2 * probe disks for filesystems and partitions
4 * Copyright (C) 2011 Kay Sievers <kay@vrfy.org>
5 * Copyright (C) 2011 Karel Zak <kzak@redhat.com>
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include <blkid/blkid.h>
32 #include "alloc-util.h"
36 #include "string-util.h"
39 static void print_property(struct udev_device
*dev
, bool test
, const char *name
, const char *value
) {
44 if (streq(name
, "TYPE")) {
45 udev_builtin_add_property(dev
, test
, "ID_FS_TYPE", value
);
47 } else if (streq(name
, "USAGE")) {
48 udev_builtin_add_property(dev
, test
, "ID_FS_USAGE", value
);
50 } else if (streq(name
, "VERSION")) {
51 udev_builtin_add_property(dev
, test
, "ID_FS_VERSION", value
);
53 } else if (streq(name
, "UUID")) {
54 blkid_safe_string(value
, s
, sizeof(s
));
55 udev_builtin_add_property(dev
, test
, "ID_FS_UUID", s
);
56 blkid_encode_string(value
, s
, sizeof(s
));
57 udev_builtin_add_property(dev
, test
, "ID_FS_UUID_ENC", s
);
59 } else if (streq(name
, "UUID_SUB")) {
60 blkid_safe_string(value
, s
, sizeof(s
));
61 udev_builtin_add_property(dev
, test
, "ID_FS_UUID_SUB", s
);
62 blkid_encode_string(value
, s
, sizeof(s
));
63 udev_builtin_add_property(dev
, test
, "ID_FS_UUID_SUB_ENC", s
);
65 } else if (streq(name
, "LABEL")) {
66 blkid_safe_string(value
, s
, sizeof(s
));
67 udev_builtin_add_property(dev
, test
, "ID_FS_LABEL", s
);
68 blkid_encode_string(value
, s
, sizeof(s
));
69 udev_builtin_add_property(dev
, test
, "ID_FS_LABEL_ENC", s
);
71 } else if (streq(name
, "PTTYPE")) {
72 udev_builtin_add_property(dev
, test
, "ID_PART_TABLE_TYPE", value
);
74 } else if (streq(name
, "PTUUID")) {
75 udev_builtin_add_property(dev
, test
, "ID_PART_TABLE_UUID", value
);
77 } else if (streq(name
, "PART_ENTRY_NAME")) {
78 blkid_encode_string(value
, s
, sizeof(s
));
79 udev_builtin_add_property(dev
, test
, "ID_PART_ENTRY_NAME", s
);
81 } else if (streq(name
, "PART_ENTRY_TYPE")) {
82 blkid_encode_string(value
, s
, sizeof(s
));
83 udev_builtin_add_property(dev
, test
, "ID_PART_ENTRY_TYPE", s
);
85 } else if (startswith(name
, "PART_ENTRY_")) {
86 strscpyl(s
, sizeof(s
), "ID_", name
, NULL
);
87 udev_builtin_add_property(dev
, test
, s
, value
);
89 } else if (streq(name
, "SYSTEM_ID")) {
90 blkid_encode_string(value
, s
, sizeof(s
));
91 udev_builtin_add_property(dev
, test
, "ID_FS_SYSTEM_ID", s
);
93 } else if (streq(name
, "PUBLISHER_ID")) {
94 blkid_encode_string(value
, s
, sizeof(s
));
95 udev_builtin_add_property(dev
, test
, "ID_FS_PUBLISHER_ID", s
);
97 } else if (streq(name
, "APPLICATION_ID")) {
98 blkid_encode_string(value
, s
, sizeof(s
));
99 udev_builtin_add_property(dev
, test
, "ID_FS_APPLICATION_ID", s
);
101 } else if (streq(name
, "BOOT_SYSTEM_ID")) {
102 blkid_encode_string(value
, s
, sizeof(s
));
103 udev_builtin_add_property(dev
, test
, "ID_FS_BOOT_SYSTEM_ID", s
);
107 static int find_gpt_root(struct udev_device
*dev
, blkid_probe pr
, bool test
) {
109 #if defined(GPT_ROOT_NATIVE) && defined(ENABLE_EFI)
111 _cleanup_free_
char *root_id
= NULL
;
112 bool found_esp
= false;
118 /* Iterate through the partitions on this disk, and see if the
119 * EFI ESP we booted from is on it. If so, find the first root
120 * disk, and add a property indicating its partition UUID. */
123 pl
= blkid_probe_get_partitions(pr
);
125 return errno
> 0 ? -errno
: -ENOMEM
;
127 nvals
= blkid_partlist_numof_partitions(pl
);
128 for (i
= 0; i
< nvals
; i
++) {
130 const char *stype
, *sid
;
133 pp
= blkid_partlist_get_partition(pl
, i
);
137 sid
= blkid_partition_get_uuid(pp
);
141 stype
= blkid_partition_get_type_string(pp
);
145 if (sd_id128_from_string(stype
, &type
) < 0)
148 if (sd_id128_equal(type
, GPT_ESP
)) {
151 /* We found an ESP, let's see if it matches
152 * the ESP we booted from. */
154 if (sd_id128_from_string(sid
, &id
) < 0)
157 r
= efi_loader_get_device_part_uuid(&esp
);
161 if (sd_id128_equal(id
, esp
))
164 } else if (sd_id128_equal(type
, GPT_ROOT_NATIVE
)) {
165 unsigned long long flags
;
167 flags
= blkid_partition_get_flags(pp
);
168 if (flags
& GPT_FLAG_NO_AUTO
)
171 /* We found a suitable root partition, let's
172 * remember the first one. */
175 root_id
= strdup(sid
);
182 /* We found the ESP on this disk, and also found a root
183 * partition, nice! Let's export its UUID */
184 if (found_esp
&& root_id
)
185 udev_builtin_add_property(dev
, test
, "ID_PART_GPT_AUTO_ROOT_UUID", root_id
);
191 static int probe_superblocks(blkid_probe pr
) {
195 if (fstat(blkid_probe_get_fd(pr
), &st
))
198 blkid_probe_enable_partitions(pr
, 1);
200 if (!S_ISCHR(st
.st_mode
) &&
201 blkid_probe_get_size(pr
) <= 1024 * 1440 &&
202 blkid_probe_is_wholedisk(pr
)) {
204 * check if the small disk is partitioned, if yes then
205 * don't probe for filesystems.
