diff --git a/sys/fs/ext2fs/ext2_inode.c b/sys/fs/ext2fs/ext2_inode.c
index 8d477b2a3547..93e59ddf9c9b 100644
--- a/sys/fs/ext2fs/ext2_inode.c
+++ b/sys/fs/ext2fs/ext2_inode.c
@@ -249,7 +249,7 @@ ext2_truncate(vp, length, flags, cred, td)
 	bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof(newblks));
 	bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof(oldblks));
 	oip->i_size = osize;
-	error = vtruncbuf(ovp, cred, td, length, (int)fs->e2fs_bsize);
+	error = vtruncbuf(ovp, cred, length, (int)fs->e2fs_bsize);
 	if (error && (allerror == 0))
 		allerror = error;
 	vnode_pager_setsize(ovp, length);
diff --git a/sys/fs/hpfs/hpfs_vnops.c b/sys/fs/hpfs/hpfs_vnops.c
index 38594787ded6..f3254887a327 100644
--- a/sys/fs/hpfs/hpfs_vnops.c
+++ b/sys/fs/hpfs/hpfs_vnops.c
@@ -528,7 +528,7 @@ hpfs_setattr(ap)
 		}
 
 		if (vap->va_size < hp->h_fn.fn_size) {
-			error = vtruncbuf(vp, cred, td, vap->va_size, DEV_BSIZE);
+			error = vtruncbuf(vp, cred, vap->va_size, DEV_BSIZE);
 			if (error)
 				return (error);
 			error = hpfs_truncate(hp, vap->va_size);
diff --git a/sys/fs/msdosfs/denode.h b/sys/fs/msdosfs/denode.h
index 4fd306cf620d..6446db3478d5 100644
--- a/sys/fs/msdosfs/denode.h
+++ b/sys/fs/msdosfs/denode.h
@@ -276,6 +276,6 @@ int dosdirempty(struct denode *dep);
 int createde(struct denode *dep, struct denode *ddep, struct denode **depp, struct componentname *cnp);
 int deupdat(struct denode *dep, int waitfor);
 int removede(struct denode *pdep, struct denode *dep);
-int detrunc(struct denode *dep, u_long length, int flags, struct ucred *cred, struct thread *td);
+int detrunc(struct denode *dep, u_long length, int flags, struct ucred *cred);
 int doscheckpath( struct denode *source, struct denode *target);
 #endif	/* _KERNEL */
diff --git a/sys/fs/msdosfs/msdosfs_denode.c b/sys/fs/msdosfs/msdosfs_denode.c
index 40ec87368217..339f06a60a6e 100644
--- a/sys/fs/msdosfs/msdosfs_denode.c
+++ b/sys/fs/msdosfs/msdosfs_denode.c
@@ -326,12 +326,11 @@ deupdat(dep, waitfor)
  * Truncate the file described by dep to the length specified by length.
  */
 int
-detrunc(dep, length, flags, cred, td)
+detrunc(dep, length, flags, cred)
 	struct denode *dep;
 	u_long length;
 	int flags;
 	struct ucred *cred;
-	struct thread *td;
 {
 	int error;
 	int allerror;
@@ -426,7 +425,7 @@ detrunc(dep, length, flags, cred, td)
 	dep->de_FileSize = length;
 	if (!isadir)
 		dep->de_flag |= DE_UPDATE | DE_MODIFIED;
-	allerror = vtruncbuf(DETOV(dep), cred, td, length, pmp->pm_bpcluster);
+	allerror = vtruncbuf(DETOV(dep), cred, length, pmp->pm_bpcluster);
 #ifdef MSDOSFS_DEBUG
 	if (allerror)
 		printf("detrunc(): vtruncbuf error %d\n", allerror);
@@ -504,7 +503,7 @@ deextend(dep, length, cred)
 		error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
 		if (error) {
 			/* truncate the added clusters away again */
-			(void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
+			(void) detrunc(dep, dep->de_FileSize, 0, cred);
 			return (error);
 		}
 	}
@@ -607,7 +606,7 @@ msdosfs_inactive(ap)
