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
20 //config:config FEATURE_VOLUMEID_NTFS
21 //config: bool "ntfs filesystem"
23 //config: depends on VOLUMEID
25 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_NTFS) += ntfs.o
27 #include "volume_id_internal.h"
29 struct ntfs_super_block {
32 uint16_t bytes_per_sector;
33 uint8_t sectors_per_cluster;
34 uint16_t reserved_sectors;
36 uint16_t root_entries;
39 uint16_t sectors_per_fat;
40 uint16_t sectors_per_track;
42 uint32_t hidden_sectors;
43 uint32_t large_sectors;
45 uint64_t number_of_sectors;
46 uint64_t mft_cluster_location;
47 uint64_t mft_mirror_cluster_location;
48 int8_t cluster_per_mft_record;
50 int8_t cluster_per_index_record;
52 uint8_t volume_serial[8];
56 struct master_file_table_record {
61 uint16_t sequence_number;
63 uint16_t attrs_offset;
65 uint32_t bytes_in_use;
66 uint32_t bytes_allocated;
69 struct file_attribute {
78 uint16_t value_offset;
87 #define MFT_RECORD_VOLUME 3
88 #define MFT_RECORD_ATTR_VOLUME_NAME 0x60
89 #define MFT_RECORD_ATTR_VOLUME_INFO 0x70
90 #define MFT_RECORD_ATTR_OBJECT_ID 0x40
91 #define MFT_RECORD_ATTR_END 0xffffffffu
93 int FAST_FUNC volume_id_probe_ntfs(struct volume_id *id /*,uint64_t off*/)
95 #define off ((uint64_t)0)
97 unsigned cluster_size;
100 unsigned mft_record_size;
106 struct master_file_table_record *mftr;
107 struct ntfs_super_block *ns;
111 dbg("probing at offset 0x%llx", (unsigned long long) off);
113 ns = volume_id_get_buffer(id, off, 0x200);
117 if (memcmp(ns->oem_id, "NTFS", 4) != 0)
120 volume_id_set_uuid(id, ns->volume_serial, UUID_NTFS);
122 sector_size = le16_to_cpu(ns->bytes_per_sector);
123 cluster_size = ns->sectors_per_cluster * sector_size;
124 mft_cluster = le64_to_cpu(ns->mft_cluster_location);
125 mft_off = mft_cluster * cluster_size;
127 if (ns->cluster_per_mft_record < 0)
128 /* size = -log2(mft_record_size); normally 1024 Bytes */
129 mft_record_size = 1 << -ns->cluster_per_mft_record;
131 mft_record_size = ns->cluster_per_mft_record * cluster_size;
133 dbg("sectorsize 0x%x", sector_size);
134 dbg("clustersize 0x%x", cluster_size);
135 dbg("mftcluster %llu", (unsigned long long) mft_cluster);
136 dbg("mftoffset 0x%llx", (unsigned long long) mft_off);
137 dbg("cluster per mft_record %i", ns->cluster_per_mft_record);
138 dbg("mft record size %i", mft_record_size);
140 buf = volume_id_get_buffer(id, off + mft_off + (MFT_RECORD_VOLUME * mft_record_size),
145 mftr = (struct master_file_table_record*) buf;
147 dbg("mftr->magic '%c%c%c%c'", mftr->magic[0], mftr->magic[1], mftr->magic[2], mftr->magic[3]);
148 if (memcmp(mftr->magic, "FILE", 4) != 0)
151 attr_off = le16_to_cpu(mftr->attrs_offset);
152 dbg("file $Volume's attributes are at offset %i", attr_off);
155 struct file_attribute *attr;
157 attr = (struct file_attribute*) &buf[attr_off];
158 attr_type = le32_to_cpu(attr->type);
159 attr_len = le32_to_cpu(attr->len);
160 val_off = le16_to_cpu(attr->value_offset);
161 val_len = le32_to_cpu(attr->value_len);
162 attr_off += attr_len;
167 if (attr_off >= mft_record_size)
170 if (attr_type == MFT_RECORD_ATTR_END)
173 dbg("found attribute type 0x%x, len %i, at offset %i",
174 attr_type, attr_len, attr_off);
176 // if (attr_type == MFT_RECORD_ATTR_VOLUME_INFO) {
177 // struct volume_info *info;
178 // dbg("found info, len %i", val_len);
179 // info = (struct volume_info*) (((uint8_t *) attr) + val_off);
180 // snprintf(id->type_version, sizeof(id->type_version)-1,
181 // "%u.%u", info->major_ver, info->minor_ver);
184 if (attr_type == MFT_RECORD_ATTR_VOLUME_NAME) {
185 dbg("found label, len %i", val_len);
186 if (val_len > VOLUME_ID_LABEL_SIZE)
187 val_len = VOLUME_ID_LABEL_SIZE;
189 val = ((uint8_t *) attr) + val_off;
190 // volume_id_set_label_raw(id, val, val_len);
191 volume_id_set_label_unicode16(id, val, LE, val_len);
196 // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
197 IF_FEATURE_BLKID_TYPE(id->type = "ntfs";)