point of contact between pages and buffers?

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Will someone kindly clarify a point regarding memory managment for me?
When a mmap()ed page is modified are it's constituent BUFSIZ parts
then made members of the buffer cache? I ask because a new process that
comes along immediately after the modification before a flush to disk
sees the change via a read(). So there is sharing but I read in the TLK
that data cannot be in both the buffer and page caches!? Where is the point of sharing?

Cheers,

-- 
Chris Quinn
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