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_HPFS 0
46 #define ENABLE_FEATURE_VOLUMEID_UFS 0
47
48
49 typedef int FAST_FUNC (*raid_probe_fptr)(struct volume_id *id, /*uint64_t off,*/ uint64_t size);
50 typedef int FAST_FUNC (*probe_fptr)(struct volume_id *id /*, uint64_t off*/);
51
52 static const raid_probe_fptr raid1[] ALIGN_PTR = {
53 #if ENABLE_FEATURE_VOLUMEID_LINUXRAID
54 volume_id_probe_linux_raid,
55 #endif
56 #if ENABLE_FEATURE_VOLUMEID_ISWRAID
57 volume_id_probe_intel_software_raid,
58 #endif
59 #if ENABLE_FEATURE_VOLUMEID_LSIRAID
60 volume_id_probe_lsi_mega_raid,
61 #endif
62 #if ENABLE_FEATURE_VOLUMEID_VIARAID
63 volume_id_probe_via_raid,
64 #endif
65 #if ENABLE_FEATURE_VOLUMEID_SILICONRAID
66 volume_id_probe_silicon_medley_raid,
67 #endif
68 #if ENABLE_FEATURE_VOLUMEID_NVIDIARAID
69 volume_id_probe_nvidia_raid,
70 #endif
71 #if ENABLE_FEATURE_VOLUMEID_PROMISERAID
72 volume_id_probe_promise_fasttrack_raid,
73 #endif
74 #if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
75 volume_id_probe_highpoint_45x_raid,
76 #endif
77 };
78
79 static const probe_fptr raid2[] ALIGN_PTR = {
80 #if ENABLE_FEATURE_VOLUMEID_LVM
81 volume_id_probe_lvm1,
82 volume_id_probe_lvm2,
83 #endif
84 #if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
85 volume_id_probe_highpoint_37x_raid,
86 #endif
87 #if ENABLE_FEATURE_VOLUMEID_LUKS
88 volume_id_probe_luks,
89 #endif
90 };
91
92 /* signature in the first block, only small buffer needed */
93 static const probe_fptr fs1[] ALIGN_PTR = {
94 #if ENABLE_FEATURE_VOLUMEID_FAT
95 volume_id_probe_vfat,
96 #endif
97 #if ENABLE_FEATURE_VOLUMEID_EXFAT
98 volume_id_probe_exfat,
99 #endif
100 #if ENABLE_FEATURE_VOLUMEID_LFS
101 volume_id_probe_lfs,
102 #endif
103 #if ENABLE_FEATURE_VOLUMEID_MAC
104 volume_id_probe_mac_partition_map,
105 #endif
106 #if ENABLE_FEATURE_VOLUMEID_SQUASHFS
107 volume_id_probe_squashfs,
108 #endif
109 #if ENABLE_FEATURE_VOLUMEID_EROFS
110 volume_id_probe_erofs,
111 #endif
112 #if ENABLE_FEATURE_VOLUMEID_XFS
113 volume_id_probe_xfs,
114 #endif
115 #if ENABLE_FEATURE_VOLUMEID_BCACHE
116 volume_id_probe_bcache,
117 #endif
118 };
119
120 /* fill buffer with maximum */
121 static const probe_fptr fs2[] ALIGN_PTR = {
122 #if ENABLE_FEATURE_VOLUMEID_LINUXSWAP
123 volume_id_probe_linux_swap,
124 #endif
125 #if ENABLE_FEATURE_VOLUMEID_EXT
126 volume_id_probe_ext,
127 #endif
128 #if ENABLE_FEATURE_VOLUMEID_BTRFS
129 volume_id_probe_btrfs,
130 #endif
131 #if ENABLE_FEATURE_VOLUMEID_REISERFS
132 volume_id_probe_reiserfs,
133 #endif
134 #if ENABLE_FEATURE_VOLUMEID_JFS
135 volume_id_probe_jfs,
136 #endif
137 #if ENABLE_FEATURE_VOLUMEID_UDF
138 volume_id_probe_udf,
139 #endif
140 #if ENABLE_FEATURE_VOLUMEID_ISO9660
141 volume_id_probe_iso9660,
142 #endif
143 #if ENABLE_FEATURE_VOLUMEID_HFS
144 volume_id_probe_hfs_hfsplus,
145 #endif
146 #if ENABLE_FEATURE_VOLUMEID_UFS
147 volume_id_probe_ufs,
148 #endif
149 #if ENABLE_FEATURE_VOLUMEID_F2FS
150 volume_id_probe_f2fs,
151 #endif
152 #if ENABLE_FEATURE_VOLUMEID_NILFS
