1 files changed, 5 insertions, 2 deletions

diff --git a/fs/btrfs/mkfs.c b/fs/btrfs/mkfs.c
index bab98c6d6fa7..584aba44e801 100644
--- a/fs/btrfs/mkfs.c
+++ b/fs/btrfs/mkfs.c
@@ -18,12 +18,13 @@ int mkfs(int fd)
         struct extent_item extent_item;
         int ret;
 
+        /* setup the super block area */
         memset(info, 0, sizeof(info));
         info[0].blocknr = 16;
         info[0].objectid = 1;
         info[0].tree_root = 17;
         info[0].alloc_extent.blocknr = 0;
-        info[0].alloc_extent.num_blocks = 20;
+        info[0].alloc_extent.num_blocks = 64;
         /* 0-17 are used (inclusive) */
         info[0].alloc_extent.num_used = 18;
 
@@ -31,12 +32,14 @@ int mkfs(int fd)
         info[1].objectid = 2;
         info[1].tree_root = 64;
         info[1].alloc_extent.blocknr = 64;
-        info[1].alloc_extent.num_blocks = 8;
+        info[1].alloc_extent.num_blocks = 64;
         info[1].alloc_extent.num_used = 1;
         ret = pwrite(fd, info, sizeof(info),
                      CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
         if (ret != sizeof(info))
                 return -1;
+
+        /* create leaves for the tree root and extent root */
         memset(&empty_leaf, 0, sizeof(empty_leaf));
         empty_leaf.header.parentid = 1;
         empty_leaf.header.blocknr = 17;