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FS_TREE_OBJECTID

btrfs_uapi::subvolume

Constant FS_TREE_OBJECTID 

Source 
pub const FS_TREE_OBJECTID: u64 = _; // 5u64
Expand description

The top-level subvolume (FS tree); objectid 5, always present.

Returned by subvolume_default_get when no explicit default has been set.