1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2008 Marius Nuennerich
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 AUTHOR 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 AUTHOR 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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/kobj.h>
37 #include <sys/gpt.h>
38 #include <sys/sbuf.h>
39
40 #include <geom/geom.h>
41 #include <geom/label/g_label.h>
42 #include <geom/part/g_part.h>
43
44 #define PART_CLASS_NAME "PART"
45 #define SCHEME_NAME "GPT"
46
47 /* XXX: Also defined in geom/part/g_part_gpt.c */
48 struct g_part_gpt_entry {
49 struct g_part_entry base;
50 struct gpt_ent ent;
51 };
52
53 /* XXX: Shamelessly stolen from g_part_gpt.c */
54 static void
55 sbuf_nprintf_utf16(struct sbuf *sb, uint16_t *str, size_t len)
56 {
57 u_int bo;
58 uint32_t ch;
59 uint16_t c;
60
61 bo = LITTLE_ENDIAN; /* GPT is little-endian */
62 while (len > 0 && *str != 0) {
63 ch = (bo == BIG_ENDIAN) ? be16toh(*str) : le16toh(*str);
64 str++, len--;
65 if ((ch & 0xf800) == 0xd800) {
66 if (len > 0) {
67 c = (bo == BIG_ENDIAN) ? be16toh(*str)
68 : le16toh(*str);
69 str++, len--;
70 } else
71 c = 0xfffd;
72 if ((ch & 0x400) == 0 && (c & 0xfc00) == 0xdc00) {
73 ch = ((ch & 0x3ff) << 10) + (c & 0x3ff);
74 ch += 0x10000;
75 } else
76 ch = 0xfffd;
77 } else if (ch == 0xfffe) { /* BOM (U+FEFF) swapped. */
78 bo = (bo == BIG_ENDIAN) ? LITTLE_ENDIAN : BIG_ENDIAN;
79 continue;
80 } else if (ch == 0xfeff) /* BOM (U+FEFF) unswapped. */
81 continue;
82
83 /* Write the Unicode character in UTF-8 */
84 if (ch < 0x80)
85 sbuf_printf(sb, "%c", ch);
86 else if (ch < 0x800)
87 sbuf_printf(sb, "%c%c", 0xc0 | (ch >> 6),
88 0x80 | (ch & 0x3f));
89 else if (ch < 0x10000)
90 sbuf_printf(sb, "%c%c%c", 0xe0 | (ch >> 12),
91 0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f));
92 else if (ch < 0x200000)
93 sbuf_printf(sb, "%c%c%c%c", 0xf0 | (ch >> 18),
94 0x80 | ((ch >> 12) & 0x3f),
95 0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f));
96 }
97 }
98
99 static void
100 g_label_gpt_taste(struct g_consumer *cp, char *label, size_t size)
101 {
102 struct g_provider *pp;
103 struct g_part_table *tp;
104 struct g_part_gpt_entry *part_gpt_entry;
105 struct sbuf *lbl;
106
107 g_topology_assert_not();
108 pp = cp->provider;
109 tp = (struct g_part_table *)pp->geom->softc;
110 label[0] = '\0';
111
112 /* We taste only partitions handled by GPART */
113 if (strncmp(pp->geom->class->name, PART_CLASS_NAME, sizeof(PART_CLASS_NAME)))
114 return;
115 /* and only GPT */
116 if (strncmp(tp->gpt_scheme->name, SCHEME_NAME, sizeof(SCHEME_NAME)))
117 return;
118
119 part_gpt_entry = (struct g_part_gpt_entry *)pp->private;
120
121 /*
122 * Create sbuf with biggest possible size.
123 * We need max. 4 bytes for every 2-byte utf16 char.
124 */
125 lbl = sbuf_new(NULL, NULL, sizeof(part_gpt_entry->ent.ent_name) << 1, SBUF_FIXEDLEN);
126 /* Size is the number of characters, not bytes */
127 sbuf_nprintf_utf16(lbl, part_gpt_entry->ent.ent_name, sizeof(part_gpt_entry->ent.ent_name) >> 1);
128 sbuf_finish(lbl);
129 strlcpy(label, sbuf_data(lbl), size);
130 sbuf_delete(lbl);
131 }
132
133 static void
134 g_label_gpt_uuid_taste(struct g_consumer *cp, char *label, size_t size)
135 {
136 struct g_provider *pp;
137 struct g_part_table *tp;
138 struct g_part_gpt_entry *part_gpt_entry;
139
140 g_topology_assert_not();
141 pp = cp->provider;
142 tp = (struct g_part_table *)pp->geom->softc;
143 label[0] = '\0';
144
145 /* We taste only partitions handled by GPART */
146 if (strncmp(pp->geom->class->name, PART_CLASS_NAME, sizeof(PART_CLASS_NAME)))
147 return;
148 /* and only GPT */
149 if (strncmp(tp->gpt_scheme->name, SCHEME_NAME, sizeof(SCHEME_NAME)))
150 return;
151
152 part_gpt_entry = (struct g_part_gpt_entry *)pp->private;
153 snprintf_uuid(label, size, &part_gpt_entry->ent.ent_uuid);
154 }
155
156 struct g_label_desc g_label_gpt = {
157 .ld_taste = g_label_gpt_taste,
158 .ld_dirprefix = "gpt/",
159 .ld_enabled = 1
160 };
161
162 struct g_label_desc g_label_gpt_uuid = {
163 .ld_taste = g_label_gpt_uuid_taste,
164 .ld_dirprefix = "gptid/",
165 .ld_enabled = 1
166 };
167
168 G_LABEL_INIT(gpt, g_label_gpt, "Create device nodes for GPT labels");
169 G_LABEL_INIT(gptid, g_label_gpt_uuid, "Create device nodes for GPT UUIDs");
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