1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: releng/12.0/sys/geom/label/g_label.h 326270 2017-11-27 15:17:37Z pfg $
29 */
30
31 #ifndef _G_LABEL_H_
32 #define _G_LABEL_H_
33
34 #include <sys/endian.h>
35 #ifdef _KERNEL
36 #include <sys/sysctl.h>
37 #endif
38
39 #define G_LABEL_CLASS_NAME "LABEL"
40
41 #define G_LABEL_MAGIC "GEOM::LABEL"
42 /*
43 * Version history:
44 * 1 - Initial version number.
45 * 2 - Added md_provsize field to metadata.
46 */
47 #define G_LABEL_VERSION 2
48 #define G_LABEL_DIR "label"
49
50 #ifdef _KERNEL
51 extern u_int g_label_debug;
52
53 #define G_LABEL_DEBUG(lvl, ...) do { \
54 if (g_label_debug >= (lvl)) { \
55 printf("GEOM_LABEL"); \
56 if (g_label_debug > 0) \
57 printf("[%u]", lvl); \
58 printf(": "); \
59 printf(__VA_ARGS__); \
60 printf("\n"); \
61 } \
62 } while (0)
63
64 SYSCTL_DECL(_kern_geom_label);
65
66 #define G_LABEL_INIT(kind, label, descr) \
67 SYSCTL_NODE(_kern_geom_label, OID_AUTO, kind, CTLFLAG_RD, \
68 NULL, ""); \
69 SYSCTL_INT(_kern_geom_label_##kind, OID_AUTO, enable, \
70 CTLFLAG_RWTUN, &label.ld_enabled, 1, descr)
71
72 typedef void g_label_taste_t (struct g_consumer *cp, char *label, size_t size);
73
74 struct g_label_desc {
75 g_label_taste_t *ld_taste;
76 char *ld_dir;
77 int ld_enabled;
78 };
79
80 /* Supported labels. */
81 extern struct g_label_desc g_label_ufs_id;
82 extern struct g_label_desc g_label_ufs_volume;
83 extern struct g_label_desc g_label_iso9660;
84 extern struct g_label_desc g_label_msdosfs;
85 extern struct g_label_desc g_label_ext2fs;
86 extern struct g_label_desc g_label_reiserfs;
87 extern struct g_label_desc g_label_ntfs;
88 extern struct g_label_desc g_label_gpt;
89 extern struct g_label_desc g_label_gpt_uuid;
90 extern struct g_label_desc g_label_disk_ident;
91
92 extern void g_label_rtrim(char *label, size_t size);
93 #endif /* _KERNEL */
94
95 struct g_label_metadata {
96 char md_magic[16]; /* Magic value. */
97 uint32_t md_version; /* Version number. */
98 char md_label[16]; /* Label. */
99 uint64_t md_provsize; /* Provider's size. */
100 };
101 static __inline void
102 label_metadata_encode(const struct g_label_metadata *md, u_char *data)
103 {
104
105 bcopy(md->md_magic, data, sizeof(md->md_magic));
106 le32enc(data + 16, md->md_version);
107 bcopy(md->md_label, data + 20, sizeof(md->md_label));
108 le64enc(data + 36, md->md_provsize);
109 }
110 static __inline void
111 label_metadata_decode(const u_char *data, struct g_label_metadata *md)
112 {
113
114 bcopy(data, md->md_magic, sizeof(md->md_magic));
115 md->md_version = le32dec(data + 16);
116 bcopy(data + 20, md->md_label, sizeof(md->md_label));
117 md->md_provsize = le64dec(data + 36);
118 }
119 #endif /* _G_LABEL_H_ */
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