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/*
* mapfile - manage /var/run/mdadm.map. Part of:
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2006 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Neil Brown
* Email: <neilb@suse.de>
* Paper: Neil Brown
* Novell Inc
* GPO Box Q1283
* QVB Post Office, NSW 1230
* Australia
*/
/* /var/run/mdadm.map is used to track arrays being created in --incremental
* more. It particularly allows lookup from UUID to array device, but
* also allows the array device name to be easily found.
*
* The map file is line based with space separated fields. The fields are:
* Device id - mdX or mdpX where is a number.
* metadata - 0.90 1.0 1.1 1.2
* UUID - uuid of the array
* path - path where device created: /dev/md/home
*
*/
#include "mdadm.h"
int map_write(struct map_ent *mel)
{
FILE *f;
int err;
int subdir = 1;
f = fopen("/var/run/mdadm/map.new", "w");
if (!f) {
f = fopen("/var/run/mdadm.map.new", "w");
subdir = 1;
}
if (!f)
return 0;
while (mel) {
if (mel->devnum < 0)
fprintf(f, "mdp%d ", -1-mel->devnum);
else
fprintf(f, "md%d ", mel->devnum);
fprintf(f, "%d.%d ", mel->major, mel->minor);
fprintf(f, "%08x:%08x:%08x:%08x ", mel->uuid[0],
mel->uuid[1], mel->uuid[2], mel->uuid[3]);
fprintf(f, "%s\n", mel->path);
mel = mel->next;
}
fflush(f);
err = ferror(f);
fclose(f);
if (err) {
if (subdir)
unlink("/var/run/mdadm/map.new");
else
unlink("/var/run/mdadm.map.new");
return 0;
}
if (subdir)
return rename("/var/run/mdadm/map.new",
"/var/run/mdadm/map") == 0;
else
return rename("/var/run/mdadm.map.new",
"/var/run/mdadm.map") == 0;
}
void map_add(struct map_ent **melp,
int devnum, int major, int minor, int uuid[4], char *path)
{
struct map_ent *me = malloc(sizeof(*me));
me->devnum = devnum;
me->major = major;
me->minor = minor;
memcpy(me->uuid, uuid, 16);
me->path = strdup(path);
me->next = *melp;
*melp = me;
}
void map_read(struct map_ent **melp)
{
FILE *f;
char buf[8192];
char path[200];
int devnum, major, minor, uuid[4];
char nam[4];
*melp = NULL;
f = fopen("/var/run/mdadm/map", "r");
if (!f)
f = fopen("/var/run/mdadm.map", "r");
if (!f)
return;
while (fgets(buf, sizeof(buf), f)) {
if (sscanf(buf, " md%1[p]%d %d.%d %x:%x:%x:%x %200s",
nam, &devnum, &major, &minor, uuid, uuid+1,
uuid+2, uuid+3, path) == 9) {
if (nam[0] == 'p')
devnum = -1 - devnum;
map_add(melp, devnum, major, minor, uuid, path);
}
}
fclose(f);
}
void map_free(struct map_ent *map)
{
while (map) {
struct map_ent *mp = map;
map = mp->next;
free(mp->path);
free(mp);
}
}
int map_update(struct map_ent **mpp, int devnum, int major, int minor,
int *uuid, char *path)
{
struct map_ent *map, *mp;
int rv;
if (mpp && *mpp)
map = *mpp;
else
map_read(&map);
for (mp = map ; mp ; mp=mp->next)
if (mp->devnum == devnum) {
mp->major = major;
mp->minor = minor;
memcpy(mp->uuid, uuid, 16);
free(mp->path);
mp->path = strdup(path);
break;
}
if (!mp)
map_add(&map, devnum, major, minor, uuid, path);
*mpp = NULL;
rv = map_write(map);
map_free(map);
return rv;
}
void map_delete(struct map_ent **mapp, int devnum)
{
struct map_ent *mp;
if (*mapp == NULL)
map_read(mapp);
for (mp = *mapp; mp; mp = *mapp) {
if (mp->devnum == devnum) {
*mapp = mp->next;
free(mp->path);
free(mp);
} else
mapp = & mp->next;
}
}
struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4])
{
struct map_ent *mp;
if (!*map)
map_read(map);
for (mp = *map ; mp ; mp = mp->next)
if (memcmp(uuid, mp->uuid, 16) == 0)
return mp;
return NULL;
}
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