diff --git a/sys/fs/cd9660/cd9660_node.h b/sys/fs/cd9660/cd9660_node.h
index e099763f8ab5..7d8fc813a787 100644
--- a/sys/fs/cd9660/cd9660_node.h
+++ b/sys/fs/cd9660/cd9660_node.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: cd9660_node.h,v 1.9 2005/11/02 12:38:58 yamt Exp $	*/
+/*	$NetBSD: cd9660_node.h,v 1.10 2005/11/11 15:50:57 yamt Exp $	*/
 
 /*-
  * Copyright (c) 1994
@@ -129,6 +129,7 @@ int	cd9660_strategy(void *);
 int	cd9660_print(void *);
 int	cd9660_islocked(void *);
 int	cd9660_pathconf(void *);
+int	cd9660_setattr(void *);
 
 int	cd9660_blkatoff(struct vnode *, off_t, char **, struct buf **);
 void	cd9660_defattr(struct iso_directory_record *,
diff --git a/sys/fs/cd9660/cd9660_vnops.c b/sys/fs/cd9660/cd9660_vnops.c
index 8cadd320a9cd..c79a649c2c06 100644
--- a/sys/fs/cd9660/cd9660_vnops.c
+++ b/sys/fs/cd9660/cd9660_vnops.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: cd9660_vnops.c,v 1.16 2005/11/02 12:38:58 yamt Exp $	*/
+/*	$NetBSD: cd9660_vnops.c,v 1.17 2005/11/11 15:50:57 yamt Exp $	*/
 
 /*-
  * Copyright (c) 1994
@@ -37,7 +37,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cd9660_vnops.c,v 1.16 2005/11/02 12:38:58 yamt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cd9660_vnops.c,v 1.17 2005/11/11 15:50:57 yamt Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -836,6 +836,51 @@ cd9660_pathconf(v)
 	/* NOTREACHED */
 }
 
+/*
+ * Allow changing the size for special files (and fifos).
+ */
+int
+cd9660_setattr(v)
+	void *v;
+{
+	struct vop_setattr_args /* {
+		struct vnodeop_desc *a_desc;
+		struct vnode *a_vp;
+		struct vattr *a_vap;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap = v;
+	struct vattr *vap = ap->a_vap;
+	struct vnode *vp = ap->a_vp;
+
+	/*
+	 * Only size is changeable.
+	 */
+	if (vap->va_type != VNON
+	    || vap->va_nlink != (nlink_t)VNOVAL
+	    || vap->va_fsid != VNOVAL
+	    || vap->va_fileid != VNOVAL
+	    || vap->va_blocksize != VNOVAL
+	    || vap->va_rdev != (dev_t)VNOVAL
+	    || (int)vap->va_bytes != VNOVAL
+	    || vap->va_gen != VNOVAL
+	    || vap->va_flags != VNOVAL
+	    || vap->va_uid != (uid_t)VNOVAL
+	    || vap->va_gid != (gid_t)VNOVAL
+	    || vap->va_atime.tv_sec != VNOVAL
+	    || vap->va_mtime.tv_sec != VNOVAL
+	    || vap->va_mode != (mode_t)VNOVAL)
+		return EOPNOTSUPP;
+
+	if (vap->va_size != VNOVAL
+	    && vp->v_type != VCHR
+	    && vp->v_type != VBLK
+	    && vp->v_type != VFIFO)
+		return EOPNOTSUPP;
+
+	return 0;
+}
+
 /*
  * Global vfs data structures for isofs
  */
@@ -851,7 +896,6 @@ cd9660_pathconf(v)
 #define	cd9660_advlock	genfs_einval
 #define	cd9660_bwrite	genfs_eopnotsupp
 #define cd9660_revoke	genfs_revoke
-#define	cd9660_setattr	genfs_eopnotsupp
 
 /*
  * Global vfs data structures for cd9660
diff --git a/sys/fs/tmpfs/tmpfs_subr.c b/sys/fs/tmpfs/tmpfs_subr.c
index e1eb9ef365e5..9e7a0ecd9668 100644
--- a/sys/fs/tmpfs/tmpfs_subr.c
+++ b/sys/fs/tmpfs/tmpfs_subr.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: tmpfs_subr.c,v 1.13 2005/11/08 23:04:03 yamt Exp $	*/
+/*	$NetBSD: tmpfs_subr.c,v 1.14 2005/11/11 15:50:57 yamt Exp $	*/
 
 /*
  * Copyright (c) 2005 The NetBSD Foundation, Inc.
@@ -42,7 +42,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tmpfs_subr.c,v 1.13 2005/11/08 23:04:03 yamt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tmpfs_subr.c,v 1.14 2005/11/11 15:50:57 yamt Exp $");
 
 #include <sys/param.h>
 #include <sys/dirent.h>
@@ -1141,8 +1141,6 @@ tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred,
 	case VDIR:
 		return EISDIR;
 
-	case VLNK:
-		/* FALLTHROUGH */
 	case VREG:
 		if (vp->v_mount->mnt_flag & MNT_RDONLY)
 			return EROFS;
@@ -1152,17 +1150,15 @@ tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred,
 		/* FALLTHROUGH */
 	case VCHR:
 		/* FALLTHROUGH */
-	case VSOCK:
-		/* FALLTHROUGH */
 	case VFIFO:
 		/* Allow modifications of special files even if in the file
 		 * system is mounted read-only (we are not modifying the
 		 * files themselves, but the objects they represent). */
-		break;
+		return 0;
 
 	default:
 		/* Anything else is unsupported. */
-		return EINVAL;
+		return EOPNOTSUPP;
 	}
 
