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Contents

  • Development process
  • Submitting patches
  • Code of conduct
  • Maintainer handbook
  • All development-process docs
  • Core API
  • Driver APIs
  • Subsystems
    • Core subsystems
    • Human interfaces
    • Networking interfaces
    • Storage interfaces
      • Filesystems in the Linux kernel
      • Block
      • CD-ROM
      • SCSI Subsystem
      • TCM Virtual Device
      • NVMe Subsystem
    • Other subsystems
  • Locking
  • Licensing rules
  • Writing documentation
  • Development tools
  • Testing guide
  • Hacking guide
  • Tracing
  • Fault injection
  • Livepatching
  • Rust
  • Administration
  • Build system
  • Reporting issues
  • Userspace tools
  • Userspace API
  • Firmware
  • Firmware and Devicetree
  • CPU architectures
  • Unsorted documentation
  • Translations

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3. Global Structures¶

The filesystem is sharded into a number of block groups, each of which have static metadata at fixed locations.

  • 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
    • 3.6.9. Fast commits
    • 3.6.10. Fast Commit Replay Idempotence
    • 3.6.11. Journal Checkpoint
  • 3.7. Orphan file
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