Write Support

Write Support is to be added in the future in a separate experimental branch (just for the fun). This notes should be a plan on how to add features in a reasonable way, so the order should be relevant. Nevertheless, is not set in stone.

How to proceed

• Get the minimal write support (that is update the superblock as the filesystem expects) without writing to files
  • Minimal testing should include mounting the fs as rw and seeing if fsck runs without problems
• Regular file removal
• Metadata updates
• In place update (meaning, no new block allocated)
• ext2/ext3 style write support (no extents, no multiblock allocator)
  • While first we should implement EXT2/3 Read-Only Support
• ext4 extents
• Journaling
  • EXT4 currently has a “no_journal” mount flag that can be useful
    • Need to check how it behaves with EXT3