2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2005 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"
24 /* Some detection routines do not set label or uuid anyway,
25 * so they are disabled. */
27 /* Looks for partitions, we don't use it: */
28 #define ENABLE_FEATURE_VOLUMEID_MAC 0
29 /* #define ENABLE_FEATURE_VOLUMEID_MSDOS 0 - NB: this one
30 * was not properly added to probe table anyway - ??! */
32 /* None of RAIDs have label or uuid, except LinuxRAID: */
33 #define ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID 0
34 #define ENABLE_FEATURE_VOLUMEID_ISWRAID 0
35 #define ENABLE_FEATURE_VOLUMEID_LSIRAID 0
36 #define ENABLE_FEATURE_VOLUMEID_LVM 0
37 #define ENABLE_FEATURE_VOLUMEID_NVIDIARAID 0
38 #define ENABLE_FEATURE_VOLUMEID_PROMISERAID 0
39 #define ENABLE_FEATURE_VOLUMEID_SILICONRAID 0
40 #define ENABLE_FEATURE_VOLUMEID_VIARAID 0
42 /* These filesystems also have no label or uuid: */
43 #define ENABLE_FEATURE_VOLUMEID_MINIX 0
44 #define ENABLE_FEATURE_VOLUMEID_HPFS 0
45 #define ENABLE_FEATURE_VOLUMEID_UFS 0
48 typedef int (*raid_probe_fptr)(struct volume_id *id, uint64_t off, uint64_t size);
49 typedef int (*probe_fptr)(struct volume_id *id, uint64_t off);
51 static const raid_probe_fptr raid1[] = {
52 #if ENABLE_FEATURE_VOLUMEID_LINUXRAID
53 volume_id_probe_linux_raid,
55 #if ENABLE_FEATURE_VOLUMEID_ISWRAID
56 volume_id_probe_intel_software_raid,
58 #if ENABLE_FEATURE_VOLUMEID_LSIRAID
59 volume_id_probe_lsi_mega_raid,
61 #if ENABLE_FEATURE_VOLUMEID_VIARAID
62 volume_id_probe_via_raid,
64 #if ENABLE_FEATURE_VOLUMEID_SILICONRAID
65 volume_id_probe_silicon_medley_raid,
67 #if ENABLE_FEATURE_VOLUMEID_NVIDIARAID
68 volume_id_probe_nvidia_raid,
70 #if ENABLE_FEATURE_VOLUMEID_PROMISERAID
71 volume_id_probe_promise_fasttrack_raid,
73 #if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
74 volume_id_probe_highpoint_45x_raid,
78 static const probe_fptr raid2[] = {
79 #if ENABLE_FEATURE_VOLUMEID_LVM
83 #if ENABLE_FEATURE_VOLUMEID_HIGHPOINTRAID
84 volume_id_probe_highpoint_37x_raid,
86 #if ENABLE_FEATURE_VOLUMEID_LUKS
91 /* signature in the first block, only small buffer needed */
92 static const probe_fptr fs1[] = {
93 #if ENABLE_FEATURE_VOLUMEID_FAT
96 #if ENABLE_FEATURE_VOLUMEID_MAC
97 volume_id_probe_mac_partition_map,
99 #if ENABLE_FEATURE_VOLUMEID_XFS
104 /* fill buffer with maximum */
105 static const probe_fptr fs2[] = {
106 #if ENABLE_FEATURE_VOLUMEID_LINUXSWAP
107 volume_id_probe_linux_swap,
109 #if ENABLE_FEATURE_VOLUMEID_EXT
112 #if ENABLE_FEATURE_VOLUMEID_REISERFS
113 volume_id_probe_reiserfs,
115 #if ENABLE_FEATURE_VOLUMEID_JFS
118 #if ENABLE_FEATURE_VOLUMEID_UDF
121 #if ENABLE_FEATURE_VOLUMEID_ISO9660
122 volume_id_probe_iso9660,
124 #if ENABLE_FEATURE_VOLUMEID_HFS
125 volume_id_probe_hfs_hfsplus,
127 #if ENABLE_FEATURE_VOLUMEID_UFS
130 #if ENABLE_FEATURE_VOLUMEID_NTFS
131 volume_id_probe_ntfs,
133 #if ENABLE_FEATURE_VOLUMEID_CRAMFS
134 volume_id_probe_cramfs,
136 #if ENABLE_FEATURE_VOLUMEID_ROMFS
137 volume_id_probe_romfs,
139 #if ENABLE_FEATURE_VOLUMEID_HPFS
140 volume_id_probe_hpfs,
142 #if ENABLE_FEATURE_VOLUMEID_SYSV
143 volume_id_probe_sysv,
145 #if ENABLE_FEATURE_VOLUMEID_MINIX
146 volume_id_probe_minix,
148 #if ENABLE_FEATURE_VOLUMEID_OCFS2
149 volume_id_probe_ocfs2,
153 int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
160 /* probe for raid first, cause fs probes may be successful on raid members */
162 for (i = 0; i < ARRAY_SIZE(raid1); i++)
163 if (raid1[i](id, off, size) == 0)
167 for (i = 0; i < ARRAY_SIZE(raid2); i++)
168 if (raid2[i](id, off) == 0)
171 /* signature in the first block, only small buffer needed */
172 for (i = 0; i < ARRAY_SIZE(fs1); i++)
173 if (fs1[i](id, off) == 0)
176 /* fill buffer with maximum */
177 volume_id_get_buffer(id, 0, SB_BUFFER_SIZE);
179 for (i = 0; i < ARRAY_SIZE(fs2); i++)
180 if (fs2[i](id, off) == 0)
185 /* If the filestystem in recognized, we free the allocated buffers,
186 otherwise they will stay in place for the possible next probe call */
187 volume_id_free_buffer(id);
192 /* open volume by device node */
193 struct volume_id *volume_id_open_node(int fd)
195 struct volume_id *id;
197 id = xzalloc(sizeof(struct volume_id));
199 ///* close fd on device close */
205 /* open volume by major/minor */
206 struct volume_id *volume_id_open_dev_t(dev_t devt)
208 struct volume_id *id;
209 char *tmp_node[VOLUME_ID_PATH_MAX];
211 tmp_node = xasprintf("/dev/.volume_id-%u-%u-%u",
212 (unsigned)getpid(), (unsigned)major(devt), (unsigned)minor(devt));
214 /* create temporary node to open block device */
216 if (mknod(tmp_node, (S_IFBLK | 0600), devt) != 0)
217 bb_perror_msg_and_die("cannot mknod(%s)", tmp_node);
219 id = volume_id_open_node(tmp_node);
226 void free_volume_id(struct volume_id *id)
231 //if (id->fd_close != 0) - always true
233 volume_id_free_buffer(id);
234 #ifdef UNUSED_PARTITION_CODE
235 free(id->partitions);