Index: sys/fs/tmpfs/tmpfs.h
===================================================================
--- sys/fs/tmpfs/tmpfs.h
+++ sys/fs/tmpfs/tmpfs.h
@@ -502,6 +502,8 @@
  * specific ones.
  */
 
+#define VP_TMPFS_ISRO(vp)	((vp)->v_mount->mnt_flag & MNT_RDONLY)
+
 static inline struct tmpfs_mount *
 VFS_TO_TMPFS(struct mount *mp)
 {
Index: sys/fs/tmpfs/tmpfs_subr.c
===================================================================
--- sys/fs/tmpfs/tmpfs_subr.c
+++ sys/fs/tmpfs/tmpfs_subr.c
@@ -1509,7 +1509,7 @@
 		return (EOPNOTSUPP);
 
 	/* Disallow this operation if the file system is mounted read-only. */
-	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+	if (VP_TMPFS_ISRO(vp))
 		return EROFS;
 
 	/*
@@ -1559,7 +1559,7 @@
 	node = VP_TO_TMPFS_NODE(vp);
 
 	/* Disallow this operation if the file system is mounted read-only. */
-	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+	if (VP_TMPFS_ISRO(vp))
 		return EROFS;
 
 	/* Immutable or append-only files cannot be modified, either. */
@@ -1628,7 +1628,7 @@
 	MPASS(uid != VNOVAL && gid != VNOVAL);
 
 	/* Disallow this operation if the file system is mounted read-only. */
-	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+	if (VP_TMPFS_ISRO(vp))
 		return EROFS;
 
 	/* Immutable or append-only files cannot be modified, either. */
@@ -1693,7 +1693,7 @@
 		return EISDIR;
 
 	case VREG:
-		if (vp->v_mount->mnt_flag & MNT_RDONLY)
+		if (VP_TMPFS_ISRO(vp))
 			return EROFS;
 		break;
 
@@ -1742,7 +1742,7 @@
 	node = VP_TO_TMPFS_NODE(vp);
 
 	/* Disallow this operation if the file system is mounted read-only. */
-	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+	if (VP_TMPFS_ISRO(vp))
 		return EROFS;
 
 	/* Immutable or append-only files cannot be modified, either. */
@@ -1823,7 +1823,8 @@
 tmpfs_update(struct vnode *vp)
 {
 
-	tmpfs_itimes(vp, NULL, NULL);
+	if (!VP_TMPFS_ISRO(vp))
+		tmpfs_itimes(vp, NULL, NULL);
 }
 
 int
Index: sys/fs/tmpfs/tmpfs_vnops.c
===================================================================
--- sys/fs/tmpfs/tmpfs_vnops.c
+++ sys/fs/tmpfs/tmpfs_vnops.c
@@ -339,7 +339,7 @@
 	case VLNK:
 		/* FALLTHROUGH */
 	case VREG:
-		if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) {
+		if (accmode & VWRITE && VP_TMPFS_ISRO(vp)) {
 			error = EROFS;
 			goto out;
 		}