git.sesse.net Git - bcachefs-tools-debian/blob - probe-bcache.c

   1 #define _FILE_OFFSET_BITS       64
   2 #define __USE_FILE_OFFSET64
   3 #define _XOPEN_SOURCE 500
   4
   5 #include <fcntl.h>
   6 #include <linux/fs.h>
   7 #include <stdbool.h>
   8 #include <stdint.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <sys/ioctl.h>
  13 #include <sys/types.h>
  14 #include <sys/stat.h>
  15 #include <unistd.h>
  16 #include <uuid/uuid.h>
  17
  18 #include "bcache.h"
  19
  20 int main(int argc, char **argv)
  21 {
  22         bool udev = false;
  23         int i, o;
  24         extern char *optarg;
  25         struct cache_sb sb;
  26         char uuid[40];
  27
  28         while ((o = getopt(argc, argv, "o:")) != EOF)
  29                 switch (o) {
  30                 case 'o':
  31                         if (strcmp("udev", optarg)) {
  32                                 printf("Invalid output format %s\n", optarg);
  33                                 exit(EXIT_FAILURE);
  34                         }
  35                         udev = true;
  36                         break;
  37                 }
  38
  39
  40         argv += optind;
  41         argc -= optind;
  42
  43         for (i = 0; i < argc; i++) {
  44                 int fd = open(argv[i], O_RDONLY);
  45                 if (fd == -1)
  46                         continue;
  47
  48
  49                 if (pread(fd, &sb, sizeof(sb), 4096) != sizeof(sb))
  50                         continue;
  51
  52                 if (memcmp(sb.magic, bcache_magic, 16))
  53                         continue;
  54
  55                 uuid_unparse(sb.uuid, uuid);
  56
  57                 if (udev)
  58                         printf("ID_FS_UUID=%s\n"
  59                                "ID_FS_UUID_ENC=%s\n"
  60                                "ID_FS_TYPE=bcache\n",
  61                                uuid, uuid);
  62                 else
  63                         printf("%s: UUID=\"\" TYPE=\"bcache\"\n", uuid);
  64         }
  65
  66         return 0;
  67 }