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, changable with chattr, so you can
15    decide which inodes should be in-core immediately after mount.
16 - test, test, test
18 - NAND flash support:
19    - almost done :)
20    - use bad block check instead of the hardwired byte check
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.
351. __jffs2_flush_wbuf() has a strange 'pad' parameter. Eliminate.
362. get_sb()->build_fs()->scan() path... Why get_sb() removes scan()'s crap in
37   case of failure? scan() does not clean everything. Fix.

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