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: releng/6.0/sys/fs/deadfs/dead_vnops.c 143506 2005-03-13 12:06:20Z jeff $
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_bmap_t dead_bmap;
45 static vop_ioctl_t dead_ioctl;
46 static vop_lookup_t dead_lookup;
47 static vop_open_t dead_open;
48 static vop_poll_t dead_poll;
49 static vop_read_t dead_read;
50 static vop_write_t dead_write;
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 = dead_bmap,
58 .vop_create = VOP_PANIC,
59 .vop_getattr = VOP_EBADF,
60 .vop_inactive = VOP_NULL,
61 .vop_ioctl = dead_ioctl,
62 .vop_link = VOP_PANIC,
63 .vop_lookup = dead_lookup,
64 .vop_mkdir = VOP_PANIC,
65 .vop_mknod = VOP_PANIC,
66 .vop_open = dead_open,
67 .vop_pathconf = VOP_EBADF, /* per pathconf(2) */
68 .vop_poll = dead_poll,
69 .vop_read = dead_read,
70 .vop_readdir = VOP_EBADF,
71 .vop_readlink = VOP_EBADF,
72 .vop_reclaim = VOP_NULL,
73 .vop_remove = VOP_PANIC,
74 .vop_rename = VOP_PANIC,
75 .vop_rmdir = VOP_PANIC,
76 .vop_setattr = VOP_EBADF,
77 .vop_symlink = VOP_PANIC,
78 .vop_write = dead_write,
79 };
80
81 /*
82 * Trivial lookup routine that always fails.
83 */
84 /* ARGSUSED */
85 static int
86 dead_lookup(ap)
87 struct vop_lookup_args /* {
88 struct vnode * a_dvp;
89 struct vnode ** a_vpp;
90 struct componentname * a_cnp;
91 } */ *ap;
92 {
93
94 *ap->a_vpp = NULL;
95 return (ENOTDIR);
96 }
97
98 /*
99 * Open always fails as if device did not exist.
100 */
101 /* ARGSUSED */
102 static int
103 dead_open(ap)
104 struct vop_open_args /* {
105 struct vnode *a_vp;
106 int a_mode;
107 struct ucred *a_cred;
108 struct proc *a_p;
109 } */ *ap;
110 {
111
112 return (ENXIO);
113 }
114
115 /*
116 * Vnode op for read
117 */
118 /* ARGSUSED */
119 static int
120 dead_read(ap)
121 struct vop_read_args /* {
122 struct vnode *a_vp;
123 struct uio *a_uio;
124 int a_ioflag;
125 struct ucred *a_cred;
126 } */ *ap;
127 {
128 /*
129 * Return EOF for tty devices, EIO for others
130 */
131 if ((ap->a_vp->v_vflag & VV_ISTTY) == 0)
132 return (EIO);
133 return (0);
134 }
135
136 /*
137 * Vnode op for write
138 */
139 /* ARGSUSED */
140 static int
141 dead_write(ap)
142 struct vop_write_args /* {
143 struct vnode *a_vp;
144 struct uio *a_uio;
145 int a_ioflag;
146 struct ucred *a_cred;
147 } */ *ap;
148 {
149 return (EIO);
150 }
151
152 /*
153 * Device ioctl operation.
154 */
155 /* ARGSUSED */
156 static int
157 dead_ioctl(ap)
158 struct vop_ioctl_args /* {
159 struct vnode *a_vp;
160 u_long a_command;
161 caddr_t a_data;
162 int a_fflag;
163 struct ucred *a_cred;
164 struct proc *a_p;
165 } */ *ap;
166 {
167 /* XXX: Doesn't this just recurse back here ? */
168 return (VOP_IOCTL_AP(ap));
169 }
170
171 /*
172 * Wait until the vnode has finished changing state.
173 */
174 static int
175 dead_bmap(ap)
176 struct vop_bmap_args /* {
177 struct vnode *a_vp;
178 daddr_t a_bn;
179 struct bufobj **a_bop;
180 daddr_t *a_bnp;
181 int *a_runp;
182 int *a_runb;
183 } */ *ap;
184 {
185
186 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_bop, ap->a_bnp, ap->a_runp, ap->a_runb));
187 }
188
189 /*
190 * Trivial poll routine that always returns POLLHUP.
191 * This is necessary so that a process which is polling a file
192 * gets notified when that file is revoke()d.
193 */
194 static int
195 dead_poll(ap)
196 struct vop_poll_args *ap;
197 {
198 return (POLLHUP);
199 }
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