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path: root/util-linux/volume_id/volume_id.c (plain)
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1/*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
5 *
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.
10 *
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.
15 *
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
19 */
20
21//kbuild:lib-$(CONFIG_VOLUMEID) += volume_id.o util.o
22
23#include "volume_id_internal.h"
24
25
26/* Some detection routines do not set label or uuid anyway,
27 * so they are disabled. */
28
29/* Looks for partitions, we don't use it: */
30#define ENABLE_FEATURE_VOLUMEID_MAC 0
31/* #define ENABLE_FEATURE_VOLUMEID_MSDOS 0 - NB: this one
32 * was not properly added to probe table anyway - ??! */
33
34/* None of RAIDs have label or uuid, except LinuxRAID: */
35#define ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID 0
36#define ENABLE_FEATURE_VOLUMEID_ISWRAID 0
37#define ENABLE_FEATURE_VOLUMEID_LSIRAID 0
38#define ENABLE_FEATURE_VOLUMEID_LVM 0
39#define ENABLE_FEATURE_VOLUMEID_NVIDIARAID 0
40#define ENABLE_FEATURE_VOLUMEID_PROMISERAID 0
41#define ENABLE_FEATURE_VOLUMEID_SILICONRAID 0
42#define ENABLE_FEATURE_VOLUMEID_VIARAID 0
43
44/* These filesystems also have no label or uuid: */
45#define ENABLE_FEATURE_VOLUMEID_MINIX 0
46#define ENABLE_FEATURE_VOLUMEID_HPFS 0
47#define ENABLE_FEATURE_VOLUMEID_UFS 0
48
49
50typedef int FAST_FUNC (*raid_probe_fptr)(struct volume_id *id, /*uint64_t off,*/ uint64_t size);
51typedef int FAST_FUNC (*probe_fptr)(struct volume_id *id /*, uint64_t off*/);
52
53static const raid_probe_fptr raid1[] = {
54#if ENABLE_FEATURE_VOLUMEID_LINUXRAID
55 volume_id_probe_linux_raid,
56#endif
57#if ENABLE_FEATURE_VOLUMEID_ISWRAID
58 volume_id_probe_intel_software_raid,
59#endif
60#if ENABLE_FEATURE_VOLUMEID_LSIRAID
61 volume_id_probe_lsi_mega_raid,
62#endif
63#if ENABLE_FEATURE_VOLUMEID_VIARAID
64 volume_id_probe_via_raid,
65#endif
66#if ENABLE_FEATURE_VOLUMEID_SILICONRAID
67 volume_id_probe_silicon_medley_raid,
68#endif
69#if ENABLE_FEATURE_VOLUMEID_NVIDIARAID
70 volume_id_probe_nvidia_raid,
71#endif
72#if ENABLE_FEATURE_VOLUMEID_PROMISERAID
73 volume_id_probe_promise_fasttrack_raid,
74#endif
75#if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
76 volume_id_probe_highpoint_45x_raid,
77#endif
78};
79
80static const probe_fptr raid2[] = {
81#if ENABLE_FEATURE_VOLUMEID_LVM
82 volume_id_probe_lvm1,
83 volume_id_probe_lvm2,
84#endif
85#if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
86 volume_id_probe_highpoint_37x_raid,
87#endif
88#if ENABLE_FEATURE_VOLUMEID_LUKS
89 volume_id_probe_luks,
90#endif
91};
92
93/* signature in the first block, only small buffer needed */
94static const probe_fptr fs1[] = {
95#if ENABLE_FEATURE_VOLUMEID_FAT
96 volume_id_probe_vfat,
97#endif
98#if ENABLE_FEATURE_VOLUMEID_EXFAT
99 volume_id_probe_exfat,
100#endif
101#if ENABLE_FEATURE_VOLUMEID_MAC
102 volume_id_probe_mac_partition_map,
103#endif
104#if ENABLE_FEATURE_VOLUMEID_SQUASHFS
105 volume_id_probe_squashfs,
106#endif
107#if ENABLE_FEATURE_VOLUMEID_XFS
108 volume_id_probe_xfs,
109#endif
110#if ENABLE_FEATURE_VOLUMEID_BCACHE
111 volume_id_probe_bcache,
112#endif
113};
114
115/* fill buffer with maximum */
116static const probe_fptr fs2[] = {
117#if ENABLE_FEATURE_VOLUMEID_LINUXSWAP
118 volume_id_probe_linux_swap,
119#endif
120#if ENABLE_FEATURE_VOLUMEID_EXT
121 volume_id_probe_ext,
122#endif
123#if ENABLE_FEATURE_VOLUMEID_BTRFS
