enabled by default.
data_flush Enable data flushing before checkpoint in order to
persist data of regular and symlink.
+reserve_root=%d Support configuring reserved space which is used for
+ allocation from a privileged user with specified uid or
+ gid, unit: 4KB, the default limit is 0.2% of user blocks.
+resuid=%d The user ID which may use the reserved blocks.
+resgid=%d The group ID which may use the reserved blocks.
fault_injection=%d Enable fault injection in all supported types with
specified injection rate.
fault_type=%d Support configuring fault injection type, should be