 	       dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
 #endif
 	if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
-		error = detrunc(dep, (u_long) 0, 0, NOCRED, td);
+		error = detrunc(dep, (u_long) 0, 0, NOCRED);
 		dep->de_flag |= DE_UPDATE;
 		dep->de_Name[0] = SLOT_DELETED;
 	}
diff --git a/sys/fs/msdosfs/msdosfs_lookup.c b/sys/fs/msdosfs/msdosfs_lookup.c
index b3f52cecbd32..d923c89886d9 100644
--- a/sys/fs/msdosfs/msdosfs_lookup.c
+++ b/sys/fs/msdosfs/msdosfs_lookup.c
@@ -649,7 +649,7 @@ createde(dep, ddep, depp, cnp)
 		dirclust = de_clcount(pmp, diroffset);
 		error = extendfile(ddep, dirclust, 0, 0, DE_CLEAR);
 		if (error) {
-			(void)detrunc(ddep, ddep->de_FileSize, 0, NOCRED, NULL);
+			(void)detrunc(ddep, ddep->de_FileSize, 0, NOCRED);
 			return error;
 		}
 
diff --git a/sys/fs/msdosfs/msdosfs_vnops.c b/sys/fs/msdosfs/msdosfs_vnops.c
index 838baf7320f7..a90ee8d102a3 100644
--- a/sys/fs/msdosfs/msdosfs_vnops.c
+++ b/sys/fs/msdosfs/msdosfs_vnops.c
@@ -476,7 +476,7 @@ msdosfs_setattr(ap)
 			 */
 			break;
 		}
-		error = detrunc(dep, vap->va_size, 0, cred, td);
+		error = detrunc(dep, vap->va_size, 0, cred);
 		if (error)
 			return error;
 	}
@@ -835,11 +835,11 @@ msdosfs_write(ap)
 errexit:
 	if (error) {
 		if (ioflag & IO_UNIT) {
-			detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL);
+			detrunc(dep, osize, ioflag & IO_SYNC, NOCRED);
 			uio->uio_offset -= resid - uio->uio_resid;
 			uio->uio_resid = resid;
 		} else {
-			detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL);
+			detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED);
 			if (uio->uio_resid != resid)
 				error = 0;
 		}
@@ -1429,7 +1429,6 @@ msdosfs_rmdir(ap)
 	struct vnode *dvp = ap->a_dvp;
 	struct componentname *cnp = ap->a_cnp;
 	struct denode *ip, *dp;
-	struct thread *td = cnp->cn_thread;
 	int error;
 
 	ip = VTODE(vp);
@@ -1467,7 +1466,7 @@ msdosfs_rmdir(ap)
 	/*
 	 * Truncate the directory that is being deleted.
 	 */
-	error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred, td);
+	error = detrunc(ip, (u_long)0, IO_SYNC, cnp->cn_cred);
 	cache_purge(vp);
 
 out:
diff --git a/sys/fs/nfsclient/nfs_clbio.c b/sys/fs/nfsclient/nfs_clbio.c
index 3efff8c1f287..a160d37094c9 100644
--- a/sys/fs/nfsclient/nfs_clbio.c
+++ b/sys/fs/nfsclient/nfs_clbio.c
@@ -1817,7 +1817,7 @@ ncl_meta_setsize(struct vnode *vp, struct ucred *cred, struct thread *td, u_quad
 		 * truncation point.  We may have a B_DELWRI and/or B_CACHE
 		 * buffer that now needs to be truncated.
 		 */
-		error = vtruncbuf(vp, cred, td, nsize, biosize);
+		error = vtruncbuf(vp, cred, nsize, biosize);
 		lbn = nsize / biosize;
 		bufsize = nsize & (biosize - 1);
 		bp = nfs_getcacheblk(vp, lbn, bufsize, td);
diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index d660262d55e8..d4523460e859 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -1327,8 +1327,7 @@ flushbuflist(struct bufv *bufv, int flags, struct bufobj *bo, int slpflag,
  * sync activity.
