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$Id: TODO,v 1.3 2001/03/01 23:26:48 dwmw2 Exp $
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$Id: TODO,v 1.17 2004/04/14 20:11:38 gleixner Exp $
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- disable compression in commit_write()? Or at least optimise the 'always write
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- fix zlib. It's ugly as hell and there are at least three copies in the kernel tree
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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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- 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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mount doesn't have to read the flash twice for large files.
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Make this a per-inode option, changable with chattr, so you can
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decide which inodes should be in-core immediately after mount.
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- stop it depending on a block device. mount(8) needs a change for this.
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- make it work on NAND flash. We need to know when we can GC
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deletion dirents, etc. And think about holes/truncation. It can
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all be done reasonably simply, but it need implementing.
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- NAND flash will require new dirent/dnode structures on the medium with
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ECC data in rather than just the CRC we're using ATM.
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- use bad block check instead of the hardwired byte check
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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 totlen from jffs2_raw_node_ref? Need to have totlen passed into
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jffs2_mark_node_obsolete(). Can all callers work it out?
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- Remove size from jffs2_raw_node_frag.
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fs/jffs2/TODO
