fs/jffs2/TODO

   1 $Id: TODO,v 1.18 2005/09/22 11:24:56 dedekind Exp $
   2
   3  - support asynchronous operation -- add a per-fs 'reserved_space' count,
   4    let each outstanding write reserve the _maximum_ amount of physical
   5    space it could take. Let GC flush the outstanding writes because the
   6    reservations will necessarily be pessimistic. With this we could even
   7    do shared writable mmap, if we can have a fs hook for do_wp_page() to
   8    make the reservation.
   9  - disable compression in commit_write()?
  10  - fine-tune the allocation / GC thresholds
  11  - chattr support - turning on/off and tuning compression per-inode
  12  - checkpointing (do we need this? scan is quite fast)
  13  - make the scan code populate real inodes so read_inode just after
  14         mount doesn't have to read the flash twice for large files.
  15         Make this a per-inode option, changable with chattr, so you can
  16         decide which inodes should be in-core immediately after mount.
  17  - test, test, test
  18
  19  - NAND flash support:
  20         - almost done :)
  21         - use bad block check instead of the hardwired byte check
  22
  23  - Optimisations:
  24    - Split writes so they go to two separate blocks rather than just c->nextblock.
  25         By writing _new_ nodes to one block, and garbage-collected REF_PRISTINE
  26         nodes to a different one, we can separate clean nodes from those which
  27         are likely to become dirty, and end up with blocks which are each far
  28         closer to 100% or 0% clean, hence speeding up later GC progress dramatically.
  29    - Stop keeping name in-core with struct jffs2_full_dirent. If we keep the hash in
  30      the full dirent, we only need to go to the flash in lookup() when we think we've
  31      got a match, and in readdir().
  32    - Doubly-linked next_in_ino list to allow us to free obsoleted raw_node_refs immediately?
  33    - Remove totlen from jffs2_raw_node_ref? Need to have totlen passed into
  34         jffs2_mark_node_obsolete(). Can all callers work it out?
  35    - Remove size from jffs2_raw_node_frag.
  36
  37 dedekind:
  38 1. __jffs2_flush_wbuf() has a strange 'pad' parameter. Eliminate.
  39 2. get_sb()->build_fs()->scan() path... Why get_sb() removes scan()'s crap in
  40    case of failure? scan() does not clean everything. Fix.