lib/swapprober.c

   1
   2 #include "c.h"
   3 #include "nls.h"
   4
   5 #include "swapheader.h"
   6 #include "swapprober.h"
   7
   8 blkid_probe get_swap_prober(const char *devname)
   9 {
  10         blkid_probe pr;
  11         int rc;
  12         const char *version = NULL;
  13         char *swap_filter[] = { "swap", NULL };
  14
  15         pr = blkid_new_probe_from_filename(devname);
  16         if (!pr) {
  17                 warn(_("%s: unable to probe device"), devname);
  18                 return NULL;
  19         }
  20
  21         blkid_probe_enable_superblocks(pr, TRUE);
  22         blkid_probe_set_superblocks_flags(pr,
  23                         BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
  24                         BLKID_SUBLKS_VERSION);
  25
  26         blkid_probe_filter_superblocks_type(pr, BLKID_FLTR_ONLYIN, swap_filter);
  27
  28         rc = blkid_do_safeprobe(pr);
  29         if (rc == -1)
  30                 warn(_("%s: unable to probe device"), devname);
  31         else if (rc == -2)
  32                 warnx(_("%s: ambiguous probing result; use wipefs(8)"), devname);
  33         else if (rc == 1)
  34                 warnx(_("%s: not a valid swap partition"), devname);
  35
  36         if (rc == 0) {
  37                 /* Only the SWAPSPACE2 is supported. */
  38                 if (blkid_probe_lookup_value(pr, "VERSION", &version, NULL) == 0
  39                     && version
  40                     && strcmp(version, stringify_value(SWAP_VERSION)))
  41                         warnx(_("%s: unsupported swap version '%s'"),
  42                                                 devname, version);
  43                 else
  44                         return pr;
  45         }
  46
  47         blkid_free_probe(pr);
  48         return NULL;
  49 }