 	/* Immutable or append-only files cannot be modified, either. */
diff --git a/sys/ufs/ext2fs/ext2fs_inode.c b/sys/ufs/ext2fs/ext2fs_inode.c
index bd3d749d09fe..caca35ebc456 100644
--- a/sys/ufs/ext2fs/ext2fs_inode.c
+++ b/sys/ufs/ext2fs/ext2fs_inode.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ext2fs_inode.c,v 1.50 2005/11/02 12:39:00 yamt Exp $	*/
+/*	$NetBSD: ext2fs_inode.c,v 1.51 2005/11/11 15:50:57 yamt Exp $	*/
 
 /*
  * Copyright (c) 1982, 1986, 1989, 1993
@@ -65,7 +65,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ext2fs_inode.c,v 1.50 2005/11/02 12:39:00 yamt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ext2fs_inode.c,v 1.51 2005/11/11 15:50:57 yamt Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -262,6 +262,11 @@ ext2fs_truncate(struct vnode *ovp, off_t length, int ioflag,
 	int sync;
 	struct ufsmount *ump = oip->i_ump;
 
+	if (ovp->v_type == VCHR || ovp->v_type == VBLK ||
+	    ovp->v_type == VFIFO || ovp->v_type == VSOCK) {
+		return 0;
+	}
+
 	if (length < 0)
 		return (EINVAL);
 
diff --git a/sys/ufs/ffs/ffs_inode.c b/sys/ufs/ffs/ffs_inode.c
index 36b8fb5116f1..4b94f92d02d7 100644
--- a/sys/ufs/ffs/ffs_inode.c
+++ b/sys/ufs/ffs/ffs_inode.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ffs_inode.c,v 1.77 2005/11/02 12:39:00 yamt Exp $	*/
+/*	$NetBSD: ffs_inode.c,v 1.78 2005/11/11 15:50:57 yamt Exp $	*/
 
 /*
  * Copyright (c) 1982, 1986, 1989, 1993
@@ -32,7 +32,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ffs_inode.c,v 1.77 2005/11/02 12:39:00 yamt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ffs_inode.c,v 1.78 2005/11/11 15:50:57 yamt Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_ffs.h"
@@ -180,6 +180,12 @@ ffs_truncate(struct vnode *ovp, off_t length, int ioflag, struct ucred *cred,
 	int sync;
 	struct ufsmount *ump = oip->i_ump;
 
+	if (ovp->v_type == VCHR || ovp->v_type == VBLK ||
+	    ovp->v_type == VFIFO || ovp->v_type == VSOCK) {
+		KASSERT(oip->i_size == 0);
+		return 0;
+	}
+
 	if (length < 0)
 		return (EINVAL);
 
diff --git a/sys/ufs/lfs/lfs_inode.c b/sys/ufs/lfs/lfs_inode.c
index aa1abd668895..91aac47fe8d3 100644
--- a/sys/ufs/lfs/lfs_inode.c
+++ b/sys/ufs/lfs/lfs_inode.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: lfs_inode.c,v 1.98 2005/11/02 12:39:14 yamt Exp $	*/
+/*	$NetBSD: lfs_inode.c,v 1.99 2005/11/11 15:50:57 yamt Exp $	*/
 
 /*-
  * Copyright (c) 1999, 2000, 2001, 2002, 2003 The NetBSD Foundation, Inc.
@@ -67,7 +67,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: lfs_inode.c,v 1.98 2005/11/02 12:39:14 yamt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: lfs_inode.c,v 1.99 2005/11/11 15:50:57 yamt Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_quota.h"
@@ -223,6 +223,12 @@ lfs_truncate(struct vnode *ovp, off_t length, int ioflag,
 	int usepc;
 	struct ufsmount *ump = oip->i_ump;
 
+	if (ovp->v_type == VCHR || ovp->v_type == VBLK ||
+	    ovp->v_type == VFIFO || ovp->v_type == VSOCK) {
+		KASSERT(oip->i_size == 0);
+		return 0;
+	}
+
 	if (length < 0)
 		return (EINVAL);
 
diff --git a/sys/ufs/ufs/ufs_vnops.c b/sys/ufs/ufs/ufs_vnops.c
index 40df087da761..fb07e4465cea 100644
--- a/sys/ufs/ufs/ufs_vnops.c
+++ b/sys/ufs/ufs/ufs_vnops.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ufs_vnops.c,v 1.136 2005/11/02 12:39:14 yamt Exp $	*/
+/*	$NetBSD: ufs_vnops.c,v 1.137 2005/11/11 15:50:57 yamt Exp $	*/
 
 /*
  * Copyright (c) 1982, 1986, 1989, 1993, 1995
@@ -37,7 +37,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ufs_vnops.c,v 1.136 2005/11/02 12:39:14 yamt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ufs_vnops.c,v 1.137 2005/11/11 15:50:57 yamt Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_ffs.h"
@@ -435,19 +435,22 @@ ufs_setattr(void *v)
 		switch (vp->v_type) {
 		case VDIR:
 			return (EISDIR);
-		case VLNK:
+		case VCHR:
+		case VBLK:
+		case VFIFO:
+			break;
 		case VREG:
 			if (vp->v_mount->mnt_flag & MNT_RDONLY)
 				 return (EROFS);
 			if ((ip->i_flags & SF_SNAPSHOT) != 0)
 				return (EPERM);
+			error = UFS_TRUNCATE(vp, vap->va_size, 0, cred, p);
+			if (error)
+				return (error);
 			break;
 		default:
-			break;
+			return (EOPNOTSUPP);
 		}
-		error = UFS_TRUNCATE(vp, vap->va_size, 0, cred, p);
-		if (error)
-			return (error);
 	}
 	ip = VTOI(vp);
 	if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL ||