2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
26 #include "volume_id.h"
30 struct volume_descriptor {
31 struct descriptor_tag {
40 } __attribute__((__packed__)) tag;
42 struct anchor_descriptor {
45 } __attribute__((__packed__)) anchor;
46 struct primary_descriptor {
52 } __attribute__((__packed__)) ident;
53 } __attribute__((__packed__)) primary;
54 } __attribute__((__packed__)) type;
55 } __attribute__((__packed__));
57 struct volume_structure_descriptor {
61 } __attribute__((__packed__));
63 #define UDF_VSD_OFFSET 0x8000
65 int volume_id_probe_udf(struct volume_id *id, uint64_t off)
67 struct volume_descriptor *vd;
68 struct volume_structure_descriptor *vsd;
76 dbg("probing at offset 0x%llx", (unsigned long long) off);
78 vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET, 0x200);
82 if (memcmp(vsd->id, "NSR02", 5) == 0)
84 if (memcmp(vsd->id, "NSR03", 5) == 0)
86 if (memcmp(vsd->id, "BEA01", 5) == 0)
88 if (memcmp(vsd->id, "BOOT2", 5) == 0)
90 if (memcmp(vsd->id, "CD001", 5) == 0)
92 if (memcmp(vsd->id, "CDW02", 5) == 0)
94 if (memcmp(vsd->id, "TEA03", 5) == 0)
99 /* search the next VSD to get the logical block size of the volume */
100 for (bs = 0x800; bs < 0x8000; bs += 0x800) {
101 vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET + bs, 0x800);
104 dbg("test for blocksize: 0x%x", bs);
105 if (vsd->id[0] != '\0')
111 /* search the list of VSDs for a NSR descriptor */
112 for (b = 0; b < 64; b++) {
113 vsd = (struct volume_structure_descriptor *) volume_id_get_buffer(id, off + UDF_VSD_OFFSET + (b * bs), 0x800);
117 dbg("vsd: %c%c%c%c%c",
118 vsd->id[0], vsd->id[1], vsd->id[2], vsd->id[3], vsd->id[4]);
120 if (vsd->id[0] == '\0')
122 if (memcmp(vsd->id, "NSR02", 5) == 0)
124 if (memcmp(vsd->id, "NSR03", 5) == 0)
130 /* read anchor volume descriptor */
131 vd = (struct volume_descriptor *) volume_id_get_buffer(id, off + (256 * bs), 0x200);
135 type = le16_to_cpu(vd->tag.id);
136 if (type != 2) /* TAG_ID_AVDP */
139 /* get desriptor list address and block count */
140 count = le32_to_cpu(vd->type.anchor.length) / bs;
141 loc = le32_to_cpu(vd->type.anchor.location);
142 dbg("0x%x descriptors starting at logical secor 0x%x", count, loc);
144 /* pick the primary descriptor from the list */
145 for (b = 0; b < count; b++) {
146 vd = (struct volume_descriptor *) volume_id_get_buffer(id, off + ((loc + b) * bs), 0x200);
150 type = le16_to_cpu(vd->tag.id);
151 dbg("descriptor type %i", type);
156 if (le32_to_cpu(vd->tag.location) != loc + b)
159 if (type == 1) /* TAG_ID_PVD */
165 volume_id_set_label_raw(id, &(vd->type.primary.ident.clen), 32);
167 clen = vd->type.primary.ident.clen;
168 dbg("label string charsize=%i bit", clen);
170 volume_id_set_label_string(id, vd->type.primary.ident.c, 31);
172 volume_id_set_label_unicode16(id, vd->type.primary.ident.c, BE,31);
175 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);