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/9.0/sys/fs/deadfs/dead_vnops.c 206093 2010-04-02 14:03:01Z kib $
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 static vop_getwritemount_t dead_getwritemount;
52 static vop_rename_t dead_rename;
53
54 struct vop_vector dead_vnodeops = {
55 .vop_default = &default_vnodeops,
56
57 .vop_access = VOP_EBADF,
58 .vop_advlock = VOP_EBADF,
59 .vop_bmap = dead_bmap,
60 .vop_create = VOP_PANIC,
61 .vop_getattr = VOP_EBADF,
62 .vop_getwritemount = dead_getwritemount,
63 .vop_inactive = VOP_NULL,
64 .vop_ioctl = dead_ioctl,
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_write = dead_write,
83 };
84
85 /* ARGSUSED */
86 static int
87 dead_getwritemount(ap)
88 struct vop_getwritemount_args /* {
89 struct vnode *a_vp;
90 struct mount **a_mpp;
91 } */ *ap;
92 {
93 *(ap->a_mpp) = NULL;
94 return (0);
95 }
96
97 /*
98 * Trivial lookup routine that always fails.
99 */
100 /* ARGSUSED */
101 static int
102 dead_lookup(ap)
103 struct vop_lookup_args /* {
104 struct vnode * a_dvp;
105 struct vnode ** a_vpp;
106 struct componentname * a_cnp;
107 } */ *ap;
108 {
109
110 *ap->a_vpp = NULL;
111 return (ENOTDIR);
112 }
113
114 /*
115 * Open always fails as if device did not exist.
116 */
117 /* ARGSUSED */
118 static int
119 dead_open(ap)
120 struct vop_open_args /* {
121 struct vnode *a_vp;
122 int a_mode;
123 struct ucred *a_cred;
124 struct proc *a_p;
125 } */ *ap;
126 {
127
128 return (ENXIO);
129 }
130
131 /*
132 * Vnode op for read
133 */
134 /* ARGSUSED */
135 static int
136 dead_read(ap)
137 struct vop_read_args /* {
138 struct vnode *a_vp;
139 struct uio *a_uio;
140 int a_ioflag;
141 struct ucred *a_cred;
142 } */ *ap;
143 {
144 /*
145 * Return EOF for tty devices, EIO for others
146 */
147 if ((ap->a_vp->v_vflag & VV_ISTTY) == 0)
148 return (EIO);
149 return (0);
150 }
151
152 /*
153 * Vnode op for write
154 */
155 /* ARGSUSED */
156 static int
157 dead_write(ap)
158 struct vop_write_args /* {
159 struct vnode *a_vp;
160 struct uio *a_uio;
161 int a_ioflag;
162 struct ucred *a_cred;
163 } */ *ap;
164 {
165 return (EIO);
166 }
167
168 /*
169 * Device ioctl operation.
170 */
171 /* ARGSUSED */
172 static int
173 dead_ioctl(ap)
174 struct vop_ioctl_args /* {
175 struct vnode *a_vp;
176 u_long a_command;
177 caddr_t a_data;
178 int a_fflag;
179 struct ucred *a_cred;
180 struct proc *a_p;
181 } */ *ap;
182 {
183 /* XXX: Doesn't this just recurse back here ? */
184 return (VOP_IOCTL_AP(ap));
185 }
186
187 /*
188 * Wait until the vnode has finished changing state.
189 */
190 static int
191 dead_bmap(ap)
192 struct vop_bmap_args /* {
193 struct vnode *a_vp;
194 daddr_t a_bn;
195 struct bufobj **a_bop;
196 daddr_t *a_bnp;
197 int *a_runp;
198 int *a_runb;
199 } */ *ap;
200 {
201
202 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_bop, ap->a_bnp, ap->a_runp, ap->a_runb));
203 }
204
205 /*
206 * Trivial poll routine that always returns POLLHUP.
207 * This is necessary so that a process which is polling a file
208 * gets notified when that file is revoke()d.
209 */
210 static int
211 dead_poll(ap)
212 struct vop_poll_args *ap;
213 {
214 return (POLLHUP);
215 }
216
217 static int
218 dead_rename(ap)
219 struct vop_rename_args /* {
220 struct vnode *a_fdvp;
221 struct vnode *a_fvp;
222 struct componentname *a_fcnp;
223 struct vnode *a_tdvp;
224 struct vnode *a_tvp;
225 struct componentname *a_tcnp;
226 } */ *ap;
227 {
228
229 vop_rename_fail(ap);
230 return (EXDEV);
231 }
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