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Transactional file system

  • US 7,613,698 B2
  • Filed: 02/14/2005
  • Issued: 11/03/2009
  • Est. Priority Date: 03/30/2000
  • Status: Expired due to Term
First Claim
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1. 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.

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