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diff --git a/sys/sys/specdev.h b/sys/sys/specdev.h
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+/* $OpenBSD: specdev.h,v 1.39 2019/12/27 22:17:01 bluhm Exp $ */
+/* $NetBSD: specdev.h,v 1.12 1996/02/13 13:13:01 mycroft Exp $ */
+
+/*
+ * Copyright (c) 1990, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)specdev.h 8.3 (Berkeley) 8/10/94
+ */
+
+SLIST_HEAD(vnodechain, vnode);
+
+/*
+ * This structure defines the information maintained about
+ * special devices. It is allocated in checkalias and freed
+ * in vgone.
+ */
+struct specinfo {
+ struct vnodechain *si_hashchain;
+ SLIST_ENTRY(vnode) si_specnext;
+ struct mount *si_mountpoint;
+ dev_t si_rdev;
+ struct lockf_state *si_lockf;
+ daddr_t si_lastr;
+ union {
+ struct vnode *ci_parent; /* pointer back to parent device */
+ u_int8_t *ci_bitmap; /* bitmap of devices cloned off us */
+ } si_ci;
+};
+
+struct cloneinfo {
+ struct vnode *ci_vp; /* cloned vnode */
+ void *ci_data; /* original vnode's v_data */
+};
+
+/*
+ * Exported shorthand
+ */
+#define v_rdev v_specinfo->si_rdev
+#define v_hashchain v_specinfo->si_hashchain
+#define v_specnext v_specinfo->si_specnext
+#define v_specmountpoint v_specinfo->si_mountpoint
+#define v_speclockf v_specinfo->si_lockf
+#define v_specparent v_specinfo->si_ci.ci_parent
+#define v_specbitmap v_specinfo->si_ci.ci_bitmap
+
+/*
+ * We use the upper 16 bits of the minor to record the clone instance.
+ * This gives us 8 bits for encoding the real minor number.
+ */
+#define CLONE_SHIFT 8
+#define CLONE_MAPSZ 128
+
+/*
+ * Special device management
+ */
+#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
+
+#ifdef _KERNEL
+
+extern struct vnodechain speclisth[SPECHSZ];
+
+/*
+ * Prototypes for special file operations on vnodes.
+ */
+int spec_badop(void *);
+int spec_getattr(void *);
+int spec_setattr(void *);
+int spec_access(void *);
+int spec_open(void *);
+int spec_close(void *);
+int spec_read(void *);
+int spec_write(void *);
+int spec_ioctl(void *);
+int spec_poll(void *);
+int spec_kqfilter(void *);
+int spec_fsync(void *);
+int spec_inactive(void *);
+int spec_strategy(void *);
+int spec_print(void *);
+int spec_pathconf(void *);
+int spec_advlock(void *);
+
+#endif /* _KERNEL */