  */
 int
-vtruncbuf(struct vnode *vp, struct ucred *cred, struct thread *td,
-    off_t length, int blksize)
+vtruncbuf(struct vnode *vp, struct ucred *cred, off_t length, int blksize)
 {
 	struct buf *bp, *nbp;
 	int anyfreed;
diff --git a/sys/nfsclient/nfs_bio.c b/sys/nfsclient/nfs_bio.c
index e005fc88b261..90fe96ee0dff 100644
--- a/sys/nfsclient/nfs_bio.c
+++ b/sys/nfsclient/nfs_bio.c
@@ -1796,7 +1796,7 @@ nfs_meta_setsize(struct vnode *vp, struct ucred *cred, struct thread *td, u_quad
 		 * truncation point.  We may have a B_DELWRI and/or B_CACHE
 		 * buffer that now needs to be truncated.
 		 */
-		error = vtruncbuf(vp, cred, td, nsize, biosize);
+		error = vtruncbuf(vp, cred, nsize, biosize);
 		lbn = nsize / biosize;
 		bufsize = nsize & (biosize - 1);
 		bp = nfs_getcacheblk(vp, lbn, bufsize, td);
diff --git a/sys/sys/vnode.h b/sys/sys/vnode.h
index 352ebca8c527..5d1e9f5b5030 100644
--- a/sys/sys/vnode.h
+++ b/sys/sys/vnode.h
@@ -634,8 +634,8 @@ void	vhold(struct vnode *);
 void	vholdl(struct vnode *);
 void	vinactive(struct vnode *, struct thread *);
 int	vinvalbuf(struct vnode *vp, int save, int slpflag, int slptimeo);
-int	vtruncbuf(struct vnode *vp, struct ucred *cred, struct thread *td,
-	    off_t length, int blksize);
+int	vtruncbuf(struct vnode *vp, struct ucred *cred, off_t length,
+	    int blksize);
 void	vunref(struct vnode *);
 void	vn_printf(struct vnode *vp, const char *fmt, ...) __printflike(2,3);
 #define vprint(label, vp) vn_printf((vp), "%s\n", (label))
diff --git a/sys/ufs/ffs/ffs_extern.h b/sys/ufs/ffs/ffs_extern.h
index bb375714b078..4db351d4542a 100644
--- a/sys/ufs/ffs/ffs_extern.h
+++ b/sys/ufs/ffs/ffs_extern.h
@@ -93,7 +93,7 @@ void	ffs_snapshot_unmount(struct mount *mp);
 void	process_deferred_inactive(struct mount *mp);
 void	ffs_sync_snap(struct mount *, int);
 int	ffs_syncvnode(struct vnode *vp, int waitfor, int flags);
-int	ffs_truncate(struct vnode *, off_t, int, struct ucred *, struct thread *);
+int	ffs_truncate(struct vnode *, off_t, int, struct ucred *);
 int	ffs_update(struct vnode *, int);
 int	ffs_valloc(struct vnode *, int, struct ucred *, struct vnode **);
 
diff --git a/sys/ufs/ffs/ffs_inode.c b/sys/ufs/ffs/ffs_inode.c
index 6175ed83a4ff..f8584d539545 100644
--- a/sys/ufs/ffs/ffs_inode.c
+++ b/sys/ufs/ffs/ffs_inode.c
@@ -170,12 +170,11 @@ ffs_update(vp, waitfor)
  * disk blocks.
