tools/vgmerge.c

   1 /*
   2  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   3  * Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved.
   4  *
   5  * This file is part of LVM2.
   6  *
   7  * This copyrighted material is made available to anyone wishing to use,
   8  * modify, copy, or redistribute it subject to the terms and conditions
   9  * of the GNU Lesser General Public License v.2.1.
  10  *
  11  * You should have received a copy of the GNU Lesser General Public License
  12  * along with this program; if not, write to the Free Software Foundation,
  13  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  14  */
  15
  16 #include "tools.h"
  17
  18 static struct volume_group *_vgmerge_vg_read(struct cmd_context *cmd,
  19                                              const char *vg_name)
  20 {
  21         struct volume_group *vg;
  22         log_verbose("Checking for volume group \"%s\"", vg_name);
  23         vg = vg_read_for_update(cmd, vg_name, NULL, 0);
  24         if (vg_read_error(vg)) {
  25                 release_vg(vg);
  26                 return NULL;
  27         }
  28         return vg;
  29 }
  30
  31 static int _vgmerge_single(struct cmd_context *cmd, const char *vg_name_to,
  32                            const char *vg_name_from)
  33 {
  34         struct pv_list *pvl, *tpvl;
  35         struct volume_group *vg_to, *vg_from;
  36         struct lv_list *lvl1, *lvl2;
  37         int r = ECMD_FAILED;
  38         int lock_vg_from_first = 0;
  39
  40         if (!strcmp(vg_name_to, vg_name_from)) {
  41                 log_error("Duplicate volume group name \"%s\"", vg_name_from);
  42                 return ECMD_FAILED;
  43         }
  44
  45         if (strcmp(vg_name_to, vg_name_from) > 0)
  46                 lock_vg_from_first = 1;
  47
  48         if (lock_vg_from_first) {
  49                 vg_from = _vgmerge_vg_read(cmd, vg_name_from);
  50                 if (!vg_from) {
  51                         stack;
  52                         return ECMD_FAILED;
  53                 }
  54                 vg_to = _vgmerge_vg_read(cmd, vg_name_to);
  55                 if (!vg_to) {
  56                         stack;
  57                         unlock_and_release_vg(cmd, vg_from, vg_name_from);
  58                         return ECMD_FAILED;
  59                 }
  60         } else {
  61                 vg_to = _vgmerge_vg_read(cmd, vg_name_to);
  62                 if (!vg_to) {
  63                         stack;
  64                         return ECMD_FAILED;
  65                 }
  66
  67                 vg_from = _vgmerge_vg_read(cmd, vg_name_from);
  68                 if (!vg_from) {
  69                         stack;
  70                         unlock_and_release_vg(cmd, vg_to, vg_name_to);
  71                         return ECMD_FAILED;
  72                 }
  73         }
  74
  75         if (!vgs_are_compatible(cmd, vg_from, vg_to))
  76                 goto_bad;
  77
  78         /* FIXME List arg: vg_show_with_pv_and_lv(vg_to); */
  79
  80         if (!archive(vg_from) || !archive(vg_to))
  81                 goto_bad;
  82
  83         if (!drop_cached_metadata(vg_from))
  84                 stack;
  85
  86         /* Merge volume groups */
  87         dm_list_iterate_items_safe(pvl, tpvl, &vg_from->pvs) {
  88                 del_pvl_from_vgs(vg_from, pvl);
  89                 add_pvl_to_vgs(vg_to, pvl);
  90                 pvl->pv->vg_name = dm_pool_strdup(cmd->mem, vg_to->name);
  91         }
  92
  93         /* Fix up LVIDs */
  94         dm_list_iterate_items(lvl1, &vg_to->lvs) {
  95                 union lvid *lvid1 = &lvl1->lv->lvid;
  96                 char uuid[64] __attribute__((aligned(8)));
  97
  98                 dm_list_iterate_items(lvl2, &vg_from->lvs) {
  99                         union lvid *lvid2 = &lvl2->lv->lvid;
 100
 101                         if (id_equal(&lvid1->id[1], &lvid2->id[1])) {
 102                                 if (!id_create(&lvid2->id[1])) {
 103                                         log_error("Failed to generate new "
 104                                                   "random LVID for %s",
 105                                                   lvl2->lv->name);
 106                                         goto bad;
 107                                 }
 108                                 if (!id_write_format(&lvid2->id[1], uuid,
 109                                                      sizeof(uuid)))
 110                                         goto_bad;
 111
 112                                 log_verbose("Changed LVID for %s to %s",
 113                                             lvl2->lv->name, uuid);
 114                         }
 115                 }
 116         }
 117
 118         dm_list_iterate_items(lvl1, &vg_from->lvs) {
 119                 lvl1->lv->vg = vg_to;
 120         }
 121
 122         while (!dm_list_empty(&vg_from->lvs)) {
 123                 struct dm_list *lvh = vg_from->lvs.n;
 124
 125                 dm_list_move(&vg_to->lvs, lvh);
 126         }
 127
 128         while (!dm_list_empty(&vg_from->fid->metadata_areas_in_use)) {
 129                 struct dm_list *mdah = vg_from->fid->metadata_areas_in_use.n;
 130
 131                 dm_list_move(&vg_to->fid->metadata_areas_in_use, mdah);
 132         }
 133
 134         while (!dm_list_empty(&vg_from->fid->metadata_areas_ignored)) {
 135                 struct dm_list *mdah = vg_from->fid->metadata_areas_ignored.n;
 136
 137                 dm_list_move(&vg_to->fid->metadata_areas_ignored, mdah);
 138         }
 139
 140         vg_to->extent_count += vg_from->extent_count;
 141         vg_to->free_count += vg_from->free_count;
 142
 143         /* store it on disks */
 144         log_verbose("Writing out updated volume group");
 145         if (!vg_write(vg_to) || !vg_commit(vg_to))
 146                 goto_bad;
 147
 148         /* FIXME Remove /dev/vgfrom */
 149
 150         backup(vg_to);
 151         log_print("Volume group \"%s\" successfully merged into \"%s\"",
 152                   vg_from->name, vg_to->name);
 153         r = ECMD_PROCESSED;
 154 bad:
 155         /*
 156          * Note: as vg_to is referencing moved elements from vg_from
 157          * the order of release_vg calls is mandatory.
 158          */
 159         unlock_and_release_vg(cmd, vg_to, vg_name_to);
 160         unlock_and_release_vg(cmd, vg_from, vg_name_from);
 161
 162         return r;
 163 }
 164
 165 int vgmerge(struct cmd_context *cmd, int argc, char **argv)
 166 {
 167         const char *vg_name_to, *vg_name_from;
 168         int opt = 0;
 169         int ret = 0, ret_max = 0;
 170
 171         if (argc < 2) {
 172                 log_error("Please enter 2 or more volume groups to merge");
 173                 return EINVALID_CMD_LINE;
 174         }
 175
 176         vg_name_to = skip_dev_dir(cmd, argv[0], NULL);
 177         argc--;
 178         argv++;
 179
 180         for (; opt < argc; opt++) {
 181                 vg_name_from = skip_dev_dir(cmd, argv[opt], NULL);
 182
 183                 ret = _vgmerge_single(cmd, vg_name_to, vg_name_from);
 184                 if (ret > ret_max)
 185                         ret_max = ret;
 186         }
 187
 188         return ret_max;
 189 }