Re: [GSoC] HAMMER compression and new unionfs
Matthew Dillon <dillon@apollo.backplane.com> writes:
> :src/sys/sys/namecache.h or sys/kern/vfs_cache.c? These are guesses on my
> :part, cause I'm not familiar with it. Matt did a lot of work on the
> :namecache back in 2003/2004; I linked to some of it on the Digest:
> :
> :http://www.shiningsilence.com/dbsdlog/index.php?s=namecache
> :
> :Material there may lead you to more information, I hope.
>
> The unionfs code hasn't worked in years, and I don't think any of
> it is salvageable. Also, the original unionfs code (and probably
> FreeBSD's current code too) depends on whiteouts which HAMMER does
> not support. They never worked very well even in FreeBSD.
>
> A new unionfs would require a complete rewrite from scratch and a
> new approach to recording file deletions.
hm, seems difficult for me.. To have "whiteout database file" on the top
of writable directory, would be another implementation? Then how can I
avoid reading from/writing to the database file?
Regards,
Naohiro
討論串 (同標題文章)
完整討論串 (本文為第 11 之 14 篇)：