  */
 int
-ffs_truncate(vp, length, flags, cred, td)
+ffs_truncate(vp, length, flags, cred)
 	struct vnode *vp;
 	off_t length;
 	int flags;
 	struct ucred *cred;
-	struct thread *td;
 {
 	struct inode *ip;
 	ufs2_daddr_t bn, lbn, lastblock, lastiblock[NIADDR], indir_lbn[NIADDR];
@@ -449,7 +448,7 @@ ffs_truncate(vp, length, flags, cred, td)
 	ip->i_size = osize;
 	DIP_SET(ip, i_size, osize);
 
-	error = vtruncbuf(vp, cred, td, length, fs->fs_bsize);
+	error = vtruncbuf(vp, cred, length, fs->fs_bsize);
 	if (error && (allerror == 0))
 		allerror = error;
 
diff --git a/sys/ufs/ffs/ffs_snapshot.c b/sys/ufs/ffs/ffs_snapshot.c
index c7449f06cc6e..9d03f0347b23 100644
--- a/sys/ufs/ffs/ffs_snapshot.c
+++ b/sys/ufs/ffs/ffs_snapshot.c
@@ -850,7 +850,7 @@ ffs_snapshot(mp, snapfile)
 	mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
 	MNT_IUNLOCK(mp);
 	if (error)
-		(void) ffs_truncate(vp, (off_t)0, 0, NOCRED, td);
+		(void) ffs_truncate(vp, (off_t)0, 0, NOCRED);
 	(void) ffs_syncvnode(vp, MNT_WAIT, 0);
 	if (error)
 		vput(vp);
@@ -1989,7 +1989,7 @@ ffs_snapshot_mount(mp)
 				reason = "non-snapshot";
 			} else {
 				reason = "old format snapshot";
-				(void)ffs_truncate(vp, (off_t)0, 0, NOCRED, td);
+				(void)ffs_truncate(vp, (off_t)0, 0, NOCRED);
 				(void)ffs_syncvnode(vp, MNT_WAIT, 0);
 			}
 			printf("ffs_snapshot_mount: %s inode %d\n",
diff --git a/sys/ufs/ffs/ffs_vnops.c b/sys/ufs/ffs/ffs_vnops.c
index 44529915b9c0..0699eef37b8e 100644
--- a/sys/ufs/ffs/ffs_vnops.c
+++ b/sys/ufs/ffs/ffs_vnops.c
@@ -812,8 +812,7 @@ ffs_write(ap)
 	if (error) {
 		if (ioflag & IO_UNIT) {
 			(void)ffs_truncate(vp, osize,
-			    IO_NORMAL | (ioflag & IO_SYNC),
-			    ap->a_cred, uio->uio_td);
+			    IO_NORMAL | (ioflag & IO_SYNC), ap->a_cred);
 			uio->uio_offset -= resid - uio->uio_resid;
 			uio->uio_resid = resid;
 		}
@@ -1135,7 +1134,7 @@ ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *ucred)
 	if (error) {
 		if (ioflag & IO_UNIT) {
 			(void)ffs_truncate(vp, osize,
-			    IO_EXT | (ioflag&IO_SYNC), ucred, uio->uio_td);
+			    IO_EXT | (ioflag&IO_SYNC), ucred);
 			uio->uio_offset -= resid - uio->uio_resid;
 			uio->uio_resid = resid;
 		}
@@ -1326,7 +1325,7 @@ ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td
 		luio.uio_td = td;
 		/* XXX: I'm not happy about truncating to zero size */
 		if (ip->i_ea_len < dp->di_extsize)
-			error = ffs_truncate(vp, 0, IO_EXT, cred, td);
+			error = ffs_truncate(vp, 0, IO_EXT, cred);
 		error = ffs_extwrite(vp, &luio, IO_EXT | IO_SYNC, cred);
 	}
 	if (--ip->i_ea_refs == 0) {
diff --git a/sys/ufs/ufs/ufs_inode.c b/sys/ufs/ufs/ufs_inode.c
index 3acc5c83a2a5..bf4e2cbd6f88 100644
--- a/sys/ufs/ufs/ufs_inode.c
+++ b/sys/ufs/ufs/ufs_inode.c
@@ -129,8 +129,7 @@ ufs_inactive(ap)
 	if (ip->i_ump->um_fstype == UFS2)
 		isize += ip->i_din2->di_extsize;
