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/>.
30 #include <blkid/blkid.h>
37 static void print_property(struct udev_device
*dev
, bool test
, const char *name
, const char *value
) {
42 if (streq(name
, "TYPE")) {
43 udev_builtin_add_property(dev
, test
, "ID_FS_TYPE", value
);
45 } else if (streq(name
, "USAGE")) {
46 udev_builtin_add_property(dev
, test
, "ID_FS_USAGE", value
);
48 } else if (streq(name
, "VERSION")) {
49 udev_builtin_add_property(dev
, test
, "ID_FS_VERSION", value
);
51 } else if (streq(name
, "UUID")) {
52 blkid_safe_string(value
, s
, sizeof(s
));
53 udev_builtin_add_property(dev
, test
, "ID_FS_UUID", s
);
54 blkid_encode_string(value
, s
, sizeof(s
));
55 udev_builtin_add_property(dev
, test
, "ID_FS_UUID_ENC", s
);
57 } else if (streq(name
, "UUID_SUB")) {
58 blkid_safe_string(value
, s
, sizeof(s
));
59 udev_builtin_add_property(dev
, test
, "ID_FS_UUID_SUB", s
);
60 blkid_encode_string(value
, s
, sizeof(s
));
61 udev_builtin_add_property(dev
, test
, "ID_FS_UUID_SUB_ENC", s
);
63 } else if (streq(name
, "LABEL")) {
64 blkid_safe_string(value
, s
, sizeof(s
));
65 udev_builtin_add_property(dev
, test
, "ID_FS_LABEL", s
);
66 blkid_encode_string(value
, s
, sizeof(s
));
67 udev_builtin_add_property(dev
, test
, "ID_FS_LABEL_ENC", s
);
69 } else if (streq(name
, "PTTYPE")) {
70 udev_builtin_add_property(dev
, test
, "ID_PART_TABLE_TYPE", value
);
72 } else if (streq(name
, "PTUUID")) {
73 udev_builtin_add_property(dev
, test
, "ID_PART_TABLE_UUID", value
);
75 } else if (streq(name
, "PART_ENTRY_NAME")) {
76 blkid_encode_string(value
, s
, sizeof(s
));
77 udev_builtin_add_property(dev
, test
, "ID_PART_ENTRY_NAME", s
);
79 } else if (streq(name
, "PART_ENTRY_TYPE")) {
80 blkid_encode_string(value
, s
, sizeof(s
));
81 udev_builtin_add_property(dev
, test
, "ID_PART_ENTRY_TYPE", s
);
83 } else if (startswith(name
, "PART_ENTRY_")) {
84 strscpyl(s
, sizeof(s
), "ID_", name
, NULL
);
85 udev_builtin_add_property(dev
, test
, s
, value
);
87 } else if (streq(name
, "SYSTEM_ID")) {
88 blkid_encode_string(value
, s
, sizeof(s
));
89 udev_builtin_add_property(dev
, test
, "ID_FS_SYSTEM_ID", s
);
91 } else if (streq(name
, "PUBLISHER_ID")) {
92 blkid_encode_string(value
, s
, sizeof(s
));
93 udev_builtin_add_property(dev
, test
, "ID_FS_PUBLISHER_ID", s
);
95 } else if (streq(name
, "APPLICATION_ID")) {
96 blkid_encode_string(value
, s
, sizeof(s
));
97 udev_builtin_add_property(dev
, test
, "ID_FS_APPLICATION_ID", s
);
99 } else if (streq(name
, "BOOT_SYSTEM_ID")) {
100 blkid_encode_string(value
, s
, sizeof(s
));
101 udev_builtin_add_property(dev
, test
, "ID_FS_BOOT_SYSTEM_ID", s
);
105 static int find_gpt_root(struct udev_device
*dev
, blkid_probe pr
, bool test
) {
107 #if defined(GPT_ROOT_NATIVE) && defined(ENABLE_EFI)
109 _cleanup_free_
char *root_id
= NULL
;
110 bool found_esp
= false;
116 /* Iterate through the partitions on this disk, and see if the
117 * EFI ESP we booted from is on it. If so, find the first root
118 * disk, and add a property indicating its partition UUID. */
121 pl
= blkid_probe_get_partitions(pr
);
123 return errno
? -errno
: -ENOMEM
;
125 nvals
= blkid_partlist_numof_partitions(pl
);
126 for (i
= 0; i
< nvals
; i
++) {
128 const char *stype
, *sid
;
131 pp
= blkid_partlist_get_partition(pl
, i
);
135 sid
= blkid_partition_get_uuid(pp
);
139 stype
= blkid_partition_get_type_string(pp
);
143 if (sd_id128_from_string(stype
, &type
) < 0)
146 if (sd_id128_equal(type
, GPT_ESP
)) {
149 /* We found an ESP, let's see if it matches
150 * the ESP we booted from. */
152 if (sd_id128_from_string(sid
, &id
) < 0)
155 r
= efi_loader_get_device_part_uuid(&esp
);
159 if (sd_id128_equal(id
, esp
))
162 } else if (sd_id128_equal(type
, GPT_ROOT_NATIVE
)) {
164 /* We found a suitable root partition, let's
165 * remember the first one. */
168 root_id
= strdup(sid
);
175 /* We found the ESP on this disk, and also found a root
176 * partition, nice! Let's export its UUID */
177 if (found_esp
&& root_id
)
178 udev_builtin_add_property(dev
, test
, "ID_PART_GPT_AUTO_ROOT_UUID", root_id
);
184 static int probe_superblocks(blkid_probe pr
) {
188 if (fstat(blkid_probe_get_fd(pr
), &st
))
191 blkid_probe_enable_partitions(pr
, 1);
193 if (!S_ISCHR(st
.st_mode
) &&
194 blkid_probe_get_size(pr
) <= 1024 * 1440 &&
195 blkid_probe_is_wholedisk(pr
)) {
197 * check if the small disk is partitioned, if yes then
198 * don't probe for filesystems.
