* mapfile - manage /var/run/mdadm.map. Part of:
* mdadm - manage Linux "md" devices aka RAID arrays.
*
- * Copyright (C) 2006 Neil Brown <neilb@suse.de>
+ * Copyright (C) 2006-2009 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
* UUID - uuid of the array
* path - path where device created: /dev/md/home
*
+ * The preferred location for the map file is /var/run/mdadm.map.
+ * However /var/run may not exist or be writable in early boot. And if
+ * no-one has created /var/run/mdadm, we still want to survive.
+ * So possible locations are:
+ * /var/run/mdadm/map /var/run/mdadm.map /dev/.mdadm.map
+ * the last, because udev requires a writable /dev very early.
+ * We read from the first one that exists and write to the first
+ * one that we can.
*/
+#include "mdadm.h"
+#define mapnames(base) { #base, #base ".new", #base ".lock"}
+char *mapname[3][3] = {
+ mapnames(/var/run/mdadm/map),
+ mapnames(/var/run/mdadm.map),
+ mapnames(/dev/.mdadm.map)
+};
-#include "mdadm.h"
+int mapmode[3] = { O_RDONLY, O_RDWR|O_CREAT, O_RDWR|O_CREAT | O_TRUNC };
+char *mapsmode[3] = { "r", "w", "w"};
+FILE *open_map(int modenum, int *choice)
+{
+ int i;
+ for (i = 0 ; i < 3 ; i++) {
+ int fd = open(mapname[i][modenum], mapmode[modenum], 0600);
+ if (fd >= 0) {
+ *choice = i;
+ return fdopen(fd, mapsmode[modenum]);
+ }
+ }
+ return NULL;
+}
int map_write(struct map_ent *mel)
{
FILE *f;
int err;
- int subdir = 1;
+ int which;
+
+ f = open_map(1, &which);
- f = fopen("/var/run/mdadm/map.new", "w");
- if (!f) {
- f = fopen("/var/run/mdadm.map.new", "w");
- subdir = 0;
- }
if (!f)
return 0;
for (; mel; mel = mel->next) {
fprintf(f, "%s ", mel->metadata);
fprintf(f, "%08x:%08x:%08x:%08x ", mel->uuid[0],
mel->uuid[1], mel->uuid[2], mel->uuid[3]);
- fprintf(f, "%s\n", mel->path);
+ fprintf(f, "%s\n", mel->path?:"");
}
fflush(f);
err = ferror(f);
fclose(f);
if (err) {
- if (subdir)
- unlink("/var/run/mdadm/map.new");
- else
- unlink("/var/run/mdadm.map.new");
+ unlink(mapname[which][1]);
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;
+ return rename(mapname[which][1],
+ mapname[which][0]) == 0;
}
-static int lfd = -1;
-static int lsubdir = 0;
+static FILE *lf = NULL;
+static int lwhich = 0;
int map_lock(struct map_ent **melp)
{
- if (lfd < 0) {
- lfd = open("/var/run/mdadm/map.lock", O_CREAT|O_RDWR, 0600);
- if (lfd < 0) {
- lfd = open("/var/run/mdadm.map.lock", O_CREAT|O_RDWR, 0600);
- lsubdir = 0;
- } else
- lsubdir = 1;
- if (lfd < 0)
+ if (lf == NULL) {
+ lf = open_map(2, &lwhich);
+ if (lf == NULL)
return -1;
- if (lockf(lfd, F_LOCK, 0) != 0) {
- close(lfd);
- lfd = -1;
+ if (lockf(fileno(lf), F_LOCK, 0) != 0) {
+ fclose(lf);
+ lf = NULL;
return -1;
}
}
void map_unlock(struct map_ent **melp)
{
- if (lfd >= 0)
- close(lfd);
- if (lsubdir)
- unlink("/var/run/mdadm/map.lock");
- else
- unlink("/var/run/mdadm.map.lock");
- lfd = -1;
+ if (lf)
+ fclose(lf);
+ unlink(mapname[lwhich][2]);
+ lf = NULL;
}
void map_add(struct map_ent **melp,
me->devnum = devnum;
strcpy(me->metadata, metadata);
memcpy(me->uuid, uuid, 16);
- me->path = strdup(path);
+ me->path = path ? strdup(path) : NULL;
me->next = *melp;
me->bad = 0;
*melp = me;
int devnum, uuid[4];
char metadata[30];
char nam[4];
+ int which;
*melp = NULL;
- f = fopen("/var/run/mdadm/map", "r");
- if (!f)
- f = fopen("/var/run/mdadm.map", "r");
+ f = open_map(0, &which);
+ if (!f) {
+ RebuildMap();
+ f = open_map(0, &which);
+ }
if (!f)
return;
while (fgets(buf, sizeof(buf), f)) {
+ path[0] = 0;
if (sscanf(buf, " %3[mdp]%d %s %x:%x:%x:%x %200s",
nam, &devnum, metadata, uuid, uuid+1,
- uuid+2, uuid+3, path) == 8) {
+ uuid+2, uuid+3, path) >= 7) {
if (strncmp(nam, "md", 2) != 0)
continue;
if (nam[2] == 'p')
strcpy(mp->metadata, metadata);
memcpy(mp->uuid, uuid, 16);
free(mp->path);
- mp->path = strdup(path);
+ mp->path = path ? strdup(path) : NULL;
break;
}
if (!mp)
map_read(map);
for (mp = *map ; mp ; mp = mp->next) {
+ if (!mp->path)
+ continue;
if (strncmp(mp->path, "/dev/md/", 8) != 0)
continue;
if (strcmp(mp->path+8, name) != 0)
}
return NULL;
}
+
+void RebuildMap(void)
+{
+ struct mdstat_ent *mdstat = mdstat_read(0, 0);
+ struct mdstat_ent *md;
+ struct map_ent *map = NULL;
+ int mdp = get_mdp_major();
+
+ for (md = mdstat ; md ; md = md->next) {
+ struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS|SKIP_GONE_DEVS);
+ struct mdinfo *sd;
+
+ if (!sra)
+ continue;
+
+ for (sd = sra->devs ; sd ; sd = sd->next) {
+ char dn[30];
+ int dfd;
+ int ok;
+ struct supertype *st;
+ char *path;
+ struct mdinfo info;
+
+ sprintf(dn, "%d:%d", sd->disk.major, sd->disk.minor);
+ dfd = dev_open(dn, O_RDONLY);
+ if (dfd < 0)
+ continue;
+ st = guess_super(dfd);
+ if ( st == NULL)
+ ok = -1;
+ else
+ ok = st->ss->load_super(st, dfd, NULL);
+ close(dfd);
+ if (ok != 0)
+ continue;
+ st->ss->getinfo_super(st, &info);
+ if (md->devnum >= 0)
+ path = map_dev(MD_MAJOR, md->devnum, 0);
+ else
+ path = map_dev(mdp, (-1-md->devnum)<< 6, 0);
+ map_add(&map, md->devnum,
+ info.text_version,
+ info.uuid, path);
+ st->ss->free_super(st);
+ break;
+ }
+ sysfs_free(sra);
+ }
+ map_write(map);
+ map_free(map);
+ for (md = mdstat ; md ; md = md->next) {
+ struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_VERSION);
+ sysfs_uevent(sra, "change");
+ sysfs_free(sra);
+ }
+ free_mdstat(mdstat);
+}
projects / thirdparty / mdadm.git / blobdiff