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