200 blkid_probe_enable_superblocks(pr
, 0);
202 rc
= blkid_do_fullprobe(pr
);
204 return rc
; /* -1 = error, 1 = nothing, 0 = success */
206 if (blkid_probe_lookup_value(pr
, "PTTYPE", NULL
, NULL
) == 0)
207 return 0; /* partition table detected */
210 blkid_probe_set_partitions_flags(pr
, BLKID_PARTS_ENTRY_DETAILS
);
211 blkid_probe_enable_superblocks(pr
, 1);
213 return blkid_do_safeprobe(pr
);
216 static int builtin_blkid(struct udev_device
*dev
, int argc
, char *argv
[], bool test
) {
217 const char *root_partition
;
220 _cleanup_close_
int fd
= -1;
224 const char *prtype
= NULL
;
230 static const struct option options
[] = {
231 { "offset", optional_argument
, NULL
, 'o' },
232 { "noraid", no_argument
, NULL
, 'R' },
239 option
= getopt_long(argc
, argv
, "oR", options
, NULL
);
245 offset
= strtoull(optarg
, NULL
, 0);
253 pr
= blkid_new_probe();
257 blkid_probe_set_superblocks_flags(pr
,
258 BLKID_SUBLKS_LABEL
| BLKID_SUBLKS_UUID
|
259 BLKID_SUBLKS_TYPE
| BLKID_SUBLKS_SECTYPE
|
260 BLKID_SUBLKS_USAGE
| BLKID_SUBLKS_VERSION
|
261 BLKID_SUBLKS_BADCSUM
);
264 blkid_probe_filter_superblocks_usage(pr
, BLKID_FLTR_NOTIN
, BLKID_USAGE_RAID
);
266 fd
= open(udev_device_get_devnode(dev
), O_RDONLY
|O_CLOEXEC
);
268 fprintf(stderr
, "error: %s: %m\n", udev_device_get_devnode(dev
));
272 err
= blkid_probe_set_device(pr
, fd
, offset
, 0);
276 log_debug("probe %s %sraid offset=%"PRIu64
,
277 udev_device_get_devnode(dev
),
278 noraid
? "no" : "", offset
);
280 err
= probe_superblocks(pr
);
283 if (blkid_probe_has_value(pr
, "SBBADCSUM")) {
284 if (!blkid_probe_lookup_value(pr
, "TYPE", &prtype
, NULL
))
285 log_warning("incorrect %s checksum on %s",
286 prtype
, udev_device_get_devnode(dev
));
288 log_warning("incorrect checksum on %s",
289 udev_device_get_devnode(dev
));
293 /* If we are a partition then our parent passed on the root
294 * partition UUID to us */
295 root_partition
= udev_device_get_property_value(dev
, "ID_PART_GPT_AUTO_ROOT_UUID");
297 nvals
= blkid_probe_numof_values(pr
);
298 for (i
= 0; i
< nvals
; i
++) {
299 if (blkid_probe_get_value(pr
, i
, &name
, &data
, NULL
))
302 print_property(dev
, test
, name
, data
);
304 /* Is this a disk with GPT partition table? */
305 if (streq(name
, "PTTYPE") && streq(data
, "gpt"))
308 /* Is this a partition that matches the root partition
309 * property we inherited from our parent? */
310 if (root_partition
&& streq(name
, "PART_ENTRY_UUID") && streq(data
, root_partition
))
311 udev_builtin_add_property(dev
, test
, "ID_PART_GPT_AUTO_ROOT", "1");
315 find_gpt_root(dev
, pr
, test
);
317 blkid_free_probe(pr
);
325 const struct udev_builtin udev_builtin_blkid
= {
327 .cmd
= builtin_blkid
,
328 .help
= "filesystem and partition probing",