RebuildMap: handle missing disks

[thirdparty/mdadm.git] / mapfile.c

diff --git a/mapfile.c b/mapfile.c
index 6169d5232e35d7b7d9e73f8eec7db21c48912ff6..f27623221ce9e706cec05d29d0140447bcc7e3fa 100644 (file)
--- a/mapfile.c
+++ b/mapfile.c
@@ -57,7 +57,9 @@ int map_write(struct map_ent *mel)
        }
        if (!f)
                return 0;
-       while (mel) {
+       for (; mel; mel = mel->next) {
+               if (mel->bad)
+                       continue;
                if (mel->devnum < 0)
                        fprintf(f, "mdp%d ", -1-mel->devnum);
                else
@@ -66,7 +68,6 @@ int map_write(struct map_ent *mel)
                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);
@@ -133,6 +134,7 @@ void map_add(struct map_ent **melp,
        memcpy(me->uuid, uuid, 16);
        me->path = strdup(path);
        me->next = *melp;
+       me->bad = 0;
        *melp = me;
 }
 
@@ -148,6 +150,12 @@ void map_read(struct map_ent **melp)
        *melp = NULL;
 
        f = fopen("/var/run/mdadm/map", "r");
+       if (!f)
+               f = fopen("/var/run/mdadm.map", "r");
+       if (!f) {
+               RebuildMap();
+               f = fopen("/var/run/mdadm/map", "r");
+       }
        if (!f)
                f = fopen("/var/run/mdadm.map", "r");
        if (!f)
@@ -228,9 +236,15 @@ struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4])
        if (!*map)
                map_read(map);
 
-       for (mp = *map ; mp ; mp = mp->next)
-               if (memcmp(uuid, mp->uuid, 16) == 0)
-                       return mp;
+       for (mp = *map ; mp ; mp = mp->next) {
+               if (memcmp(uuid, mp->uuid, 16) != 0)
+                       continue;
+               if (!mddev_busy(mp->devnum)) {
+                       mp->bad = 1;
+                       continue;
+               }
+               return mp;
+       }
        return NULL;
 }
 
@@ -240,9 +254,15 @@ struct map_ent *map_by_devnum(struct map_ent **map, int devnum)
        if (!*map)
                map_read(map);
 
-       for (mp = *map ; mp ; mp = mp->next)
-               if (mp->devnum == devnum)
-                       return mp;
+       for (mp = *map ; mp ; mp = mp->next) {
+               if (mp->devnum != devnum)
+                       continue;
+               if (!mddev_busy(mp->devnum)) {
+                       mp->bad = 1;
+                       continue;
+               }
+               return mp;
+       }
        return NULL;
 }
 
@@ -255,8 +275,70 @@ struct map_ent *map_by_name(struct map_ent **map, char *name)
        for (mp = *map ; mp ; mp = mp->next) {
                if (strncmp(mp->path, "/dev/md/", 8) != 0)
                        continue;
-               if (strcmp(mp->path+8, name) == 0)
-                       return mp;
+               if (strcmp(mp->path+8, name) != 0)
+                       continue;
+               if (!mddev_busy(mp->devnum)) {
+                       mp->bad = 1;
+                       continue;
+               }
+               return mp;
        }
        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 ? : "/unknown");
+                       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);
+}