1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/*
* Author: Kent Overstreet <kmo@daterainc.com>
*
* GPLv2
*/
#define _FILE_OFFSET_BITS 64
#define __USE_FILE_OFFSET64
#define _XOPEN_SOURCE 500
#include <blkid.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include "bcache.h"
int main(int argc, char **argv)
{
bool udev = false;
int i, o;
extern char *optarg;
struct cache_sb_disk sb_disk;
char uuid[40];
blkid_probe pr;
while ((o = getopt(argc, argv, "o:")) != EOF)
switch (o) {
case 'o':
if (strcmp("udev", optarg)) {
printf("Invalid output format %s\n", optarg);
exit(EXIT_FAILURE);
}
udev = true;
break;
}
argv += optind;
argc -= optind;
for (i = 0; i < argc; i++) {
int fd = open(argv[i], O_RDONLY);
if (fd == -1)
continue;
if (!(pr = blkid_new_probe()))
continue;
if (blkid_probe_set_device(pr, fd, 0, 0))
continue;
/* probe partitions too */
if (blkid_probe_enable_partitions(pr, true))
continue;
/* bail if anything was found
* probe-bcache isn't needed once blkid recognizes bcache */
if (!blkid_do_probe(pr)) {
continue;
}
if (pread(fd, &sb_disk, sizeof(sb_disk), SB_START) != sizeof(sb_disk))
continue;
if (memcmp(sb_disk.magic, bcache_magic, 16))
continue;
uuid_unparse(sb_disk.uuid, uuid);
if (udev)
printf("ID_FS_UUID=%s\n"
"ID_FS_UUID_ENC=%s\n"
"ID_FS_TYPE=bcache\n",
uuid, uuid);
else
printf("%s: UUID=\"\" TYPE=\"bcache\"\n", uuid);
}
return 0;
}
|
