device-mapper-dmsetup-export.patch

   1 diff -ur LVM2.2.03.02.orig/libdm/dm-tools/dmsetup.c LVM2.2.03.02/libdm/dm-tools/dmsetup.c
   2 --- LVM2.2.03.02.orig/libdm/dm-tools/dmsetup.c  2019-03-22 16:55:55.393000000 +0100
   3 +++ LVM2.2.03.02/libdm/dm-tools/dmsetup.c       2019-03-22 17:00:55.046000000 +0100
   4 @@ -2551,6 +2551,93 @@
   5         return r;
   6  }
   7
   8 +static int _export(CMD_ARGS)
   9 +{
  10 +       int r = 0;
  11 +       struct dm_task *dmt = NULL;
  12 +       void *next = NULL;
  13 +       uint64_t start, length;
  14 +       char *target_type = NULL;
  15 +       char *params;
  16 +       const char *name = NULL;
  17 +       const char *uuid = NULL;
  18 +       struct dm_info info;
  19 +
  20 +       if (names)
  21 +               name = names->name;
  22 +       else if (argc == 2)
  23 +               name = argv[1];
  24 +
  25 +       if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
  26 +               goto out;
  27 +
  28 +       if (!_set_task_device(dmt, name, 0))
  29 +               goto out;
  30 +
  31 +       if (!dm_task_run(dmt))
  32 +               goto out;
  33 +
  34 +       if (!dm_task_get_info(dmt, &info) || !info.exists)
  35 +               goto out;
  36 +
  37 +       if (!name)
  38 +               name = dm_task_get_name(dmt);
  39 +
  40 +       uuid = dm_task_get_uuid(dmt);
  41 +       printf("DM_NAME=%s\n", name);
  42 +
  43 +       if ((uuid = dm_task_get_uuid(dmt)) && *uuid)
  44 +               printf("DM_UUID=%s\n", uuid);
  45 +
  46 +       if (!info.exists) {
  47 +               printf("DM_STATE=NOTPRESENT\n");
  48 +               goto out;
  49 +       }
  50 +
  51 +       printf("DM_STATE=%s\n",
  52 +              info.suspended ? "SUSPENDED" :
  53 +              (info.read_only ? "READONLY" : "ACTIVE"));
  54 +
  55 +       if (!info.live_table && !info.inactive_table)
  56 +               printf("DM_TABLE_STATE=NONE\n");
  57 +       else
  58 +               printf("DM_TABLE_STATE=%s%s%s\n",
  59 +                      info.live_table ? "LIVE" : "",
  60 +                      info.live_table && info.inactive_table ? "/" : "",
  61 +                      info.inactive_table ? "INACTIVE" : "");
  62 +
  63 +       if (info.open_count != -1)
  64 +               printf("DM_OPENCOUNT=%d\n", info.open_count);
  65 +
  66 +       printf("DM_LAST_EVENT_NR=%" PRIu32 "\n", info.event_nr);
  67 +
  68 +       printf("DM_MAJOR=%d\n", info.major);
  69 +       printf("DM_MINOR=%d\n", info.minor);
  70 +
  71 +       if (info.target_count != -1)
  72 +               printf("DM_TARGET_COUNT=%d\n", info.target_count);
  73 +
  74 +       /* export all table types */
  75 +       next = dm_get_next_target(dmt, next, &start, &length,
  76 +                                 &target_type, &params);
  77 +       if (target_type) {
  78 +               printf("DM_TARGET_TYPES=%s", target_type);
  79 +               while (next) {
  80 +                       next = dm_get_next_target(dmt, next, &start, &length,
  81 +                                                 &target_type, &params);
  82 +                       if (target_type)
  83 +                               printf(",%s", target_type);
  84 +               }
  85 +               printf("\n");
  86 +       }
  87 +
  88 +       r = 1;
  89 +      out:
  90 +       if (dmt)
  91 +               dm_task_destroy(dmt);
  92 +       return r;
  93 +}
  94 +
  95  /* Show target names and their version numbers */
  96  static int _targets(CMD_ARGS)
  97  {
  98 @@ -6230,6 +6317,7 @@
  99         {"stats", "<command> [<options>] [<device>...]", 1, -1, 1, 1, _stats},
 100         {"status", "[<device>...] [--noflush] [--target <target_type>]", 0, -1, 2, 0, _status},
 101         {"table", "[<device>...] [--concise] [--target <target_type>] [--showkeys]", 0, -1, 2, 0, _status},
 102 +       {"export", "[<device>]", 0, 1, 1, 0, _export},
 103         {"wait", "<device> [<event_nr>] [--noflush]", 0, 2, 0, 0, _wait},
 104         {"mknodes", "[<device>...]", 0, -1, 1, 0, _mknodes},
 105         {"mangle", "[<device>...]", 0, -1, 1, 0, _mangle},
 106 diff -ur LVM2.2.03.02.orig/man/dmsetup.8_main LVM2.2.03.02/man/dmsetup.8_main
 107 --- LVM2.2.03.02.orig/man/dmsetup.8_main        2019-03-22 16:55:55.394000000 +0100
 108 +++ LVM2.2.03.02/man/dmsetup.8_main     2019-03-22 17:00:55.047000000 +0100
 109 @@ -59,6 +59,14 @@
 110  .
 111  .HP
 112  .B dmsetup
 113 +.de CMD_EXPORT
 114 +.  BR export
 115 +.  RI [ device_name ]
 116 +..
 117 +.CMD_EXPORT
 118 +.
 119 +.HP
 120 +.B dmsetup
 121  .de CMD_HELP
 122  .  BR help
 123  .  RB [ -c | -C | --columns ]
 124 @@ -651,6 +659,9 @@
 125  \fBdevname\fP (map name for device-mapper devices, equal to blkdevname otherwise).
 126  .
 127  .HP
 128 +.CMD_EXPORT
 129 +Outputs information in key/value format to be imported by other programs.
 130 +.HP
 131  .CMD_HELP
 132  .br
 133  Outputs a summary of the commands available, optionally including