From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- fs/jffs2/TODO | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 fs/jffs2/TODO (limited to 'fs/jffs2/TODO') diff --git a/fs/jffs2/TODO b/fs/jffs2/TODO new file mode 100644 index 00000000000..2bff82fd221 --- /dev/null +++ b/fs/jffs2/TODO @@ -0,0 +1,40 @@ +$Id: TODO,v 1.10 2002/09/09 16:31:21 dwmw2 Exp $ + + - disable compression in commit_write()? + - fine-tune the allocation / GC thresholds + - chattr support - turning on/off and tuning compression per-inode + - checkpointing (do we need this? scan is quite fast) + - make the scan code populate real inodes so read_inode just after + mount doesn't have to read the flash twice for large files. + Make this a per-inode option, changable with chattr, so you can + decide which inodes should be in-core immediately after mount. + - test, test, test + + - NAND flash support: + - flush_wbuf using GC to fill it, don't just pad. + - Deal with write errors. Data don't get lost - we just have to write + the affected node(s) out again somewhere else. + - make fsync flush only if actually required + - make sys_sync() work. + - reboot notifier + - timed flush of old wbuf + - fix magical second arg of jffs2_flush_wbuf(). Split into two or more functions instead. + + + - Optimisations: + - Stop GC from decompressing and immediately recompressing nodes which could + just be copied intact. (We now keep track of REF_PRISTINE flag. Easy now.) + - Furthermore, in the case where it could be copied intact we don't even need + to call iget() for it -- if we use (raw_node_raw->flash_offset & 2) as a flag + to show a node can be copied intact and it's _not_ in icache, we could just do + it, fix up the next_in_ino list and move on. We would need a way to find out + _whether_ it's in icache though -- if it's in icache we also need to do the + fragment lists, etc. P'raps a flag or pointer in the jffs2_inode_cache could + help. (We have half of this now.) + - Stop keeping name in-core with struct jffs2_full_dirent. If we keep the hash in + the full dirent, we only need to go to the flash in lookup() when we think we've + got a match, and in readdir(). + - Doubly-linked next_in_ino list to allow us to free obsoleted raw_node_refs immediately? + - Remove totlen from jffs2_raw_node_ref? Need to have totlen passed into + jffs2_mark_node_obsolete(). Can all callers work it out? + - Remove size from jffs2_raw_node_frag. -- cgit v1.2.3