Transactional file system

In a computing environment, a system comprising:

• a processor;
• and
• a computer-readable storage medium having stored thereon a plurality of service modules executable by the processor, the plurality of service modules including:
• a multiple-level logging service, the multi-level logging service module including:
• a lower-level file system logging mechanism for logging, in a first log, low level operations corresponding to a first file;
• and
• a higher-level transactional file system logging mechanism for logging, in a second log, higher level information, the higher-level transactional file system logging mechanism treating the low level information of the first log as data for the second log;
• and
• a decision-making service module for determining whether higher-level logged operations actually occurred, wherein the decision-making service module is adapted to determine that lower-level logged operations have successfully committed, wherein lower-level logged operations commit subsequent to successfully committing a related higher-level logged operation, and wherein determining that lower-level logged operations have successfully committed necessarily indicates to the decision-making service module that previous higher-level logged operations actually occurred;
• and
• wherein the second log contains a first log sequence number identifying the higher-level operation associated with the log entry and wherein the first file has an associated second log sequence number identifying the last committed higher-level operation;
• and
• wherein the first log sequence number being less than or equal to the second log sequence necessarily indicates that the higher-level operation associated with the first log sequence number occurred prior to the low level operation being committed.