MP Implementation 1/2: Get the APIC code working again, sweetly integrate the
[dragonfly.git] / sys / vfs / deadfs / dead_vnops.c
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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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)dead_vnops.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/miscfs/deadfs/dead_vnops.c,v 1.26 1999/08/28 00:46:42 peter Exp $
8a8d5d85 35 * $DragonFly: src/sys/vfs/deadfs/dead_vnops.c,v 1.3 2003/07/06 21:23:51 dillon Exp $
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36 */
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/kernel.h>
41#include <sys/lock.h>
42#include <sys/vnode.h>
43#include <sys/buf.h>
44#include <sys/poll.h>
45
46static int chkvnlock __P((struct vnode *));
47/*
48 * Prototypes for dead operations on vnodes.
49 */
50static int dead_badop __P((void));
51static int dead_bmap __P((struct vop_bmap_args *));
52static int dead_ioctl __P((struct vop_ioctl_args *));
53static int dead_lock __P((struct vop_lock_args *));
54static int dead_lookup __P((struct vop_lookup_args *));
55static int dead_open __P((struct vop_open_args *));
56static int dead_poll __P((struct vop_poll_args *));
57static int dead_print __P((struct vop_print_args *));
58static int dead_read __P((struct vop_read_args *));
59static int dead_write __P((struct vop_write_args *));
60
61vop_t **dead_vnodeop_p;
62static struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
63 { &vop_default_desc, (vop_t *) vop_defaultop },
64 { &vop_access_desc, (vop_t *) vop_ebadf },
65 { &vop_advlock_desc, (vop_t *) vop_ebadf },
66 { &vop_bmap_desc, (vop_t *) dead_bmap },
67 { &vop_create_desc, (vop_t *) dead_badop },
68 { &vop_getattr_desc, (vop_t *) vop_ebadf },
69 { &vop_inactive_desc, (vop_t *) vop_null },
70 { &vop_ioctl_desc, (vop_t *) dead_ioctl },
71 { &vop_link_desc, (vop_t *) dead_badop },
72 { &vop_lock_desc, (vop_t *) dead_lock },
73 { &vop_lookup_desc, (vop_t *) dead_lookup },
74 { &vop_mkdir_desc, (vop_t *) dead_badop },
75 { &vop_mknod_desc, (vop_t *) dead_badop },
76 { &vop_mmap_desc, (vop_t *) dead_badop },
77 { &vop_open_desc, (vop_t *) dead_open },
78 { &vop_pathconf_desc, (vop_t *) vop_ebadf }, /* per pathconf(2) */
79 { &vop_poll_desc, (vop_t *) dead_poll },
80 { &vop_print_desc, (vop_t *) dead_print },
81 { &vop_read_desc, (vop_t *) dead_read },
82 { &vop_readdir_desc, (vop_t *) vop_ebadf },
83 { &vop_readlink_desc, (vop_t *) vop_ebadf },
84 { &vop_reclaim_desc, (vop_t *) vop_null },
85 { &vop_remove_desc, (vop_t *) dead_badop },
86 { &vop_rename_desc, (vop_t *) dead_badop },
87 { &vop_rmdir_desc, (vop_t *) dead_badop },
88 { &vop_setattr_desc, (vop_t *) vop_ebadf },
89 { &vop_symlink_desc, (vop_t *) dead_badop },
90 { &vop_write_desc, (vop_t *) dead_write },
91 { NULL, NULL }
92};
93static struct vnodeopv_desc dead_vnodeop_opv_desc =
94 { &dead_vnodeop_p, dead_vnodeop_entries };
95
96VNODEOP_SET(dead_vnodeop_opv_desc);
97
98/*
99 * Trivial lookup routine that always fails.
100 */
101/* ARGSUSED */
102static int
103dead_lookup(ap)
104 struct vop_lookup_args /* {
105 struct vnode * a_dvp;
106 struct vnode ** a_vpp;
107 struct componentname * a_cnp;
108 } */ *ap;
109{
110
111 *ap->a_vpp = NULL;
112 return (ENOTDIR);
113}
114
115/*
116 * Open always fails as if device did not exist.
