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
| 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: head/sys/fs/deadfs/dead_vnops.c 139776 2005-01-06 18:10:42Z imp $
| 30 * $FreeBSD: head/sys/fs/deadfs/dead_vnops.c 140165 2005-01-13 07:53:01Z phk $
|
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
41static int chkvnlock(struct vnode *);
42/*
43 * Prototypes for dead operations on vnodes.
44 */
45static vop_bmap_t dead_bmap;
46static vop_ioctl_t dead_ioctl;
47static vop_lock_t dead_lock;
48static vop_lookup_t dead_lookup;
49static vop_open_t dead_open;
50static vop_poll_t dead_poll;
51static vop_read_t dead_read;
52static vop_write_t dead_write;
53
54struct vop_vector dead_vnodeops = {
55 .vop_default = &default_vnodeops,
56 .vop_access = VOP_EBADF,
57 .vop_advlock = VOP_EBADF,
58 .vop_bmap = dead_bmap,
59 .vop_create = VOP_PANIC,
60 .vop_getattr = VOP_EBADF,
61 .vop_inactive = VOP_NULL,
62 .vop_ioctl = dead_ioctl,
63 .vop_link = VOP_PANIC,
64 .vop_lock = dead_lock,
65 .vop_lookup = dead_lookup,
66 .vop_mkdir = VOP_PANIC,
67 .vop_mknod = VOP_PANIC,
68 .vop_open = dead_open,
69 .vop_pathconf = VOP_EBADF, /* per pathconf(2) */
70 .vop_poll = dead_poll,
71 .vop_read = dead_read,
72 .vop_readdir = VOP_EBADF,
73 .vop_readlink = VOP_EBADF,
74 .vop_reclaim = VOP_NULL,
75 .vop_remove = VOP_PANIC,
76 .vop_rename = VOP_PANIC,
77 .vop_rmdir = VOP_PANIC,
78 .vop_setattr = VOP_EBADF,
79 .vop_symlink = VOP_PANIC,
80 .vop_write = dead_write,
81};
82
83/*
84 * Trivial lookup routine that always fails.
85 */
86/* ARGSUSED */
87static int
88dead_lookup(ap)
89 struct vop_lookup_args /* {
90 struct vnode * a_dvp;
91 struct vnode ** a_vpp;
92 struct componentname * a_cnp;
93 } */ *ap;
94{
95
96 *ap->a_vpp = NULL;
97 return (ENOTDIR);
98}
99
100/*
101 * Open always fails as if device did not exist.
102 */
103/* ARGSUSED */
104static int
105dead_open(ap)
106 struct vop_open_args /* {
107 struct vnode *a_vp;
108 int a_mode;
109 struct ucred *a_cred;
110 struct proc *a_p;
111 } */ *ap;
112{
113
114 return (ENXIO);
115}
116
117/*
118 * Vnode op for read
119 */
120/* ARGSUSED */
121static int
122dead_read(ap)
123 struct vop_read_args /* {
124 struct vnode *a_vp;
125 struct uio *a_uio;
126 int a_ioflag;
127 struct ucred *a_cred;
128 } */ *ap;
129{
130
131 if (chkvnlock(ap->a_vp))
132 panic("dead_read: lock");
133 /*
134 * Return EOF for tty devices, EIO for others
135 */
136 if ((ap->a_vp->v_vflag & VV_ISTTY) == 0)
137 return (EIO);
138 return (0);
139}
140
141/*
142 * Vnode op for write
143 */
144/* ARGSUSED */
145static int
146dead_write(ap)
147 struct vop_write_args /* {
148 struct vnode *a_vp;
149 struct uio *a_uio;
150 int a_ioflag;
151 struct ucred *a_cred;
152 } */ *ap;
153{
154
155 if (chkvnlock(ap->a_vp))
156 panic("dead_write: lock");
157 return (EIO);
158}
159
160/*
161 * Device ioctl operation.
162 */
163/* ARGSUSED */
164static int
165dead_ioctl(ap)
166 struct vop_ioctl_args /* {
167 struct vnode *a_vp;
168 u_long a_command;
169 caddr_t a_data;
170 int a_fflag;
171 struct ucred *a_cred;
172 struct proc *a_p;
173 } */ *ap;
174{
175
176 if (!chkvnlock(ap->a_vp))
177 return (ENOTTY);
178 /* XXX: Doesn't this just recurse back here ? */
| 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
41static int chkvnlock(struct vnode *);
42/*
43 * Prototypes for dead operations on vnodes.
