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Dear Takashi,

in a conversation with Greg we've concluded that since the struct buf is 
currently in flux and iobuf's are just to be introduced its better to 
implement the nestediobuf's in a less intrusive way.. I'll create a new 
DIFF_BIO patch for that. The other patches don't have to changed.

The B_CALL semantics as cleaning up agent is still broken IMHO. I think 
they really only envisioned async writings whereas its also used for async 
reads.

with regards,
Reinoud

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