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 #include "volume_id_internal.h"
23 struct ntfs_super_block {
26 uint16_t bytes_per_sector;
27 uint8_t sectors_per_cluster;
28 uint16_t reserved_sectors;
30 uint16_t root_entries;
33 uint16_t sectors_per_fat;
34 uint16_t sectors_per_track;
36 uint32_t hidden_sectors;
37 uint32_t large_sectors;
39 uint64_t number_of_sectors;
40 uint64_t mft_cluster_location;
41 uint64_t mft_mirror_cluster_location;
42 int8_t cluster_per_mft_record;
44 int8_t cluster_per_index_record;
46 uint8_t volume_serial[8];
48 } __attribute__((__packed__));
50 struct master_file_table_record {
55 uint16_t sequence_number;
57 uint16_t attrs_offset;
59 uint32_t bytes_in_use;
60 uint32_t bytes_allocated;
61 } __attribute__((__packed__));
63 struct file_attribute {
72 uint16_t value_offset;
73 } __attribute__((__packed__));
79 } __attribute__((__packed__));
81 #define MFT_RECORD_VOLUME 3
82 #define MFT_RECORD_ATTR_VOLUME_NAME 0x60
83 #define MFT_RECORD_ATTR_VOLUME_INFO 0x70
84 #define MFT_RECORD_ATTR_OBJECT_ID 0x40
85 #define MFT_RECORD_ATTR_END 0xffffffffu
87 int volume_id_probe_ntfs(struct volume_id *id, uint64_t off)
90 unsigned cluster_size;
93 unsigned mft_record_size;
99 struct master_file_table_record *mftr;
100 struct ntfs_super_block *ns;
104 dbg("probing at offset 0x%llx", (unsigned long long) off);
106 ns = volume_id_get_buffer(id, off, 0x200);
110 if (memcmp(ns->oem_id, "NTFS", 4) != 0)
113 volume_id_set_uuid(id, ns->volume_serial, UUID_NTFS);
115 sector_size = le16_to_cpu(ns->bytes_per_sector);
116 cluster_size = ns->sectors_per_cluster * sector_size;
117 mft_cluster = le64_to_cpu(ns->mft_cluster_location);
118 mft_off = mft_cluster * cluster_size;
120 if (ns->cluster_per_mft_record < 0)
121 /* size = -log2(mft_record_size); normally 1024 Bytes */
122 mft_record_size = 1 << -ns->cluster_per_mft_record;
124 mft_record_size = ns->cluster_per_mft_record * cluster_size;
126 dbg("sectorsize 0x%x", sector_size);
127 dbg("clustersize 0x%x", cluster_size);
128 dbg("mftcluster %llu", (unsigned long long) mft_cluster);
129 dbg("mftoffset 0x%llx", (unsigned long long) mft_off);
130 dbg("cluster per mft_record %i", ns->cluster_per_mft_record);
131 dbg("mft record size %i", mft_record_size);
133 buf = volume_id_get_buffer(id, off + mft_off + (MFT_RECORD_VOLUME * mft_record_size),
138 mftr = (struct master_file_table_record*) buf;
140 dbg("mftr->magic '%c%c%c%c'", mftr->magic[0], mftr->magic[1], mftr->magic[2], mftr->magic[3]);
141 if (memcmp(mftr->magic, "FILE", 4) != 0)
144 attr_off = le16_to_cpu(mftr->attrs_offset);
145 dbg("file $Volume's attributes are at offset %i", attr_off);
148 struct file_attribute *attr;
150 attr = (struct file_attribute*) &buf[attr_off];
151 attr_type = le32_to_cpu(attr->type);
152 attr_len = le16_to_cpu(attr->len);
153 val_off = le16_to_cpu(attr->value_offset);
154 val_len = le32_to_cpu(attr->value_len);
155 attr_off += attr_len;
160 if (attr_off >= mft_record_size)
163 if (attr_type == MFT_RECORD_ATTR_END)
166 dbg("found attribute type 0x%x, len %i, at offset %i",
167 attr_type, attr_len, attr_off);
169 // if (attr_type == MFT_RECORD_ATTR_VOLUME_INFO) {
170 // struct volume_info *info;
171 // dbg("found info, len %i", val_len);
172 // info = (struct volume_info*) (((uint8_t *) attr) + val_off);
173 // snprintf(id->type_version, sizeof(id->type_version)-1,
174 // "%u.%u", info->major_ver, info->minor_ver);
177 if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
178 dbg("found label, len %i", val_len);
179 if (val_len > VOLUME_ID_LABEL_SIZE)
180 val_len = VOLUME_ID_LABEL_SIZE;
182 val = ((uint8_t *) attr) + val_off;
183 // volume_id_set_label_raw(id, val, val_len);
184 volume_id_set_label_unicode16(id, val, LE, val_len);
189 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
190 // id->type = "ntfs";