 	if (ip->i_effnlink <= 0 && isize && !UFS_RDONLY(ip))
-		error = UFS_TRUNCATE(vp, (off_t)0, IO_EXT | IO_NORMAL,
-		    NOCRED, td);
+		error = UFS_TRUNCATE(vp, (off_t)0, IO_EXT | IO_NORMAL, NOCRED);
 	if (ip->i_nlink <= 0 && ip->i_mode && !UFS_RDONLY(ip)) {
 #ifdef QUOTA
 		if (!getinoquota(ip))
diff --git a/sys/ufs/ufs/ufs_lookup.c b/sys/ufs/ufs/ufs_lookup.c
index 56ca058776df..bcbda6e254d9 100644
--- a/sys/ufs/ufs/ufs_lookup.c
+++ b/sys/ufs/ufs/ufs_lookup.c
@@ -1133,7 +1133,7 @@ ufs_direnter(dvp, tvp, dirp, cnp, newdirbp, isrename)
 			ufsdirhash_dirtrunc(dp, dp->i_endoff);
 #endif
 		(void) UFS_TRUNCATE(dvp, (off_t)dp->i_endoff,
-		    IO_NORMAL | IO_SYNC, cr, td);
+		    IO_NORMAL | IO_SYNC, cr);
 		if (tvp != NULL)
 			vn_lock(tvp, LK_EXCLUSIVE | LK_RETRY);
 	}
diff --git a/sys/ufs/ufs/ufs_vnops.c b/sys/ufs/ufs/ufs_vnops.c
index 64fe3e4230ee..f55b51560cc7 100644
--- a/sys/ufs/ufs/ufs_vnops.c
+++ b/sys/ufs/ufs/ufs_vnops.c
@@ -621,7 +621,7 @@ ufs_setattr(ap)
 			return (0);
 		}
 		if ((error = UFS_TRUNCATE(vp, vap->va_size, IO_NORMAL,
-		    cred, td)) != 0)
+		    cred)) != 0)
 			return (error);
 	}
 	if (vap->va_atime.tv_sec != VNOVAL ||
@@ -1567,8 +1567,7 @@ ufs_rename(ap)
 		if (tdp->i_dirhash != NULL)
 			ufsdirhash_dirtrunc(tdp, endoff);
 #endif
-		UFS_TRUNCATE(tdvp, endoff, IO_NORMAL | IO_SYNC, tcnp->cn_cred,
-		    td);
+		UFS_TRUNCATE(tdvp, endoff, IO_NORMAL | IO_SYNC, tcnp->cn_cred);
 	}
 	if (error == 0 && tdp->i_flag & IN_NEEDSYNC)
 		error = VOP_FSYNC(tdvp, MNT_WAIT, td);
diff --git a/sys/ufs/ufs/ufsmount.h b/sys/ufs/ufs/ufsmount.h
index 6447dce0ac98..86a6d1477a93 100644
--- a/sys/ufs/ufs/ufsmount.h
+++ b/sys/ufs/ufs/ufsmount.h
@@ -100,7 +100,7 @@ struct ufsmount {
 	int	um_candelete;			/* devvp supports TRIM */
 	int	(*um_balloc)(struct vnode *, off_t, int, struct ucred *, int, struct buf **);
 	int	(*um_blkatoff)(struct vnode *, off_t, char **, struct buf **);
-	int	(*um_truncate)(struct vnode *, off_t, int, struct ucred *, struct thread *);
+	int	(*um_truncate)(struct vnode *, off_t, int, struct ucred *);
 	int	(*um_update)(struct vnode *, int);
 	int	(*um_valloc)(struct vnode *, int, struct ucred *, struct vnode **);
 	int	(*um_vfree)(struct vnode *, ino_t, int);
@@ -111,7 +111,7 @@ struct ufsmount {
 
 #define UFS_BALLOC(aa, bb, cc, dd, ee, ff) VFSTOUFS((aa)->v_mount)->um_balloc(aa, bb, cc, dd, ee, ff)
 #define UFS_BLKATOFF(aa, bb, cc, dd) VFSTOUFS((aa)->v_mount)->um_blkatoff(aa, bb, cc, dd)
-#define UFS_TRUNCATE(aa, bb, cc, dd, ee) VFSTOUFS((aa)->v_mount)->um_truncate(aa, bb, cc, dd, ee)
+#define UFS_TRUNCATE(aa, bb, cc, dd) VFSTOUFS((aa)->v_mount)->um_truncate(aa, bb, cc, dd)
 #define UFS_UPDATE(aa, bb) VFSTOUFS((aa)->v_mount)->um_update(aa, bb)
 #define UFS_VALLOC(aa, bb, cc, dd) VFSTOUFS((aa)->v_mount)->um_valloc(aa, bb, cc, dd)
 #define UFS_VFREE(aa, bb, cc) VFSTOUFS((aa)->v_mount)->um_vfree(aa, bb, cc)