Index: head/stand/libsa/cd9660.c
===================================================================
--- head/stand/libsa/cd9660.c
+++ head/stand/libsa/cd9660.c
@@ -66,8 +66,6 @@
 static int	cd9660_close(struct open_file *f);
 static int	cd9660_read(struct open_file *f, void *buf, size_t size,
 		    size_t *resid);
-static int	cd9660_write(struct open_file *f, const void *buf, size_t size,
-		    size_t *resid);
 static off_t	cd9660_seek(struct open_file *f, off_t offset, int where);
 static int	cd9660_stat(struct open_file *f, struct stat *sb);
 static int	cd9660_readdir(struct open_file *f, struct dirent *d);
@@ -86,7 +84,7 @@
 	cd9660_open,
 	cd9660_close,
 	cd9660_read,
-	cd9660_write,
+	null_write,
 	cd9660_seek,
 	cd9660_stat,
 	cd9660_readdir
@@ -554,13 +552,6 @@
 
 	fp->f_off += isonum_711(ep->length);
 	return (0);
-}
-
-static int
-cd9660_write(struct open_file *f __unused, const void *buf __unused,
-    size_t size __unused, size_t *resid __unused)
-{
-	return EROFS;
 }
 
 static off_t
Index: head/stand/libsa/nullfs.c
===================================================================
--- head/stand/libsa/nullfs.c
+++ head/stand/libsa/nullfs.c
@@ -85,7 +85,7 @@
 
 int	null_write (struct open_file *f, const void *buf, size_t size, size_t *resid)
 {
-	return EIO;
+	return EROFS;
 }
 
 off_t	null_seek (struct open_file *f, off_t offset, int where)
Index: head/stand/libsa/tftp.c
===================================================================
--- head/stand/libsa/tftp.c
+++ head/stand/libsa/tftp.c
@@ -69,8 +69,6 @@
 static int	tftp_close(struct open_file *f);
 static int	tftp_parse_oack(struct tftp_handle *h, char *buf, size_t len);
 static int	tftp_read(struct open_file *f, void *buf, size_t size, size_t *resid);
-static int	tftp_write(struct open_file *f, const void *buf, size_t size,
-		size_t *resid);
 static off_t	tftp_seek(struct open_file *f, off_t offset, int where);
 static int	tftp_set_blksize(struct tftp_handle *h, const char *str);
 static int	tftp_stat(struct open_file *f, struct stat *sb);
@@ -80,7 +78,7 @@
 	tftp_open,
 	tftp_close,
 	tftp_read,
-	tftp_write,
+	null_write,
 	tftp_seek,
 	tftp_stat,
 	null_readdir
@@ -572,13 +570,6 @@
 	}
 	is_open = 0;
 	return (0);
-}
-
-static int
-tftp_write(struct open_file *f __unused, const void *start __unused,
-    size_t size __unused, size_t *resid __unused /* out */)
-{
-	return (EROFS);
 }
 
 static int