1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)dead_vnops.c 8.1 (Berkeley) 6/10/93
32 * $FreeBSD$
33 */
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/lock.h>
39 #include <sys/mutex.h>
40 #include <sys/poll.h>
41 #include <sys/vnode.h>
42
43 /*
44 * Prototypes for dead operations on vnodes.
45 */
46 static vop_lookup_t dead_lookup;
47 static vop_open_t dead_open;
48 static vop_getwritemount_t dead_getwritemount;
49 static vop_rename_t dead_rename;
50 static vop_unset_text_t dead_unset_text;
51
52 struct vop_vector dead_vnodeops = {
53 .vop_default = &default_vnodeops,
54
55 .vop_access = VOP_EBADF,
56 .vop_advlock = VOP_EBADF,
57 .vop_bmap = VOP_EBADF,
58 .vop_create = VOP_PANIC,
59 .vop_getattr = VOP_EBADF,
60 .vop_getwritemount = dead_getwritemount,
61 .vop_inactive = VOP_NULL,
62 .vop_ioctl = VOP_EBADF,
63 .vop_link = VOP_PANIC,
64 .vop_lookup = dead_lookup,
65 .vop_mkdir = VOP_PANIC,
66 .vop_mknod = VOP_PANIC,
67 .vop_open = dead_open,
68 .vop_pathconf = VOP_EBADF, /* per pathconf(2) */
69 .vop_poll = dead_poll,
70 .vop_read = dead_read,
71 .vop_readdir = VOP_EBADF,
72 .vop_readlink = VOP_EBADF,
73 .vop_reclaim = VOP_NULL,
74 .vop_remove = VOP_PANIC,
75 .vop_rename = dead_rename,
76 .vop_rmdir = VOP_PANIC,
77 .vop_setattr = VOP_EBADF,
78 .vop_symlink = VOP_PANIC,
79 .vop_vptocnp = VOP_EBADF,
80 .vop_unset_text = dead_unset_text,
81 .vop_write = dead_write,
82 };
83
84 static int
85 dead_getwritemount(struct vop_getwritemount_args *ap)
86 {
87
88 *(ap->a_mpp) = NULL;
89 return (0);
90 }
91
92 /*
93 * Trivial lookup routine that always fails.
94 */
95 static int
96 dead_lookup(struct vop_lookup_args *ap)
97 {
98
99 *ap->a_vpp = NULL;
100 return (ENOTDIR);
101 }
102
103 /*
104 * Open always fails as if device did not exist.
105 */
106 static int
107 dead_open(struct vop_open_args *ap)
108 {
109
110 return (ENXIO);
111 }
112
113 int
114 dead_read(struct vop_read_args *ap)
115 {
116
117 /*
118 * Return EOF for tty devices, EIO for others
119 */
120 if ((ap->a_vp->v_vflag & VV_ISTTY) == 0)
121 return (EIO);
122 return (0);
123 }
124
125 int
126 dead_write(struct vop_write_args *ap)
127 {
128
129 return (EIO);
130 }
131
132 int
133 dead_poll(struct vop_poll_args *ap)
134 {
135
136 if (ap->a_events & ~POLLSTANDARD)
137 return (POLLNVAL);
138
139 /*
140 * Let the user find out that the descriptor is gone.
141 */
142 return (POLLHUP | ((POLLIN | POLLRDNORM) & ap->a_events));
143
144 }
145
146 static int
147 dead_rename(struct vop_rename_args *ap)
148 {
149
150 vop_rename_fail(ap);
151 return (EXDEV);
152 }
153
154 static int
155 dead_unset_text(struct vop_unset_text_args *ap)
156 {
157
158 return (0);
159 }
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