1 files changed, 296 insertions, 0 deletions
diff --git a/sys/fs/deadfs/dead_vnops.c b/sys/fs/deadfs/dead_vnops.c
new file mode 100644
index 0000000..f9acbd0
--- /dev/null
+++ b/sys/fs/deadfs/dead_vnops.c
@@ -0,0 +1,296 @@
+/*
+ * Copyright (c) 1989, 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ *
+ *	@(#)dead_vnops.c	8.1 (Berkeley) 6/10/93
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/vnode.h>
+#include <sys/buf.h>
+#include <sys/poll.h>
+
+static int	chkvnlock __P((struct vnode *));
+/*
+ * Prototypes for dead operations on vnodes.
+ */
+static int	dead_badop __P((void));
+static int	dead_bmap __P((struct vop_bmap_args *));
+static int	dead_ioctl __P((struct vop_ioctl_args *));
+static int	dead_lock __P((struct vop_lock_args *));
+static int	dead_lookup __P((struct vop_lookup_args *));
+static int	dead_open __P((struct vop_open_args *));
+static int	dead_poll __P((struct vop_poll_args *));
+static int	dead_print __P((struct vop_print_args *));
+static int	dead_read __P((struct vop_read_args *));
+static int	dead_write __P((struct vop_write_args *));
+
+vop_t **dead_vnodeop_p;
+static struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
+	{ &vop_default_desc,		(vop_t *) vop_defaultop },
+	{ &vop_access_desc,		(vop_t *) vop_ebadf },
+	{ &vop_advlock_desc,		(vop_t *) vop_ebadf },
+	{ &vop_bmap_desc,		(vop_t *) dead_bmap },
+	{ &vop_create_desc,		(vop_t *) dead_badop },
+	{ &vop_getattr_desc,		(vop_t *) vop_ebadf },
+	{ &vop_inactive_desc,		(vop_t *) vop_null },
+	{ &vop_ioctl_desc,		(vop_t *) dead_ioctl },
+	{ &vop_link_desc,		(vop_t *) dead_badop },
+	{ &vop_lock_desc,		(vop_t *) dead_lock },
+	{ &vop_lookup_desc,		(vop_t *) dead_lookup },
+	{ &vop_mkdir_desc,		(vop_t *) dead_badop },
+	{ &vop_mknod_desc,		(vop_t *) dead_badop },
+	{ &vop_mmap_desc,		(vop_t *) dead_badop },
+	{ &vop_open_desc,		(vop_t *) dead_open },
+	{ &vop_pathconf_desc,		(vop_t *) vop_ebadf },	/* per pathconf(2) */
+	{ &vop_poll_desc,		(vop_t *) dead_poll },
+	{ &vop_print_desc,		(vop_t *) dead_print },
+	{ &vop_read_desc,		(vop_t *) dead_read },
+	{ &vop_readdir_desc,		(vop_t *) vop_ebadf },
+	{ &vop_readlink_desc,		(vop_t *) vop_ebadf },
+	{ &vop_reclaim_desc,		(vop_t *) vop_null },
+	{ &vop_remove_desc,		(vop_t *) dead_badop },
+	{ &vop_rename_desc,		(vop_t *) dead_badop },
+	{ &vop_rmdir_desc,		(vop_t *) dead_badop },
+	{ &vop_setattr_desc,		(vop_t *) vop_ebadf },
+	{ &vop_symlink_desc,		(vop_t *) dead_badop },
+	{ &vop_write_desc,		(vop_t *) dead_write },
+	{ NULL, NULL }
+};
+static struct vnodeopv_desc dead_vnodeop_opv_desc =
+	{ &dead_vnodeop_p, dead_vnodeop_entries };
+
+VNODEOP_SET(dead_vnodeop_opv_desc);
+
+/*
+ * Trivial lookup routine that always fails.
+ */
+/* ARGSUSED */
+static int
+dead_lookup(ap)
+	struct vop_lookup_args /* {
+		struct vnode * a_dvp;
+		struct vnode ** a_vpp;
+		struct componentname * a_cnp;
+	} */ *ap;
+{
+
+	*ap->a_vpp = NULL;
+	return (ENOTDIR);
+}
+
+/*
+ * Open always fails as if device did not exist.