124 volume_id_probe_btrfs,
125#endif
126#if ENABLE_FEATURE_VOLUMEID_REISERFS
127 volume_id_probe_reiserfs,
128#endif
129#if ENABLE_FEATURE_VOLUMEID_JFS
130 volume_id_probe_jfs,
131#endif
132#if ENABLE_FEATURE_VOLUMEID_UDF
133 volume_id_probe_udf,
134#endif
135#if ENABLE_FEATURE_VOLUMEID_ISO9660
136 volume_id_probe_iso9660,
137#endif
138#if ENABLE_FEATURE_VOLUMEID_HFS
139 volume_id_probe_hfs_hfsplus,
140#endif
141#if ENABLE_FEATURE_VOLUMEID_UFS
142 volume_id_probe_ufs,
143#endif
144#if ENABLE_FEATURE_VOLUMEID_F2FS
145 volume_id_probe_f2fs,
146#endif
147#if ENABLE_FEATURE_VOLUMEID_NILFS
148 volume_id_probe_nilfs,
149#endif
150#if ENABLE_FEATURE_VOLUMEID_NTFS
151 volume_id_probe_ntfs,
152#endif
153#if ENABLE_FEATURE_VOLUMEID_CRAMFS
154 volume_id_probe_cramfs,
155#endif
156#if ENABLE_FEATURE_VOLUMEID_ROMFS
157 volume_id_probe_romfs,
158#endif
159#if ENABLE_FEATURE_VOLUMEID_HPFS
160 volume_id_probe_hpfs,
161#endif
162#if ENABLE_FEATURE_VOLUMEID_SYSV
163 volume_id_probe_sysv,
164#endif
165#if ENABLE_FEATURE_VOLUMEID_MINIX
166 volume_id_probe_minix,
167#endif
168#if ENABLE_FEATURE_VOLUMEID_OCFS2
169 volume_id_probe_ocfs2,
170#endif
171#if ENABLE_FEATURE_VOLUMEID_UBIFS
172 volume_id_probe_ubifs,
173#endif
174};
175
176int FAST_FUNC volume_id_probe_all(struct volume_id *id, /*uint64_t off,*/ uint64_t size)
177{
178 unsigned i, arsize;
179
180 /* probe for raid first, cause fs probes may be successful on raid members */
181 if (size) {
182 arsize=ARRAY_SIZE(raid1);
183 for (i = 0; i < arsize; i++) {
184 if (raid1[i](id, /*off,*/ size) == 0)
185 goto ret;
186 if (id->error)
187 goto ret;
188 }
189 }
190
191 arsize=ARRAY_SIZE(raid2);
192 for (i = 0; i < arsize; i++) {
193 if (raid2[i](id /*,off*/) == 0)
194 goto ret;
195 if (id->error)
196 goto ret;
197 }
198
199 /* signature in the first block, only small buffer needed */
200 arsize=ARRAY_SIZE(fs1);
201 for (i = 0; i < arsize; i++) {
202 if (fs1[i](id /*,off*/) == 0)
203 goto ret;
204 if (id->error)
205 goto ret;
206 }
207
208
209 /* fill buffer with maximum */
210 volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
211
212 arsize=ARRAY_SIZE(fs2);
213 for (i = 0; i < arsize; i++) {
214 if (fs2[i](id /*,off*/) == 0)
215 break;
216 if (id->error)
217 break;
218 }
219
220 volume_id_free_buffer(id);
221
222ret:
223 return (- id->error); /* 0 or -1 */
224}
225
226/* open volume by device node */
227struct volume_id* FAST_FUNC volume_id_open_node(int fd)
228{
229 struct volume_id *id;
230
231 id = xzalloc(sizeof(struct volume_id));
232 id->fd = fd;
233 ///* close fd on device close */
234 //id->fd_close = 1;
235 return id;
236}
237
238#ifdef UNUSED
239/* open volume by major/minor */
240struct volume_id* FAST_FUNC volume_id_open_dev_t(dev_t devt)
241{
242 struct volume_id *id;
243 char *tmp_node[VOLUME_ID_PATH_MAX];
244
245 tmp_node = xasprintf("/dev/.volume_id-%u-%u-%u",
246 (unsigned)getpid(), (unsigned)major(devt), (unsigned)minor(devt));
247
248 /* create temporary node to open block device */
249 unlink(tmp_node);
250 if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
251 bb_perror_msg_and_die("can't mknod(%s)", tmp_node);
252
253 id = volume_id_open_node(tmp_node);
254 unlink(tmp_node);
255 free(tmp_node);
256 return id;
257}
258#endif
259
260void FAST_FUNC free_volume_id(struct volume_id *id)
261{
262 if (id == NULL)
263 return;
264
265 //if (id->fd_close != 0) - always true
266 close(id->fd);
267 volume_id_free_buffer(id);
268#ifdef UNUSED_PARTITION_CODE
269 free(id->partitions);
270#endif
271 free(id);
272}
273