*/
/* /var/run/mdadm.map is used to track arrays being created in --incremental
- * more. It particularly allows lookup from UUID to array device, but
+ * mode. 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:
* 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.
+ * /var/run/mdadm/map /var/run/mdadm.map /lib/initrw/madam/map
+ * The last can easily be change at compile to e.g. somewhere in /dev.
* We read from the first one that exists and write to the first
* one that we can.
*/
-#include "mdadm.h"
+#include "mdadm.h"
+#include <sys/file.h>
+#include <ctype.h>
-#define mapnames(base) { #base, #base ".new", #base ".lock"}
+#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)
+ mapnames(VAR_RUN "/map"),
+ mapnames("/var/run/mdadm.map"),
+ mapnames(ALT_RUN "/" ALT_MAPFILE)
};
+char *mapdir[3] = { VAR_RUN, NULL, ALT_RUN };
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);
+ int fd;
+ if ((mapmode[modenum] & O_CREAT) &&
+ mapdir[modenum])
+ /* Attempt to create directory, don't worry about
+ * failure.
+ */
+ mkdir(mapdir[modenum], 0755);
+ fd = open(mapname[i][modenum], mapmode[modenum], 0600);
if (fd >= 0) {
*choice = i;
return fdopen(fd, mapsmode[modenum]);
lf = open_map(2, &lwhich);
if (lf == NULL)
return -1;
- if (lockf(fileno(lf), F_LOCK, 0) != 0) {
+ if (flock(fileno(lf), LOCK_EX) != 0) {
fclose(lf);
lf = NULL;
return -1;
void map_unlock(struct map_ent **melp)
{
- if (lf)
+ if (lf) {
+ flock(fileno(lf), LOCK_UN);
fclose(lf);
+ }
unlink(mapname[lwhich][2]);
lf = NULL;
}
}
}
+void map_remove(struct map_ent **mapp, int devnum)
+{
+ if (devnum == NoMdDev)
+ return;
+
+ map_delete(mapp, devnum);
+ map_write(*mapp);
+ map_free(*mapp);
+}
+
struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4])
{
struct map_ent *mp;
return NULL;
}
+/* sets the proper subarray and container_dev according to the metadata
+ * version super_by_fd does this automatically, this routine is meant as
+ * a supplement for guess_super()
+ */
+static void set_member_info(struct supertype *st, struct mdstat_ent *ent)
+{
+
+ st->subarray[0] = '\0';
+
+ if (ent->metadata_version == NULL ||
+ strncmp(ent->metadata_version, "external:", 9) != 0)
+ return;
+
+ if (is_subarray(&ent->metadata_version[9])) {
+ char version[strlen(ent->metadata_version)+1];
+ char *subarray;
+ char *name = &version[10];
+
+ strcpy(version, ent->metadata_version);
+ subarray = strrchr(version, '/');
+ name = &version[10];
+
+ if (!subarray)
+ return;
+ *subarray++ = '\0';
+
+ st->container_dev = devname2devnum(name);
+ strncpy(st->subarray, subarray, sizeof(st->subarray));
+ }
+}
+
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();
+ int require_homehost;
+ char sys_hostname[256];
+ char *homehost = conf_get_homehost(&require_homehost);
+
+ if (homehost == NULL || strcmp(homehost, "<system>")==0) {
+ if (gethostname(sys_hostname, sizeof(sys_hostname)) == 0) {
+ sys_hostname[sizeof(sys_hostname)-1] = 0;
+ homehost = sys_hostname;
+ }
+ }
for (md = mdstat ; md ; md = md->next) {
struct mdinfo *sra = sysfs_read(-1, md->devnum, GET_DEVS|SKIP_GONE_DEVS);
continue;
for (sd = sra->devs ; sd ; sd = sd->next) {
+ char namebuf[100];
char dn[30];
int dfd;
int ok;
st = guess_super(dfd);
if ( st == NULL)
ok = -1;
- else
+ else {
+ set_member_info(st, md);
ok = st->ss->load_super(st, dfd, NULL);
+ }
close(dfd);
if (ok != 0)
continue;
path = map_dev(MD_MAJOR, md->devnum, 0);
else
path = map_dev(mdp, (-1-md->devnum)<< 6, 0);
+ if (path == NULL ||
+ strncmp(path, "/dev/md/", 8) != 0) {
+ /* We would really like a name that provides
+ * an MD_DEVNAME for udev.
+ * The name needs to be unique both in /dev/md/
+ * and in this mapfile.
+ * It needs to match watch -I or -As would come
+ * up with.
+ * That means:
+ * Check if array is in mdadm.conf
+ * - if so use that.
+ * determine trustworthy from homehost etc
+ * find a unique name based on metadata name.
+ *
+ */
+ struct mddev_ident_s *match = conf_match(&info, st);
+ struct stat stb;
+ if (match && match->devname && match->devname[0] == '/') {
+ path = match->devname;
+ if (path[0] != '/') {
+ strcpy(namebuf, "/dev/md/");
+ strcat(namebuf, path);
+ path = namebuf;
+ }
+ } else {
+ int unum = 0;
+ char *sep = "_";
+ const char *name;
+ int conflict = 1;
+ if ((homehost == NULL ||
+ st->ss->match_home(st, homehost) != 1) &&
+ st->ss->match_home(st, "any") != 1 &&
+ (require_homehost
+ || ! conf_name_is_free(info.name)))
+ /* require a numeric suffix */
+ unum = 0;
+ else
+ /* allow name to be used as-is if no conflict */
+ unum = -1;
+ name = info.name;
+ if (!*name) {
+ name = st->ss->name;
+ if (!isdigit(name[strlen(name)-1]) &&
+ unum == -1) {
+ unum = 0;
+ sep = "";
+ }
+ }
+ if (strchr(name, ':'))
+ /* probably a uniquifying
+ * hostname prefix. Allow
+ * without a suffix
+ */
+ unum = -1;
+
+ while (conflict) {
+ if (unum >= 0)
+ sprintf(namebuf, "/dev/md/%s%s%d",
+ name, sep, unum);
+ else
+ sprintf(namebuf, "/dev/md/%s",
+ name);
+ unum++;
+ if (lstat(namebuf, &stb) != 0 &&
+ (map == NULL ||
+ !map_by_name(&map, namebuf+8)))
+ conflict = 0;
+ }
+ path = namebuf;
+ }
+ }
map_add(&map, md->devnum,
info.text_version,
info.uuid, path);
}
sysfs_free(sra);
}
- map_write(map);
+ /* Only trigger a change if we wrote a new map file */
+ if (map_write(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);
+ }
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