44 */
45static vop_bmap_t dead_bmap;
46static vop_ioctl_t dead_ioctl;
47static vop_lock_t dead_lock;
48static vop_lookup_t dead_lookup;
49static vop_open_t dead_open;
50static vop_poll_t dead_poll;
51static vop_read_t dead_read;
52static vop_write_t dead_write;
53
54struct vop_vector dead_vnodeops = {
55 .vop_default = &default_vnodeops,
56 .vop_access = VOP_EBADF,
57 .vop_advlock = VOP_EBADF,
58 .vop_bmap = dead_bmap,
59 .vop_create = VOP_PANIC,
60 .vop_getattr = VOP_EBADF,
61 .vop_inactive = VOP_NULL,
62 .vop_ioctl = dead_ioctl,
63 .vop_link = VOP_PANIC,
64 .vop_lock = dead_lock,
65 .vop_lookup = dead_lookup,
66 .vop_mkdir = VOP_PANIC,
67 .vop_mknod = VOP_PANIC,
68 .vop_open = dead_open,
69 .vop_pathconf = VOP_EBADF, /* per pathconf(2) */
70 .vop_poll = dead_poll,
71 .vop_read = dead_read,
72 .vop_readdir = VOP_EBADF,
73 .vop_readlink = VOP_EBADF,
74 .vop_reclaim = VOP_NULL,
75 .vop_remove = VOP_PANIC,
76 .vop_rename = VOP_PANIC,
77 .vop_rmdir = VOP_PANIC,
78 .vop_setattr = VOP_EBADF,
79 .vop_symlink = VOP_PANIC,
80 .vop_write = dead_write,
81};
82
83/*
84 * Trivial lookup routine that always fails.
85 */
86/* ARGSUSED */
87static int
88dead_lookup(ap)
89 struct vop_lookup_args /* {
90 struct vnode * a_dvp;
91 struct vnode ** a_vpp;
92 struct componentname * a_cnp;
93 } */ *ap;
94{
95
96 *ap->a_vpp = NULL;
97 return (ENOTDIR);
98}
99
100/*
101 * Open always fails as if device did not exist.
102 */
103/* ARGSUSED */
104static int
105dead_open(ap)
106 struct vop_open_args /* {
107 struct vnode *a_vp;
108 int a_mode;
109 struct ucred *a_cred;
110 struct proc *a_p;
111 } */ *ap;
112{
113
114 return (ENXIO);
115}
116
117/*
118 * Vnode op for read
119 */
120/* ARGSUSED */
121static int
122dead_read(ap)
123 struct vop_read_args /* {
124 struct vnode *a_vp;
125 struct uio *a_uio;
126 int a_ioflag;
127 struct ucred *a_cred;
128 } */ *ap;
129{
130
131 if (chkvnlock(ap->a_vp))
132 panic("dead_read: lock");
133 /*
134 * Return EOF for tty devices, EIO for others
135 */
136 if ((ap->a_vp->v_vflag & VV_ISTTY) == 0)
137 return (EIO);
138 return (0);
139}
140
141/*
142 * Vnode op for write
143 */
144/* ARGSUSED */
145static int
146dead_write(ap)
147 struct vop_write_args /* {
148 struct vnode *a_vp;
149 struct uio *a_uio;
150 int a_ioflag;
151 struct ucred *a_cred;
152 } */ *ap;
153{
154
155 if (chkvnlock(ap->a_vp))
156 panic("dead_write: lock");
157 return (EIO);
158}
159
160/*
161 * Device ioctl operation.
162 */
163/* ARGSUSED */
164static int
165dead_ioctl(ap)
166 struct vop_ioctl_args /* {
167 struct vnode *a_vp;
168 u_long a_command;
169 caddr_t a_data;
170 int a_fflag;
171 struct ucred *a_cred;
172 struct proc *a_p;
173 } */ *ap;
174{
175
176 if (!chkvnlock(ap->a_vp))
177 return (ENOTTY);
178 /* XXX: Doesn't this just recurse back here ? */
|
179 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap));
| 179 return (VOP_IOCTL_AP(ap));
|
180}
181
182
183/*
184 * Wait until the vnode has finished changing state.
