out:
+	free(np, M_NETADDR);
+	return (error);
+}
+
+/* ARGSUSED */
+static int
+vfs_free_netcred(rn, w)
+	struct radix_node *rn;
+	caddr_t w;
+{
+	register struct radix_node_head *rnh = (struct radix_node_head *)w;
+
+	(*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh);
+	free((caddr_t)rn, M_NETADDR);
+	return (0);
+}
+
+/*
+ * Free the net address hash lists that are hanging off the mount points.
+ */
+static void
+vfs_free_addrlist(nep)
+	struct netexport *nep;
+{
+	register int i;
+	register struct radix_node_head *rnh;
+
+	for (i = 0; i <= AF_MAX; i++)
+		if (rnh = nep->ne_rtable[i]) {
+			(*rnh->rnh_walktree)(rnh, vfs_free_netcred,
+			    (caddr_t)rnh);
+			free((caddr_t)rnh, M_RTABLE);
+			nep->ne_rtable[i] = 0;
+		}
+}
+
+int
+vfs_export(mp, nep, argp)
+	struct mount *mp;
+	struct netexport *nep;
+	struct export_args *argp;
+{
+	int error;
+
+	if (argp->ex_flags & MNT_DELEXPORT) {
+		vfs_free_addrlist(nep);
+		mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
+	}
+	if (argp->ex_flags & MNT_EXPORTED) {
+		if (error = vfs_hang_addrlist(mp, nep, argp))
+			return (error);
+		mp->mnt_flag |= MNT_EXPORTED;
+	}
+	return (0);
+}
+
+struct netcred *
+vfs_export_lookup(mp, nep, nam)
+	register struct mount *mp;
+	struct netexport *nep;
+	struct mbuf *nam;
+{
+	register struct netcred *np;
+	register struct radix_node_head *rnh;
+	struct sockaddr *saddr;
+
+	np = NULL;
+	if (mp->mnt_flag & MNT_EXPORTED) {
+		/*
+		 * Lookup in the export list first.
+		 */
+		if (nam != NULL) {
+			saddr = mtod(nam, struct sockaddr *);
+			rnh = nep->ne_rtable[saddr->sa_family];
+			if (rnh != NULL) {
+				np = (struct netcred *)
+					(*rnh->rnh_matchaddr)((caddr_t)saddr,
+							      rnh);
+				if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
+					np = NULL;
+			}
+		}
+		/*
+		 * If no address match, use the default if it exists.
+		 */
+		if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
+			np = &nep->ne_defexported;
+	}
+	return (np);
 }