2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
35 #include <asm/types.h>
37 #include "volume_id.h"
42 struct volume_descriptor {
43 struct descriptor_tag {
52 } __attribute__((__packed__)) tag;
54 struct anchor_descriptor {
57 } __attribute__((__packed__)) anchor;
58 struct primary_descriptor {
64 } __attribute__((__packed__)) ident;
65 } __attribute__((__packed__)) primary;
66 } __attribute__((__packed__)) type;
67 } __attribute__((__packed__));
69 struct volume_structure_descriptor {
73 } __attribute__((__packed__));
75 #define UDF_VSD_OFFSET 0x8000
77 int volume_id_probe_udf(struct volume_id *id, __u64 off)
79 struct volume_descriptor *vd;
80 struct volume_structure_descriptor *vsd;
88 dbg("probing at offset %llu", off);
90 vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET, 0x200);
94 if (memcmp(vsd->id, "NSR02", 5) == 0)
96 if (memcmp(vsd->id, "NSR03", 5) == 0)
98 if (memcmp(vsd->id, "BEA01", 5) == 0)
100 if (memcmp(vsd->id, "BOOT2", 5) == 0)
102 if (memcmp(vsd->id, "CD001", 5) == 0)
104 if (memcmp(vsd->id, "CDW02", 5) == 0)
106 if (memcmp(vsd->id, "TEA03", 5) == 0)
111 /* search the next VSD to get the logical block size of the volume */
112 for (bs = 0x800; bs < 0x8000; bs += 0x800) {
113 vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET + bs, 0x800);
116 dbg("test for blocksize: 0x%x", bs);
117 if (vsd->id[0] != '\0')
123 /* search the list of VSDs for a NSR descriptor */
124 for (b = 0; b < 64; b++) {
125 vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET + (b * bs), 0x800);
129 dbg("vsd: %c%c%c%c%c",
130 vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]);
132 if (vsd->id[0] == '\0')
134 if (memcmp(vsd->id, "NSR02", 5) == 0)
136 if (memcmp(vsd->id, "NSR03", 5) == 0)
142 /* read anchor volume descriptor */
143 vd = (struct volume_descriptor *) volume_id_get_buffer(id, off + (256 * bs), 0x200);
147 type = le16_to_cpu(vd->tag.id);
148 if (type != 2) /* TAG_ID_AVDP */
151 /* get desriptor list address and block count */
152 count = le32_to_cpu(vd->type.anchor.length) / bs;
153 loc = le32_to_cpu(vd->type.anchor.location);
154 dbg("0x%x descriptors starting at logical secor 0x%x", count, loc);
156 /* pick the primary descriptor from the list */
157 for (b = 0; b < count; b++) {
158 vd = (struct volume_descriptor *) volume_id_get_buffer(id, off + ((loc + b) * bs), 0x200);
162 type = le16_to_cpu(vd->tag.id);
163 dbg("descriptor type %i", type);
168 if (le32_to_cpu(vd->tag.location) != loc + b)
171 if (type == 1) /* TAG_ID_PVD */
177 volume_id_set_label_raw(id, &(vd->type.primary.ident.clen), 32);
179 clen = vd->type.primary.ident.clen;
180 dbg("label string charsize=%i bit", clen);
182 volume_id_set_label_string(id, vd->type.primary.ident.c, 31);
184 volume_id_set_label_unicode16(id, vd->type.primary.ident.c, BE,31);
187 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);