[GSoC] HAMMER compression and new unionfs
dillon at apollo.backplane.com
Thu Mar 31 10:49:36 PDT 2011
: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:
: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.
<dillon at backplane.com>
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