1 /*-
2 * Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/11.2/sys/geom/label/g_label.h 284582 2015-06-18 21:55:55Z trasz $
27 */
28
29 #ifndef _G_LABEL_H_
30 #define _G_LABEL_H_
31
32 #include <sys/endian.h>
33 #ifdef _KERNEL
34 #include <sys/sysctl.h>
35 #endif
36
37 #define G_LABEL_CLASS_NAME "LABEL"
38
39 #define G_LABEL_MAGIC "GEOM::LABEL"
40 /*
41 * Version history:
42 * 1 - Initial version number.
43 * 2 - Added md_provsize field to metadata.
44 */
45 #define G_LABEL_VERSION 2
46 #define G_LABEL_DIR "label"
47
48 #ifdef _KERNEL
49 extern u_int g_label_debug;
50
51 #define G_LABEL_DEBUG(lvl, ...) do { \
52 if (g_label_debug >= (lvl)) { \
53 printf("GEOM_LABEL"); \
54 if (g_label_debug > 0) \
55 printf("[%u]", lvl); \
56 printf(": "); \
57 printf(__VA_ARGS__); \
58 printf("\n"); \
59 } \
60 } while (0)
61
62 SYSCTL_DECL(_kern_geom_label);
63
64 #define G_LABEL_INIT(kind, label, descr) \
65 SYSCTL_NODE(_kern_geom_label, OID_AUTO, kind, CTLFLAG_RD, \
66 NULL, ""); \
67 SYSCTL_INT(_kern_geom_label_##kind, OID_AUTO, enable, \
68 CTLFLAG_RWTUN, &label.ld_enabled, 1, descr)
69
70 typedef void g_label_taste_t (struct g_consumer *cp, char *label, size_t size);
71
72 struct g_label_desc {
73 g_label_taste_t *ld_taste;
74 char *ld_dir;
75 int ld_enabled;
76 };
77
78 /* Supported labels. */
79 extern struct g_label_desc g_label_ufs_id;
80 extern struct g_label_desc g_label_ufs_volume;
81 extern struct g_label_desc g_label_iso9660;
82 extern struct g_label_desc g_label_msdosfs;
83 extern struct g_label_desc g_label_ext2fs;
84 extern struct g_label_desc g_label_reiserfs;
85 extern struct g_label_desc g_label_ntfs;
86 extern struct g_label_desc g_label_gpt;
87 extern struct g_label_desc g_label_gpt_uuid;
88 extern struct g_label_desc g_label_disk_ident;
89
90 extern void g_label_rtrim(char *label, size_t size);
91 #endif /* _KERNEL */
92
93 struct g_label_metadata {
94 char md_magic[16]; /* Magic value. */
95 uint32_t md_version; /* Version number. */
96 char md_label[16]; /* Label. */
97 uint64_t md_provsize; /* Provider's size. */
98 };
99 static __inline void
100 label_metadata_encode(const struct g_label_metadata *md, u_char *data)
101 {
102
103 bcopy(md->md_magic, data, sizeof(md->md_magic));
104 le32enc(data + 16, md->md_version);
105 bcopy(md->md_label, data + 20, sizeof(md->md_label));
106 le64enc(data + 36, md->md_provsize);
107 }
108 static __inline void
109 label_metadata_decode(const u_char *data, struct g_label_metadata *md)
110 {
111
112 bcopy(data, md->md_magic, sizeof(md->md_magic));
113 md->md_version = le32dec(data + 16);
114 bcopy(data + 20, md->md_label, sizeof(md->md_label));
115 md->md_provsize = le64dec(data + 36);
116 }
117 #endif /* _G_LABEL_H_ */
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