| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | $Id: TODO,v 1.10 2002/09/09 16:31:21 dwmw2 Exp $ |
| 2 | |
| 3 | - disable compression in commit_write()? |
| 4 | - fine-tune the allocation / GC thresholds |
| 5 | - chattr support - turning on/off and tuning compression per-inode |
| 6 | - checkpointing (do we need this? scan is quite fast) |
| 7 | - make the scan code populate real inodes so read_inode just after |
| 8 | mount doesn't have to read the flash twice for large files. |
| 9 | Make this a per-inode option, changable with chattr, so you can |
| 10 | decide which inodes should be in-core immediately after mount. |
| 11 | - test, test, test |
| 12 | |
| 13 | - NAND flash support: |
| 14 | - flush_wbuf using GC to fill it, don't just pad. |
| 15 | - Deal with write errors. Data don't get lost - we just have to write |
| 16 | the affected node(s) out again somewhere else. |
| 17 | - make fsync flush only if actually required |
| 18 | - make sys_sync() work. |
| 19 | - reboot notifier |
| 20 | - timed flush of old wbuf |
| 21 | - fix magical second arg of jffs2_flush_wbuf(). Split into two or more functions instead. |
| 22 | |
| 23 | |
| 24 | - Optimisations: |
| 25 | - Stop GC from decompressing and immediately recompressing nodes which could |
| 26 | just be copied intact. (We now keep track of REF_PRISTINE flag. Easy now.) |
| 27 | - Furthermore, in the case where it could be copied intact we don't even need |
| 28 | to call iget() for it -- if we use (raw_node_raw->flash_offset & 2) as a flag |
| 29 | to show a node can be copied intact and it's _not_ in icache, we could just do |
| 30 | it, fix up the next_in_ino list and move on. We would need a way to find out |
| 31 | _whether_ it's in icache though -- if it's in icache we also need to do the |
| 32 | fragment lists, etc. P'raps a flag or pointer in the jffs2_inode_cache could |
| 33 | help. (We have half of this now.) |
| 34 | - Stop keeping name in-core with struct jffs2_full_dirent. If we keep the hash in |
| 35 | the full dirent, we only need to go to the flash in lookup() when we think we've |
| 36 | got a match, and in readdir(). |
| 37 | - Doubly-linked next_in_ino list to allow us to free obsoleted raw_node_refs immediately? |
| 38 | - Remove totlen from jffs2_raw_node_ref? Need to have totlen passed into |
| 39 | jffs2_mark_node_obsolete(). Can all callers work it out? |
| 40 | - Remove size from jffs2_raw_node_frag. |