Upcoming feature tracker

[danobi]

List of features in progress and upcoming:

• [x] Support BTRFS_EXTENT_ITEM_KEY item types
  • #2
• [x] Support arbitrary type interpretation
  • #4
• [ ] Support arbitrary type interpretation for extent items
• [ ] Expose a btrfs_search_slot() API in libbtrfsutil
  • #3
• [ ] Add write API
  • #1

Note this list is dependency ordered. ie. the first item doesn't require any dependencies on the lower items.