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