fs/btrfs/TODO

   1 * cleanup, add more error checking, get rid of BUG_ONs
   2 * Fix ENOSPC handling
   3 * Make allocator smarter
   4 * add a block group to struct inode
   5 * Do actual block accounting
   6 * Check compat and incompat flags on the inode
   7 * Get rid of struct ctree_path, limiting tree levels held at one time
   8 * Add generation number to key pointer in nodes
   9 * Add parent pointer back to extent map.
  10 * Release
  11 * Do real tree locking
  12 * Add extent mirroring (backup copies of blocks)
  13 * Add fancy interface to get access to incremental backups
  14 * Add fancy striped extents to make big reads faster
  15 * Use relocation to try and fix write errors
  16 * Make allocator much smarter
  17 * xattrs (directory streams for regular files)
  18 * fsck
  19 * Scrub & defrag
  20