Re: [PATCH v3 3/3] btrfs: Introduce new incompat feature, BG_TREE, to speed up mount time

[Anand Jain]

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 044981cf6df9..1c5728e6a660 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1570,6 +1570,8 @@ struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info 
*fs_info,
        if (location->objectid == BTRFS_FREE_SPACE_TREE_OBJECTID)
                return fs_info->free_space_root ? fs_info->free_space_root :
                                                  ERR_PTR(-ENOENT);
+       if (location->objectid == BTRFS_BLOCK_GROUP_TREE_OBJECTID)

+               return fs_info->bg_root ? fs_info->bg_root: ERR_PTR(-ENOENT);

 An explicit check is better than implicit check for example:
------------
return btrfs_fs_incompat(fs_info, BG_TREE) ? \
        fs_info->bg_root : ERR_PTR(-ENOENT);
------------


Thanks, Anand