117 */
118/* ARGSUSED */
119static int
120dead_open(ap)
121 struct vop_open_args /* {
122 struct vnode *a_vp;
123 int a_mode;
124 struct ucred *a_cred;
125 struct proc *a_p;
126 } */ *ap;
127{
128
129 return (ENXIO);
130}
131
132/*
133 * Vnode op for read
134 */
135/* ARGSUSED */
136static int
137dead_read(ap)
138 struct vop_read_args /* {
139 struct vnode *a_vp;
140 struct uio *a_uio;
141 int a_ioflag;
142 struct ucred *a_cred;
143 } */ *ap;
144{
145
146 if (chkvnlock(ap->a_vp))
147 panic("dead_read: lock");
148 /*
149 * Return EOF for tty devices, EIO for others
150 */
151 if ((ap->a_vp->v_flag & VISTTY) == 0)
152 return (EIO);
153 return (0);
154}
155
156/*
157 * Vnode op for write
158 */
159/* ARGSUSED */
160static int
161dead_write(ap)
162 struct vop_write_args /* {
163 struct vnode *a_vp;
164 struct uio *a_uio;
165 int a_ioflag;
166 struct ucred *a_cred;
167 } */ *ap;
168{
169
170 if (chkvnlock(ap->a_vp))
171 panic("dead_write: lock");
172 return (EIO);
173}
174
175/*
176 * Device ioctl operation.
177 */
178/* ARGSUSED */
179static int
180dead_ioctl(ap)
181 struct vop_ioctl_args /* {
182 struct vnode *a_vp;
183 int a_command;
184 caddr_t a_data;
185 int a_fflag;
186 struct ucred *a_cred;
187 struct proc *a_p;
188 } */ *ap;
189{
190
191 if (!chkvnlock(ap->a_vp))
192 return (ENOTTY);
193 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap));
194}
195
196
197/*
198 * Wait until the vnode has finished changing state.
199 */
200static int
201dead_lock(ap)
202 struct vop_lock_args /* {
203 struct vnode *a_vp;
204 int a_flags;
205 struct proc *a_p;
206 } */ *ap;
207{
208 struct vnode *vp = ap->a_vp;
209
210 /*
211 * Since we are not using the lock manager, we must clear
212 * the interlock here.
213 */
214 if (ap->a_flags & LK_INTERLOCK) {
8a8d5d85 215 lwkt_reltoken(&vp->v_interlock);
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216 ap->a_flags &= ~LK_INTERLOCK;
217 }
218 if (!chkvnlock(vp))
219 return (0);
220 return (VCALL(vp, VOFFSET(vop_lock), ap));
221}
222
223/*
224 * Wait until the vnode has finished changing state.
225 */
226static int
227dead_bmap(ap)
228 struct vop_bmap_args /* {
229 struct vnode *a_vp;
230 daddr_t a_bn;
231 struct vnode **a_vpp;
232 daddr_t *a_bnp;
233 int *a_runp;
234 int *a_runb;
235 } */ *ap;
236{
237
238 if (!chkvnlock(ap->a_vp))
239 return (EIO);
240 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp, ap->a_runb));
241}
242
243/*
244 * Print out the contents of a dead vnode.
245 */
246/* ARGSUSED */
247static int
248dead_print(ap)
249 struct vop_print_args /* {
250 struct vnode *a_vp;
251 } */ *ap;
252{
253
254 printf("tag VT_NON, dead vnode\n");
255 return (0);
256}
257
258/*
259 * Empty vnode bad operation
260 */
261static int
262dead_badop()
263{
264
265 panic("dead_badop called");
266 /* NOTREACHED */
267}
268
269/*
270 * We have to wait during times when the vnode is
271 * in a state of change.
272 */
273int
274chkvnlock(vp)
275 register struct vnode *vp;
276{
277 int locked = 0;
278
279 while (vp->v_flag & VXLOCK) {
280 vp->v_flag |= VXWANT;
281 (void) tsleep((caddr_t)vp, PINOD, "ckvnlk", 0);
282 locked = 1;
283 }
284 return (locked);
285}
286
287/*
288 * Trivial poll routine that always returns POLLHUP.
289 * This is necessary so that a process which is polling a file
290 * gets notified when that file is revoke()d.
291 */
292static int
293dead_poll(ap)
294 struct vop_poll_args *ap;
295{
296 return (POLLHUP);
297}