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  • ext4 Data Structures and Algorithms
    • 1. About this Book
    • 2. High Level Design
    • 3. Global Structures
    • 4. Dynamic Structures
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ext4 Data Structures and Algorithms¶

  • 1. About this Book
    • 1.1. License
    • 1.2. Terminology
    • 1.3. Other References
  • 2. High Level Design
    • 2.1. Blocks
    • 2.2. Layout
    • 2.3. Flexible Block Groups
    • 2.4. Meta Block Groups
    • 2.5. Lazy Block Group Initialization
    • 2.6. Special inodes
    • 2.7. Block and Inode Allocation Policy
    • 2.8. Checksums
    • 2.9. Bigalloc
    • 2.10. Inline Data
      • 2.10.1. Inline Directories
    • 2.11. Large Extended Attribute Values
  • 3. Global Structures
    • 3.1. Super Block
    • 3.2. Block Group Descriptors
    • 3.3. Block and inode Bitmaps
    • 3.4. Inode Table
    • 3.5. Multiple Mount Protection
    • 3.6. Journal (jbd2)
      • 3.6.1. Layout
      • 3.6.2. External Journal
      • 3.6.3. Block Header
      • 3.6.4. Super Block
      • 3.6.5. Descriptor Block
      • 3.6.6. Data Block
      • 3.6.7. Revocation Block
      • 3.6.8. Commit Block
  • 4. Dynamic Structures
    • 4.1. Index Nodes
      • 4.1.1. Inode Size
      • 4.1.2. Finding an Inode
      • 4.1.3. Inode Timestamps
    • 4.2. The Contents of inode.i_block
      • 4.2.1. Symbolic Links
      • 4.2.2. Direct/Indirect Block Addressing
      • 4.2.3. Extent Tree
      • 4.2.4. Inline Data
    • 4.3. Directory Entries
      • 4.3.1. Linear (Classic) Directories
      • 4.3.2. Hash Tree Directories
    • 4.4. Extended Attributes
      • 4.4.1. Attribute Name Indices
      • 4.4.2. POSIX ACLs
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