dead_vfsops.c revision 1.8 
1/*	$NetBSD: dead_vfsops.c,v 1.8 2017/08/21 08:56:45 hannken Exp $	*/
2
3/*-
4 * Copyright (c) 2014 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Juergen Hannken-Illjes.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: dead_vfsops.c,v 1.8 2017/08/21 08:56:45 hannken Exp $");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/vnode.h>
38#include <sys/mount.h>
39
40#include <miscfs/specfs/specdev.h>
41
42VFS_PROTOS(dead);
43
44static void dead_panic(void);
45
46extern const struct vnodeopv_desc dead_vnodeop_opv_desc;
47
48static const struct vnodeopv_desc * const dead_vnodeopv_descs[] = {
49	&dead_vnodeop_opv_desc,
50	NULL
51};
52
53struct mount *dead_rootmount;
54
55struct vfsops dead_vfsops = {
56	.vfs_name = "dead",
57	.vfs_min_mount_data = 0,
58	.vfs_mount = (void *)dead_panic,
59	.vfs_start = (void *)dead_panic,
60	.vfs_unmount = (void *)dead_panic,
61	.vfs_root = (void *)dead_panic,
62	.vfs_quotactl = (void *)dead_panic,
63	.vfs_statvfs = (void *)dead_panic,
64	.vfs_sync = (void *)dead_panic,
65	.vfs_vget = (void *)dead_panic,
66	.vfs_loadvnode = (void *)dead_panic,
67	.vfs_newvnode = dead_newvnode,
68	.vfs_fhtovp = (void *)dead_panic,
69	.vfs_vptofh = (void *)dead_panic,
70	.vfs_init = (void *)dead_panic,
71	.vfs_reinit = (void *)dead_panic,
72	.vfs_done = (void *)dead_panic,
73	.vfs_mountroot = (void *)dead_panic,
74	.vfs_snapshot = (void *)dead_panic,
75	.vfs_extattrctl = (void *)dead_panic,
76	.vfs_suspendctl = (void *)dead_panic,
77	.vfs_renamelock_enter = (void *)dead_panic,
78	.vfs_renamelock_exit = (void *)dead_panic,
79	.vfs_fsync = (void *)eopnotsupp,
80	.vfs_opv_descs = dead_vnodeopv_descs
81};
82
83static void
84dead_panic(void)
85{
86
87	panic("dead fs operation used");
88}
89
90/*
91 * Create a new anonymous device vnode.
92 */
93int
94dead_newvnode(struct mount *mp, struct vnode *dvp, struct vnode *vp,
95    struct vattr *vap, kauth_cred_t cred,
96    size_t *key_len, const void **new_key)
97{
98
99	KASSERT(mp == dead_rootmount);
100	KASSERT(dvp == NULL);
101	KASSERT(vap->va_type == VCHR || vap->va_type == VBLK);
102	KASSERT(vap->va_rdev != VNOVAL);
103
104	vp->v_tag = VT_NON;
105	vp->v_type = vap->va_type;
106	vp->v_op = spec_vnodeop_p;
107	vp->v_vflag |= VV_MPSAFE;
108	uvm_vnp_setsize(vp, 0);
109	spec_node_init(vp, vap->va_rdev);
110
111	*key_len = 0;
112	*new_key = NULL;
113
114	return 0;
115}
116