mdadm: add the ability to change cluster name

[thirdparty/mdadm.git] / super1.c

diff --git a/super1.c b/super1.c
index a95c8d0cce9656658a097ce45e391dde00a77567..167f2cafd1cad9c6f9c46d69cf6cf937710ba6ab 100644 (file)
--- a/super1.c
+++ b/super1.c
@@ -256,6 +256,7 @@ static int awrite(struct align_fd *afd, void *buf, int len)
 static void examine_super1(struct supertype *st, char *homehost)
 {
        struct mdp_superblock_1 *sb = st->sb;
+       bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+MAX_SB_SIZE);
        time_t atime;
        unsigned int d;
        int role;
@@ -289,6 +290,8 @@ static void examine_super1(struct supertype *st, char *homehost)
            strncmp(sb->set_name, homehost, l) == 0)
                printf("  (local to host %s)", homehost);
        printf("\n");
+       if (bms->nodes > 0)
+               printf("Cluster Name : %s", bms->cluster_name);
        atime = __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL;
        printf("  Creation Time : %.24s\n", ctime(&atime));
        c=map_num(pers, __le32_to_cpu(sb->level));
@@ -740,6 +743,7 @@ err:
 static void detail_super1(struct supertype *st, char *homehost)
 {
        struct mdp_superblock_1 *sb = st->sb;
+       bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MAX_SB_SIZE);
        int i;
        int l = homehost ? strlen(homehost) : 0;
 
@@ -748,6 +752,8 @@ static void detail_super1(struct supertype *st, char *homehost)
            sb->set_name[l] == ':' &&
            strncmp(sb->set_name, homehost, l) == 0)
                printf("  (local to host %s)", homehost);
+       if (bms->nodes > 0)
+           printf("Cluster Name : %64s", bms->cluster_name);
        printf("\n           UUID : ");
        for (i=0; i<16; i++) {
                if ((i&3)==0 && i != 0) printf(":");
@@ -1691,7 +1697,7 @@ static int write_init_super1(struct supertype *st)
                sb->sb_csum = calc_sb_1_csum(sb);
                rv = store_super1(st, di->fd);
                if (rv == 0 && (__le32_to_cpu(sb->feature_map) & 1))
-                       rv = st->ss->write_bitmap(st, di->fd);
+                       rv = st->ss->write_bitmap(st, di->fd, NoUpdate);
                close(di->fd);
                di->fd = -1;
                if (rv)
@@ -2175,7 +2181,7 @@ static void locate_bitmap1(struct supertype *st, int fd)
        lseek64(fd, offset<<9, 0);
 }
 
-static int write_bitmap1(struct supertype *st, int fd)
+static int write_bitmap1(struct supertype *st, int fd, enum bitmap_update update)
 {
        struct mdp_superblock_1 *sb = st->sb;
        bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb)+MAX_SB_SIZE);
@@ -2185,6 +2191,19 @@ static int write_bitmap1(struct supertype *st, int fd)
        struct align_fd afd;
        unsigned int i = 0;
 
+       switch (update) {
+       case NameUpdate:
+               /* update cluster name */
+               if (st->cluster_name) {
+                       memset((char *)bms->cluster_name, 0, sizeof(bms->cluster_name));
+                       strncpy((char *)bms->cluster_name, st->cluster_name, 64);
+               }
+               break;
+       case NoUpdate:
+       default:
+               break;
+       }
+
        init_afd(&afd, fd);
 
        locate_bitmap1(st, fd);