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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  * $FreeBSD$
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_RW, &label.ld_enabled, 1, descr);                   \
69         TUNABLE_INT("kern.geom.label." __XSTRING(kind) ".enable",       \
70             &label.ld_enabled)
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 #endif  /* _KERNEL */
91
92 struct g_label_metadata {
93         char            md_magic[16];   /* Magic value. */
94         uint32_t        md_version;     /* Version number. */
95         char            md_label[16];   /* Label. */
96         uint64_t        md_provsize;    /* Provider's size. */
97 };
98 static __inline void
99 label_metadata_encode(const struct g_label_metadata *md, u_char *data)
100 {
101
102         bcopy(md->md_magic, data, sizeof(md->md_magic));
103         le32enc(data + 16, md->md_version);
104         bcopy(md->md_label, data + 20, sizeof(md->md_label));
105         le64enc(data + 36, md->md_provsize);
106 }
107 static __inline void
108 label_metadata_decode(const u_char *data, struct g_label_metadata *md)
109 {
110
111         bcopy(data, md->md_magic, sizeof(md->md_magic));
112         md->md_version = le32dec(data + 16);
113         bcopy(data + 20, md->md_label, sizeof(md->md_label));
114         md->md_provsize = le64dec(data + 36);
115 }
116 #endif  /* _G_LABEL_H_ */