Incremental File System Check via Changed Inode Logging

Solution Overview

Problem

Existing file systems face inefficiencies in maintaining data integrity due to the time-consuming and resource-intensive process of fully checking metadata consistency, which can lead to data loss and corruption.

Innovation Solution

Implementing incremental file system checks by identifying changed metadata since the last check, creating an updated log, and verifying its consistency, allowing for more frequent checks without increasing time and resource costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a full file system check is performed to validate metadata consistency, then data integrity is ensured, but the time required and computing resources consumed increase substantially

Engineering Contradiction:

Improvedata integrityVSAvoidtime required for check

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent divides the file system metadata into segments (inodes, directories, blocks) and tracks changes to each segment since the last check. Instead of checking the entire file system, only the changed segments are validated, reducing the time and resources required while maintaining integrity assurance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system performs preliminary actions by maintaining a log of changed inodes and metadata since the last check. This log is created and updated continuously during normal file system operations, so that when a check is needed, the preliminary change tracking is already in place, enabling rapid incremental validation without requiring a full re-scan.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If a full file system check is performed to validate metadata consistency, then data integrity is ensured, but computing resources consumed increase substantially

Engineering Contradiction:

Improvedata integrityVSAvoidcomputing resources consumed

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent divides the file system metadata into segments (inodes, directories, blocks) and tracks changes to each segment since the last check. Instead of checking the entire file system, only the changed segments are validated, reducing the time and resources required while maintaining integrity assurance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system performs preliminary actions by maintaining a log of changed inodes and metadata since the last check. This log is created and updated continuously during normal file system operations, so that when a check is needed, the preliminary change tracking is already in place, enabling rapid incremental validation without requiring a full re-scan.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If file system checks are performed frequently to prevent corruption, then data integrity is maintained, but the time and resources required for each check increase

Engineering Contradiction:

Improvedata integrityVSAvoidcheck frequency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements dynamic checking by adjusting the scope of the check based on actual changes. The check frequency and extent are made dynamic rather than static - when no changes have occurred since the last check, a full check is not performed; when changes are detected, only those specific changes are validated. This dynamic approach enables frequent integrity validation without the resource cost of repeated full checks.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system performs preliminary actions by maintaining a log of changed inodes and metadata since the last check. This log is created and updated continuously during normal file system operations, so that when a check is needed, the preliminary change tracking is already in place, enabling rapid incremental validation without requiring a full re-scan.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8595271B1Systems and methods for performing file system checks

Publication Date: 2013.11.26 ARCTERA US LLC

AI summary

A computer-implemented method for performing file system checks may include identifying a file system to check. The computer-implemented method may also include identifying a base log including file system metadata within the file system at a previous time. The computer-implemented method may further include identifying a set of changed inodes within the file system since the previous time. The computer-implemented method may additionally include creating an updated log based on the base log and the set of changed inodes. The computer-implemented method may also include checking the updated log for consistency. Various other methods, systems, and computer-readable media are also disclosed.