1 files changed, 354 insertions, 0 deletions

diff --git a/sys/miscfs/deadfs/dead_vnops.c b/sys/miscfs/deadfs/dead_vnops.c
new file mode 100644
index 0000000..9d04652
--- /dev/null
+++ b/sys/miscfs/deadfs/dead_vnops.c
@@ -0,0 +1,354 @@
+/*
+ * 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
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/time.h>
+#include <sys/vnode.h>
+#include <sys/errno.h>
+#include <sys/namei.h>
+#include <sys/buf.h>
+
+/*
+ * Prototypes for dead operations on vnodes.
+ */
+int	dead_badop(),
+	dead_ebadf();
+int	dead_lookup __P((struct vop_lookup_args *));
+#define dead_create ((int (*) __P((struct  vop_create_args *)))dead_badop)
+#define dead_mknod ((int (*) __P((struct  vop_mknod_args *)))dead_badop)
+int	dead_open __P((struct vop_open_args *));
+#define dead_close ((int (*) __P((struct  vop_close_args *)))nullop)
+#define dead_access ((int (*) __P((struct  vop_access_args *)))dead_ebadf)
+#define dead_getattr ((int (*) __P((struct  vop_getattr_args *)))dead_ebadf)
+#define dead_setattr ((int (*) __P((struct  vop_setattr_args *)))dead_ebadf)
+int	dead_read __P((struct vop_read_args *));
+int	dead_write __P((struct vop_write_args *));
+int	dead_ioctl __P((struct vop_ioctl_args *));
+int	dead_select __P((struct vop_select_args *));
+#define dead_mmap ((int (*) __P((struct  vop_mmap_args *)))dead_badop)
+#define dead_fsync ((int (*) __P((struct  vop_fsync_args *)))nullop)
+#define dead_seek ((int (*) __P((struct  vop_seek_args *)))nullop)
+#define dead_remove ((int (*) __P((struct  vop_remove_args *)))dead_badop)
+#define dead_link ((int (*) __P((struct  vop_link_args *)))dead_badop)
+#define dead_rename ((int (*) __P((struct  vop_rename_args *)))dead_badop)
+#define dead_mkdir ((int (*) __P((struct  vop_mkdir_args *)))dead_badop)
+#define dead_rmdir ((int (*) __P((struct  vop_rmdir_args *)))dead_badop)
+#define dead_symlink ((int (*) __P((struct  vop_symlink_args *)))dead_badop)
+#define dead_readdir ((int (*) __P((struct  vop_readdir_args *)))dead_ebadf)
+#define dead_readlink ((int (*) __P((struct  vop_readlink_args *)))dead_ebadf)
+#define dead_abortop ((int (*) __P((struct  vop_abortop_args *)))dead_badop)
+#define dead_inactive ((int (*) __P((struct  vop_inactive_args *)))nullop)
+#define dead_reclaim ((int (*) __P((struct  vop_reclaim_args *)))nullop)
+int	dead_lock __P((struct vop_lock_args *));
+#define dead_unlock ((int (*) __P((struct  vop_unlock_args *)))nullop)
+int	dead_bmap __P((struct vop_bmap_args *));
+int	dead_strategy __P((struct vop_strategy_args *));
+int	dead_print __P((struct vop_print_args *));
+#define dead_islocked ((int (*) __P((struct  vop_islocked_args *)))nullop)
+#define dead_pathconf ((int (*) __P((struct  vop_pathconf_args *)))dead_ebadf)
+#define dead_advlock ((int (*) __P((struct  vop_advlock_args *)))dead_ebadf)
+#define dead_blkatoff ((int (*) __P((struct  vop_blkatoff_args *)))dead_badop)
+#define dead_valloc ((int (*) __P((struct  vop_valloc_args *)))dead_badop)
+#define dead_vfree ((int (*) __P((struct  vop_vfree_args *)))dead_badop)
+#define dead_truncate ((int (*) __P((struct  vop_truncate_args *)))nullop)
+#define dead_update ((int (*) __P((struct  vop_update_args *)))nullop)
+#define dead_bwrite ((int (*) __P((struct  vop_bwrite_args *)))nullop)
+
+int (**dead_vnodeop_p)();
+struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
+	{ &vop_default_desc, vn_default_error },
+	{ &vop_lookup_desc, dead_lookup },	/* lookup */
+	{ &vop_create_desc, dead_create },	/* create */
+	{ &vop_mknod_desc, dead_mknod },	/* mknod */
+	{ &vop_open_desc, dead_open },	/* open */
+	{ &vop_close_desc, dead_close },	/* close */
+	{ &vop_access_desc, dead_access },	/* access */
+	{ &vop_getattr_desc, dead_getattr },	/* getattr */
+	{ &vop_setattr_desc, dead_setattr },	/* setattr */
+	{ &vop_read_desc, dead_read },	/* read */
+	{ &vop_write_desc, dead_write },	/* write */
+	{ &vop_ioctl_desc, dead_ioctl },	/* ioctl */
