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