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path: root/util-linux/volume_id/volume_id.c (plain)
blob: 66690c2fd8755407792ea47aeb1be8de453d31a1
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};
111
112/* fill buffer with maximum */
113static const probe_fptr fs2[] = {
114#if ENABLE_FEATURE_VOLUMEID_LINUXSWAP
115 volume_id_probe_linux_swap,
116#endif
117#if ENABLE_FEATURE_VOLUMEID_EXT
118 volume_id_probe_ext,
119#endif
120#if ENABLE_FEATURE_VOLUMEID_BTRFS
121 volume_id_probe_btrfs,
122#endif
123#if ENABLE_FEATURE_VOLUMEID_REISERFS
124 volume_id_probe_reiserfs,
125#endif
126#if ENABLE_FEATURE_VOLUMEID_JFS
127 volume_id_probe_jfs,
128#endif
129#if ENABLE_FEATURE_VOLUMEID_UDF
130 volume_id_probe_udf,
131#endif
132#if ENABLE_FEATURE_VOLUMEID_ISO9660
133 volume_id_probe_iso9660,
134#endif
135#if ENABLE_FEATURE_VOLUMEID_HFS
136 volume_id_probe_hfs_hfsplus,
137#endif
138#if ENABLE_FEATURE_VOLUMEID_UFS
139 volume_id_probe_ufs,
140#endif
141#if ENABLE_FEATURE_VOLUMEID_F2FS
142 volume_id_probe_f2fs,
143#endif
144#if ENABLE_FEATURE_VOLUMEID_NILFS
145 volume_id_probe_nilfs,
146#endif
147#if ENABLE_FEATURE_VOLUMEID_NTFS
148 volume_id_probe_ntfs,
149#endif
150#if ENABLE_FEATURE_VOLUMEID_CRAMFS
151 volume_id_probe_cramfs,
152#endif
153#if ENABLE_FEATURE_VOLUMEID_ROMFS
154 volume_id_probe_romfs,
155#endif
156#if ENABLE_FEATURE_VOLUMEID_HPFS
157 volume_id_probe_hpfs,
158#endif
159#if ENABLE_FEATURE_VOLUMEID_SYSV
160 volume_id_probe_sysv,
161#endif
162#if ENABLE_FEATURE_VOLUMEID_MINIX
163 volume_id_probe_minix,
164#endif
165#if ENABLE_FEATURE_VOLUMEID_OCFS2
166 volume_id_probe_ocfs2,
167#endif
168};
169
170int FAST_FUNC volume_id_probe_all(struct volume_id *id, /*uint64_t off,*/ uint64_t size)
171{
172 unsigned i, arsize;
173
174 /* probe for raid first, cause fs probes may be successful on raid members */
175 if (size) {
176 arsize=ARRAY_SIZE(raid1);
177 for (i = 0; i < arsize; i++) {
178 if (raid1[i](id, /*off,*/ size) == 0)
179 goto ret;
180 if (id->error)
181 goto ret;
182 }
183 }
184
185 arsize=ARRAY_SIZE(raid2);
186 for (i = 0; i < arsize; i++) {
187 if (raid2[i](id /*,off*/) == 0)
188 goto ret;
189 if (id->error)
190 goto ret;
191 }
192
193 /* signature in the first block, only small buffer needed */
194 arsize=ARRAY_SIZE(fs1);
195 for (i = 0; i < arsize; i++) {
196 if (fs1[i](id /*,off*/) == 0)
197 goto ret;
198 if (id->error)
199 goto ret;
200 }
201
202
203 /* fill buffer with maximum */
204 volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
205
206 arsize=ARRAY_SIZE(fs2);
207 for (i = 0; i < arsize; i++) {
208 if (fs2[i](id /*,off*/) == 0)
209 break;
210 if (id->error)
211 break;
212 }
213
214 volume_id_free_buffer(id);
215
216ret:
217 return (- id->error); /* 0 or -1 */
218}
219
220/* open volume by device node */
221struct volume_id* FAST_FUNC volume_id_open_node(int fd)
222{
223 struct volume_id *id;
224
225 id = xzalloc(sizeof(struct volume_id));
226 id->fd = fd;
227 ///* close fd on device close */
228 //id->fd_close = 1;
229 return id;
230}
231
232#ifdef UNUSED
233/* open volume by major/minor */
234struct volume_id* FAST_FUNC volume_id_open_dev_t(dev_t devt)
235{
236 struct volume_id *id;
237 char *tmp_node[VOLUME_ID_PATH_MAX];
238
239 tmp_node = xasprintf("/dev/.volume_id-%u-%u-%u",
240 (unsigned)getpid(), (unsigned)major(devt), (unsigned)minor(devt));
241
242 /* create temporary node to open block device */
243 unlink(tmp_node);
244 if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
245 bb_perror_msg_and_die("can't mknod(%s)", tmp_node);
246
247 id = volume_id_open_node(tmp_node);
248 unlink(tmp_node);
249 free(tmp_node);
250 return id;
251}
252#endif
253
254void FAST_FUNC free_volume_id(struct volume_id *id)
255{
256 if (id == NULL)
257 return;
258
259 //if (id->fd_close != 0) - always true
260 close(id->fd);
261 volume_id_free_buffer(id);
262#ifdef UNUSED_PARTITION_CODE
263 free(id->partitions);
264#endif
265 free(id);
266}
267
generated by cgit at 2024-05-15 04:03:50 (GMT)