1 /* $NetBSD: tmpfs_specops.c,v 1.16 2021/07/19 01:30:25 dholland Exp $ */
2
3 /*
4 * Copyright (c) 2005 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
9 * 2005 program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /*
34 * tmpfs vnode interface for special devices.
35 */
36
37 #include <sys/cdefs.h>
38 __KERNEL_RCSID(0, "$NetBSD: tmpfs_specops.c,v 1.16 2021/07/19 01:30:25 dholland Exp $");
39
40 #include <sys/param.h>
41 #include <sys/vnode.h>
42
43 #include <fs/tmpfs/tmpfs.h>
44 #include <fs/tmpfs/tmpfs_specops.h>
45
46 /*
47 * vnode operations vector used for special devices stored in a tmpfs
48 * file system.
49 */
50
51 int (**tmpfs_specop_p)(void *);
52
53 const struct vnodeopv_entry_desc tmpfs_specop_entries[] = {
54 { &vop_default_desc, vn_default_error },
55 GENFS_SPECOP_ENTRIES,
56 { &vop_close_desc, tmpfs_spec_close },
57 { &vop_access_desc, tmpfs_access },
58 { &vop_accessx_desc, genfs_accessx },
59 { &vop_getattr_desc, tmpfs_getattr },
60 { &vop_setattr_desc, tmpfs_setattr },
61 { &vop_read_desc, tmpfs_spec_read },
62 { &vop_write_desc, tmpfs_spec_write },
63 { &vop_fcntl_desc, genfs_fcntl },
64 { &vop_fsync_desc, spec_fsync },
65 { &vop_inactive_desc, tmpfs_inactive },
66 { &vop_reclaim_desc, tmpfs_reclaim },
67 { &vop_lock_desc, genfs_lock },
68 { &vop_unlock_desc, genfs_unlock },
69 { &vop_print_desc, tmpfs_print },
70 { &vop_islocked_desc, genfs_islocked },
71 { &vop_bwrite_desc, vn_bwrite },
72 { NULL, NULL }
73 };
74
75 const struct vnodeopv_desc tmpfs_specop_opv_desc = {
76 &tmpfs_specop_p, tmpfs_specop_entries
77 };
78
79 int
tmpfs_spec_close(void * v)80 tmpfs_spec_close(void *v)
81 {
82 struct vop_close_args /* {
83 struct vnode *a_vp;
84 int a_fflag;
85 kauth_cred_t a_cred;
86 } */ *ap __unused = v;
87
88 return VOCALL(spec_vnodeop_p, VOFFSET(vop_close), v);
89 }
90
91 int
tmpfs_spec_read(void * v)92 tmpfs_spec_read(void *v)
93 {
94 struct vop_read_args /* {
95 struct vnode *a_vp;
96 struct uio *a_uio;
97 int a_ioflag;
98 kauth_cred_t a_cred;
99 } */ *ap = v;
100 vnode_t *vp = ap->a_vp;
101
102 tmpfs_update(vp, TMPFS_UPDATE_ATIME);
103 return VOCALL(spec_vnodeop_p, VOFFSET(vop_read), v);
104 }
105
106 int
tmpfs_spec_write(void * v)107 tmpfs_spec_write(void *v)
108 {
109 struct vop_write_args /* {
110 struct vnode *a_vp;
111 struct uio *a_uio;
112 int a_ioflag;
113 kauth_cred_t a_cred;
114 } */ *ap = v;
115 vnode_t *vp = ap->a_vp;
116
117 tmpfs_update(vp, TMPFS_UPDATE_MTIME);
118 return VOCALL(spec_vnodeop_p, VOFFSET(vop_write), v);
119 }
120