fs/jffs2/TODO

   1
   2  - support asynchronous operation -- add a per-fs 'reserved_space' count,
   3    let each outstanding write reserve the _maximum_ amount of physical
   4    space it could take. Let GC flush the outstanding writes because the
   5    reservations will necessarily be pessimistic. With this we could even
   6    do shared writable mmap, if we can have a fs hook for do_wp_page() to
   7    make the reservation.
   8  - disable compression in commit_write()?
   9  - fine-tune the allocation / GC thresholds
  10  - chattr support - turning on/off and tuning compression per-inode
  11  - checkpointing (do we need this? scan is quite fast)
  12  - make the scan code populate real inodes so read_inode just after
  13         mount doesn't have to read the flash twice for large files.
  14         Make this a per-inode option, changeable with chattr, so you can
  15         decide which inodes should be in-core immediately after mount.
  16  - test, test, test
  17
  18  - NAND flash support:
  19         - almost done :)
  20         - use bad block check instead of the hardwired byte check
  21
  22  - Optimisations:
  23    - Split writes so they go to two separate blocks rather than just c->nextblock.
  24         By writing _new_ nodes to one block, and garbage-collected REF_PRISTINE
  25         nodes to a different one, we can separate clean nodes from those which
  26         are likely to become dirty, and end up with blocks which are each far
  27         closer to 100% or 0% clean, hence speeding up later GC progress dramatically.
  28    - Stop keeping name in-core with struct jffs2_full_dirent. If we keep the hash in
  29      the full dirent, we only need to go to the flash in lookup() when we think we've
  30      got a match, and in readdir().
  31    - Doubly-linked next_in_ino list to allow us to free obsoleted raw_node_refs immediately?
  32    - Remove size from jffs2_raw_node_frag.
  33
  34 dedekind:
  35 1. __jffs2_flush_wbuf() has a strange 'pad' parameter. Eliminate.
  36 2. get_sb()->build_fs()->scan() path... Why get_sb() removes scan()'s crap in
  37    case of failure? scan() does not clean everything. Fix.