+ */
+/* ARGSUSED */
+static int
+dead_open(ap)
+	struct vop_open_args /* {
+		struct vnode *a_vp;
+		int  a_mode;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+
+	return (ENXIO);
+}
+
+/*
+ * Vnode op for read
+ */
+/* ARGSUSED */
+static int
+dead_read(ap)
+	struct vop_read_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		int  a_ioflag;
+		struct ucred *a_cred;
+	} */ *ap;
+{
+
+	if (chkvnlock(ap->a_vp))
+		panic("dead_read: lock");
+	/*
+	 * Return EOF for tty devices, EIO for others
+	 */
+	if ((ap->a_vp->v_flag & VISTTY) == 0)
+		return (EIO);
+	return (0);
+}
+
+/*
+ * Vnode op for write
+ */
+/* ARGSUSED */
+static int
+dead_write(ap)
+	struct vop_write_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		int  a_ioflag;
+		struct ucred *a_cred;
+	} */ *ap;
+{
+
+	if (chkvnlock(ap->a_vp))
+		panic("dead_write: lock");
+	return (EIO);
+}
+
+/*
+ * Device ioctl operation.
+ */
+/* ARGSUSED */
+static int
+dead_ioctl(ap)
+	struct vop_ioctl_args /* {
+		struct vnode *a_vp;
+		int  a_command;
+		caddr_t  a_data;
+		int  a_fflag;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+
+	if (!chkvnlock(ap->a_vp))
+		return (ENOTTY);
+	return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap));
+}
+
+
+/*
+ * Wait until the vnode has finished changing state.
+ */
+static int
+dead_lock(ap)
+	struct vop_lock_args /* {
+		struct vnode *a_vp;
+		int a_flags;
+		struct proc *a_p;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+
+	/*
+	 * Since we are not using the lock manager, we must clear
+	 * the interlock here.
+	 */
+	if (ap->a_flags & LK_INTERLOCK) {
+		simple_unlock(&vp->v_interlock);
+		ap->a_flags &= ~LK_INTERLOCK;
+	}
+	if (!chkvnlock(vp))
+		return (0);
+	return (VCALL(vp, VOFFSET(vop_lock), ap));
+}
+
+/*
+ * Wait until the vnode has finished changing state.
+ */
+static int
+dead_bmap(ap)
+	struct vop_bmap_args /* {
+		struct vnode *a_vp;
+		daddr_t  a_bn;
+		struct vnode **a_vpp;
+		daddr_t *a_bnp;
+		int *a_runp;
+		int *a_runb;
+	} */ *ap;
+{
+
+	if (!chkvnlock(ap->a_vp))
+		return (EIO);
+	return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp, ap->a_runb));
+}
+
+/*
+ * Print out the contents of a dead vnode.
+ */
+/* ARGSUSED */
+static int
+dead_print(ap)
+	struct vop_print_args /* {
+		struct vnode *a_vp;
+	} */ *ap;
+{
+
+	printf("tag VT_NON, dead vnode\n");
+	return (0);
+}
+
+/*
+ * Empty vnode bad operation
+ */
+static int
+dead_badop()
+{
+
+	panic("dead_badop called");
+	/* NOTREACHED */
+}
+
+/*
+ * We have to wait during times when the vnode is
+ * in a state of change.
+ */
+int
+chkvnlock(vp)
+	register struct vnode *vp;
+{
+	int locked = 0;
+
+	while (vp->v_flag & VXLOCK) {
+		vp->v_flag |= VXWANT;
+		(void) tsleep((caddr_t)vp, PINOD, "ckvnlk", 0);
+		locked = 1;
+	}
+	return (locked);
+}
+
+/*
+ * Trivial poll routine that always returns POLLHUP.
+ * This is necessary so that a process which is polling a file
+ * gets notified when that file is revoke()d.
+ */
+static int
+dead_poll(ap)
+	struct vop_poll_args *ap;
+{
+	return (POLLHUP);
+}