move the specfs code to a place people can see it; ok guenther thib krw

1 files changed, 93 insertions, 3 deletions

diff --git a/sys/kern/spec_vnops.c b/sys/kern/spec_vnops.c
index faae895fb1f..46e94768ccf 100644
--- a/sys/kern/spec_vnops.c
+++ b/sys/kern/spec_vnops.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: spec_vnops.c,v 1.65 2011/07/04 17:12:53 nicm Exp $	*/
+/*	$OpenBSD: spec_vnops.c,v 1.66 2011/07/04 20:51:19 deraadt Exp $	*/
 /*	$NetBSD: spec_vnops.c,v 1.29 1996/04/22 01:42:38 christos Exp $	*/
 
 /*
@@ -49,8 +49,8 @@
 #include <sys/lockf.h>
 #include <sys/poll.h>
 #include <sys/dkio.h>
-
-#include <miscfs/specfs/specdev.h>
+#include <sys/malloc.h>
+#include <sys/specdev.h>
 
 #define v_lastr v_specinfo->si_lastr
 
@@ -652,3 +652,93 @@ spec_badop(void *v)
 	panic("spec_badop called");
 	/* NOTREACHED */
 }
+
+/*
+ * Copyright (c) 2006 Pedro Martelletto <pedro@ambientworks.net>
+ * Copyright (c) 2006 Thordur Bjornsson <thib@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifdef	CLONE_DEBUG
+#define	DNPRINTF(m...)	do { printf(m);  } while (0)
+#else
+#define	DNPRINTF(m...)	/* nothing */
+#endif
+
+int
+spec_open_clone(struct vop_open_args *ap)
+{
+	struct vnode *cvp, *vp = ap->a_vp;
+	struct cloneinfo *cip;
+	int error, i;
+
+	DNPRINTF("cloning vnode\n");
+
+	for (i = 1; i < sizeof(vp->v_specbitmap) * NBBY; i++)
+		if (isclr(vp->v_specbitmap, i)) {
+			setbit(vp->v_specbitmap, i);
+			break;
+		}
+
+	if (i == sizeof(vp->v_specbitmap) * NBBY)
+		return (EBUSY); /* too many open instances */
+
+	error = cdevvp(makedev(major(vp->v_rdev), i), &cvp);
+	if (error)
+		return (error); /* out of vnodes */
+
+	VOP_UNLOCK(vp, 0, ap->a_p);
+
+	error = cdevsw[major(vp->v_rdev)].d_open(cvp->v_rdev, ap->a_mode,
+	    S_IFCHR, ap->a_p);
+
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_p);
+
+	if (error) {
+		 clrbit(vp->v_specbitmap, i);
+		 return (error); /* device open failed */
+	}
+
+	cvp->v_flag |= VCLONE;
+
+	cip = malloc(sizeof(struct cloneinfo), M_TEMP, M_WAITOK);
+	cip->ci_data = vp->v_data;
+	cip->ci_vp = cvp;
+
+	cvp->v_specparent = vp;
+	vp->v_flag |= VCLONED;
+	vp->v_data = cip;
+
+	DNPRINTF("clone of vnode %p is vnode %p\n", vp, cvp);
+
+	return (0); /* device cloned */
+}
+
+int
+spec_close_clone(struct vop_close_args *ap)
+{
+	struct vnode *pvp, *vp = ap->a_vp;
+	int error;
+
+	error = cdevsw[major(vp->v_rdev)].d_close(vp->v_rdev, ap->a_fflag,
+	    S_IFCHR, ap->a_p);
+	if (error)
+		return (error); /* device close failed */
+
+	pvp = vp->v_specparent; /* get parent device */
+	clrbit(pvp->v_specbitmap, minor(vp->v_rdev));
+	vrele(pvp);
+
+	return (0); /* clone closed */
+}