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
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/lock.h>
36 #include <sys/mutex.h>
37 #include <sys/poll.h>
38 #include <sys/vnode.h>
39
40 /*
41 * Prototypes for dead operations on vnodes.
42 */
43 static vop_lookup_t dead_lookup;
44 static vop_open_t dead_open;
45 static vop_close_t dead_close;
46 static vop_getwritemount_t dead_getwritemount;
47 static vop_rename_t dead_rename;
48 static vop_unset_text_t dead_unset_text;
49
50 struct vop_vector dead_vnodeops = {
51 .vop_default = &default_vnodeops,
52
53 .vop_access = VOP_EBADF,
54 .vop_advlock = VOP_EBADF,
55 .vop_bmap = VOP_EBADF,
56 .vop_close = dead_close,
57 .vop_create = VOP_PANIC,
58 .vop_delayed_setsize = VOP_NULL,
59 .vop_fplookup_symlink = VOP_EOPNOTSUPP,
60 .vop_fplookup_vexec = VOP_EOPNOTSUPP,
61 .vop_getattr = VOP_EBADF,
62 .vop_getwritemount = dead_getwritemount,
63 .vop_inactive = VOP_NULL,
64 .vop_ioctl = VOP_EBADF,
65 .vop_link = VOP_PANIC,
66 .vop_lookup = dead_lookup,
67 .vop_mkdir = VOP_PANIC,
68 .vop_mknod = VOP_PANIC,
69 .vop_open = dead_open,
70 .vop_pathconf = VOP_EBADF, /* per pathconf(2) */
71 .vop_poll = dead_poll,
72 .vop_read = dead_read,
73 .vop_readdir = VOP_EBADF,
74 .vop_readlink = VOP_EBADF,
75 .vop_reclaim = VOP_NULL,
76 .vop_remove = VOP_PANIC,
77 .vop_rename = dead_rename,
78 .vop_rmdir = VOP_PANIC,
79 .vop_setattr = VOP_EBADF,
80 .vop_symlink = VOP_PANIC,
81 .vop_vptocnp = VOP_EBADF,
82 .vop_unset_text = dead_unset_text,
83 .vop_write = dead_write,
84 };
85 VFS_VOP_VECTOR_REGISTER(dead_vnodeops);
86
87 static int
dead_getwritemount(struct vop_getwritemount_args * ap)88 dead_getwritemount(struct vop_getwritemount_args *ap)
89 {
90
91 *(ap->a_mpp) = NULL;
92 return (0);
93 }
94
95 /*
96 * Trivial lookup routine that always fails.
97 */
98 static int
dead_lookup(struct vop_lookup_args * ap)99 dead_lookup(struct vop_lookup_args *ap)
100 {
101
102 *ap->a_vpp = NULL;
103 return (ENOTDIR);
104 }
105
106 /*
107 * Silently succeed open and close.
108 */
109 static int
dead_open(struct vop_open_args * ap)110 dead_open(struct vop_open_args *ap)
111 {
112 return (0);
113 }
114
115 static int
dead_close(struct vop_close_args * ap)116 dead_close(struct vop_close_args *ap)
117 {
118 return (0);
119 }
120
121 int
dead_read(struct vop_read_args * ap)122 dead_read(struct vop_read_args *ap)
123 {
124
125 /*
126 * Return EOF for tty devices, ENXIO for others
127 */
128 if (ap->a_vp->v_vflag & VV_ISTTY)
129 return (0);
130 return (ENXIO);
131 }
132
133 int
dead_write(struct vop_write_args * ap)134 dead_write(struct vop_write_args *ap)
135 {
136
137 return (ENXIO);
138 }
139
140 int
dead_poll(struct vop_poll_args * ap)141 dead_poll(struct vop_poll_args *ap)
142 {
143
144 if (ap->a_events & ~POLLSTANDARD)
145 return (POLLNVAL);
146
147 /*
148 * Let the user find out that the descriptor is gone.
149 */
150 return (POLLHUP | ((POLLIN | POLLRDNORM) & ap->a_events));
151
152 }
153
154 static int
dead_rename(struct vop_rename_args * ap)155 dead_rename(struct vop_rename_args *ap)
156 {
157
158 vop_rename_fail(ap);
159 return (EXDEV);
160 }
161
162 static int
dead_unset_text(struct vop_unset_text_args * ap)163 dead_unset_text(struct vop_unset_text_args *ap)
164 {
165
166 return (0);
167 }
168