Prefer version-1 superblocks for v.large devices.

[thirdparty/mdadm.git] / Create.c

diff --git a/Create.c b/Create.c
index 7fbf9c02f08307c33cfd3acee7e86af569006605..71bab18b7f414b10810fb5ed1cb30758c05b4f94 100644 (file)
--- a/Create.c
+++ b/Create.c
@@ -214,6 +214,27 @@ int Create(struct supertype *st, char *mddev, int mdfd,
                        ldsize = dsize;
                        ldsize <<= 9;
                }
+               if (st == NULL) {
+                       /* Need to choose a default metadata, which is different
+                        * depending on the sizes of devices
+                        */
+                       int i;
+                       char *name = "default";
+                       if (level >= 1 && ldsize > (0x7fffffffULL<<10))
+                               name = "default/large";
+                       for(i=0; !st && superlist[i]; i++)
+                               st = superlist[i]->match_metadata_desc(name);
+
+                       if (!st) {
+                               fprintf(stderr, Name ": internal error - no default metadata style\n");
+                               exit(2);
+                       }
+                       if (st->ss->major != 0 ||
+                           st->minor_version != 90)
+                               fprintf(stderr, Name ": Defaulting to verion %d.%d metadata\n",
+                                       st->ss->major,
+                                       st->minor_version);
+               }
                freesize = st->ss->avail_size(st, ldsize >> 9);
                if (freesize == 0) {
                        fprintf(stderr, Name ": %s is too small: %luK\n",