207 blkid_probe_enable_superblocks(pr
, 0);
209 rc
= blkid_do_fullprobe(pr
);
211 return rc
; /* -1 = error, 1 = nothing, 0 = success */
213 if (blkid_probe_lookup_value(pr
, "PTTYPE", NULL
, NULL
) == 0)
214 return 0; /* partition table detected */
217 blkid_probe_set_partitions_flags(pr
, BLKID_PARTS_ENTRY_DETAILS
);
218 blkid_probe_enable_superblocks(pr
, 1);
220 return blkid_do_safeprobe(pr
);
223 static int builtin_blkid(struct udev_device
*dev
, int argc
, char *argv
[], bool test
) {
224 const char *root_partition
;
227 _cleanup_close_
int fd
= -1;
231 const char *prtype
= NULL
;
237 static const struct option options
[] = {
238 { "offset", optional_argument
, NULL
, 'o' },
239 { "noraid", no_argument
, NULL
, 'R' },
246 option
= getopt_long(argc
, argv
, "oR", options
, NULL
);
252 offset
= strtoull(optarg
, NULL
, 0);
260 pr
= blkid_new_probe();
264 blkid_probe_set_superblocks_flags(pr
,
265 BLKID_SUBLKS_LABEL
| BLKID_SUBLKS_UUID
|
266 BLKID_SUBLKS_TYPE
| BLKID_SUBLKS_SECTYPE
|
267 BLKID_SUBLKS_USAGE
| BLKID_SUBLKS_VERSION
|
268 BLKID_SUBLKS_BADCSUM
);
271 blkid_probe_filter_superblocks_usage(pr
, BLKID_FLTR_NOTIN
, BLKID_USAGE_RAID
);
273 fd
= open(udev_device_get_devnode(dev
), O_RDONLY
|O_CLOEXEC
);
275 err
= log_debug_errno(errno
, "Failure opening block device %s: %m", udev_device_get_devnode(dev
));
279 err
= blkid_probe_set_device(pr
, fd
, offset
, 0);
283 log_debug("probe %s %sraid offset=%"PRIi64
,
284 udev_device_get_devnode(dev
),
285 noraid
? "no" : "", offset
);
287 err
= probe_superblocks(pr
);
290 if (blkid_probe_has_value(pr
, "SBBADCSUM")) {
291 if (!blkid_probe_lookup_value(pr
, "TYPE", &prtype
, NULL
))
292 log_warning("incorrect %s checksum on %s",
293 prtype
, udev_device_get_devnode(dev
));
295 log_warning("incorrect checksum on %s",
296 udev_device_get_devnode(dev
));
300 /* If we are a partition then our parent passed on the root
301 * partition UUID to us */
302 root_partition
= udev_device_get_property_value(dev
, "ID_PART_GPT_AUTO_ROOT_UUID");
304 nvals
= blkid_probe_numof_values(pr
);
305 for (i
= 0; i
< nvals
; i
++) {
306 if (blkid_probe_get_value(pr
, i
, &name
, &data
, NULL
))
309 print_property(dev
, test
, name
, data
);
311 /* Is this a disk with GPT partition table? */
312 if (streq(name
, "PTTYPE") && streq(data
, "gpt"))
315 /* Is this a partition that matches the root partition
316 * property we inherited from our parent? */
317 if (root_partition
&& streq(name
, "PART_ENTRY_UUID") && streq(data
, root_partition
))
318 udev_builtin_add_property(dev
, test
, "ID_PART_GPT_AUTO_ROOT", "1");
322 find_gpt_root(dev
, pr
, test
);
324 blkid_free_probe(pr
);
332 const struct udev_builtin udev_builtin_blkid
= {
334 .cmd
= builtin_blkid
,
335 .help
= "Filesystem and partition probing",