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* mapfile - manage /var/run/mdadm.map. Part of:
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* mdadm - manage Linux "md" devices aka RAID arrays.
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* Copyright (C) 2006 Neil Brown <neilb@suse.de>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* Email: <neilb@suse.de>
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* QVB Post Office, NSW 1230
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/* /var/run/mdadm.map is used to track arrays being created in --incremental
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* more. It particularly allows lookup from UUID to array device, but
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* also allows the array device name to be easily found.
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* The map file is line based with space separated fields. The fields are:
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* Device id - mdX or mdpX where is a number.
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* metadata - 0.90 1.0 1.1 1.2
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* UUID - uuid of the array
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* path - path where device created: /dev/md/home
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int map_write(struct map_ent *mel)
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f = fopen("/var/run/mdadm/map.new", "w");
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f = fopen("/var/run/mdadm.map.new", "w");
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fprintf(f, "mdp%d ", -1-mel->devnum);
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fprintf(f, "md%d ", mel->devnum);
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fprintf(f, "%d.%d ", mel->major, mel->minor);
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fprintf(f, "%08x:%08x:%08x:%08x ", mel->uuid[0],
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mel->uuid[1], mel->uuid[2], mel->uuid[3]);
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fprintf(f, "%s\n", mel->path);
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unlink("/var/run/mdadm/map.new");
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unlink("/var/run/mdadm.map.new");
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return rename("/var/run/mdadm/map.new",
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"/var/run/mdadm/map") == 0;
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return rename("/var/run/mdadm.map.new",
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"/var/run/mdadm.map") == 0;
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void map_add(struct map_ent **melp,
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int devnum, int major, int minor, int uuid[4], char *path)
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struct map_ent *me = malloc(sizeof(*me));
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memcpy(me->uuid, uuid, 16);
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me->path = strdup(path);
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void map_read(struct map_ent **melp)
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int devnum, major, minor, uuid[4];
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f = fopen("/var/run/mdadm/map", "r");
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f = fopen("/var/run/mdadm.map", "r");
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while (fgets(buf, sizeof(buf), f)) {
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if (sscanf(buf, " md%1[p]%d %d.%d %x:%x:%x:%x %200s",
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nam, &devnum, &major, &minor, uuid, uuid+1,
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uuid+2, uuid+3, path) == 9) {
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devnum = -1 - devnum;
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map_add(melp, devnum, major, minor, uuid, path);
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void map_free(struct map_ent *map)
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struct map_ent *mp = map;
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int map_update(struct map_ent **mpp, int devnum, int major, int minor,
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int *uuid, char *path)
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struct map_ent *map, *mp;
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for (mp = map ; mp ; mp=mp->next)
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if (mp->devnum == devnum) {
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memcpy(mp->uuid, uuid, 16);
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mp->path = strdup(path);
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map_add(&map, devnum, major, minor, uuid, path);
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void map_delete(struct map_ent **mapp, int devnum)
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for (mp = *mapp; mp; mp = *mapp) {
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if (mp->devnum == devnum) {
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struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4])
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for (mp = *map ; mp ; mp = mp->next)
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if (memcmp(uuid, mp->uuid, 16) == 0)