add comment explaining mtree_traits

This commit is contained in:
Joe Thornber 2015-04-07 12:10:38 +01:00
parent cc44652cc3
commit f581f34be8

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@ -54,6 +54,9 @@ namespace thin_provisioning {
transaction_manager::ptr tm_;
};
// This value type is itself a tree containing mappings.
// Used when manipulating the top level of the mapping
// tree.
struct mtree_traits {
typedef base::le64 disk_type;
typedef uint64_t value_type;