185 */
186static int
187dead_lock(ap)
188 struct vop_lock_args /* {
189 struct vnode *a_vp;
190 int a_flags;
191 struct proc *a_p;
192 } */ *ap;
193{
194 struct vnode *vp = ap->a_vp;
195
196 /*
197 * Since we are not using the lock manager, we must clear
198 * the interlock here.
199 */
200 if (ap->a_flags & LK_INTERLOCK) {
201 mtx_unlock(&vp->v_interlock);
202 ap->a_flags &= ~LK_INTERLOCK;
203 }
204 if (!chkvnlock(vp))
205 return (0);
| 180}
181
182
183/*
184 * Wait until the vnode has finished changing state.
185 */
186static int
187dead_lock(ap)
188 struct vop_lock_args /* {
189 struct vnode *a_vp;
190 int a_flags;
191 struct proc *a_p;
192 } */ *ap;
193{
194 struct vnode *vp = ap->a_vp;
195
196 /*
197 * Since we are not using the lock manager, we must clear
198 * the interlock here.
199 */
200 if (ap->a_flags & LK_INTERLOCK) {
201 mtx_unlock(&vp->v_interlock);
202 ap->a_flags &= ~LK_INTERLOCK;
203 }
204 if (!chkvnlock(vp))
205 return (0);
|
206 return (VCALL(vp, VOFFSET(vop_lock), ap));
| 206 return (VOP_LOCK_AP(ap));
|
207}
208
209/*
210 * Wait until the vnode has finished changing state.
211 */
212static int
213dead_bmap(ap)
214 struct vop_bmap_args /* {
215 struct vnode *a_vp;
216 daddr_t a_bn;
217 struct bufobj **a_bop;
218 daddr_t *a_bnp;
219 int *a_runp;
220 int *a_runb;
221 } */ *ap;
222{
223
224 if (!chkvnlock(ap->a_vp))
225 return (EIO);
226 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_bop, ap->a_bnp, ap->a_runp, ap->a_runb));
227}
228
229/*
230 * We have to wait during times when the vnode is
231 * in a state of change.
232 */
233static int
234chkvnlock(vp)
235 register struct vnode *vp;
236{
237 int locked = 0;
238
239 VI_LOCK(vp);
240 while (vp->v_iflag & VI_XLOCK) {
241 vp->v_iflag |= VI_XWANT;
242 (void) msleep((caddr_t)vp, VI_MTX(vp), PINOD, "ckvnlk", 0);
243 locked = 1;
244 }
245 VI_UNLOCK(vp);
246 return (locked);
247}
248
249/*
250 * Trivial poll routine that always returns POLLHUP.
251 * This is necessary so that a process which is polling a file
252 * gets notified when that file is revoke()d.
253 */
254static int
255dead_poll(ap)
256 struct vop_poll_args *ap;
257{
258 return (POLLHUP);
259}
| 207}
208
209/*
210 * Wait until the vnode has finished changing state.
211 */
212static int
213dead_bmap(ap)
214 struct vop_bmap_args /* {
215 struct vnode *a_vp;
216 daddr_t a_bn;
217 struct bufobj **a_bop;
218 daddr_t *a_bnp;
219 int *a_runp;
220 int *a_runb;
221 } */ *ap;
222{
223
224 if (!chkvnlock(ap->a_vp))
225 return (EIO);
226 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_bop, ap->a_bnp, ap->a_runp, ap->a_runb));
227}
228
229/*
230 * We have to wait during times when the vnode is
231 * in a state of change.
232 */
233static int
234chkvnlock(vp)
235 register struct vnode *vp;
236{
237 int locked = 0;
238
239 VI_LOCK(vp);
240 while (vp->v_iflag & VI_XLOCK) {
241 vp->v_iflag |= VI_XWANT;
242 (void) msleep((caddr_t)vp, VI_MTX(vp), PINOD, "ckvnlk", 0);
243 locked = 1;
244 }
245 VI_UNLOCK(vp);
246 return (locked);
247}
248
249/*
250 * Trivial poll routine that always returns POLLHUP.
251 * This is necessary so that a process which is polling a file
252 * gets notified when that file is revoke()d.
253 */
254static int
255dead_poll(ap)
256 struct vop_poll_args *ap;
257{
258 return (POLLHUP);
259}
|