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
43 VFS_PROTOS(dead);
44
45 static void dead_panic(void);
46
47 static const struct vnodeopv_desc * const dead_vnodeopv_descs[] = {
48 &dead_vnodeop_opv_desc,
49 NULL
50 };
51
52 struct mount *dead_rootmount;
53
54 struct 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
82 static void
dead_panic(void)83 dead_panic(void)
84 {
85
86 panic("dead fs operation used");
87 }
88
89 /*
90 * Create a new anonymous device vnode.
91 */
92 int
dead_newvnode(struct mount * mp,struct vnode * dvp,struct vnode * vp,struct vattr * vap,kauth_cred_t cred,void * extra,size_t * key_len,const void ** new_key)93 dead_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