153 volume_id_probe_nilfs,
154 #endif
155 #if ENABLE_FEATURE_VOLUMEID_NTFS
156 volume_id_probe_ntfs,
157 #endif
158 #if ENABLE_FEATURE_VOLUMEID_CRAMFS
159 volume_id_probe_cramfs,
160 #endif
161 #if ENABLE_FEATURE_VOLUMEID_ROMFS
162 volume_id_probe_romfs,
163 #endif
164 #if ENABLE_FEATURE_VOLUMEID_HPFS
165 volume_id_probe_hpfs,
166 #endif
167 #if ENABLE_FEATURE_VOLUMEID_SYSV
168 volume_id_probe_sysv,
169 #endif
170 #if ENABLE_FEATURE_VOLUMEID_MINIX
171 volume_id_probe_minix,
172 #endif
173 #if ENABLE_FEATURE_VOLUMEID_OCFS2
174 volume_id_probe_ocfs2,
175 #endif
176 #if ENABLE_FEATURE_VOLUMEID_UBIFS
177 volume_id_probe_ubifs,
178 #endif
179 };
180
volume_id_probe_all(struct volume_id * id,uint64_t size)181 int FAST_FUNC volume_id_probe_all(struct volume_id *id, /*uint64_t off,*/ uint64_t size)
182 {
183 unsigned i;
184
185 /* probe for raid first, cause fs probes may be successful on raid members */
186 if (size) {
187 for (i = 0; i < ARRAY_SIZE(raid1); i++) {
188 if (raid1[i](id, /*off,*/ size) == 0)
189 goto ret;
190 if (id->error)
191 goto ret;
192 }
193 }
194
195 for (i = 0; i < ARRAY_SIZE(raid2); i++) {
196 if (raid2[i](id /*,off*/) == 0)
197 goto ret;
198 if (id->error)
199 goto ret;
200 }
201
202 /* signature in the first block, only small buffer needed */
203 for (i = 0; i < ARRAY_SIZE(fs1); i++) {
204 if (fs1[i](id /*,off*/) == 0)
205 goto ret;
206 if (id->error)
207 goto ret;
208 }
209
210 /* fill buffer with maximum */
211 volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
212
213 for (i = 0; i < ARRAY_SIZE(fs2); i++) {
214 if (fs2[i](id /*,off*/) == 0)
215 goto ret;
216 if (id->error)
217 goto ret;
218 }
219
220 ret:
221 volume_id_free_buffer(id);
222 return (- id->error); /* 0 or -1 */
223 }
224
225 /* open volume by device node */
volume_id_open_node(int fd)226 struct volume_id* FAST_FUNC volume_id_open_node(int fd)
227 {
228 struct volume_id *id;
229
230 id = xzalloc(sizeof(struct volume_id));
231 id->fd = fd;
232 ///* close fd on device close */
233 //id->fd_close = 1;
234 return id;
235 }
236
237 #ifdef UNUSED
238 /* open volume by major/minor */
volume_id_open_dev_t(dev_t devt)239 struct volume_id* FAST_FUNC volume_id_open_dev_t(dev_t devt)
240 {
241 struct volume_id *id;
242 char *tmp_node[VOLUME_ID_PATH_MAX];
243
244 tmp_node = xasprintf("/dev/.volume_id-%u-%u-%u",
245 (unsigned)getpid(), (unsigned)major(devt), (unsigned)minor(devt));
246
247 /* create temporary node to open block device */
248 unlink(tmp_node);
249 if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
250 bb_perror_msg_and_die("can't mknod(%s)", tmp_node);
251
252 id = volume_id_open_node(tmp_node);
253 unlink(tmp_node);
254 free(tmp_node);
255 return id;
256 }
257 #endif
258
free_volume_id(struct volume_id * id)259 void FAST_FUNC free_volume_id(struct volume_id *id)
260 {
261 if (id == NULL)
262 return;
263
264 //if (id->fd_close != 0) - always true
265 close(id->fd);
266 volume_id_free_buffer(id);
267 #ifdef UNUSED_PARTITION_CODE
268 free(id->partitions);
269 #endif
270 free(id);
271 }
272