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
21 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_UDF) += udf.o
23 //config:config FEATURE_VOLUMEID_UDF
24 //config: bool "udf filesystem"
26 //config: depends on VOLUMEID
28 #include "volume_id_internal.h"
30 struct volume_descriptor {
31 struct descriptor_tag {
42 struct anchor_descriptor {
46 struct primary_descriptor {
57 struct volume_structure_descriptor {
63 #define UDF_VSD_OFFSET 0x8000
65 int FAST_FUNC volume_id_probe_udf(struct volume_id *id /*,uint64_t off*/)
67 #define off ((uint64_t)0)
68 struct volume_descriptor *vd;
69 struct volume_structure_descriptor *vsd;
77 dbg("probing at offset 0x%llx", (unsigned long long) off);
79 vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET, 0x200);
83 if (memcmp(vsd->id, "NSR02", 5) == 0)
85 if (memcmp(vsd->id, "NSR03", 5) == 0)
87 if (memcmp(vsd->id, "BEA01", 5) == 0)
89 if (memcmp(vsd->id, "BOOT2", 5) == 0)
91 if (memcmp(vsd->id, "CD001", 5) == 0)
93 if (memcmp(vsd->id, "CDW02", 5) == 0)
95 if (memcmp(vsd->id, "TEA03", 5) == 0)
100 /* search the next VSD to get the logical block size of the volume */
101 for (bs = 0x800; bs < 0x8000; bs += 0x800) {
102 vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET + bs, 0x800);
105 dbg("test for blocksize: 0x%x", bs);
106 if (vsd->id[0] != '\0')
112 /* search the list of VSDs for a NSR descriptor */
113 for (b = 0; b < 64; b++) {
114 vsd = volume_id_get_buffer(id, off + UDF_VSD_OFFSET + (b * bs), 0x800);
118 dbg("vsd: %c%c%c%c%c",
119 vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]);
121 if (vsd->id[0] == '\0')
123 if (memcmp(vsd->id, "NSR02", 5) == 0)
125 if (memcmp(vsd->id, "NSR03", 5) == 0)
131 /* read anchor volume descriptor */
132 vd = volume_id_get_buffer(id, off + (256 * bs), 0x200);
136 type = le16_to_cpu(vd->tag.id);
137 if (type != 2) /* TAG_ID_AVDP */
140 /* get descriptor list address and block count */
141 count = le32_to_cpu(vd->type.anchor.length) / bs;
142 loc = le32_to_cpu(vd->type.anchor.location);
143 dbg("0x%x descriptors starting at logical secor 0x%x", count, loc);
145 /* pick the primary descriptor from the list */
146 for (b = 0; b < count; b++) {
147 vd = volume_id_get_buffer(id, off + ((loc + b) * bs), 0x200);
151 type = le16_to_cpu(vd->tag.id);
152 dbg("descriptor type %i", type);
157 if (le32_to_cpu(vd->tag.location) != loc + b)
160 if (type == 1) /* TAG_ID_PVD */
166 // volume_id_set_label_raw(id, &(vd->type.primary.ident.clen), 32);
168 clen = vd->type.primary.ident.clen;
169 dbg("label string charsize=%i bit", clen);
171 volume_id_set_label_string(id, vd->type.primary.ident.c, 31);
173 volume_id_set_label_unicode16(id, vd->type.primary.ident.c, BE, 31);
176 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
177 IF_FEATURE_BLKID_TYPE(id->type = "udf";)