lib/swapprober.c

   1 /*
   2  * No copyright is claimed.  This code is in the public domain; do with
   3  * it what you wish.
   4  *
   5  * Written by Karel Zak <kzak@redhat.com>
   6  */
   7 #include "c.h"
   8 #include "nls.h"
   9
  10 #include "swapheader.h"
  11 #include "swapprober.h"
  12
  13 blkid_probe get_swap_prober(const char *devname)
  14 {
  15         blkid_probe pr;
  16         int rc;
  17         const char *version = NULL;
  18         char *swap_filter[] = { "swap", NULL };
  19
  20         pr = blkid_new_probe_from_filename(devname);
  21         if (!pr) {
  22                 warn(_("%s: unable to probe device"), devname);
  23                 return NULL;
  24         }
  25
  26         blkid_probe_enable_superblocks(pr, TRUE);
  27         blkid_probe_set_superblocks_flags(pr,
  28                         BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
  29                         BLKID_SUBLKS_VERSION);
  30
  31         blkid_probe_filter_superblocks_type(pr, BLKID_FLTR_ONLYIN, swap_filter);
  32
  33         rc = blkid_do_safeprobe(pr);
  34         if (rc == -1)
  35                 warn(_("%s: unable to probe device"), devname);
  36         else if (rc == -2)
  37                 warnx(_("%s: ambiguous probing result; use wipefs(8)"), devname);
  38         else if (rc == 1)
  39                 warnx(_("%s: not a valid swap partition"), devname);
  40
  41         if (rc == 0) {
  42                 /* Only the SWAPSPACE2 is supported. */
  43                 if (blkid_probe_lookup_value(pr, "VERSION", &version, NULL) == 0
  44                     && version
  45                     && strcmp(version, stringify_value(SWAP_VERSION)) != 0)
  46                         warnx(_("%s: unsupported swap version '%s'"),
  47                                                 devname, version);
  48                 else
  49                         return pr;
  50         }
  51
  52         blkid_free_probe(pr);
  53         return NULL;
  54 }