btrfs-progs: make sure btrfs-zero-log writes something

The close_ctree code does a check to see if the FS has
changed before it does any IO.  This forces the commit.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/btrfs-zero-log.c b/btrfs-zero-log.c
index 54d7858..1ea867b 100644 (file)
--- a/btrfs-zero-log.c
+++ b/btrfs-zero-log.c
@@ -42,6 +42,7 @@ static void print_usage(void)
 int main(int ac, char **av)
 {
        struct btrfs_root *root;
+       struct btrfs_trans_handle *trans;
        int ret;
 
        if (ac != 2)
@@ -62,8 +63,10 @@ int main(int ac, char **av)
        if (root == NULL)
                return 1;
 
+       trans = btrfs_start_transaction(root, 1);
        btrfs_set_super_log_root(&root->fs_info->super_copy, 0);
        btrfs_set_super_log_root_level(&root->fs_info->super_copy, 0);
+       btrfs_commit_transaction(trans, root);
        close_ctree(root);
        return ret;
 }