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Diffstat (limited to 'fs/jffs2/TODO')
-rw-r--r-- | fs/jffs2/TODO | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/fs/jffs2/TODO b/fs/jffs2/TODO new file mode 100644 index 000000000000..2bff82fd221f --- /dev/null +++ b/fs/jffs2/TODO | |||
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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. | ||