1/*	$NetBSD: dead_vfsops.c,v 1.13 2022/10/26 23:39:43 riastradh 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 1.13 2022/10/26 23:39:43 riastradh 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/deadfs/deadfs.h>
41#include <miscfs/specfs/specdev.h>
42
43VFS_PROTOS(dead);
44
45static void dead_panic(void);
46
47static const struct vnodeopv_desc * const dead_vnodeopv_descs[] = {
48	&dead_vnodeop_opv_desc,
49	NULL
50};
51
52struct mount *dead_rootmount;
53
54struct vfsops dead_vfsops = {
55	.vfs_name = "dead",
56	.vfs_min_mount_data = 0,
57	.vfs_mount = (void *)dead_panic,
58	.vfs_start = (void *)dead_panic,
59	.vfs_unmount = (void *)dead_panic,
60	.vfs_root = (void *)dead_panic,
61	.vfs_quotactl = (void *)dead_panic,
62	.vfs_statvfs = (void *)eopnotsupp,
63	.vfs_sync = (void *)dead_panic,
64	.vfs_vget = (void *)dead_panic,
65	.vfs_loadvnode = (void *)dead_panic,
66	.vfs_newvnode = dead_newvnode,
67	.vfs_fhtovp = (void *)dead_panic,
68	.vfs_vptofh = (void *)eopnotsupp,
69	.vfs_init = (void *)dead_panic,
70	.vfs_reinit = (void *)dead_panic,
71	.vfs_done = (void *)dead_panic,
72	.vfs_mountroot = (void *)dead_panic,
73	.vfs_snapshot = (void *)dead_panic,
74	.vfs_extattrctl = (void *)dead_panic,
75	.vfs_suspendctl = (void *)dead_panic,
76	.vfs_renamelock_enter = (void *)dead_panic,
77	.vfs_renamelock_exit = (void *)dead_panic,
78	.vfs_fsync = (void *)eopnotsupp,
79	.vfs_opv_descs = dead_vnodeopv_descs
80};
81
82static void
83dead_panic(void)
84{
85
86	panic("dead fs operation used");
87}
88
89/*
90 * Create a new anonymous device vnode.
91 */
92int
93dead_newvnode(struct mount *mp, struct vnode *dvp, struct vnode *vp,
94    struct vattr *vap, kauth_cred_t cred, void *extra,
95    size_t *key_len, const void **new_key)
96{
97
98	KASSERT(mp == dead_rootmount);
99	KASSERT(dvp == NULL);
100	KASSERT(vap->va_type == VCHR || vap->va_type == VBLK);
101	KASSERT(vap->va_rdev != VNOVAL);
102
103	vp->v_tag = VT_NON;
104	vp->v_type = vap->va_type;
105	vp->v_op = spec_vnodeop_p;
106	vp->v_vflag |= VV_MPSAFE;
107	uvm_vnp_setsize(vp, 0);
108	spec_node_init(vp, vap->va_rdev);
109
110	*key_len = 0;
111	*new_key = NULL;
112
113	return 0;
114}
115