[GSoC] HAMMER compression and new unionfs
naota at elisp.net
Mon Mar 28 08:53:57 PDT 2011
I'm Naohiro Aota, undergraduate student at Osaka University, Japan.
Last year I've participated GSoC with Gentoo and worked on porting
Gentoo system to DragonFly. Since then I'm so interested in DragnFly
kernel, so I'd like to take part in GSoC with some DragnFly kernel work
this year. I've read the project page and get interested these two
ideas: HAMMER compression and new unionfs. (yes, I like filesystem ;))
I have some question about the ideas.
about HAMMER compression:
- "compression could be turned on a per-file" may support all files
under "/foo" get compressed?
- file size measurement commands, such as "df", "du" and "ls", also need
to change? (actual disk space size and file size may differ if compressed)
about implementing a new unionfs:
> The current unionfs is completely broken as it relies on the whiteout
> VFS technique which is not supported by HAMMER.
- Then main work would be to implement whiteout feature on HAMMER?
- or rewrite unionfs code not to depend on whiteout technique?
- Are there some docs (or some source code file) to help me understand
DragonFly VFS and HAMMER internal?
- Are there some detailed guides about these ideas?
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