+	{ &vop_select_desc, dead_select },	/* select */
+	{ &vop_mmap_desc, dead_mmap },	/* mmap */
+	{ &vop_fsync_desc, dead_fsync },	/* fsync */
+	{ &vop_seek_desc, dead_seek },	/* seek */
+	{ &vop_remove_desc, dead_remove },	/* remove */
+	{ &vop_link_desc, dead_link },	/* link */
+	{ &vop_rename_desc, dead_rename },	/* rename */
+	{ &vop_mkdir_desc, dead_mkdir },	/* mkdir */
+	{ &vop_rmdir_desc, dead_rmdir },	/* rmdir */
+	{ &vop_symlink_desc, dead_symlink },	/* symlink */
+	{ &vop_readdir_desc, dead_readdir },	/* readdir */
+	{ &vop_readlink_desc, dead_readlink },	/* readlink */
+	{ &vop_abortop_desc, dead_abortop },	/* abortop */
+	{ &vop_inactive_desc, dead_inactive },	/* inactive */
+	{ &vop_reclaim_desc, dead_reclaim },	/* reclaim */
+	{ &vop_lock_desc, dead_lock },	/* lock */
+	{ &vop_unlock_desc, dead_unlock },	/* unlock */
+	{ &vop_bmap_desc, dead_bmap },	/* bmap */
+	{ &vop_strategy_desc, dead_strategy },	/* strategy */
+	{ &vop_print_desc, dead_print },	/* print */
+	{ &vop_islocked_desc, dead_islocked },	/* islocked */
+	{ &vop_pathconf_desc, dead_pathconf },	/* pathconf */
+	{ &vop_advlock_desc, dead_advlock },	/* advlock */
+	{ &vop_blkatoff_desc, dead_blkatoff },	/* blkatoff */
+	{ &vop_valloc_desc, dead_valloc },	/* valloc */
+	{ &vop_vfree_desc, dead_vfree },	/* vfree */
+	{ &vop_truncate_desc, dead_truncate },	/* truncate */
+	{ &vop_update_desc, dead_update },	/* update */
+	{ &vop_bwrite_desc, dead_bwrite },	/* bwrite */
+	{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
+};
+struct vnodeopv_desc dead_vnodeop_opv_desc =
+	{ &dead_vnodeop_p, dead_vnodeop_entries };
+
+/*
+ * Trivial lookup routine that always fails.
+ */
+/* ARGSUSED */
+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 */
+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 */
+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 character devices, EIO for others
+	 */
+	if (ap->a_vp->v_type != VCHR)
+		return (EIO);
+	return (0);
+}
+
+/*
+ * Vnode op for write
+ */
+/* ARGSUSED */
+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 */
+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 (EBADF);
+	return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap));
+}
+
+/* ARGSUSED */
+dead_select(ap)
+	struct vop_select_args /* {
+		struct vnode *a_vp;
+		int  a_which;
+		int  a_fflags;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+
+	/*
+	 * Let the user find out that the descriptor is gone.
+	 */
+	return (1);
+}
+
+/*
+ * Just call the device strategy routine
+ */
+dead_strategy(ap)
+	struct vop_strategy_args /* {
+		struct buf *a_bp;
+	} */ *ap;
+{
+
+	if (ap->a_bp->b_vp == NULL || !chkvnlock(ap->a_bp->b_vp)) {
+		ap->a_bp->b_flags |= B_ERROR;
+		biodone(ap->a_bp);
+		return (EIO);
+	}
+	return (VOP_STRATEGY(ap->a_bp));
+}
+
+/*
+ * Wait until the vnode has finished changing state.
+ */
+dead_lock(ap)
+	struct vop_lock_args /* {
+		struct vnode *a_vp;
+	} */ *ap;
+{
+
+	if (!chkvnlock(ap->a_vp))
+		return (0);
+	return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap));
+}
+
+/*
+ * Wait until the vnode has finished changing state.
+ */
+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;
+	} */ *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));
+}
+
+/*
+ * Print out the contents of a dead vnode.
+ */
+/* ARGSUSED */
+dead_print(ap)
+	struct vop_print_args /* {
+		struct vnode *a_vp;
+	} */ *ap;
+{
+
+	printf("tag VT_NON, dead vnode\n");
+}
+
+/*
+ * Empty vnode failed operation
+ */
+dead_ebadf()
+{
+
+	return (EBADF);
+}
+
+/*
+ * Empty vnode bad operation
+ */
+dead_badop()
+{
+
+	panic("dead_badop called");
+	/* NOTREACHED */
+}
+
+/*
+ * Empty vnode null operation
+ */
+dead_nullop()
+{
+
+	return (0);
+}
+
+/*
+ * We have to wait during times when the vnode is
+ * in a state of change.
+ */
+chkvnlock(vp)
+	register struct vnode *vp;
+{
+	int locked = 0;
+
+	while (vp->v_flag & VXLOCK) {
+		vp->v_flag |= VXWANT;
+		sleep((caddr_t)vp, PINOD);
+		locked = 1;
+	}
+	return (locked);
+}